<?php
/* For licensing terms, see /license.txt */

use Chamilo\CourseBundle\Entity\CLpCategory;
use ChamiloSession as Session;

/**
 * Class learnpath
 * This class defines the parent attributes and methods for Chamilo learnpaths
 * and SCORM learnpaths. It is used by the scorm class.
 *
 * @package chamilo.learnpath
 * @author	Yannick Warnier <ywarnier@beeznest.org>
 * @author	Julio Montoya   <gugli100@gmail.com> Several improvements and fixes
 */
class learnpath
{
    public $attempt = 0; // The number for the current ID view.
    public $cc; // Course (code) this learnpath is located in. @todo change name for something more comprensible ...
    public $current; // Id of the current item the user is viewing.
    public $current_score; // The score of the current item.
    public $current_time_start; // The time the user loaded this resource (this does not mean he can see it yet).
    public $current_time_stop; // The time the user closed this resource.
    public $default_status = 'not attempted';
    public $encoding = 'UTF-8';
    public $error = '';
    public $extra_information = ''; // This string can be used by proprietary SCORM contents to store data about the current learnpath.
    public $force_commit = false; // For SCORM only - if set to true, will send a scorm LMSCommit() request on each LMSSetValue().
    public $index; // The index of the active learnpath_item in $ordered_items array.
    public $items = array();
    public $last; // item_id of last item viewed in the learning path.
    public $last_item_seen = 0; // In case we have already come in this learnpath, reuse the last item seen if authorized.
    public $license; // Which license this course has been given - not used yet on 20060522.
    public $lp_id; // DB ID for this learnpath.
    public $lp_view_id; // DB ID for lp_view
    public $log_file; // File where to log learnpath API msg.
    public $maker; // Which maker has conceived the content (ENI, Articulate, ...).
    public $message = '';
    public $mode = 'embedded'; // Holds the video display mode (fullscreen or embedded).
    public $name; // Learnpath name (they generally have one).
    public $ordered_items = array(); // List of the learnpath items in the order they are to be read.
    public $path = ''; // Path inside the scorm directory (if scorm).
    public $theme; // The current theme of the learning path.
    public $preview_image; // The current image of the learning path.

    // Tells if all the items of the learnpath can be tried again. Defaults to "no" (=1).
    public $prevent_reinit = 1;

    // Describes the mode of progress bar display.
    public $seriousgame_mode = 0;
    public $progress_bar_mode = '%';

    // Percentage progress as saved in the db.
    public $progress_db = '0';
    public $proximity; // Wether the content is distant or local or unknown.
    public $refs_list = array (); //list of items by ref => db_id. Used only for prerequisites match.
    // !!!This array (refs_list) is built differently depending on the nature of the LP.
    // If SCORM, uses ref, if Chamilo, uses id to keep a unique value.
    public $type; //type of learnpath. Could be 'dokeos', 'scorm', 'scorm2004', 'aicc', ...
    // TODO: Check if this type variable is useful here (instead of just in the controller script).
    public $user_id; //ID of the user that is viewing/using the course
    public $update_queue = array();
    public $scorm_debug = 0;
    public $arrMenu = array(); // Array for the menu items.
    public $debug = 0; // Logging level.
    public $lp_session_id = 0;
    public $lp_view_session_id = 0; // The specific view might be bound to a session.
    public $prerequisite = 0;
    public $use_max_score = 1; // 1 or 0
    public $subscribeUsers = 0; // Subscribe users or not
    public $created_on      = '';
    public $modified_on     = '';
    public $publicated_on   = '';
    public $expired_on      = '';
    public $ref = null;
    public $course_int_id;
    public $course_info = array();
    public $categoryId;

    /**
     * Constructor.
     * Needs a database handler, a course code and a learnpath id from the database.
     * Also builds the list of items into $this->items.
     * @param	string	$course Course code
     * @param	integer	$lp_id
     * @param	integer	$user_id
     * @return mixed True on success, false on error
     */
    public function __construct($course, $lp_id, $user_id)
    {
        $this->encoding = api_get_system_encoding();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::__construct('.$course.','.$lp_id.','.$user_id.')', 0);
        }
        if (empty($course)) {
            $this->error = 'Course code is empty';
            return false;
        } else {
            $course_info = api_get_course_info($course);
            if (!empty($course_info)) {
                $this->cc = $course_info['code'];
                $this->course_info = $course_info;
                $course_id = $course_info['real_id'];
            } else {
                $this->error = 'Course code does not exist in database.';
                return false;
            }
        }

        $this->set_course_int_id($course_id);

        // Check learnpath ID.
        if (empty($lp_id)) {
            $this->error = 'Learnpath ID is empty';
            return false;
        } else {
            // TODO: Make it flexible to use any course_code (still using env course code here).
            $lp_table = Database::get_course_table(TABLE_LP_MAIN);
            $lp_id = intval($lp_id);
            $sql = "SELECT * FROM $lp_table
                    WHERE id = '$lp_id' AND c_id = $course_id";
            if ($this->debug > 2) {
                error_log('New LP - learnpath::__construct() '.__LINE__.' - Querying lp: '.$sql, 0);
            }
            $res = Database::query($sql);

            if (Database::num_rows($res) > 0) {
                $this->lp_id = $lp_id;
                $row = Database::fetch_array($res);
                $this->type = $row['lp_type'];
                $this->name = stripslashes($row['name']);
                $this->proximity = $row['content_local'];
                $this->theme = $row['theme'];
                $this->maker = $row['content_maker'];
                $this->prevent_reinit = $row['prevent_reinit'];
                $this->seriousgame_mode = $row['seriousgame_mode'];
                $this->license = $row['content_license'];
                $this->scorm_debug = $row['debug'];
                $this->js_lib = $row['js_lib'];
                $this->path = $row['path'];
                $this->preview_image = $row['preview_image'];
                $this->author = $row['author'];
                $this->hide_toc_frame = $row['hide_toc_frame'];
                $this->lp_session_id = $row['session_id'];
                $this->use_max_score = $row['use_max_score'];
                $this->subscribeUsers = $row['subscribe_users'];
                $this->created_on = $row['created_on'];
                $this->modified_on = $row['modified_on'];
                $this->ref = $row['ref'];
                $this->categoryId = $row['category_id'];

                if ($row['publicated_on'] != '0000-00-00 00:00:00') {
                    $this->publicated_on = $row['publicated_on'];
                }

                if ($row['expired_on'] != '0000-00-00 00:00:00') {
                    $this->expired_on  = $row['expired_on'];
                }
                if ($this->type == 2) {
                    if ($row['force_commit'] == 1) {
                        $this->force_commit = true;
                    }
                }
                $this->mode = $row['default_view_mod'];
            } else {
                $this->error = 'Learnpath ID does not exist in database ('.$sql.')';

                return false;
            }
        }

        // Check user ID.
        if (empty($user_id)) {
            $this->error = 'User ID is empty';

            return false;
        } else {
            $user_info = api_get_user_info($user_id);
            if (!empty($user_info)) {
                $this->user_id = $user_info['user_id'];
            } else {
                $this->error = 'User ID does not exist in database ('.$sql.')';

                return false;
            }
        }

        // End of variables checking.
        $session_id = api_get_session_id();
        //  Get the session condition for learning paths of the base + session.
        $session = api_get_session_condition($session_id);
        // Now get the latest attempt from this user on this LP, if available, otherwise create a new one.
        $lp_table = Database::get_course_table(TABLE_LP_VIEW);

        // Selecting by view_count descending allows to get the highest view_count first.
        $sql = "SELECT * FROM $lp_table
                WHERE c_id = $course_id AND lp_id = '$lp_id' AND user_id = '$user_id' $session
                ORDER BY view_count DESC";
        $res = Database::query($sql);
        if ($this->debug > 2) {
            error_log('New LP - learnpath::__construct() ' . __LINE__ . ' - querying lp_view: ' . $sql, 0);
        }

        if (Database :: num_rows($res) > 0) {
            if ($this->debug > 2) {
                error_log('New LP - learnpath::__construct() ' . __LINE__ . ' - Found previous view', 0);
            }
            $row = Database :: fetch_array($res);
            $this->attempt = $row['view_count'];
            $this->lp_view_id = $row['id'];
            $this->last_item_seen = $row['last_item'];
            $this->progress_db = $row['progress'];
            $this->lp_view_session_id = $row['session_id'];
        } else if (!api_is_invitee()) {
            if ($this->debug > 2) {
                error_log('New LP - learnpath::__construct() ' . __LINE__ . ' - NOT Found previous view', 0);
            }
            $this->attempt = 1;
            $sql = "INSERT INTO $lp_table (c_id, lp_id, user_id, view_count, session_id)
                    VALUES ($course_id, $lp_id, $user_id, 1, $session_id)";
            Database::query($sql);
            $this->lp_view_id = Database::insert_id();

            if ($this->debug > 2) {
                error_log('New LP - learnpath::__construct() ' . __LINE__ . ' - inserting new lp_view: ' . $sql, 0);
            }

            $sql = "UPDATE $lp_table SET id = iid WHERE iid = ".$this->lp_view_id;
            Database::query($sql);

        }

        // Initialise items.
        $lp_item_table = Database::get_course_table(TABLE_LP_ITEM);
        $sql = "SELECT * FROM $lp_item_table
                WHERE c_id = $course_id AND lp_id = '".$this->lp_id."'
                ORDER BY parent_item_id, display_order";
        $res = Database::query($sql);

        if ($this->debug > 2) {
            error_log('New LP - learnpath::__construct() ' . __LINE__ . ' - query lp items: ' . $sql, 0);
            error_log('-- Start while--', 0);
        }

        $lp_item_id_list = array();

        while ($row = Database::fetch_array($res)) {
            $lp_item_id_list[] = $row['id'];
            switch ($this->type) {
                case 3: //aicc
                    $oItem = new aiccItem('db', $row['id'], $course_id);
                    if (is_object($oItem)) {
                        $my_item_id = $oItem->get_id();
                        $oItem->set_lp_view($this->lp_view_id, $course_id);
                        $oItem->set_prevent_reinit($this->prevent_reinit);
                        // Don't use reference here as the next loop will make the pointed object change.
                        $this->items[$my_item_id] = $oItem;
                        $this->refs_list[$oItem->ref] = $my_item_id;
                        if ($this->debug > 2) {
                            error_log(
                                'New LP - learnpath::__construct() - ' .
                                'aicc object with id ' . $my_item_id .
                                ' set in items[]', 0);
                        }
                    }
                    break;
                case 2:
                    $oItem = new scormItem('db', $row['id'], $course_id);
                    if (is_object($oItem)) {
                        $my_item_id = $oItem->get_id();
                        $oItem->set_lp_view($this->lp_view_id, $course_id);
                        $oItem->set_prevent_reinit($this->prevent_reinit);
                        // Don't use reference here as the next loop will make the pointed object change.

                        $this->items[$my_item_id] = $oItem;

                        $this->refs_list[$oItem->ref] = $my_item_id;
                        if ($this->debug > 2) {
                            error_log('New LP - object with id ' . $my_item_id . ' set in items[]', 0);
                        }
                    }
                    break;
                case 1:
                default:
                    if ($this->debug > 2) {
                        error_log('New LP - learnpath::__construct() ' . __LINE__ . ' - calling learnpathItem', 0);
                    }
                    $oItem = new learnpathItem($row['id'], $user_id, $course_id, $row);

                    if ($this->debug > 2) {
                        error_log('New LP - learnpath::__construct() ' . __LINE__ . ' - end calling learnpathItem', 0);
                    }
                    if (is_object($oItem)) {
                        $my_item_id = $oItem->get_id();
                        //$oItem->set_lp_view($this->lp_view_id); // Moved down to when we are sure the item_view exists.
                        $oItem->set_prevent_reinit($this->prevent_reinit);
                        // Don't use reference here as the next loop will make the pointed object change.
                        $this->items[$my_item_id] = $oItem;
                        $this->refs_list[$my_item_id] = $my_item_id;
                        if ($this->debug > 2) {
                            error_log(
                                'New LP - learnpath::__construct() ' . __LINE__ .
                                ' - object with id ' . $my_item_id . ' set in items[]',
                                0);
                        }
                    }
                    break;
            }

            // Setting the object level with variable $this->items[$i][parent]
            foreach ($this->items as $itemLPObject) {
                $level = learnpath::get_level_for_item($this->items, $itemLPObject->db_id);
                $itemLPObject->level = $level;
            }

            // Setting the view in the item object.
            if (is_object($this->items[$row['id']])) {
                $this->items[$row['id']]->set_lp_view($this->lp_view_id, $course_id);
                if ($this->items[$row['id']]->get_type() == TOOL_HOTPOTATOES) {
                    $this->items[$row['id']]->current_start_time = 0;
                    $this->items[$row['id']]->current_stop_time	= 0;
                }
            }
        }

        if ($this->debug > 2) {
            error_log('New LP - learnpath::__construct() ' . __LINE__ . ' ----- end while ----', 0);
        }

        if (!empty($lp_item_id_list)) {
            $lp_item_id_list_to_string = implode("','", $lp_item_id_list);
            if (!empty($lp_item_id_list_to_string)) {
                // Get last viewing vars.
                $lp_item_view_table = Database:: get_course_table(
                    TABLE_LP_ITEM_VIEW
                );
                // This query should only return one or zero result.
                $sql = "SELECT lp_item_id, status
                        FROM $lp_item_view_table
                        WHERE
                            c_id = $course_id AND
                            lp_view_id = ".$this->lp_view_id." AND
                            lp_item_id IN ('".$lp_item_id_list_to_string."')
                        ORDER BY view_count DESC ";

                if ($this->debug > 2) {
                    error_log(
                        'New LP - learnpath::__construct() - Selecting item_views: '.$sql,
                        0
                    );
                }

                $status_list = array();
                $res = Database::query($sql);
                while ($row = Database:: fetch_array($res)) {
                    $status_list[$row['lp_item_id']] = $row['status'];
                }

                foreach ($lp_item_id_list as $item_id) {
                    if (isset($status_list[$item_id])) {
                        $status = $status_list[$item_id];
                        if (is_object($this->items[$item_id])) {
                            $this->items[$item_id]->set_status($status);
                            if (empty($status)) {
                                $this->items[$item_id]->set_status(
                                    $this->default_status
                                );
                            }
                        }
                    } else {
                        if (!api_is_invitee()) {
                            if (is_object($this->items[$item_id])) {
                                $this->items[$item_id]->set_status(
                                    $this->default_status
                                );
                            }

                            // Add that row to the lp_item_view table so that we have something to show in the stats page.
                            $sql = "INSERT INTO $lp_item_view_table (c_id, lp_item_id, lp_view_id, view_count, status)
                                    VALUES ($course_id, ".$item_id.",".$this->lp_view_id.", 1, 'not attempted')";

                            if ($this->debug > 2) {
                                error_log(
                                    'New LP - learnpath::__construct() '.__LINE__.' - Inserting blank item_view : '.$sql_ins,
                                    0
                                );
                            }
                            $this->items[$item_id]->set_lp_view(
                                $this->lp_view_id,
                                $course_id
                            );

                            Database::query($sql);
                            $insertId = Database::insert_id();

                            $sql = "UPDATE $lp_item_view_table SET id = iid
                                    WHERE iid = $insertId";
                            Database::query($sql);
                        }
                    }
                }
            }
        }

        $this->ordered_items = self::get_flat_ordered_items_list(
            $this->get_id(),
            0,
            $course_id
        );
        $this->max_ordered_items = 0;
        foreach ($this->ordered_items as $index => $dummy) {
            if ($index > $this->max_ordered_items && !empty($dummy)) {
                $this->max_ordered_items = $index;
            }
        }
        // TODO: Define the current item better.
        $this->first();
        if ($this->debug > 2) {
            error_log('New LP - learnpath::__construct() ' . __LINE__ . ' - End of learnpath constructor for learnpath ' . $this->get_id(), 0);
        }
        return true;
    }

    /**
     * @return string
     */
    public function getCourseCode()
    {
        return $this->cc;
    }

    /**
     * @return int
     */
    public function get_course_int_id()
    {
        return isset($this->course_int_id) ? $this->course_int_id : api_get_course_int_id();
    }

    /**
     * @param $course_id
     * @return int
     */
    public function set_course_int_id($course_id)
    {
        return $this->course_int_id = intval($course_id);
    }

    /**
     * Get the depth level of LP item
     * @param $in_tab_items
     * @param $in_current_item_id
     * @return int
     */
    private static function get_level_for_item($in_tab_items, $in_current_item_id)
    {
        $parent_item_id = $in_tab_items[$in_current_item_id]->parent;
        if ($parent_item_id == 0) {
            return 0;
        } else {
            return learnpath::get_level_for_item($in_tab_items, $parent_item_id) + 1;
        }
    }

    /**
     * Function rewritten based on old_add_item() from Yannick Warnier.
     * Due the fact that users can decide where the item should come, I had to overlook this function and
     * I found it better to rewrite it. Old function is still available.
     * Added also the possibility to add a description.
     *
     * @param int $parent
     * @param int $previous
     * @param string $type
     * @param int  resource ID (ref)
     * @param string $title
     * @param string $description
     * @param int $prerequisites
     * @param int $max_time_allowed
     * @return int
     */
    public function add_item(
        $parent,
        $previous,
        $type = 'dokeos_chapter',
        $id,
        $title,
        $description,
        $prerequisites = 0,
        $max_time_allowed = 0
    ) {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::add_item(' . $parent . ',' . $previous . ',' . $type . ',' . $id . ',' . $title . ')', 0);
        }
        $tbl_lp_item = Database :: get_course_table(TABLE_LP_ITEM);
        $_course = api_get_course_info();
        $parent = intval($parent);
        $previous = intval($previous);
        $id = intval($id);
        $max_time_allowed = htmlentities($max_time_allowed);
        if (empty($max_time_allowed)) {
            $max_time_allowed = 0;
        }
        $sql = "SELECT COUNT(id) AS num
                FROM $tbl_lp_item
                WHERE
                    c_id = $course_id AND
                    lp_id = " . $this->get_id() . " AND
                    parent_item_id = " . $parent;

        $res_count = Database::query($sql);
        $row = Database :: fetch_array($res_count);
        $num = $row['num'];

        if ($num > 0) {
            if ($previous == 0) {
                $sql = "SELECT id, next_item_id, display_order
                        FROM " . $tbl_lp_item . "
                        WHERE
                            c_id = $course_id AND
                            lp_id = " . $this->get_id() . " AND
                            parent_item_id = " . $parent . " AND
                            previous_item_id = 0 OR
                            previous_item_id=" . $parent;
                $result = Database::query($sql);
                $row = Database :: fetch_array($result);

                $tmp_previous = 0;
                $next = $row['id'];
                $display_order = 0;
            } else {
                $previous = (int) $previous;
                $sql = "SELECT id, previous_item_id, next_item_id, display_order
						FROM $tbl_lp_item
                        WHERE
                            c_id = $course_id AND
                            lp_id = " . $this->get_id() . " AND
                            id = " . $previous;

                $result = Database::query($sql);
                $row = Database:: fetch_array($result);

                $tmp_previous = $row['id'];
                $next = $row['next_item_id'];
                $display_order = $row['display_order'];
            }
        } else {
            $tmp_previous = 0;
            $next = 0;
            $display_order = 0;
        }

        $id = intval($id);
        $typeCleaned = Database::escape_string($type);
        if ($type == 'quiz') {
            $sql = 'SELECT SUM(ponderation)
                    FROM ' . Database :: get_course_table(TABLE_QUIZ_QUESTION) . ' as quiz_question
                    INNER JOIN  ' . Database :: get_course_table(TABLE_QUIZ_TEST_QUESTION) . ' as quiz_rel_question
                    ON
                        quiz_question.id = quiz_rel_question.question_id AND
                        quiz_question.c_id = quiz_rel_question.c_id
                    WHERE
                        quiz_rel_question.exercice_id = '.$id." AND
                        quiz_question.c_id = $course_id AND
                        quiz_rel_question.c_id = $course_id ";
            $rsQuiz = Database::query($sql);
            $max_score = Database :: result($rsQuiz, 0, 0);

            // Disabling the exercise if we add it inside a LP
            $exercise = new Exercise();
            $exercise->read($id);
            $exercise->disable();
            $exercise->save();
        } else {
            $max_score = 100;
        }

        $params = array(
            "c_id" => $course_id,
            "lp_id" => $this->get_id(),
            "item_type" =>$typeCleaned ,
            "ref" => '',
            "title" =>$title ,
            "description" => $description,
            "path" => $id,
            "max_score" => $max_score,
            "parent_item_id" => $parent,
            "previous_item_id" => $previous,
            "next_item_id" => $next,
            "display_order" => $display_order +1,
            "prerequisite" => $prerequisites,
            "max_time_allowed" => $max_time_allowed
        );

        if ($prerequisites != 0) {
            $params['prerequisite'] = $prerequisites;
        }

        $new_item_id = Database::insert($tbl_lp_item, $params);

        if ($this->debug > 2) {
            error_log('New LP - Inserting chapter: ' . $new_item_id, 0);
        }

        if ($new_item_id) {

            $sql = "UPDATE $tbl_lp_item SET id = iid WHERE iid = $new_item_id";
            Database::query($sql);

            // Update the item that should come after the new item.
            $sql = " UPDATE $tbl_lp_item SET
                        previous_item_id =  $new_item_id,
                        next_item_id = $new_item_id,
                        id = $new_item_id
                     WHERE iid = $new_item_id";
            Database::query($sql);

            // Update all the items after the new item.
            $sql = "UPDATE " . $tbl_lp_item . "
                        SET display_order = display_order + 1
                    WHERE
                        c_id = $course_id AND
                        lp_id = " . $this->get_id() . " AND
                        id <> " . $new_item_id . " AND
                        parent_item_id = " . $parent . " AND
                        display_order > " . $display_order;
            Database::query($sql);

            // Update the item that should come after the new item.
            $sql = "UPDATE " . $tbl_lp_item . "
                    SET ref = " . $new_item_id . "
                    WHERE c_id = $course_id AND id = " . $new_item_id;
            Database::query($sql);

            // Upload audio.
            if (!empty($_FILES['mp3']['name'])) {
                // Create the audio folder if it does not exist yet.
                $filepath = api_get_path(SYS_COURSE_PATH) . $_course['path'] . '/document/';
                if (!is_dir($filepath . 'audio')) {
                    mkdir($filepath . 'audio', api_get_permissions_for_new_directories());
                    $audio_id = add_document(
                        $_course,
                        '/audio',
                        'folder',
                        0,
                        'audio'
                    );
                    api_item_property_update(
                        $_course,
                        TOOL_DOCUMENT,
                        $audio_id,
                        'FolderCreated',
                        api_get_user_id(),
                        null,
                        null,
                        null,
                        null,
                        api_get_session_id()
                    );
                    api_item_property_update(
                        $_course,
                        TOOL_DOCUMENT,
                        $audio_id,
                        'invisible',
                        api_get_user_id(),
                        null,
                        null,
                        null,
                        null,
                        api_get_session_id()
                    );
                }

                $file_path = handle_uploaded_document(
                    $_course,
                    $_FILES['mp3'],
                    api_get_path(SYS_COURSE_PATH) . $_course['path'] . '/document',
                    '/audio',
                    api_get_user_id(),
                    '',
                    '',
                    '',
                    '',
                    false
                );

                // Getting the filename only.
                $file_components = explode('/', $file_path);
                $file = $file_components[count($file_components) - 1];

                // Store the mp3 file in the lp_item table.
                $sql = "UPDATE $tbl_lp_item SET
                            audio = '" . Database::escape_string($file) . "'
                        WHERE id = '" . intval($new_item_id) . "'";
                Database::query($sql);
            }
        }

        return $new_item_id;
    }

    /**
     * Static admin function allowing addition of a learnpath to a course.
     * @param	string	Course code
     * @param	string	Learnpath name
     * @param	string	Learnpath description string, if provided
     * @param	string	Type of learnpath (default = 'guess', others = 'dokeos', 'aicc',...)
     * @param	string	Type of files origin (default = 'zip', others = 'dir','web_dir',...)
     * @param	string	Zip file containing the learnpath or directory containing the learnpath
     * @return	integer	The new learnpath ID on success, 0 on failure
     */
    public static function add_lp(
        $course,
        $name,
        $description = '',
        $learnpath = 'guess',
        $origin = 'zip',
        $zipname = '',
        $publicated_on = '',
        $expired_on = '',
        $categoryId = 0
    ) {
        global $charset;
        $course_id = api_get_course_int_id();
        $tbl_lp = Database :: get_course_table(TABLE_LP_MAIN);
        // Check course code exists.
        // Check lp_name doesn't exist, otherwise append something.
        $i = 0;
        $name = Database::escape_string($name);
        $categoryId = intval($categoryId);

        // Session id.
        $session_id = api_get_session_id();

        $check_name = "SELECT * FROM $tbl_lp WHERE c_id = $course_id AND name = '$name'";
        //if ($this->debug > 2) { error_log('New LP - Checking the name for new LP: '.$check_name, 0); }
        $res_name = Database::query($check_name);

        if ($publicated_on == '0000-00-00 00:00:00' || empty($publicated_on)) {
            //by default the publication date is the same that the creation date
            //The behaviour above was changed due BT#2800
            global $_custom;
            if (isset($_custom['lps_hidden_when_no_start_date']) && $_custom['lps_hidden_when_no_start_date']) {
                $publicated_on = '';
            } else {
                $publicated_on = api_get_utc_datetime();
            }
        } else {
            $publicated_on = Database::escape_string(api_get_utc_datetime($publicated_on));
        }

        if ($expired_on == '0000-00-00 00:00:00' || empty($expired_on)) {
            $expired_on = '';
        } else {
            $expired_on = Database::escape_string(api_get_utc_datetime($expired_on));
        }

        while (Database :: num_rows($res_name)) {
            // There is already one such name, update the current one a bit.
            $i++;
            $name = $name . ' - ' . $i;
            $check_name = "SELECT * FROM $tbl_lp WHERE c_id = $course_id AND name = '$name'";
            $res_name = Database::query($check_name);
        }
        // New name does not exist yet; keep it.
        // Escape description.
        // Kevin: added htmlentities().
        $description = Database::escape_string(api_htmlentities($description, ENT_QUOTES, $charset));
        $type = 1;
        switch ($learnpath) {
            case 'guess':
                break;
            case 'dokeos':
            case 'chamilo':
                $type = 1;
                break;
            case 'aicc':
                break;
        }

        switch ($origin) {
            case 'zip':
                // Check zip name string. If empty, we are currently creating a new Chamilo learnpath.
                break;
            case 'manual':
            default:
                $get_max = "SELECT MAX(display_order) FROM $tbl_lp WHERE c_id = $course_id";
                $res_max = Database::query($get_max);
                if (Database :: num_rows($res_max) < 1) {
                    $dsp = 1;
                } else {
                    $row = Database :: fetch_array($res_max);
                    $dsp = $row[0] + 1;
                }

                $params = [
                    'c_id' => $course_id,
                    'lp_type' => $type,
                    'name' => $name,
                    'description' => $description,
                    'path' => '',
                    'default_view_mod' => 'embedded',
                    'default_encoding' => 'UTF-8',
                    'display_order' => $dsp,
                    'content_maker' => 'Chamilo',
                    'content_local' => 'local',
                    'js_lib' => '',
                    'session_id' => $session_id,
                    'created_on' => api_get_utc_datetime(),
                    'publicated_on' => $publicated_on,
                    'expired_on' => $expired_on,
                    'category_id' => $categoryId
                ];

                $id = Database::insert($tbl_lp, $params);

                if ($id > 0) {
                    $sql = "UPDATE $tbl_lp SET id = iid WHERE iid = $id";
                    Database::query($sql);

                    $course_info = api_get_course_info();
                    // Insert into item_property.
                    api_item_property_update(
                        $course_info,
                        TOOL_LEARNPATH,
                        $id,
                        'LearnpathAdded',
                        api_get_user_id()
                    );
                    api_set_default_visibility($id, TOOL_LEARNPATH);
                    return $id;
                }
                break;
        }
    }

    /**
     * Appends a message to the message attribute
     * @param	string	$string Message to append.
     */
    public function append_message($string)
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::append_message()', 0);
        }
        $this->message .= $string;
    }

    /**
     * Auto completes the parents of an item in case it's been completed or passed
     * @param	integer	$item Optional ID of the item from which to look for parents
     */
    public function autocomplete_parents($item)
    {
        $debug = $this->debug;

        if ($debug) {
            error_log('Learnpath::autocomplete_parents()', 0);
        }

        if (empty($item)) {
            $item = $this->current;
        }

        $currentItem = $this->getItem($item);
        if ($currentItem) {
            $parent_id = $currentItem->get_parent();
            $parent = $this->getItem($parent_id);
            if ($parent) {
                // if $item points to an object and there is a parent.
                if ($debug) {
                    error_log(
                        'Autocompleting parent of item ' . $item . ' "'.$currentItem->get_title().'" (item ' . $parent_id . ' "'.$parent->get_title().'") ',
                        0
                    );
                }

                // New experiment including failed and browsed in completed status.
                //$current_status = $currentItem->get_status();
                //if ($currentItem->is_done() || $current_status == 'browsed' || $current_status == 'failed') {
                // Fixes chapter auto complete
                if (true) {
                    // If the current item is completed or passes or succeeded.
                    $updateParentStatus = true;
                    if ($debug) {
                        error_log('Status of current item is alright', 0);
                    }

                    foreach ($parent->get_children() as $childItemId) {
                        $childItem = $this->getItem($childItemId);

                        // If children was not set try to get the info
                        if (empty($childItem->db_item_view_id)) {
                            $childItem->set_lp_view($this->lp_view_id, $this->course_int_id);
                        }

                        // Check all his brothers (parent's children) for completion status.
                        if ($childItemId != $item) {
                            if ($debug) {
                                error_log(
                                    'Looking at brother #'.$childItemId . ' "' . $childItem->get_title() . '", status is ' . $childItem->get_status(),
                                    0
                                );
                            }
                            // Trying completing parents of failed and browsed items as well.
                            if ($childItem->status_is(
                                array(
                                    'completed',
                                    'passed',
                                    'succeeded',
                                    'browsed',
                                    'failed'
                                )
                            )
                            ) {
                                // Keep completion status to true.
                                continue;
                            } else {
                                if ($debug > 2) {
                                    error_log(
                                        'Found one incomplete child of parent #' . $parent_id . ': child #'.$childItemId . ' "' . $childItem->get_title() . '", is ' . $childItem->get_status().' db_item_view_id:#'.$childItem->db_item_view_id,
                                        0
                                    );
                                }
                                $updateParentStatus = false;
                                break;
                            }
                        }
                    }

                    if ($updateParentStatus) {
                        // If all the children were completed:
                        $parent->set_status('completed');
                        $parent->save(false, $this->prerequisites_match($parent->get_id()));
                        // Force the status to "completed"
                        //$this->update_queue[$parent->get_id()] = $parent->get_status();
                        $this->update_queue[$parent->get_id()] = 'completed';
                        if ($debug) {
                            error_log(
                                'Added parent #'.$parent->get_id().' "'.$parent->get_title().'" to update queue status: completed '.
                                print_r($this->update_queue, 1),
                                0
                            );
                        }
                        // Recursive call.
                        $this->autocomplete_parents($parent->get_id());
                    }
                }
            } else {
                if ($debug) {
                    error_log("Parent #$parent_id does not exists");
                }
            }
        } else {
            if ($debug) {
                error_log("#$item is an item that doesn't have parents");
            }
        }
    }

    /**
     * Auto saves the current results into the database for the whole learnpath
     */
    public function autosave()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::autosave()', 0);
        }
        // TODO: Add save operations for the learnpath itself.
    }

    /**
     * Clears the message attribute
     */
    public function clear_message()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::clear_message()', 0);
        }
        $this->message = '';
    }

    /**
     * Closes the current resource
     *
     * Stops the timer
     * Saves into the database if required
     * Clears the current resource data from this object
     * @return	boolean	True on success, false on failure
     */
    public function close()
    {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::close()', 0);
        }
        if (empty ($this->lp_id)) {
            $this->error = 'Trying to close this learnpath but no ID is set';
            return false;
        }
        $this->current_time_stop = time();
        $this->ordered_items = array();
        $this->index = 0;
        unset ($this->lp_id);
        //unset other stuff
        return true;
    }

    /**
     * Static admin function allowing removal of a learnpath
     * @param	string	Course code
     * @param	integer	Learnpath ID
     * @param	string	Whether to delete data or keep it (default: 'keep', others: 'remove')
     * @return	boolean	True on success, false on failure (might change that to return number of elements deleted)
     */
    public function delete($course = null, $id = null, $delete = 'keep')
    {
        $course_id = api_get_course_int_id();

        // TODO: Implement a way of getting this to work when the current object is not set.
        // In clear: implement this in the item class as well (abstract class) and use the given ID in queries.
        // If an ID is specifically given and the current LP is not the same, prevent delete.
        if (!empty ($id) && ($id != $this->lp_id)) {
            return false;
        }

        $lp = Database:: get_course_table(TABLE_LP_MAIN);
        $lp_item = Database:: get_course_table(TABLE_LP_ITEM);
        $lp_view = Database:: get_course_table(TABLE_LP_VIEW);
        $lp_item_view = Database:: get_course_table(TABLE_LP_ITEM_VIEW);

        // Delete lp item id.
        foreach ($this->items as $id => $dummy) {
            $sql = "DELETE FROM $lp_item_view WHERE c_id = $course_id AND lp_item_id = '" . $id . "'";
            Database::query($sql);
        }

        // Proposed by Christophe (nickname: clefevre)
        $sql = "DELETE FROM $lp_item WHERE c_id = ".$course_id." AND lp_id = " . $this->lp_id;
        Database::query($sql);

        $sql = "DELETE FROM $lp_view WHERE c_id = ".$course_id." AND lp_id = " . $this->lp_id;
        Database::query($sql);

        self::toggle_publish($this->lp_id, 'i');

        if ($this->type == 2 || $this->type == 3) {
            // This is a scorm learning path, delete the files as well.
            $sql = "SELECT path FROM $lp WHERE c_id = ".$course_id." AND id = " . $this->lp_id;
            $res = Database::query($sql);
            if (Database :: num_rows($res) > 0) {
                $row = Database :: fetch_array($res);
                $path = $row['path'];
                $sql = "SELECT id FROM $lp WHERE c_id = ".$course_id." AND path = '$path' AND id != " . $this->lp_id;
                $res = Database::query($sql);
                if (Database :: num_rows($res) > 0) { // Another learning path uses this directory, so don't delete it.
                    if ($this->debug > 2) {
                        error_log('New LP - In learnpath::delete(), found other LP using path ' . $path . ', keeping directory', 0);
                    }
                } else {
                    // No other LP uses that directory, delete it.
                    $course_rel_dir = api_get_course_path() . '/scorm/'; // scorm dir web path starting from /courses
                    $course_scorm_dir = api_get_path(SYS_COURSE_PATH) . $course_rel_dir; // The absolute system path for this course.
                    if ($delete == 'remove' && is_dir($course_scorm_dir . $path) and !empty ($course_scorm_dir)) {
                        if ($this->debug > 2) {
                            error_log('New LP - In learnpath::delete(), found SCORM, deleting directory: ' . $course_scorm_dir . $path, 0);
                        }
                        // Proposed by Christophe (clefevre).
                        if (strcmp(substr($path, -2), "/.") == 0) {
                            $path = substr($path, 0, -1); // Remove "." at the end.
                        }
                        //exec('rm -rf ' . $course_scorm_dir . $path); // See Bug #5208, this is not OS-portable way.
                        rmdirr($course_scorm_dir . $path);
                    }
                }
            }
        }

        $tbl_tool = Database :: get_course_table(TABLE_TOOL_LIST);
        $link = 'newscorm/lp_controller.php?action=view&lp_id='.$this->lp_id;
        // Delete tools
        $sql = "DELETE FROM $tbl_tool WHERE c_id = ".$course_id." AND (link LIKE '$link%' AND image='scormbuilder.gif')";
        Database::query($sql);

        $sql = "DELETE FROM $lp WHERE c_id = ".$course_id." AND id = " . $this->lp_id;
        Database::query($sql);
        // Updates the display order of all lps.
        $this->update_display_order();

        api_item_property_update(
            api_get_course_info(),
            TOOL_LEARNPATH,
            $this->lp_id,
            'delete',
            api_get_user_id()
        );

        // Delete link of gradebook tool
        //$tbl_grade_link = Database :: get_main_table(TABLE_MAIN_GRADEBOOK_LINK);
        /*$sql = 'SELECT gl.id FROM ' . $tbl_grade_link . ' gl WHERE gl.type="4" AND gl.ref_id="' . $id . '";';
        $result = Database::query($sql);
        $row = Database :: fetch_array($result, 'ASSOC');*/

        // Fixing gradebook link deleted see #5229.
        /*
        if (!empty($row['id'])) {
               $link = LinkFactory :: load($row['id']);
            if ($link[0] != null) {
                   $link[0]->delete();
            }
        }*/
        $link_info = GradebookUtils::is_resource_in_course_gradebook(api_get_course_id(), 4 , $id, api_get_session_id());
        if ($link_info !== false) {
            GradebookUtils::remove_resource_from_course_gradebook($link_info['id']);
        }

        if (api_get_setting('search_enabled') == 'true') {
            require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';
            delete_all_values_for_item($this->cc, TOOL_LEARNPATH, $this->lp_id);
        }
    }

    /**
     * Removes all the children of one item - dangerous!
     * @param	integer	$id Element ID of which children have to be removed
     * @return	integer	Total number of children removed
     */
    public function delete_children_items($id)
    {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::delete_children_items(' . $id . ')', 0);
        }
        $num = 0;
        if (empty ($id) || $id != strval(intval($id))) {
            return false;
        }
        $lp_item = Database :: get_course_table(TABLE_LP_ITEM);
        $sql = "SELECT * FROM $lp_item WHERE c_id = ".$course_id." AND parent_item_id = $id";
        $res = Database::query($sql);
        while ($row = Database :: fetch_array($res)) {
            $num += $this->delete_children_items($row['id']);
            $sql_del = "DELETE FROM $lp_item WHERE c_id = ".$course_id." AND id = " . $row['id'];
            Database::query($sql_del);
            $num++;
        }
        return $num;
    }

    /**
     * Removes an item from the current learnpath
     * @param	integer	$id Elem ID (0 if first)
     * @param	integer	$remove Whether to remove the resource/data from the
     * system or leave it (default: 'keep', others 'remove')
     * @return	integer	Number of elements moved
     * @todo implement resource removal
     */
    public function delete_item($id, $remove = 'keep')
    {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::delete_item()', 0);
        }
        // TODO: Implement the resource removal.
        if (empty ($id) || $id != strval(intval($id))) {
            return false;
        }
        // First select item to get previous, next, and display order.
        $lp_item = Database :: get_course_table(TABLE_LP_ITEM);
        $sql_sel = "SELECT * FROM $lp_item WHERE c_id = ".$course_id." AND id = $id";
        $res_sel = Database::query($sql_sel);
        if (Database :: num_rows($res_sel) < 1) {
            return false;
        }
        $row = Database :: fetch_array($res_sel);
        $previous = $row['previous_item_id'];
        $next = $row['next_item_id'];
        $display = $row['display_order'];
        $parent = $row['parent_item_id'];
        $lp = $row['lp_id'];
        // Delete children items.
        $num = $this->delete_children_items($id);
        if ($this->debug > 2) {
            error_log('New LP - learnpath::delete_item() - deleted ' . $num . ' children of element ' . $id, 0);
        }
        // Now delete the item.
        $sql_del = "DELETE FROM $lp_item WHERE c_id = $course_id AND id = $id";
        if ($this->debug > 2) {
            error_log('New LP - Deleting item: ' . $sql_del, 0);
        }
        Database::query($sql_del);
        // Now update surrounding items.
        $sql_upd = "UPDATE $lp_item SET next_item_id = $next
                    WHERE c_id = ".$course_id." AND id = $previous";
        Database::query($sql_upd);
        $sql_upd = "UPDATE $lp_item SET previous_item_id = $previous
                    WHERE c_id = ".$course_id." AND id = $next";
        Database::query($sql_upd);
        // Now update all following items with new display order.
        $sql_all = "UPDATE $lp_item SET display_order = display_order-1
                    WHERE c_id = ".$course_id." AND lp_id = $lp AND parent_item_id = $parent AND display_order > $display";
        Database::query($sql_all);

        //Removing prerequisites since the item will not longer exist
        $sql_all = "UPDATE $lp_item SET prerequisite = '' WHERE c_id = ".$course_id." AND prerequisite = $id";
        Database::query($sql_all);

        // Remove from search engine if enabled.
        if (api_get_setting('search_enabled') == 'true') {
            $tbl_se_ref = Database :: get_main_table(TABLE_MAIN_SEARCH_ENGINE_REF);
            $sql = 'SELECT * FROM %s WHERE course_code=\'%s\' AND tool_id=\'%s\' AND ref_id_high_level=%s AND ref_id_second_level=%d LIMIT 1';
            $sql = sprintf($sql, $tbl_se_ref, $this->cc, TOOL_LEARNPATH, $lp, $id);
            $res = Database::query($sql);
            if (Database :: num_rows($res) > 0) {
                $row2 = Database :: fetch_array($res);
                require_once api_get_path(LIBRARY_PATH).'search/ChamiloIndexer.class.php';
                $di = new ChamiloIndexer();
                $di->remove_document((int) $row2['search_did']);
            }
            $sql = 'DELETE FROM %s WHERE course_code=\'%s\' AND tool_id=\'%s\' AND ref_id_high_level=%s AND ref_id_second_level=%d LIMIT 1';
            $sql = sprintf($sql, $tbl_se_ref, $this->cc, TOOL_LEARNPATH, $lp, $id);
            Database::query($sql);
        }
    }

    /**
     * Updates an item's content in place
     * @param   integer $id Element ID
     * @param   integer $parent Parent item ID
     * @param   integer $previous Previous item ID
     * @param   string  $title Item title
     * @param   string  $description Item description
     * @param   string  $prerequisites Prerequisites (optional)
     * @param   array   $audio The array resulting of the $_FILES[mp3] element
     * @param   int     $max_time_allowed
     * @param   string  $url
     * @return  boolean True on success, false on error
     */
    public function edit_item(
        $id,
        $parent,
        $previous,
        $title,
        $description,
        $prerequisites = '0',
        $audio = array(),
        $max_time_allowed = 0,
        $url = ''
    ) {
        $course_id = api_get_course_int_id();
        $_course = api_get_course_info();

        if ($this->debug > 0) {
            error_log('New LP - In learnpath::edit_item()', 0);
        }
        if (empty ($max_time_allowed)) {
            $max_time_allowed = 0;
        }
        if (empty ($id) || ($id != strval(intval($id))) || empty ($title)) {
            return false;
        }

        $tbl_lp_item = Database :: get_course_table(TABLE_LP_ITEM);
        $sql_select = "SELECT * FROM " . $tbl_lp_item . " WHERE c_id = ".$course_id." AND id = " . $id;
        $res_select = Database::query($sql_select);
        $row_select = Database :: fetch_array($res_select);
        $audio_update_sql = '';
        if (is_array($audio) && !empty ($audio['tmp_name']) && $audio['error'] === 0) {
            // Create the audio folder if it does not exist yet.
            $filepath = api_get_path(SYS_COURSE_PATH) . $_course['path'] . '/document/';
            if (!is_dir($filepath . 'audio')) {
                mkdir($filepath . 'audio', api_get_permissions_for_new_directories());
                $audio_id = add_document(
                    $_course,
                    '/audio',
                    'folder',
                    0,
                    'audio'
                );
                api_item_property_update(
                    $_course,
                    TOOL_DOCUMENT,
                    $audio_id,
                    'FolderCreated',
                    api_get_user_id(),
                    null,
                    null,
                    null,
                    null,
                    api_get_session_id()
                );
                api_item_property_update(
                    $_course,
                    TOOL_DOCUMENT,
                    $audio_id,
                    'invisible',
                    api_get_user_id(),
                    null,
                    null,
                    null,
                    null,
                    api_get_session_id()
                );
            }

            // Upload file in documents.
            $pi = pathinfo($audio['name']);
            if ($pi['extension'] == 'mp3') {
                $c_det = api_get_course_info($this->cc);
                $bp = api_get_path(SYS_COURSE_PATH) . $c_det['path'] . '/document';
                $path = handle_uploaded_document($c_det, $audio, $bp, '/audio', api_get_user_id(), 0, null, 0, 'rename', false, 0);
                $path = substr($path, 7);
                // Update reference in lp_item - audio path is the path from inside de document/audio/ dir.
                $audio_update_sql = ", audio = '" . Database::escape_string($path) . "' ";
            }
        }

        $same_parent = ($row_select['parent_item_id'] == $parent) ? true : false;
        $same_previous = ($row_select['previous_item_id'] == $previous) ? true : false;

        // TODO: htmlspecialchars to be checked for encoding related problems.
        if ($same_parent && $same_previous) {
            // Only update title and description.
            $sql = "UPDATE " . $tbl_lp_item . "
                    SET title = '" . Database::escape_string($title) . "',
                        prerequisite = '" . $prerequisites . "',
                        description = '" . Database::escape_string($description) . "'
                        " . $audio_update_sql . ",
                        max_time_allowed = '" . Database::escape_string($max_time_allowed) . "'
                    WHERE c_id = ".$course_id." AND id = " . $id;
            Database::query($sql);
        } else {
            $old_parent = $row_select['parent_item_id'];
            $old_previous = $row_select['previous_item_id'];
            $old_next = $row_select['next_item_id'];
            $old_order = $row_select['display_order'];
            $old_prerequisite = $row_select['prerequisite'];
            $old_max_time_allowed = $row_select['max_time_allowed'];

            /* BEGIN -- virtually remove the current item id */
            /* for the next and previous item it is like the current item doesn't exist anymore */

            if ($old_previous != 0) {
                // Next
                $sql = "UPDATE " . $tbl_lp_item . "
                        SET next_item_id = " . $old_next . "
                        WHERE c_id = ".$course_id." AND id = " . $old_previous;
                Database::query($sql);
            }

            if ($old_next != 0) {
                // Previous
                $sql = "UPDATE " . $tbl_lp_item . "
                        SET previous_item_id = " . $old_previous . "
                        WHERE c_id = ".$course_id." AND id = " . $old_next;
                Database::query($sql);
            }

            // display_order - 1 for every item with a display_order bigger then the display_order of the current item.
            $sql = "UPDATE " . $tbl_lp_item . "
                    SET display_order = display_order - 1
                    WHERE
                        c_id = ".$course_id." AND
                        display_order > " . $old_order . " AND
                        lp_id = " . $this->lp_id . " AND
                        parent_item_id = " . $old_parent;
            Database::query($sql);
            /* END -- virtually remove the current item id */

            /* BEGIN -- update the current item id to his new location */

            if ($previous == 0) {
                // Select the data of the item that should come after the current item.
                $sql = "SELECT id, display_order
                        FROM " . $tbl_lp_item . "
                        WHERE
                            c_id = ".$course_id." AND
                            lp_id = " . $this->lp_id . " AND
                            parent_item_id = " . $parent . " AND
                            previous_item_id = " . $previous;
                $res_select_old = Database::query($sql);
                $row_select_old = Database::fetch_array($res_select_old);

                // If the new parent didn't have children before.
                if (Database :: num_rows($res_select_old) == 0) {
                    $new_next = 0;
                    $new_order = 1;
                } else {
                    $new_next = $row_select_old['id'];
                    $new_order = $row_select_old['display_order'];
                }
            } else {
                // Select the data of the item that should come before the current item.
                $sql = "SELECT next_item_id, display_order
                        FROM " . $tbl_lp_item . "
                        WHERE c_id = ".$course_id." AND id = " . $previous;
                $res_select_old = Database::query($sql);
                $row_select_old = Database :: fetch_array($res_select_old);
                $new_next = $row_select_old['next_item_id'];
                $new_order = $row_select_old['display_order'] + 1;
            }

            // TODO: htmlspecialchars to be checked for encoding related problems.
            // Update the current item with the new data.
            $sql = "UPDATE " . $tbl_lp_item . "
                    SET
                        title = '" . Database::escape_string($title) . "',
                        description = '" . Database::escape_string($description) . "',
                        parent_item_id = " . $parent . ",
                        previous_item_id = " . $previous . ",
                        next_item_id = " . $new_next . ",
                        display_order = " . $new_order . "
                        " . $audio_update_sql . "
                    WHERE c_id = ".$course_id." AND id = " . $id;
            Database::query($sql);

            if ($previous != 0) {
                // Update the previous item's next_item_id.
                $sql = "UPDATE " . $tbl_lp_item . "
                        SET next_item_id = " . $id . "
                        WHERE c_id = ".$course_id." AND id = " . $previous;
                Database::query($sql);
            }

            if ($new_next != 0) {
                // Update the next item's previous_item_id.
                $sql = "UPDATE " . $tbl_lp_item . "
                        SET previous_item_id = " . $id . "
                        WHERE c_id = ".$course_id." AND id = " . $new_next;
                Database::query($sql);
            }

            if ($old_prerequisite != $prerequisites) {
                $sql = "UPDATE " . $tbl_lp_item . "
                        SET prerequisite = '" . $prerequisites . "'
                        WHERE c_id = ".$course_id." AND id = " . $id;
                Database::query($sql);
            }

            if ($old_max_time_allowed != $max_time_allowed) {
                // update max time allowed
                $sql = "UPDATE " . $tbl_lp_item . "
                        SET max_time_allowed = " . $max_time_allowed . "
                        WHERE c_id = ".$course_id." AND id = " . $id;
                Database::query($sql);
            }

            // Update all the items with the same or a bigger display_order than the current item.
            $sql = "UPDATE " . $tbl_lp_item . "
                    SET display_order = display_order + 1
                    WHERE
                       c_id = ".$course_id." AND
                       lp_id = " . $this->get_id() . " AND
                       id <> " . $id . " AND
                       parent_item_id = " . $parent . " AND
                       display_order >= " . $new_order;

            Database::query($sql);
        }

        if ($row_select['item_type'] == 'link') {
            $link = new Link();
            $linkId = $row_select['path'];
            $link->updateLink($linkId, $url);
        }
    }

    /**
     * Updates an item's prereq in place
     * @param	integer	$id Element ID
     * @param	string	$prerequisite_id Prerequisite Element ID
     * @param	int 	$mastery_score Prerequisite min score
     * @param	int 	$max_score Prerequisite max score
     *
     * @return	boolean	True on success, false on error
     */
    public function edit_item_prereq($id, $prerequisite_id, $mastery_score = 0, $max_score = 100)
    {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::edit_item_prereq(' . $id . ',' . $prerequisite_id . ',' . $mastery_score . ',' . $max_score . ')', 0);
        }

        if (empty($id) || ($id != strval(intval($id))) || empty ($prerequisite_id)) {
            return false;
        }

        $prerequisite_id = intval($prerequisite_id);
        $tbl_lp_item = Database :: get_course_table(TABLE_LP_ITEM);

        if (!is_numeric($mastery_score) || $mastery_score < 0) {
            $mastery_score = 0;
        }

        if (!is_numeric($max_score) || $max_score < 0) {
            $max_score = 100;
        }

        /*if ($mastery_score > $max_score) {
            $max_score = $mastery_score;
        }*/

        if (!is_numeric($prerequisite_id)) {
            $prerequisite_id = 'NULL';
        }

        $mastery_score = floatval($mastery_score);
        $max_score = floatval($max_score);

        $sql = " UPDATE $tbl_lp_item
                 SET
                    prerequisite = $prerequisite_id ,
                    prerequisite_min_score = $mastery_score ,
                    prerequisite_max_score = $max_score
                 WHERE c_id = $course_id AND id = $id";
        Database::query($sql);

        if ($prerequisite_id != 'NULL' && $prerequisite_id != '') {
            // Will this be enough to ensure unicity?
            /*$sql = " UPDATE $tbl_lp_item
                     SET mastery_score = $mastery_score
                     WHERE c_id = $course_id AND ref = '$prerequisite_id'";

            Database::query($sql);*/
        }
        // TODO: Update the item object (can be ignored for now because refreshed).
        return true;
    }

    /**
     * Escapes a string with the available database escape function
     * @param	string	String to escape
     * @return	string	String escaped
     * @deprecated use  Database::escape_string
     */
    public function escape_string($string)
    {
        return Database::escape_string($string);
    }

    /**
     * Static admin function exporting a learnpath into a zip file
     * @param	string	Export type (scorm, zip, cd)
     * @param	string	Course code
     * @param	integer Learnpath ID
     * @param	string	Zip file name
     * @return	string	Zip file path (or false on error)
     */
    public function export_lp($type, $course, $id, $zipname)
    {
        if (empty($type) || empty($course) || empty($id) || empty($zipname)) {
            return false;
        }
        $url = '';
        switch ($type) {
            case 'scorm':
                break;
            case 'zip':
                break;
            case 'cdrom':
                break;
        }
        return $url;
    }

    /**
     * Gets all the chapters belonging to the same parent as the item/chapter given
     * Can also be called as abstract method
     * @param	integer	Item ID
     * @return	array	A list of all the "brother items" (or an empty array on failure)
     */
    public function get_brother_chapters($id)
    {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_brother_chapters()', 0);
        }

        if (empty($id)|| $id != strval(intval($id))) {
            return array ();
        }

        $lp_item = Database :: get_course_table(TABLE_LP_ITEM);
        $sql_parent = "SELECT * FROM $lp_item
                       WHERE c_id = ".$course_id." AND id = $id AND item_type='dokeos_chapter'";
        $res_parent = Database::query($sql_parent);
        if (Database :: num_rows($res_parent) > 0) {
            $row_parent = Database :: fetch_array($res_parent);
            $parent = $row_parent['parent_item_id'];
            $sql_bros = "SELECT * FROM $lp_item
            WHERE
                c_id = ".$course_id." AND
                parent_item_id = $parent AND
                id = $id AND
                item_type='dokeos_chapter'
            ORDER BY display_order";
            $res_bros = Database::query($sql_bros);
            $list = array ();
            while ($row_bro = Database :: fetch_array($res_bros)) {
                $list[] = $row_bro;
            }
            return $list;
        }
        return array ();
    }

    /**
     * Gets all the items belonging to the same parent as the item given
     * Can also be called as abstract method
     * @param	integer	Item ID
     * @return	array	A list of all the "brother items" (or an empty array on failure)
     */
    public function get_brother_items($id) {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_brother_items(' . $id . ')', 0);
        }

        if (empty ($id) || $id != strval(intval($id))) {
            return array ();
        }

        $lp_item = Database :: get_course_table(TABLE_LP_ITEM);
        $sql_parent = "SELECT * FROM $lp_item WHERE c_id = $course_id AND id = $id";
        $res_parent = Database::query($sql_parent);
        if (Database :: num_rows($res_parent) > 0) {
            $row_parent = Database :: fetch_array($res_parent);
            $parent = $row_parent['parent_item_id'];
            $sql_bros = "SELECT * FROM $lp_item WHERE c_id = ".$course_id." AND parent_item_id = $parent
                         ORDER BY display_order";
            $res_bros = Database::query($sql_bros);
            $list = array ();
            while ($row_bro = Database :: fetch_array($res_bros)) {
                $list[] = $row_bro;
            }
            return $list;
        }
        return array ();
    }

    /**
     * Get the specific prefix index terms of this learning path
     * @param string $prefix
     * @return  array Array of terms
     */
    public function get_common_index_terms_by_prefix($prefix)
    {
        require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';
        $terms = get_specific_field_values_list_by_prefix(
            $prefix,
            $this->cc,
            TOOL_LEARNPATH,
            $this->lp_id
        );
        $prefix_terms = array();
        if (!empty($terms)) {
            foreach ($terms as $term) {
                $prefix_terms[] = $term['value'];
            }
        }
        return $prefix_terms;
    }

    /**
     * Gets the number of items currently completed
     * @return integer The number of items currently completed
     */
    public function get_complete_items_count()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_complete_items_count()', 0);
        }
        $i = 0;
        $completedStatusList = array(
            'completed',
            'passed',
            'succeeded',
            'browsed',
            'failed'
        );

        foreach ($this->items as $id => $dummy) {
            // Trying failed and browsed considered "progressed" as well.
            if ($this->items[$id]->status_is($completedStatusList) &&
                $this->items[$id]->get_type() != 'dokeos_chapter' &&
                $this->items[$id]->get_type() != 'dir'
            ) {
                $i++;
            }
        }
        return $i;
    }

    /**
     * Gets the current item ID
     * @return	integer	The current learnpath item id
     */
    public function get_current_item_id()
    {
        $current = 0;
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_current_item_id()', 0);
        }
        if (!empty($this->current)) {
            $current = $this->current;
        }
        if ($this->debug > 2) {
            error_log('New LP - In learnpath::get_current_item_id() - Returning ' . $current, 0);
        }
        return $current;
    }

    /**
     * Force to get the first learnpath item id
     * @return	integer	The current learnpath item id
     */
    public function get_first_item_id()
    {
        $current = 0;
        if (is_array($this->ordered_items)) {
            $current = $this->ordered_items[0];
        }
        return $current;
    }

    /**
     * Gets the total number of items available for viewing in this SCORM
     * @return	integer	The total number of items
     */
    public function get_total_items_count()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_total_items_count()', 0);
        }
        return count($this->items);
    }

    /**
     * Gets the total number of items available for viewing in this SCORM but without chapters
     * @return	integer	The total no-chapters number of items
     */
    public function get_total_items_count_without_chapters()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_total_items_count_without_chapters()', 0);
        }
        $total = 0;
        $typeListNotToCount = self::getChapterTypes();
        foreach ($this->items as $temp2) {
            if (!in_array($temp2->get_type(), $typeListNotToCount)) {
                $total++;
            }
        }
        return $total;
    }

    /**
     * Gets the first element URL.
     * @return	string	URL to load into the viewer
     */
    public function first()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::first()', 0);
            error_log('$this->last_item_seen '.$this->last_item_seen);
        }

        // Test if the last_item_seen exists and is not a dir.
        if (count($this->ordered_items) == 0) {
            $this->index = 0;
        }

        if ($this->debug > 0) {
            if (isset($this->items[$this->last_item_seen])) {
                $status = $this->items[$this->last_item_seen]->get_status();
            }
            error_log('status '.$status);
        }

        if (!empty($this->last_item_seen) &&
            !empty($this->items[$this->last_item_seen]) &&
            $this->items[$this->last_item_seen]->get_type() != 'dir' &&
            $this->items[$this->last_item_seen]->get_type() != 'dokeos_chapter'
            //with this change (below) the LP will NOT go to the next item, it will take lp item we left
            //&& !$this->items[$this->last_item_seen]->is_done()
        ) {

            if ($this->debug > 2) {
                error_log('New LP - In learnpath::first() - Last item seen is ' . $this->last_item_seen.' of type '.$this->items[$this->last_item_seen]->get_type(), 0);
            }
            $index = -1;
            foreach ($this->ordered_items as $myindex => $item_id) {
                if ($item_id == $this->last_item_seen) {
                    $index = $myindex;
                    break;
                }
            }
            if ($index == -1) {
                // Index hasn't changed, so item not found - panic (this shouldn't happen).
                if ($this->debug > 2) {
                    error_log('New LP - Last item (' . $this->last_item_seen . ') was found in items but not in ordered_items, panic!', 0);
                }
                return false;
            } else {
                $this->last     = $this->last_item_seen;
                $this->current  = $this->last_item_seen;
                $this->index    = $index;
            }
        } else {
            if ($this->debug > 2) {
                error_log('New LP - In learnpath::first() - No last item seen', 0);
            }
            $index = 0;
            // Loop through all ordered items and stop at the first item that is
            // not a directory *and* that has not been completed yet.
            while ( !empty($this->ordered_items[$index]) AND
                is_a($this->items[$this->ordered_items[$index]], 'learnpathItem') AND
                (
                    $this->items[$this->ordered_items[$index]]->get_type() == 'dir' OR
                    $this->items[$this->ordered_items[$index]]->get_type() == 'dokeos_chapter' OR
                    $this->items[$this->ordered_items[$index]]->is_done() === true
                ) AND $index < $this->max_ordered_items) {
                $index++;
            }
            $this->last     = $this->current;
            // current is
            $this->current  = isset($this->ordered_items[$index]) ? $this->ordered_items[$index] : null;
            $this->index    = $index;
            if ($this->debug > 2) {
                error_log('$index ' . $index);
            }
            if ($this->debug > 2) {
                error_log('New LP - In learnpath::first() - No last item seen. New last = ' . $this->last . '(' . $this->ordered_items[$index] . ')', 0);
            }
        }
        if ($this->debug > 2) {
            error_log('New LP - In learnpath::first() - First item is ' . $this->get_current_item_id());
        }
    }

    /**
     * Gets the information about an item in a format usable as JavaScript to update
     * the JS API by just printing this content into the <head> section of the message frame
     * @param	int $item_id
     * @return	string
     */
    public function get_js_info($item_id = '')
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_js_info(' . $item_id . ')', 0);
        }

        $info = '';
        $item_id = intval($item_id);

        if (!empty($item_id) && is_object($this->items[$item_id])) {
            //if item is defined, return values from DB
            $oItem = $this->items[$item_id];
            $info .= '<script language="javascript">';
            $info .= "top.set_score(" . $oItem->get_score() . ");\n";
            $info .= "top.set_max(" . $oItem->get_max() . ");\n";
            $info .= "top.set_min(" . $oItem->get_min() . ");\n";
            $info .= "top.set_lesson_status('" . $oItem->get_status() . "');";
            $info .= "top.set_session_time('" . $oItem->get_scorm_time('js') . "');";
            $info .= "top.set_suspend_data('" . $oItem->get_suspend_data() . "');";
            $info .= "top.set_saved_lesson_status('" . $oItem->get_status() . "');";
            $info .= "top.set_flag_synchronized();";
            $info .= '</script>';
            if ($this->debug > 2) {
                error_log('New LP - in learnpath::get_js_info(' . $item_id . ') - returning: ' . $info, 0);
            }
            return $info;

        } else {

            // If item_id is empty, just update to default SCORM data.
            $info .= '<script language="javascript">';
            $info .= "top.set_score(" . learnpathItem :: get_score() . ");\n";
            $info .= "top.set_max(" . learnpathItem :: get_max() . ");\n";
            $info .= "top.set_min(" . learnpathItem :: get_min() . ");\n";
            $info .= "top.set_lesson_status('" . learnpathItem :: get_status() . "');";
            $info .= "top.set_session_time('" . learnpathItem :: getScormTimeFromParameter('js') . "');";
            $info .= "top.set_suspend_data('" . learnpathItem :: get_suspend_data() . "');";
            $info .= "top.set_saved_lesson_status('" . learnpathItem :: get_status() . "');";
            $info .= "top.set_flag_synchronized();";
            $info .= '</script>';
            if ($this->debug > 2) {
                error_log('New LP - in learnpath::get_js_info(' . $item_id . ') - returning: ' . $info, 0);
            }
            return $info;
        }
    }

    /**
     * Gets the js library from the database
     * @return	string	The name of the javascript library to be used
     */
    public function get_js_lib()
    {
        $lib = '';
        if (!empty ($this->js_lib)) {
            $lib = $this->js_lib;
        }
        return $lib;
    }

    /**
     * Gets the learnpath database ID
     * @return	integer	Learnpath ID in the lp table
     */
    public function get_id()
    {
        if (!empty ($this->lp_id)) {
            return $this->lp_id;
        } else {
            return 0;
        }
    }

    /**
     * Gets the last element URL.
     * @return string URL to load into the viewer
     */
    public function get_last()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_last()', 0);
        }
        $this->index = count($this->ordered_items) - 1;
        return $this->ordered_items[$this->index];
    }

    /**
     * Gets the navigation bar for the learnpath display screen
     * @return	string	The HTML string to use as a navigation bar
     */
    public function get_navigation_bar($idBar = null, $display=null) {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_navigation_bar()', 0);
        }
        if(empty($idBar)){
            $idBar='control-top';
        }
        if(empty($display)){
            $display='display:block';
        }
        $navbar = null;
        $lp_id = $this->lp_id;
        $mycurrentitemid = $this->get_current_item_id();

        if ($this->mode == 'fullscreen') {
            $navbar = '
                  <div id="'.$idBar.'" class="buttons well" style="'.$display.'">
                    <a href="lp_controller.php?action=stats&'.api_get_cidreq(true).'&lp_id='.$lp_id.'" onClick="window.parent.API.save_asset();return true;" target="content_name_blank" title="stats" id="stats_link"><img border="0" src="../img/btn_stats.png" title="' . get_lang('Reporting') . '"></a>
                    <a id="scorm-previous" href="" onClick="switch_item(' . $mycurrentitemid . ',\'previous\');return false;" title="previous"><img border="0" src="../img/btn_previous.png" title="' . get_lang('ScormPrevious') . '"></a>
                    <a id="scorm-next" href="" onClick="switch_item(' . $mycurrentitemid . ',\'next\');return false;" title="next"  ><img border="0" src="../img/btn_next.png" title="' . get_lang('ScormNext') . '"></a>.
                    <a href="lp_controller.php?action=mode&mode=embedded" target="_top" title="embedded mode"><img border="0" src="../img/view_choose.gif" title="'.get_lang('ScormExitFullScreen').'"></a>
                  </div>';

        } else {
            $navbar = '
                  <div id="'.$idBar.'" class="buttons well" style="'.$display.'">
                    <a href="lp_controller.php?action=stats&'.api_get_cidreq(true).'&lp_id='.$lp_id.'" onClick="window.parent.API.save_asset();return true;" target="content_name" title="stats" id="stats_link"><img border="0" src="../img/btn_stats.png" title="' . get_lang('Reporting') . '"></a>
                    <a id="scorm-previous" href="" onClick="switch_item(' . $mycurrentitemid . ',\'previous\');return false;" title="previous"><img border="0" src="../img/btn_previous.png" title="' . get_lang('ScormPrevious') . '"></a>
                    <a id="scorm-next" href="" onClick="switch_item(' . $mycurrentitemid . ',\'next\');return false;" title="next"  ><img border="0" src="../img/btn_next.png" title="' . get_lang('ScormNext') . '"></a>
                  </div>';
        }
        return $navbar;
    }

    /**
     * Gets the next resource in queue (url).
     * @return	string	URL to load into the viewer
     */
    public function get_next_index()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_next_index()', 0);
        }
        // TODO
        $index = $this->index;
        $index++;
        if ($this->debug > 2) {
            error_log('New LP - Now looking at ordered_items[' . ($index) . '] - type is ' . $this->items[$this->ordered_items[$index]]->type, 0);
        }
        while (!empty ($this->ordered_items[$index]) AND ($this->items[$this->ordered_items[$index]]->get_type() == 'dir' || $this->items[$this->ordered_items[$index]]->get_type() == 'dokeos_chapter') AND $index < $this->max_ordered_items) {
            $index++;
            if ($index == $this->max_ordered_items){
                if ($this->items[$this->ordered_items[$index]]->get_type() == 'dir' || $this->items[$this->ordered_items[$index]]->get_type() == 'dokeos_chapter') {
                    return $this->index;
                } else {
                    return $index;
                }
            }
        }
        if (empty ($this->ordered_items[$index])) {
            return $this->index;
        }
        if ($this->debug > 2) {
            error_log('New LP - index is now ' . $index, 0);
        }
        return $index;
    }

    /**
     * Gets item_id for the next element
     * @return	integer	Next item (DB) ID
     */
    public function get_next_item_id()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_next_item_id()', 0);
        }
        $new_index = $this->get_next_index();
        if (!empty ($new_index)) {
            if (isset ($this->ordered_items[$new_index])) {
                if ($this->debug > 2) {
                    error_log('New LP - In learnpath::get_next_index() - Returning ' . $this->ordered_items[$new_index], 0);
                }
                return $this->ordered_items[$new_index];
            }
        }
        if ($this->debug > 2) {
            error_log('New LP - In learnpath::get_next_index() - Problem - Returning 0', 0);
        }
        return 0;
    }

    /**
     * Returns the package type ('scorm','aicc','scorm2004','dokeos','ppt'...)
     *
     * Generally, the package provided is in the form of a zip file, so the function
     * has been written to test a zip file. If not a zip, the function will return the
     * default return value: ''
     * @param	string	the path to the file
     * @param	string 	the original name of the file
     * @return	string	'scorm','aicc','scorm2004','dokeos' or '' if the package cannot be recognized
     */
    public static function get_package_type($file_path, $file_name)
    {
        // Get name of the zip file without the extension.
        $file_info = pathinfo($file_name);
        $filename = $file_info['basename']; // Name including extension.
        $extension = $file_info['extension']; // Extension only.

        if (!empty($_POST['ppt2lp']) && !in_array(strtolower($extension), array(
                'dll',
                'exe'
            ))) {
            return 'oogie';
        }
        if (!empty($_POST['woogie']) && !in_array(strtolower($extension), array(
                'dll',
                'exe'
            ))) {
            return 'woogie';
        }

        // Filename without its extension.
        $file_base_name = str_replace('.' . $extension, '', $filename);

        $zipFile = new PclZip($file_path);
        // Check the zip content (real size and file extension).
        $zipContentArray = $zipFile->listContent();
        $package_type = '';
        $at_root = false;
        $manifest = '';
        $aicc_match_crs = 0;
        $aicc_match_au = 0;
        $aicc_match_des = 0;
        $aicc_match_cst = 0;

        // The following loop should be stopped as soon as we found the right imsmanifest.xml (how to recognize it?).
        if (is_array($zipContentArray) && count($zipContentArray) > 0) {
            foreach ($zipContentArray as $thisContent) {
                if (preg_match('~.(php.*|phtml)$~i', $thisContent['filename'])) {
                    // New behaviour: Don't do anything. These files will be removed in scorm::import_package.
                } elseif (stristr($thisContent['filename'], 'imsmanifest.xml') !== false) {
                    $manifest = $thisContent['filename']; // Just the relative directory inside scorm/
                    $package_type = 'scorm';
                    break; // Exit the foreach loop.
                } elseif (
                    preg_match('/aicc\//i', $thisContent['filename']) ||
                    in_array(strtolower(pathinfo($thisContent['filename'], PATHINFO_EXTENSION)), array( 'crs','au','des','cst'))
                ) {
                    $ext = strtolower(pathinfo($thisContent['filename'], PATHINFO_EXTENSION));
                    switch ($ext) {
                        case 'crs':
                            $aicc_match_crs = 1;
                            break;
                        case 'au':
                            $aicc_match_au = 1;
                            break;
                        case 'des':
                            $aicc_match_des = 1;
                            break;
                        case 'cst':
                            $aicc_match_cst = 1;
                            break;
                        default:
                            break;
                    }
                    //break; // Don't exit the loop, because if we find an imsmanifest afterwards, we want it, not the AICC.
                } else {
                    $package_type = '';
                }
            }
        }
        if (empty($package_type) && 4 == ($aicc_match_crs + $aicc_match_au + $aicc_match_des + $aicc_match_cst)) {
            // If found an aicc directory... (!= false means it cannot be false (error) or 0 (no match)).
            $package_type = 'aicc';
        }
        return $package_type;
    }

    /**
     * Gets the previous resource in queue (url). Also initialises time values for this viewing
     * @return string URL to load into the viewer
     */
    public function get_previous_index()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_previous_index()', 0);
        }
        $index = $this->index;
        if (isset ($this->ordered_items[$index -1])) {
            $index--;
            while (isset($this->ordered_items[$index]) AND ($this->items[$this->ordered_items[$index]]->get_type() == 'dir' || $this->items[$this->ordered_items[$index]]->get_type() == 'dokeos_chapter')) {
                $index--;
                if ($index < 0) {
                    return $this->index;
                }
            }
        } else {
            if ($this->debug > 2) {
                error_log('New LP - get_previous_index() - there was no previous index available, reusing ' . $index, 0);
            }
            // There is no previous item.
        }
        return $index;
    }

    /**
     * Gets item_id for the next element
     * @return	integer	Previous item (DB) ID
     */
    public function get_previous_item_id()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_previous_item_id()', 0);
        }
        $new_index = $this->get_previous_index();
        return $this->ordered_items[$new_index];
    }

    /**
     * Gets the progress value from the progress_db attribute
     * @return	integer	Current progress value
     */
    public function get_progress()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_progress()', 0);
        }
        if (!empty ($this->progress_db)) {
            return $this->progress_db;
        }
        return 0;
    }

    /**
     * Returns the HTML necessary to print a mediaplayer block inside a page
     * @return string	The mediaplayer HTML
     */
    public function get_mediaplayer($autostart = 'true')
    {
        $course_id = api_get_course_int_id();
        $_course = api_get_course_info();
        $tbl_lp_item 		= Database :: get_course_table(TABLE_LP_ITEM);
        $tbl_lp_item_view 	= Database :: get_course_table(TABLE_LP_ITEM_VIEW);

        // Getting all the information about the item.
        $sql = "SELECT * FROM ".$tbl_lp_item." as lp
                INNER JOIN ".$tbl_lp_item_view." as lp_view
                ON lp.id = lp_view.lp_item_id
                WHERE
                    lp.id = '".$_SESSION['oLP']->current."' AND
                    lp.c_id = $course_id AND
                    lp_view.c_id = $course_id";
        $result = Database::query($sql);
        $row 	= Database::fetch_assoc($result);
        $output = '';

        if (!empty ($row['audio'])) {

            $list = $_SESSION['oLP']->get_toc();
            $type_quiz = false;

            foreach($list as $toc) {
                if ($toc['id'] == $_SESSION['oLP']->current && ($toc['type']=='quiz') ) {
                    $type_quiz = true;
                }
            }

            if ($type_quiz) {
                if ($_SESSION['oLP']->prevent_reinit == 1) {
                    $row['status'] === 'completed' ? $autostart_audio = 'false' : $autostart_audio = 'true';
                } else {
                    $autostart_audio = $autostart;
                }
            } else {
                $autostart_audio = 'true';
            }

            $courseInfo = api_get_course_info();

            $audio = $row['audio'];

            $file = api_get_path(SYS_COURSE_PATH).$courseInfo['path'].'/document/audio/'.$audio;
            $url = api_get_path(WEB_COURSE_PATH).$courseInfo['path'].'/document/audio/'.$audio.'?'.api_get_cidreq();

            if (!file_exists($file)) {
                $lpPathInfo = $_SESSION['oLP']->generate_lp_folder(api_get_course_info());
                $file = api_get_path(SYS_COURSE_PATH).$_course['path'].'/document'.$lpPathInfo['dir'].$audio;
                $url = api_get_path(WEB_COURSE_PATH).$_course['path'].'/document'.$lpPathInfo['dir'].$audio.'?'.api_get_cidreq();
            }

            $player = Display::getMediaPlayer(
                $file,
                array(
                    'id' => 'lp_audio_media_player',
                    'url' => $url,
                    'autoplay' => $autostart_audio,
                    'width' => '100%'
                )
            );

            // The mp3 player.
            $output  = '<div id="container">';
            $output .= $player;
            $output .= '</div>';
        }

        return $output;
    }

    /**
     * Checks if the learning path is visible for student after the progress
     * of its prerequisite is completed, considering the time availability and
     * the LP visibility.
     * @param int $lp_id
     * @param int $student_id
     * @param string Course code (optional)
     * @param int $sessionId
     * @return	bool
     */
    public static function is_lp_visible_for_student(
        $lp_id,
        $student_id,
        $courseCode = null,
        $sessionId = null
    ) {
        $lp_id = (int)$lp_id;
        $courseInfo = api_get_course_info($courseCode);
        $sessionId = intval($sessionId);

        if (empty($sessionId)) {
            $sessionId = api_get_session_id();
        }

        $tbl_learnpath = Database::get_course_table(TABLE_LP_MAIN);
        // Get current prerequisite
        $sql = "SELECT id, prerequisite, subscribe_users, publicated_on, expired_on
                FROM $tbl_learnpath
                WHERE c_id = ".$courseInfo['real_id']." AND id = $lp_id";

        $itemInfo = api_get_item_property_info(
            $courseInfo['real_id'],
            TOOL_LEARNPATH,
            $lp_id,
            $sessionId
        );

        // If the item was deleted.
        if (isset($itemInfo['visibility']) && $itemInfo['visibility'] == 2) {
            return false;
        }

        $rs  = Database::query($sql);
        $now = time();
        if (Database::num_rows($rs) > 0) {
            $row = Database::fetch_array($rs, 'ASSOC');

            $prerequisite = $row['prerequisite'];
            $is_visible = true;

            if (!empty($prerequisite)) {
                $progress = self::getProgress(
                    $prerequisite,
                    $student_id,
                    $courseInfo['real_id'],
                    $sessionId
                );
                $progress = intval($progress);
                if ($progress < 100) {
                    $is_visible = false;
                }
            }

            // Also check the time availability of the LP
            if ($is_visible) {
                // Adding visibility restrictions
                if (!empty($row['publicated_on']) &&
                    $row['publicated_on'] != '0000-00-00 00:00:00'
                ) {
                    if ($now < api_strtotime($row['publicated_on'], 'UTC')) {
                        //api_not_allowed();
                        $is_visible = false;
                    }
                }

                // Blocking empty start times see BT#2800
                global $_custom;
                if (isset($_custom['lps_hidden_when_no_start_date']) &&
                    $_custom['lps_hidden_when_no_start_date']
                ) {
                    if (empty($row['publicated_on']) || $row['publicated_on'] == '0000-00-00 00:00:00') {
                        //api_not_allowed();
                        $is_visible = false;
                    }
                }

                if (!empty($row['expired_on']) && $row['expired_on'] != '0000-00-00 00:00:00') {
                    if ($now > api_strtotime($row['expired_on'], 'UTC')) {
                        //api_not_allowed();
                        $is_visible = false;
                    }
                }
            }

            // Check if the subscription users/group to a LP is ON
            if (isset($row['subscribe_users']) && $row['subscribe_users'] == 1) {
                // Try group
                $is_visible = false;

                // Checking only the user visibility
                $userVisibility = api_get_item_visibility(
                    $courseInfo,
                    'learnpath',
                    $row['id'],
                    $sessionId,
                    $student_id,
                    'LearnpathSubscription'
                );

                if ($userVisibility == 1) {
                    $is_visible = true;
                } else {
                    $userGroups = GroupManager::getAllGroupPerUserSubscription($student_id);
                    if (!empty($userGroups)) {
                        foreach ($userGroups as $groupInfo) {
                            $groupId = $groupInfo['iid'];

                            $userVisibility = api_get_item_visibility(
                                $courseInfo,
                                'learnpath',
                                $row['id'],
                                $sessionId,
                                null,
                                'LearnpathSubscription',
                                $groupId
                            );

                            if ($userVisibility == 1) {
                                $is_visible = true;
                                break;
                            }
                        }
                    }
                }
            }

            return $is_visible;
        }

        return false;
    }

    /**
     * @param int $lpId
     * @param int $userId
     * @param int $courseId
     * @param int $sessionId
     * @return int
     */
    public static function getProgress($lpId, $userId, $courseId, $sessionId = 0)
    {
        $lpId = intval($lpId);
        $userId = intval($userId);
        $courseId = intval($courseId);
        $sessionId = intval($sessionId);
        $progress = 0;

        $sessionCondition = api_get_session_condition($sessionId);
        $table = Database :: get_course_table(TABLE_LP_VIEW);
        $sql = "SELECT * FROM $table
                WHERE
                    c_id = ".$courseId." AND
                    lp_id = $lpId AND
                    user_id = $userId $sessionCondition";
        $res = Database::query($sql);
        if (Database :: num_rows($res) > 0) {
            $row = Database:: fetch_array($res);
            $progress = $row['progress'];
        }
        return $progress;

    }

    /**
     * Displays a progress bar
     * completed so far.
     * @param	integer	$percentage Progress value to display
     * @param	string	$text_add Text to display near the progress value
     * @return	string	HTML string containing the progress bar
     */
    public static function get_progress_bar($percentage = -1, $text_add = '')
    {
        $text = $percentage . $text_add;
        $output = '<div class="progress">
                        <div id="progress_bar_value" class="progress-bar" role="progressbar" aria-valuenow="' .$percentage. '" aria-valuemin="0" aria-valuemax="100" style="width: '.$text.';">
                        '. $text .'
                        </div>
                    </div>';

        return $output;
    }

    /**
     * @param string $mode can be '%' or 'abs'
     * otherwise this value will be used $this->progress_bar_mode
     * @return string
     */
    public function getProgressBar($mode = null)
    {
        list($percentage, $text_add) = $this->get_progress_bar_text($mode);
        return self::get_progress_bar($percentage, $text_add);
    }

    /**
     * Gets the progress bar info to display inside the progress bar.
     * Also used by scorm_api.php
     * @param	string	$mode Mode of display (can be '%' or 'abs').abs means
     * we display a number of completed elements per total elements
     * @param	integer	$add Additional steps to fake as completed
     * @return	list array Percentage or number and symbol (% or /xx)
     */
    public function get_progress_bar_text($mode = '', $add = 0)
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_progress_bar_text()', 0);
        }
        if (empty($mode)) {
            $mode = $this->progress_bar_mode;
        }
        $total_items = $this->get_total_items_count_without_chapters();
        if ($this->debug > 2) {
            error_log('New LP - Total items available in this learnpath: ' . $total_items, 0);
        }
        $completeItems = $this->get_complete_items_count();
        if ($this->debug > 2) {
            error_log('New LP - Items completed so far: ' . $completeItems, 0);
        }
        if ($add != 0) {
            $completeItems += $add;
            if ($this->debug > 2) {
                error_log('New LP - Items completed so far (+modifier): ' . $completeItems, 0);
            }
        }
        $text = '';
        if ($completeItems > $total_items) {
            $completeItems = $total_items;
        }
        $percentage = 0;
        if ($mode == '%') {
            if ($total_items > 0) {
                $percentage = ((float) $completeItems / (float) $total_items) * 100;
            } else {
                $percentage = 0;
            }
            $percentage = number_format($percentage, 0);
            $text = '%';
        } elseif ($mode == 'abs') {
            $percentage = $completeItems;
            $text = '/' . $total_items;
        }

        return array(
            $percentage,
            $text
        );
    }

    /**
     * Gets the progress bar mode
     * @return	string	The progress bar mode attribute
     */
    public function get_progress_bar_mode()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_progress_bar_mode()', 0);
        }
        if (!empty ($this->progress_bar_mode)) {
            return $this->progress_bar_mode;
        } else {
            return '%';
        }
    }

    /**
     * Gets the learnpath proximity (remote or local)
     * @return	string	Learnpath proximity
     */
    public function get_proximity()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_proximity()', 0);
        }
        if (!empty ($this->proximity)) {
            return $this->proximity;
        } else {
            return '';
        }
    }

    /**
     * Gets the learnpath theme (remote or local)
     * @return	string	Learnpath theme
     */
    public function get_theme()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_theme()', 0);
        }
        if (!empty ($this->theme)) {
            return $this->theme;
        } else {
            return '';
        }
    }

    /**
     * Gets the learnpath session id
     * @return	string	Learnpath theme
     */
    public function get_lp_session_id()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_lp_session_id()', 0);
        }
        if (!empty ($this->lp_session_id)) {
            return $this->lp_session_id;
        } else {
            return 0;
        }
    }

    /**
     * Gets the learnpath image
     * @return	string	Web URL of the LP image
     */
    public function get_preview_image()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_preview_image()', 0);
        }
        if (!empty($this->preview_image)) {
            return $this->preview_image;
        } else {
            return '';
        }
    }

    /**
     * @param string $size
     * @param string $path_type
     * @return bool|string
     */
    public function get_preview_image_path($size = null, $path_type = 'web')
    {

        $preview_image = $this->get_preview_image();
        if (isset($preview_image) && !empty($preview_image)) {
            $image_sys_path = api_get_path(SYS_COURSE_PATH).$this->course_info['path'].'/upload/learning_path/images/';
            $image_path = api_get_path(WEB_COURSE_PATH).$this->course_info['path'].'/upload/learning_path/images/';

            if (isset($size)) {
                $info = pathinfo($preview_image);
                $image_custom_size = $info['filename'].'.'.$size.'.'.$info['extension'];
                if (file_exists($image_sys_path.$image_custom_size)) {
                    if ($path_type == 'web') {
                        return $image_path.$image_custom_size;
                    } else {
                        return $image_sys_path.$image_custom_size;
                    }
                }
            } else {
                if ($path_type == 'web') {
                    return $image_path.$preview_image;
                } else {
                    return $image_sys_path.$preview_image;
                }
            }
        }

        return false;
    }

    /**
     * Gets the learnpath author
     * @return	string	LP's author
     */
    public function get_author()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_author()', 0);
        }
        if (!empty ($this->author)) {
            return $this->author;
        } else {
            return '';
        }
    }

    /**
     * Gets the learnpath author
     * @return	string	LP's author
     */
    public function get_hide_toc_frame()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_author()', 0);
        }
        if (!empty ($this->hide_toc_frame)) {
            return $this->hide_toc_frame;
        } else {
            return '';
        }
    }

    /**
     * Generate a new prerequisites string for a given item. If this item was a sco and
     * its prerequisites were strings (instead of IDs), then transform those strings into
     * IDs, knowing that SCORM IDs are kept in the "ref" field of the lp_item table.
     * Prefix all item IDs that end-up in the prerequisites string by "ITEM_" to use the
     * same rule as the scorm_export() method
     * @param	integer		Item ID
     * @return	string		Prerequisites string ready for the export as SCORM
     */
    public function get_scorm_prereq_string($item_id)
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_scorm_prereq_string()', 0);
        }
        if (!is_object($this->items[$item_id])) {
            return false;
        }
        /** @var learnpathItem $oItem */
        $oItem = $this->items[$item_id];
        $prereq = $oItem->get_prereq_string();

        if (empty($prereq)) {
            return '';
        }
        if (preg_match('/^\d+$/', $prereq) && is_object($this->items[$prereq])) {
            // If the prerequisite is a simple integer ID and this ID exists as an item ID,
            // then simply return it (with the ITEM_ prefix).
            //return 'ITEM_' . $prereq;
            return $this->items[$prereq]->ref;
        } else {
            if (isset($this->refs_list[$prereq])) {
                // It's a simple string item from which the ID can be found in the refs list,
                // so we can transform it directly to an ID for export.
                return $this->items[$this->refs_list[$prereq]]->ref;
            } else if (isset($this->refs_list['ITEM_'.$prereq])) {
                return $this->items[$this->refs_list['ITEM_'.$prereq]]->ref;
            } else {
                // The last case, if it's a complex form, then find all the IDs (SCORM strings)
                // and replace them, one by one, by the internal IDs (chamilo db)
                // TODO: Modify the '*' replacement to replace the multiplier in front of it
                // by a space as well.
                $find = array (
                    '&',
                    '|',
                    '~',
                    '=',
                    '<>',
                    '{',
                    '}',
                    '*',
                    '(',
                    ')'
                );
                $replace = array (
                    ' ',
                    ' ',
                    ' ',
                    ' ',
                    ' ',
                    ' ',
                    ' ',
                    ' ',
                    ' ',
                    ' '
                );
                $prereq_mod = str_replace($find, $replace, $prereq);
                $ids = explode(' ', $prereq_mod);
                foreach ($ids as $id) {
                    $id = trim($id);
                    if (isset ($this->refs_list[$id])) {
                        $prereq = preg_replace('/[^a-zA-Z_0-9](' . $id . ')[^a-zA-Z_0-9]/', 'ITEM_' . $this->refs_list[$id], $prereq);
                    }
                }

                return $prereq;
            }
        }
    }

    /**
     * Returns the XML DOM document's node
     * @param	resource	Reference to a list of objects to search for the given ITEM_*
     * @param	string		The identifier to look for
     * @return	mixed		The reference to the element found with that identifier. False if not found
     */
    public function get_scorm_xml_node(& $children, $id)
    {
        for ($i = 0; $i < $children->length; $i++) {
            $item_temp = $children->item($i);
            if ($item_temp->nodeName == 'item') {
                if ($item_temp->getAttribute('identifier') == $id) {
                    return $item_temp;
                }
            }
            $subchildren = $item_temp->childNodes;
            if ($subchildren->length > 0) {
                $val = $this->get_scorm_xml_node($subchildren, $id);
                if (is_object($val)) {

                    return $val;
                }
            }
        }

        return false;
    }

    /**
     * Returns a usable array of stats related to the current learnpath and user
     * @return array	Well-formatted array containing status for the current learnpath
     */
    public function get_stats()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_stats()', 0);
        }
    }

    /**
     * Static method. Can be re-implemented by children. Gives an array of statistics for
     * the given course (for all learnpaths and all users)
     * @param	string	Course code
     * @return array	Well-formatted array containing status for the course's learnpaths
     */
    public function get_stats_course($course)
    {
        //if ($this->debug > 0) { error_log('New LP - In learnpath::get_stats_course()', 0); }
        // TODO
    }

    /**
     * Static method. Can be re-implemented by children. Gives an array of statistics for
     * the given course and learnpath (for all users)
     * @param	string	Course code
     * @param	integer	Learnpath ID
     * @return array	Well-formatted array containing status for the specified learnpath
     */
    public function get_stats_lp($course, $lp)
    {
        //if ($this->debug > 0) { error_log('New LP - In learnpath::get_stats_lp()', 0); }
        // TODO
    }

    /**
     * Static method. Can be re-implemented by children. Gives an array of statistics for
     * the given course, learnpath and user.
     * @param	string	Course code
     * @param	integer	Learnpath ID
     * @param	integer	User ID
     * @return array	Well-formatted array containing status for the specified learnpath and user
     */
    public function get_stats_lp_user($course, $lp, $user)
    {
        //if ($this->debug > 0) { error_log('New LP - In learnpath::get_stats_lp_user()', 0); }
        // TODO
    }

    /**
     * Static method. Can be re-implemented by children. Gives an array of statistics for
     * the given course and learnpath (for all users)
     * @param	string	Course code
     * @param	integer	User ID
     * @return array	Well-formatted array containing status for the user's learnpaths
     */
    public function get_stats_user($course, $user) {
        //if ($this->debug > 0) { error_log('New LP - In learnpath::get_stats_user()', 0); }
        // TODO
    }

    /**
     * Gets the status list for all LP's items
     * @return	array	Array of [index] => [item ID => current status]
     */
    public function get_items_status_list()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_items_status_list()', 0);
        }
        $list = array ();
        foreach ($this->ordered_items as $item_id) {
            $list[] = array (
                $item_id => $this->items[$item_id]->get_status()
            );
        }
        return $list;
    }

    /**
     * Return the number of interactions for the given learnpath Item View ID.
     * This method can be used as static.
     * @param	integer	Item View ID
     * @param   integer course id
     * @return	integer	Number of interactions
     */
    public static function get_interactions_count_from_db($lp_iv_id, $course_id)
    {
        $table = Database :: get_course_table(TABLE_LP_IV_INTERACTION);
        $lp_iv_id = intval($lp_iv_id);
        $course_id = intval($course_id);

        $sql = "SELECT count(*) FROM $table
                WHERE c_id = $course_id AND lp_iv_id = $lp_iv_id";
        $res = Database::query($sql);
        $num = 0;
        if (Database::num_rows($res)) {
            $row = Database::fetch_array($res);
            $num = $row[0];
        }
        return $num;
    }

    /**
     * Return the interactions as an array for the given lp_iv_id.
     * This method can be used as static.
     * @param	integer	Learnpath Item View ID
     * @return	array
     * @todo 	Transcode labels instead of switching to HTML (which requires to know the encoding of the LP)
     */
    public static function get_iv_interactions_array($lp_iv_id)
    {
        $course_id = api_get_course_int_id();
        $list = array();
        $table = Database :: get_course_table(TABLE_LP_IV_INTERACTION);

        if (empty($lp_iv_id)) {
            return array();
        }

        $sql = "SELECT * FROM $table
                WHERE c_id = ".$course_id." AND lp_iv_id = $lp_iv_id
                ORDER BY order_id ASC";
        $res = Database::query($sql);
        $num = Database :: num_rows($res);
        if ($num > 0) {
            $list[] = array (
                'order_id' => api_htmlentities(get_lang('Order'), ENT_QUOTES),
                'id' => api_htmlentities(get_lang('InteractionID'), ENT_QUOTES),
                'type' => api_htmlentities(get_lang('Type'), ENT_QUOTES),
                'time' => api_htmlentities(get_lang('TimeFinished'), ENT_QUOTES),
                'correct_responses' => api_htmlentities(get_lang('CorrectAnswers'), ENT_QUOTES),
                'student_response' => api_htmlentities(get_lang('StudentResponse'), ENT_QUOTES),
                'result' => api_htmlentities(get_lang('Result'), ENT_QUOTES),
                'latency' => api_htmlentities(get_lang('LatencyTimeSpent'), ENT_QUOTES)
            );
            while ($row = Database :: fetch_array($res)) {
                $list[] = array (
                    'order_id' => ($row['order_id'] + 1),
                    'id' => urldecode($row['interaction_id']), //urldecode because they often have %2F or stuff like that
                    'type' => $row['interaction_type'],
                    'time' => $row['completion_time'],
                    //'correct_responses' => $row['correct_responses'],
                    'correct_responses' => '', // Hide correct responses from students.
                    'student_response' => $row['student_response'],
                    'result' => $row['result'],
                    'latency' => $row['latency']
                );
            }
        }

        return $list;
    }

    /**
     * Return the number of objectives for the given learnpath Item View ID.
     * This method can be used as static.
     * @param	integer	Item View ID
     * @return	integer	Number of objectives
     */
    public static function get_objectives_count_from_db($lp_iv_id, $course_id)
    {
        $table = Database :: get_course_table(TABLE_LP_IV_OBJECTIVE);
        $course_id = intval($course_id);
        $lp_iv_id = intval($lp_iv_id);
        $sql = "SELECT count(*) FROM $table
                WHERE c_id = $course_id AND lp_iv_id = $lp_iv_id";
        //@todo seems that this always returns 0
        $res = Database::query($sql);
        $num = 0;
        if (Database::num_rows($res)) {
            $row = Database :: fetch_array($res);
            $num = $row[0];
        }

        return $num;
    }

    /**
     * Return the objectives as an array for the given lp_iv_id.
     * This method can be used as static.
     * @param	integer	Learnpath Item View ID
     * @return	array
     * @todo 	Translate labels
     */
    public static function get_iv_objectives_array($lp_iv_id = 0)
    {
        $course_id = api_get_course_int_id();
        $table = Database :: get_course_table(TABLE_LP_IV_OBJECTIVE);
        $sql = "SELECT * FROM $table
                WHERE c_id = $course_id AND lp_iv_id = $lp_iv_id
                ORDER BY order_id ASC";
        $res = Database::query($sql);
        $num = Database :: num_rows($res);
        $list = array();
        if ($num > 0) {
            $list[] = array(
                'order_id' => api_htmlentities(get_lang('Order'), ENT_QUOTES),
                'objective_id' => api_htmlentities(get_lang('ObjectiveID'), ENT_QUOTES),
                'score_raw' => api_htmlentities(get_lang('ObjectiveRawScore'), ENT_QUOTES),
                'score_max' => api_htmlentities(get_lang('ObjectiveMaxScore'), ENT_QUOTES),
                'score_min' => api_htmlentities(get_lang('ObjectiveMinScore'), ENT_QUOTES),
                'status' => api_htmlentities(get_lang('ObjectiveStatus'), ENT_QUOTES)
            );
            while ($row = Database :: fetch_array($res)) {
                $list[] = array (
                    'order_id' => ($row['order_id'] + 1),
                    'objective_id' => urldecode($row['objective_id']), // urldecode() because they often have %2F or stuff like that.
                    'score_raw' => $row['score_raw'],
                    'score_max' => $row['score_max'],
                    'score_min' => $row['score_min'],
                    'status' => $row['status']
                );
            }
        }

        return $list;
    }

    /**
     * Generate and return the table of contents for this learnpath. The (flat) table returned can be
     * used by get_html_toc() to be ready to display
     * @return	array	TOC as a table with 4 elements per row: title, link, status and level
     */
    public function get_toc()
    {
        if ($this->debug > 0) {
            error_log('learnpath::get_toc()', 0);
        }
        $toc = array();
        foreach ($this->ordered_items as $item_id) {
            if ($this->debug > 2) {
                error_log('learnpath::get_toc(): getting info for item ' . $item_id, 0);
            }
            // TODO: Change this link generation and use new function instead.
            $toc[] = array (
                'id'            => $item_id,
                'title'         => $this->items[$item_id]->get_title(),
                'status'        => $this->items[$item_id]->get_status(),
                'level'         => $this->items[$item_id]->get_level(),
                'type'          => $this->items[$item_id]->get_type(),
                'description'   => $this->items[$item_id]->get_description(),
                'path'          => $this->items[$item_id]->get_path(),
            );
        }
        if ($this->debug > 2) {
            error_log('New LP - In learnpath::get_toc() - TOC array: ' . print_r($toc, true), 0);
        }
        return $toc;
    }

    /**
     * Generate and return the table of contents for this learnpath. The JS
     * table returned is used inside of scorm_api.php
     * @return  string  A JS array vairiable construction
     */
    public function get_items_details_as_js($varname = 'olms.lms_item_types')
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_items_details_as_js()', 0);
        }
        $toc = $varname.' = new Array();';
        foreach ($this->ordered_items as $item_id) {
            $toc.= $varname."['i$item_id'] = '".$this->items[$item_id]->get_type()."';";
        }
        if ($this->debug > 2) {
            error_log('New LP - In learnpath::get_items_details_as_js() - TOC array: ' . print_r($toc, true), 0);
        }
        return $toc;
    }

    /**
     * Gets the learning path type
     * @param	boolean		Return the name? If false, return the ID. Default is false.
     * @return	mixed		Type ID or name, depending on the parameter
     */
    public function get_type($get_name = false)
    {
        $res = false;
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_type()', 0);
        }
        if (!empty ($this->type)) {
            if ($get_name) {
                // Get it from the lp_type table in main db.
            } else {
                $res = $this->type;
            }
        }
        if ($this->debug > 2) {
            error_log('New LP - In learnpath::get_type() - Returning ' . ($res ? $res : 'false'), 0);
        }
        return $res;
    }

    /**
     * Gets the learning path type as static method
     * @param	boolean		Return the name? If false, return the ID. Default is false.
     * @return	mixed		Type ID or name, depending on the parameter
     */
    public static function get_type_static($lp_id = 0)
    {
        $course_id = api_get_course_int_id();
        $tbl_lp = Database :: get_course_table(TABLE_LP_MAIN);
        $lp_id = intval($lp_id);
        $sql = "SELECT lp_type FROM $tbl_lp
                WHERE c_id = $course_id AND id = '" . $lp_id . "'";
        $res = Database::query($sql);
        if ($res === false) {
            return null;
        }
        if (Database :: num_rows($res) <= 0) {
            return null;
        }
        $row = Database :: fetch_array($res);
        return $row['lp_type'];
    }

    /**
     * Gets a flat list of item IDs ordered for display (level by level ordered by order_display)
     * This method can be used as abstract and is recursive
     * @param	integer	Learnpath ID
     * @param	integer	Parent ID of the items to look for
     * @return	mixed	Ordered list of item IDs or false on error
     */
    public static function get_flat_ordered_items_list($lp, $parent = 0, $course_id = null)
    {
        if (empty($course_id)) {
            $course_id = api_get_course_int_id();
        } else {
            $course_id = intval($course_id);
        }
        $list = array();

        if (empty($lp)) {
            return false;
        }

        $lp = intval($lp);
        $parent = intval($parent);

        $tbl_lp_item = Database :: get_course_table(TABLE_LP_ITEM);
        $sql = "SELECT id FROM $tbl_lp_item
                WHERE c_id = $course_id AND lp_id = $lp AND parent_item_id = $parent
                ORDER BY display_order";

        $res = Database::query($sql);
        while ($row = Database :: fetch_array($res)) {
            $sublist = learnpath :: get_flat_ordered_items_list($lp, $row['id'], $course_id);
            $list[] = $row['id'];
            foreach ($sublist as $item) {
                $list[] = $item;
            }
        }
        return $list;
    }

    /**
     * @return array
     */
    public static function getChapterTypes()
    {
        return array(
            'dokeos_chapter',
            'dokeos_module',
            'chapter',
            'dir'
        );
    }

    /**
     * Uses the table generated by get_toc() and returns an HTML-formatted string ready to display
     * @return	string	HTML TOC ready to display
     */
    public function get_html_toc($toc_list = null)
    {
        global $_configuration;
        $is_allowed_to_edit = api_is_allowed_to_edit(null, true, false, false);

        if ($this->debug > 0) {
            error_log('In learnpath::get_html_toc()', 0);
        }
        if (empty($toc_list)) {
            $toc_list = $this->get_toc();
        }
        //$html = '<div id="scorm_title" class="scorm-heading">'.Security::remove_XSS($this->get_name()) . '</div>';
        $html = '<div class="scorm-body">';
        $hide_teacher_icons_lp = isset($_configuration['hide_teacher_icons_lp']) ? $_configuration['hide_teacher_icons_lp'] : true;

        if ($is_allowed_to_edit && $hide_teacher_icons_lp == false) {
            $gradebook = Security :: remove_XSS($_GET['gradebook']);
            if ($this->get_lp_session_id() == api_get_session_id()) {
                $html .= '<div id="actions_lp" class="actions_lp">';
                $html .= '<div class="btn-group">';
                $html .= "<a class='btn btn-default' href='lp_controller.php?" . api_get_cidreq()."&gradebook=$gradebook&action=build&lp_id=" . $this->lp_id . "' target='_parent'>" . get_lang('Overview') . "</a>";
                $html .= "<a class='btn btn-default' href='lp_controller.php?" . api_get_cidreq()."&action=add_item&type=step&lp_id=" . $this->lp_id . "' target='_parent'>" . get_lang('Edit') . "</a>";
                $html .= '<a class="btn btn-default" href="lp_controller.php?'.api_get_cidreq()."&gradebook=$gradebook&action=edit&lp_id=" . $this->lp_id.'">'.get_lang('Settings').'</a>';
                $html .= '</div>';
                $html .= '</div>';
            }
        }

        $html .= '<div id="inner_lp_toc" class="inner_lp_toc">';
        require_once 'resourcelinker.inc.php';

        // Temporary variables.
        $mycurrentitemid = $this->get_current_item_id();
        $color_counter = 0;
        $i = 0;

        foreach ($toc_list as $item) {
            // TODO: Complete this
            $icon_name = array (
                'not attempted' => '../img/notattempted.gif',
                'incomplete'    => '../img/incomplete.png',
                'failed'        => '../img/delete.png',
                'completed'     => '../img/completed.png',
                'passed'        => '../img/passed.png',
                'succeeded'     => '../img/succeeded.png',
                'browsed'       => '../img/completed.png',
            );

            // Style Status

            $class_name = array (
                'not attempted' => 'scorm_not_attempted',
                'incomplete'    => 'scorm_not_attempted',
                'failed'        => 'scorm_failed',
                'completed'     => 'scorm_completed',
                'passed'        => 'scorm_completed',
                'succeeded'     => 'scorm_completed',
                'browsed'       => 'scorm_completed',
            );

            $scorm_color_background = 'row_odd';
            $style_item = '';

            if ($color_counter % 2 == 0) {
                $scorm_color_background = 'row_even';
            }

            $dirTypes = self::getChapterTypes();

            if (in_array($item['type'], $dirTypes)) {
                $scorm_color_background ='scorm_item_section ';
                $style_item = '';
            }
            if ($item['id'] == $this->current) {
                $scorm_color_background = 'scorm_item_normal '.$scorm_color_background.' scorm_highlight';
            } elseif (!in_array($item['type'], $dirTypes)) {
                $scorm_color_background = 'scorm_item_normal '.$scorm_color_background.' ';
            }

            $html .= '<div id="toc_' . $item['id'] . '" class="' . $scorm_color_background . ' '.$class_name[$item['status']].' ">';

            // Learning path title
            $title = $item['title'];
            if (empty ($title)) {
                $title = rl_get_resource_name(api_get_course_id(), $this->get_id(), $item['id']);
            }
            $title = Security::remove_XSS($title);

            // Learning path personalization
            // build the LP tree
            // The anchor atoc_ will let us center the TOC on the currently viewed item &^D
            $description = $item['description'];
            if (empty($description)) {
                $description = $title;
            }
            if (in_array($item['type'], $dirTypes)) {
                // Chapters
                $html .= '<div class="'.$style_item.' scorm_section_level_'.$item['level'].'" title="'.$description.'" >';
            } else {
                $html .= '<div class="'.$style_item.' scorm_item_level_'.$item['level'].' scorm_type_'.learnpath::format_scorm_type_item($item['type']).'" title="'.$description.'" >';
                $html .= '<a name="atoc_'.$item['id'].'" />';
            }

            if (in_array($item['type'], $dirTypes)) {
                // Chapter
                // if you want to put an image before, you should use css
                $html .= stripslashes($title);
            } else {
                $this->get_link('http', $item['id'], $toc_list);
                $html .= '<a class="items-list" href="" onClick="switch_item(' .$mycurrentitemid . ',' .$item['id'] . ');' .'return false;" >' . stripslashes($title) . '</a>';
            }
            $html .= "</div>";

            if ($scorm_color_background != '') {
                $html .= '</div>';
            }

            $color_counter++;
        }
        $html .= "</div>";
        $html .= "</div>";
        return $html;
    }

    /**
     * Gets the learnpath maker name - generally the editor's name
     * @return	string	Learnpath maker name
     */
    public function get_maker()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_maker()', 0);
        }
        if (!empty ($this->maker)) {
            return $this->maker;
        } else {
            return '';
        }
    }

    /**
     * Gets the user-friendly message stored in $this->message
     * @return	string	Message
     */
    public function get_message()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_message()', 0);
        }
        return $this->message;
    }

    /**
     * Gets the learnpath name/title
     * @return	string	Learnpath name/title
     */
    public function get_name()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_name()', 0);
        }
        if (!empty ($this->name)) {
            return $this->name;
        } else {
            return 'N/A';
        }
    }

    /**
     * Gets a link to the resource from the present location, depending on item ID.
     * @param	string	$type Type of link expected
     * @param	integer	$item_id Learnpath item ID
     * @return	string	$provided_toc Link to the lp_item resource
     */
    public function get_link($type = 'http', $item_id = null, $provided_toc = false)
    {
        $course_id = $this->get_course_int_id();

        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_link(' . $type . ',' . $item_id . ')', 0);
        }
        if (empty($item_id)) {
            if ($this->debug > 2) {
                error_log('New LP - In learnpath::get_link() - no item id given in learnpath::get_link(), using current: ' . $this->get_current_item_id(), 0);
            }
            $item_id = $this->get_current_item_id();
        }

        if (empty($item_id)) {
            if ($this->debug > 2) {
                error_log('New LP - In learnpath::get_link() - no current item id found in learnpath object', 0);
            }
            //still empty, this means there was no item_id given and we are not in an object context or
            //the object property is empty, return empty link
            $item_id = $this->first();
            return '';
        }

        $file = '';
        $lp_table = Database::get_course_table(TABLE_LP_MAIN);
        $lp_item_table = Database::get_course_table(TABLE_LP_ITEM);
        $lp_item_view_table = Database::get_course_table(TABLE_LP_ITEM_VIEW);
        $item_id = intval($item_id);

        $sql = "SELECT
                    l.lp_type as ltype,
                    l.path as lpath,
                    li.item_type as litype,
                    li.path as lipath,
                    li.parameters as liparams
        		FROM $lp_table l
                INNER JOIN $lp_item_table li
                    ON (li.lp_id = l.id AND l.c_id = $course_id AND li.c_id = $course_id )
        		WHERE li.id = $item_id ";
        if ($this->debug > 2) {
            error_log('New LP - In learnpath::get_link() - selecting item ' . $sql, 0);
        }
        $res = Database::query($sql);
        if (Database :: num_rows($res) > 0) {
            $row = Database :: fetch_array($res);
            $lp_type = $row['ltype'];
            $lp_path = $row['lpath'];
            $lp_item_type = $row['litype'];
            $lp_item_path = $row['lipath'];
            $lp_item_params = $row['liparams'];
            if (empty ($lp_item_params) && strpos($lp_item_path, '?') !== false) {
                list ($lp_item_path, $lp_item_params) = explode('?', $lp_item_path);
            }
            $sys_course_path = api_get_path(SYS_COURSE_PATH) . api_get_course_path();
            if ($type == 'http') {
                $course_path = api_get_path(WEB_COURSE_PATH) . api_get_course_path(); //web path
            } else {
                $course_path = $sys_course_path; //system path
            }

            // Fixed issue BT#1272 - If the item type is a Chamilo Item (quiz, link, etc), then change the lp type to thread it as a normal Chamilo LP not a SCO.
            if (in_array($lp_item_type, array('quiz', 'document', 'link', 'forum', 'thread', 'student_publication'))) {
                $lp_type = 1;
            }

            if ($this->debug > 2) {
                error_log('New LP - In learnpath::get_link() - $lp_type ' . $lp_type, 0);
                error_log('New LP - In learnpath::get_link() - $lp_item_type ' . $lp_item_type, 0);
            }

            // Now go through the specific cases to get the end of the path
            // @todo Use constants instead of int values.
            switch ($lp_type) {
                case 1 :
                    if ($lp_item_type == 'dokeos_chapter') {
                        $file = 'lp_content.php?type=dir';
                    } else {
                        require_once 'resourcelinker.inc.php';
                        $file = rl_get_resource_link_for_learnpath(
                            $course_id,
                            $this->get_id(),
                            $item_id,
                            $this->get_view_id()
                        );

                        if ($this->debug > 0) {
                            error_log('rl_get_resource_link_for_learnpath - file: ' . $file, 0);
                        }

                        if ($lp_item_type == 'link') {
                            if (Link::is_youtube_link($file)) {
                                $src  = Link::get_youtube_video_id($file);
                                $file = 'embed.php?type=youtube&source='.$src;
                            } elseif (Link::isVimeoLink($file)) {
                                $src  = Link::getVimeoLinkId($file);
                                $file = 'embed.php?type=vimeo&source='.$src;
                            } else {
                                // If the current site is HTTPS and the link is
                                // HTTP, browsers will refuse opening the link
                                $urlId = api_get_current_access_url_id();
                                $url = api_get_access_url($urlId, false);
                                $protocol = substr($url['url'], 0, 5);
                                if ($protocol === 'https') {
                                    $linkProtocol = substr($file, 0, 5);
                                    if ($linkProtocol === 'http:') {
                                        //this is the special intervention case
                                        $file = 'embed.php?type=nonhttps&source=' .  urlencode($file);
                                    }
                                }
                            }
                        } else {
                            // Check how much attempts of a exercise exits in lp
                            $lp_item_id = $this->get_current_item_id();
                            $lp_view_id = $this->get_view_id();

                            $prevent_reinit = null;
                            if (isset($this->items[$this->current])) {
                                $prevent_reinit = $this->items[$this->current]->get_prevent_reinit();
                            }

                            if (empty($provided_toc)) {
                                if ($this->debug > 0) {
                                    error_log('In learnpath::get_link() Loading get_toc ', 0);
                                }
                                $list = $this->get_toc();
                            } else {
                                if ($this->debug > 0) {
                                    error_log('In learnpath::get_link() Loading get_toc from "cache" ', 0);
                                }
                                $list = $provided_toc;
                            }

                            $type_quiz = false;

                            foreach ($list as $toc) {
                                if ($toc['id'] == $lp_item_id && ($toc['type'] == 'quiz')) {
                                    $type_quiz = true;
                                }
                            }

                            if ($type_quiz) {
                                $lp_item_id = intval($lp_item_id);
                                $lp_view_id = intval($lp_view_id);
                                $sql = "SELECT count(*) FROM $lp_item_view_table
                                        WHERE
                                            c_id = $course_id AND
                                            lp_item_id='" . $lp_item_id . "' AND
                                            lp_view_id ='" . $lp_view_id . "' AND
                                            status='completed'";
                                $result = Database::query($sql);
                                $row_count = Database :: fetch_row($result);
                                $count_item_view = (int) $row_count[0];
                                $not_multiple_attempt = 0;
                                if ($prevent_reinit === 1 && $count_item_view > 0) {
                                    $not_multiple_attempt = 1;
                                }
                                $file .= '&not_multiple_attempt=' . $not_multiple_attempt;
                            }

                            $tmp_array = explode('/', $file);
                            $document_name = $tmp_array[count($tmp_array) - 1];
                            if (strpos($document_name, '_DELETED_')) {
                                $file = 'blank.php?error=document_deleted';
                            }
                        }
                    }
                    break;
                case 2 :
                    if ($this->debug > 2) {
                        error_log('New LP - In learnpath::get_link() ' . __LINE__ . ' - Item type: ' . $lp_item_type, 0);
                    }

                    if ($lp_item_type != 'dir') {
                        // Quite complex here:
                        // We want to make sure 'http://' (and similar) links can
                        // be loaded as is (withouth the Chamilo path in front) but
                        // some contents use this form: resource.htm?resource=http://blablabla
                        // which means we have to find a protocol at the path's start, otherwise
                        // it should not be considered as an external URL.

                        //if ($this->prerequisites_match($item_id)) {
                        if (preg_match('#^[a-zA-Z]{2,5}://#', $lp_item_path) != 0) {
                            if ($this->debug > 2) {
                                error_log('New LP - In learnpath::get_link() ' . __LINE__ . ' - Found match for protocol in ' . $lp_item_path, 0);
                            }
                            // Distant url, return as is.
                            $file = $lp_item_path;
                        } else {
                            if ($this->debug > 2) {
                                error_log('New LP - In learnpath::get_link() ' . __LINE__ . ' - No starting protocol in ' . $lp_item_path, 0);
                            }
                            // Prevent getting untranslatable urls.
                            $lp_item_path = preg_replace('/%2F/', '/', $lp_item_path);
                            $lp_item_path = preg_replace('/%3A/', ':', $lp_item_path);
                            // Prepare the path.
                            $file = $course_path . '/scorm/' . $lp_path . '/' . $lp_item_path;
                            // TODO: Fix this for urls with protocol header.
                            $file = str_replace('//', '/', $file);
                            $file = str_replace(':/', '://', $file);
                            if (substr($lp_path, -1) == '/') {
                                $lp_path = substr($lp_path, 0, -1);
                            }

                            if (!is_file(realpath($sys_course_path . '/scorm/' . $lp_path . '/' . $lp_item_path))) {
                                // if file not found.
                                $decoded = html_entity_decode($lp_item_path);
                                list ($decoded) = explode('?', $decoded);
                                if (!is_file(realpath($sys_course_path . '/scorm/' . $lp_path . '/' . $decoded))) {
                                    require_once 'resourcelinker.inc.php';
                                    $file = rl_get_resource_link_for_learnpath(
                                        $course_id,
                                        $this->get_id(),
                                        $item_id,
                                        $this->get_view_id()
                                    );
                                    if (empty($file)) {
                                        $file = 'blank.php?error=document_not_found';
                                    } else {
                                        $tmp_array = explode('/', $file);
                                        $document_name = $tmp_array[count($tmp_array) - 1];
                                        if (strpos($document_name, '_DELETED_')) {
                                            $file = 'blank.php?error=document_deleted';
                                        } else {
                                            $file = 'blank.php?error=document_not_found';
                                        }
                                    }
                                } else {
                                    $file = $course_path . '/scorm/' . $lp_path . '/' . $decoded;
                                }
                            }
                        }

                        // We want to use parameters if they were defined in the imsmanifest
                        if (strpos($file, 'blank.php') === false) {
                            $file .= (strstr($file, '?') === false ? '?' : '') . $lp_item_params;
                        }
                    } else {
                        $file = 'lp_content.php?type=dir';
                    }
                    break;
                case 3 :
                    if ($this->debug > 2) {
                        error_log('New LP - In learnpath::get_link() ' . __LINE__ . ' - Item type: ' . $lp_item_type, 0);
                    }
                    // Formatting AICC HACP append URL.
                    $aicc_append = '?aicc_sid=' . urlencode(session_id()) . '&aicc_url=' . urlencode(api_get_path(WEB_CODE_PATH) . 'newscorm/aicc_hacp.php') . '&';
                    if (!empty($lp_item_params)) {
                        $aicc_append .= $lp_item_params . '&';
                    }
                    if ($lp_item_type != 'dir') {
                        // Quite complex here:
                        // We want to make sure 'http://' (and similar) links can
                        // be loaded as is (withouth the Chamilo path in front) but
                        // some contents use this form: resource.htm?resource=http://blablabla
                        // which means we have to find a protocol at the path's start, otherwise
                        // it should not be considered as an external URL.

                        if (preg_match('#^[a-zA-Z]{2,5}://#', $lp_item_path) != 0) {
                            if ($this->debug > 2) {
                                error_log('New LP - In learnpath::get_link() ' . __LINE__ . ' - Found match for protocol in ' . $lp_item_path, 0);
                            }
                            // Distant url, return as is.
                            $file = $lp_item_path;
                            // Enabled and modified by Ivan Tcholakov, 16-OCT-2008.
                            /*
                            if (stristr($file,'<servername>') !== false) {
                                $file = str_replace('<servername>', $course_path.'/scorm/'.$lp_path.'/', $lp_item_path);
                            }
                            */
                            if (stripos($file, '<servername>') !== false) {
                                //$file = str_replace('<servername>',$course_path.'/scorm/'.$lp_path.'/',$lp_item_path);
                                $web_course_path = str_replace('https://', '', str_replace('http://', '', $course_path));
                                $file = str_replace('<servername>', $web_course_path . '/scorm/' . $lp_path, $lp_item_path);
                            }
                            //
                            $file .= $aicc_append;
                        } else {
                            if ($this->debug > 2) {
                                error_log('New LP - In learnpath::get_link() ' . __LINE__ . ' - No starting protocol in ' . $lp_item_path, 0);
                            }
                            // Prevent getting untranslatable urls.
                            $lp_item_path = preg_replace('/%2F/', '/', $lp_item_path);
                            $lp_item_path = preg_replace('/%3A/', ':', $lp_item_path);
                            // Prepare the path - lp_path might be unusable because it includes the "aicc" subdir name.
                            $file = $course_path . '/scorm/' . $lp_path . '/' . $lp_item_path;
                            // TODO: Fix this for urls with protocol header.
                            $file = str_replace('//', '/', $file);
                            $file = str_replace(':/', '://', $file);
                            $file .= $aicc_append;
                        }
                    } else {
                        $file = 'lp_content.php?type=dir';
                    }
                    break;
                case 4 :
                    break;
                default :
                    break;
            }
            // Replace &amp; by & because &amp; will break URL with params
            $file = !empty($file) ? str_replace('&amp;', '&', $file) : '';
        }
        if ($this->debug > 2) {
            error_log('New LP - In learnpath::get_link() - returning "' . $file . '" from get_link', 0);
        }
        return $file;
    }

    /**
     * Gets the latest usable view or generate a new one
     * @param	integer	Optional attempt number. If none given, takes the highest from the lp_view table
     * @return	integer	DB lp_view id
     */
    public function get_view($attempt_num = 0)
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_view()', 0);
        }
        $search = '';
        // Use $attempt_num to enable multi-views management (disabled so far).
        if ($attempt_num != 0 AND intval(strval($attempt_num)) == $attempt_num) {
            $search = 'AND view_count = ' . $attempt_num;
        }
        // When missing $attempt_num, search for a unique lp_view record for this lp and user.
        $lp_view_table = Database :: get_course_table(TABLE_LP_VIEW);

        $course_id = api_get_course_int_id();
        $sessionId = api_get_session_id();

        $sql = "SELECT id, view_count FROM $lp_view_table
        		WHERE
        		    c_id = " . $course_id . " AND
        		    lp_id = " . $this->get_id() . " AND
        		    user_id = " . $this->get_user_id() . " AND
        		    session_id = $sessionId
        		    $search
                ORDER BY view_count DESC";
        $res = Database::query($sql);
        if (Database :: num_rows($res) > 0) {
            $row = Database :: fetch_array($res);
            $this->lp_view_id = $row['id'];
        } else if (!api_is_invitee()) {
            // There is no database record, create one.
            $sql = "INSERT INTO $lp_view_table (c_id, lp_id,user_id, view_count, session_id) VALUES
            		($course_id, " . $this->get_id() . "," . $this->get_user_id() . ", 1, $sessionId)";
            Database::query($sql);
            $id = Database :: insert_id();
            $this->lp_view_id = $id;

            $sql = "UPDATE $lp_view_table SET id = iid WHERE iid = $id";
            Database::query($sql);
        }

        return $this->lp_view_id;
    }

    /**
     * Gets the current view id
     * @return	integer	View ID (from lp_view)
     */
    public function get_view_id()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_view_id()', 0);
        }
        if (!empty ($this->lp_view_id)) {
            return $this->lp_view_id;
        } else {
            return 0;
        }
    }

    /**
     * Gets the update queue
     * @return	array	Array containing IDs of items to be updated by JavaScript
     */
    public function get_update_queue()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_update_queue()', 0);
        }
        return $this->update_queue;
    }

    /**
     * Gets the user ID
     * @return	integer	User ID
     */
    public function get_user_id()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::get_user_id()', 0);
        }
        if (!empty ($this->user_id)) {
            return $this->user_id;
        } else {
            return false;
        }
    }

    /**
     * Checks if any of the items has an audio element attached
     * @return  bool    True or false
     */
    public function has_audio()
    {
        if ($this->debug > 1) {
            error_log('New LP - In learnpath::has_audio()', 0);
        }
        $has = false;
        foreach ($this->items as $i => $item) {
            if (!empty ($this->items[$i]->audio)) {
                $has = true;
                break;
            }
        }
        return $has;
    }

    /**
     * Logs a message into a file
     * @param	string 	Message to log
     * @return	boolean	True on success, false on error or if msg empty
     */
    public function log($msg)
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::log()', 0);
        }
        // TODO
        $this->error .= $msg;
        return true;
    }

    /**
     * Moves an item up and down at its level
     * @param	integer	Item to move up and down
     * @param	string	Direction 'up' or 'down'
     * @return	integer	New display order, or false on error
     */
    public function move_item($id, $direction)
    {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::move_item(' . $id . ',' . $direction . ')', 0);
        }
        if (empty($id) || empty($direction)) {
            return false;
        }
        $tbl_lp_item = Database :: get_course_table(TABLE_LP_ITEM);
        $sql_sel = "SELECT *
                    FROM " . $tbl_lp_item . "
                    WHERE c_id = ".$course_id." AND id = " . $id;
        $res_sel = Database::query($sql_sel);
        // Check if elem exists.
        if (Database :: num_rows($res_sel) < 1) {
            return false;
        }
        // Gather data.
        $row = Database :: fetch_array($res_sel);
        $previous = $row['previous_item_id'];
        $next = $row['next_item_id'];
        $display = $row['display_order'];
        $parent = $row['parent_item_id'];
        $lp = $row['lp_id'];
        // Update the item (switch with previous/next one).
        switch ($direction) {
            case 'up':
                if ($this->debug > 2) {
                    error_log('Movement up detected', 0);
                }
                if ($display <= 1) { /*do nothing*/
                } else {
                    $sql_sel2 = "SELECT * FROM $tbl_lp_item
                                 WHERE c_id = ".$course_id." AND id = $previous";

                    if ($this->debug > 2) {
                        error_log('Selecting previous: ' . $sql_sel2, 0);
                    }
                    $res_sel2 = Database::query($sql_sel2);
                    if (Database :: num_rows($res_sel2) < 1) {
                        $previous_previous = 0;
                    }
                    // Gather data.
                    $row2 = Database :: fetch_array($res_sel2);
                    $previous_previous = $row2['previous_item_id'];
                    // Update previous_previous item (switch "next" with current).
                    if ($previous_previous != 0) {
                        $sql_upd2 = "UPDATE $tbl_lp_item SET
                                        next_item_id = $id
                                    WHERE c_id = ".$course_id." AND id = $previous_previous";
                        if ($this->debug > 2) {
                            error_log($sql_upd2, 0);
                        }
                        Database::query($sql_upd2);
                    }
                    // Update previous item (switch with current).
                    if ($previous != 0) {
                        $sql_upd2 = "UPDATE $tbl_lp_item SET
                                    next_item_id = $next,
                                    previous_item_id = $id,
                                    display_order = display_order +1
                                    WHERE c_id = ".$course_id." AND id = $previous";
                        if ($this->debug > 2) {
                            error_log($sql_upd2, 0);
                        }
                        Database::query($sql_upd2);
                    }

                    // Update current item (switch with previous).
                    if ($id != 0) {
                        $sql_upd2 = "UPDATE $tbl_lp_item SET
                                        next_item_id = $previous,
                                        previous_item_id = $previous_previous,
                                        display_order = display_order-1
                                    WHERE c_id = ".$course_id." AND id = $id";
                        if ($this->debug > 2) {
                            error_log($sql_upd2, 0);
                        }
                        Database::query($sql_upd2);
                    }
                    // Update next item (new previous item).
                    if ($next != 0) {
                        $sql_upd2 = "UPDATE $tbl_lp_item SET previous_item_id = $previous
                                     WHERE c_id = ".$course_id." AND id = $next";
                        if ($this->debug > 2) {
                            error_log($sql_upd2, 0);
                        }
                        Database::query($sql_upd2);
                    }
                    $display = $display -1;
                }
                break;
            case 'down':
                if ($this->debug > 2) {
                    error_log('Movement down detected', 0);
                }
                if ($next == 0) { /* Do nothing. */
                } else {
                    $sql_sel2 = "SELECT * FROM $tbl_lp_item WHERE c_id = ".$course_id." AND id = $next";
                    if ($this->debug > 2) {
                        error_log('Selecting next: ' . $sql_sel2, 0);
                    }
                    $res_sel2 = Database::query($sql_sel2);
                    if (Database :: num_rows($res_sel2) < 1) {
                        $next_next = 0;
                    }
                    // Gather data.
                    $row2 = Database :: fetch_array($res_sel2);
                    $next_next = $row2['next_item_id'];
                    // Update previous item (switch with current).
                    if ($previous != 0) {
                        $sql_upd2 = "UPDATE $tbl_lp_item SET next_item_id = $next
                                     WHERE c_id = ".$course_id." AND id = $previous";
                        Database::query($sql_upd2);
                    }
                    // Update current item (switch with previous).
                    if ($id != 0) {
                        $sql_upd2 = "UPDATE $tbl_lp_item SET
                                     previous_item_id = $next, next_item_id = $next_next, display_order = display_order+1
                                     WHERE c_id = ".$course_id." AND id = $id";
                        Database::query($sql_upd2);
                    }

                    // Update next item (new previous item).
                    if ($next != 0) {
                        $sql_upd2 = "UPDATE $tbl_lp_item SET
                                     previous_item_id = $previous, next_item_id = $id, display_order = display_order-1
                                     WHERE c_id = ".$course_id." AND id = $next";
                        Database::query($sql_upd2);
                    }

                    // Update next_next item (switch "previous" with current).
                    if ($next_next != 0) {
                        $sql_upd2 = "UPDATE $tbl_lp_item SET
                                     previous_item_id = $id
                                     WHERE c_id = ".$course_id." AND id = $next_next";
                        Database::query($sql_upd2);
                    }
                    $display = $display +1;
                }
                break;
            default :
                return false;
        }
        return $display;
    }

    /**
     * Move a learnpath up (display_order)
     * @param	integer	Learnpath ID
     */
    public function move_up($lp_id)
    {
        $course_id = api_get_course_int_id();
        $lp_table = Database :: get_course_table(TABLE_LP_MAIN);
        $sql = "SELECT * FROM $lp_table
                WHERE c_id = ".$course_id."
                ORDER BY display_order";
        $res = Database::query($sql);
        if ($res === false)
            return false;
        $lps = array ();
        $lp_order = array ();
        $num = Database :: num_rows($res);
        // First check the order is correct, globally (might be wrong because
        // of versions < 1.8.4)
        if ($num > 0) {
            $i = 1;
            while ($row = Database :: fetch_array($res)) {
                if ($row['display_order'] != $i) { // If we find a gap in the order, we need to fix it.
                    $need_fix = true;
                    $sql_u = "UPDATE $lp_table SET display_order = $i
                              WHERE c_id = ".$course_id." AND id = " . $row['id'];
                    Database::query($sql_u);
                }
                $row['display_order'] = $i;
                $lps[$row['id']] = $row;
                $lp_order[$i] = $row['id'];
                $i++;
            }
        }
        if ($num > 1) { // If there's only one element, no need to sort.
            $order = $lps[$lp_id]['display_order'];
            if ($order > 1) { // If it's the first element, no need to move up.
                $sql_u1 = "UPDATE $lp_table SET display_order = $order
                           WHERE c_id = ".$course_id." AND id = " . $lp_order[$order - 1];
                Database::query($sql_u1);
                $sql_u2 = "UPDATE $lp_table SET display_order = " . ($order - 1) . "
                           WHERE c_id = ".$course_id." AND id = " . $lp_id;
                Database::query($sql_u2);
            }
        }
    }

    /**
     * Move a learnpath down (display_order)
     * @param	integer	Learnpath ID
     */
    public function move_down($lp_id)
    {
        $course_id = api_get_course_int_id();
        $lp_table = Database :: get_course_table(TABLE_LP_MAIN);
        $sql = "SELECT * FROM $lp_table
                WHERE c_id = ".$course_id."
                ORDER BY display_order";
        $res = Database::query($sql);
        if ($res === false)
            return false;
        $lps = array ();
        $lp_order = array ();
        $num = Database :: num_rows($res);
        $max = 0;
        // First check the order is correct, globally (might be wrong because
        // of versions < 1.8.4).
        if ($num > 0) {
            $i = 1;
            while ($row = Database :: fetch_array($res)) {
                $max = $i;
                if ($row['display_order'] != $i) { // If we find a gap in the order, we need to fix it.
                    $need_fix = true;
                    $sql_u = "UPDATE $lp_table SET display_order = $i
                              WHERE c_id = ".$course_id." AND id = " . $row['id'];
                    $res_u = Database::query($sql_u);
                }
                $row['display_order'] = $i;
                $lps[$row['id']] = $row;
                $lp_order[$i] = $row['id'];
                $i++;
            }
        }
        if ($num > 1) { // If there's only one element, no need to sort.
            $order = $lps[$lp_id]['display_order'];
            if ($order < $max) { // If it's the first element, no need to move up.
                $sql_u1 = "UPDATE $lp_table SET display_order = $order
                           WHERE c_id = ".$course_id." AND id = " . $lp_order[$order + 1];
                Database::query($sql_u1);
                $sql_u2 = "UPDATE $lp_table SET display_order = " . ($order + 1) . "
                           WHERE c_id = ".$course_id." AND id = " . $lp_id;
                Database::query($sql_u2);
            }
        }
    }

    /**
     * Updates learnpath attributes to point to the next element
     * The last part is similar to set_current_item but processing the other way around
     */
    public function next()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::next()', 0);
        }
        $this->last = $this->get_current_item_id();
        $this->items[$this->last]->save(false, $this->prerequisites_match($this->last));
        $this->autocomplete_parents($this->last);
        $new_index = $this->get_next_index();
        if ($this->debug > 2) {
            error_log('New LP - New index: ' . $new_index, 0);
        }
        $this->index = $new_index;
        if ($this->debug > 2) {
            error_log('New LP - Now having orderedlist[' . $new_index . '] = ' . $this->ordered_items[$new_index], 0);
        }
        $this->current = $this->ordered_items[$new_index];
        if ($this->debug > 2) {
            error_log('New LP - new item id is ' . $this->current . '-' . $this->get_current_item_id(), 0);
        }
    }

    /**
     * Open a resource = initialise all local variables relative to this resource. Depending on the child
     * class, this might be redefined to allow several behaviours depending on the document type.
     * @param integer Resource ID
     * @return boolean True on success, false otherwise
     */
    public function open($id)
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::open()', 0);
        }
        // TODO:
        // set the current resource attribute to this resource
        // switch on element type (redefine in child class?)
        // set status for this item to "opened"
        // start timer
        // initialise score
        $this->index = 0; //or = the last item seen (see $this->last)
    }

    /**
     * Check that all prerequisites are fulfilled. Returns true and an
     * empty string on succes, returns false
     * and the prerequisite string on error.
     * This function is based on the rules for aicc_script language as
     * described in the SCORM 1.2 CAM documentation page 108.
     * @param	integer	$itemId Optional item ID. If none given, uses the current open item.
     * @return	boolean	True if prerequisites are matched, false otherwise -
     * Empty string if true returned, prerequisites string otherwise.
     */
    public function prerequisites_match($itemId = null)
    {
        $debug = $this->debug;
        if ($debug > 0) {
            error_log('In learnpath::prerequisites_match()', 0);
        }

        if (empty($itemId)) {
            $itemId = $this->current;
        }

        $currentItem = $this->getItem($itemId);

        if ($currentItem) {
            if ($this->type == 2) {
                // Getting prereq from scorm
                $prereq_string = $this->get_scorm_prereq_string($itemId);
            } else {
                $prereq_string = $currentItem->get_prereq_string();
            }

            if (empty($prereq_string)) {
                if ($debug > 0) {
                    error_log('Found prereq_string is empty return true');
                }
                return true;
            }
            // Clean spaces.
            $prereq_string = str_replace(' ', '', $prereq_string);
            if ($debug > 0) {
                error_log('Found prereq_string: ' . $prereq_string, 0);
            }
            // Now send to the parse_prereq() function that will check this component's prerequisites.
            $result = $currentItem->parse_prereq(
                $prereq_string,
                $this->items,
                $this->refs_list,
                $this->get_user_id()
            );

            if ($result === false) {
                $this->set_error_msg($currentItem->prereq_alert);
            }
        } else {
            $result = true;
            if ($debug > 1) {
                error_log('$this->items[' . $itemId . '] was not an object', 0);
            }
        }

        if ($debug > 1) {
            error_log('End of prerequisites_match(). Error message is now ' . $this->error, 0);
        }
        return $result;
    }

    /**
     * Updates learnpath attributes to point to the previous element
     * The last part is similar to set_current_item but processing the other way around
     */
    public function previous()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::previous()', 0);
        }
        $this->last = $this->get_current_item_id();
        $this->items[$this->last]->save(false, $this->prerequisites_match($this->last));
        $this->autocomplete_parents($this->last);
        $new_index = $this->get_previous_index();
        $this->index = $new_index;
        $this->current = $this->ordered_items[$new_index];
    }

    /**
     * Publishes a learnpath. This basically means show or hide the learnpath
     * to normal users.
     * Can be used as abstract
     * @param	integer	Learnpath ID
     * @param	string	New visibility
     */
    public static function toggle_visibility($lp_id, $set_visibility = 1)
    {
        $action = 'visible';
        if ($set_visibility != 1) {
            $action = 'invisible';
            self::toggle_publish($lp_id, 'i');
        }

        return api_item_property_update(
            api_get_course_info(),
            TOOL_LEARNPATH,
            $lp_id,
            $action,
            api_get_user_id()
        );
    }

    /**
     * Publishes a learnpath. This basically means show or hide the learnpath
     * on the course homepage
     * Can be used as abstract
     * @param	integer	$lp_id Learnpath id
     * @param	string	$set_visibility New visibility (v/i - visible/invisible)
     * @return bool
     */
    public static function toggle_publish($lp_id, $set_visibility = 'v')
    {
        $course_id = api_get_course_int_id();
        $tbl_lp = Database :: get_course_table(TABLE_LP_MAIN);
        $lp_id = intval($lp_id);
        $sql = "SELECT * FROM $tbl_lp
                WHERE c_id = ".$course_id." AND id = $lp_id";
        $result = Database::query($sql);
        if (Database::num_rows($result)) {
            $row = Database :: fetch_array($result);
            $name = domesticate($row['name']);
            if ($set_visibility == 'i') {
                $s = $name . " " . get_lang('LearnpathNotPublished');
                $dialogBox = $s;
                $v = 0;
            }
            if ($set_visibility == 'v') {
                $s = $name . " " . get_lang('LearnpathPublished');
                $dialogBox = $s;
                $v = 1;
            }
        } else {
            return false;
        }

        $session_id = api_get_session_id();
        $session_condition = api_get_session_condition($session_id);

        $tbl_tool = Database :: get_course_table(TABLE_TOOL_LIST);
        $link = 'newscorm/lp_controller.php?action=view&lp_id='.$lp_id.'&id_session='.$session_id;
        $sql = "SELECT * FROM $tbl_tool
                WHERE
                    c_id = ".$course_id." AND
                    link='$link' and
                    image='scormbuilder.gif' and
                    link LIKE '$link%'
                    $session_condition
                ";
        $result = Database::query($sql);
        $num = Database :: num_rows($result);
        if ($set_visibility == 'i' && $num > 0) {
            $sql = "DELETE FROM $tbl_tool
                    WHERE c_id = ".$course_id." AND (link='$link' and image='scormbuilder.gif' $session_condition)";
            Database::query($sql);

        } elseif ($set_visibility == 'v' && $num == 0) {
            $sql = "INSERT INTO $tbl_tool (category, c_id, name, link, image, visibility, admin, address, added_tool, session_id) VALUES
            	    ('authoring', $course_id, '$name', '$link', 'scormbuilder.gif', '$v', '0','pastillegris.gif', 0, $session_id)";
            Database::query($sql);

            $insertId = Database::insert_id();
            if ($insertId) {
                $sql = "UPDATE $tbl_tool SET id = iid WHERE iid = $insertId";
                Database::query($sql);
            }
        } elseif ($set_visibility == 'v' && $num > 0) {
            $sql = "UPDATE $tbl_tool SET
                        c_id = $course_id,
                        name = '$name',
                        link = '$link',
                        image = 'scormbuilder.gif',
                        visibility = '$v',
                        admin = '0',
                        address = 'pastillegris.gif',
                        added_tool = 0,
                        session_id = $session_id
            	    WHERE
            	        c_id = ".$course_id." AND
            	        (link='$link' and image='scormbuilder.gif' $session_condition)
                    ";
            Database::query($sql);
        } else {
            // Parameter and database incompatible, do nothing, exit.
            return false;
        }

    }

    /**
     * Restart the whole learnpath. Return the URL of the first element.
     * Make sure the results are saved with anoter method. This method should probably be
     * redefined in children classes.
     * To use a similar method  statically, use the create_new_attempt() method
     * @return string URL to load in the viewer
     */
    public function restart()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::restart()', 0);
        }
        // TODO
        // Call autosave method to save the current progress.
        //$this->index = 0;
        if (api_is_invitee()) {
            return false;
        }
        $session_id = api_get_session_id();
        $course_id = api_get_course_int_id();
        $lp_view_table = Database :: get_course_table(TABLE_LP_VIEW);
        $sql = "INSERT INTO $lp_view_table (c_id, lp_id, user_id, view_count, session_id)
                VALUES ($course_id, " . $this->lp_id . "," . $this->get_user_id() . "," . ($this->attempt + 1) . ", $session_id)";
        if ($this->debug > 2) {
            error_log('New LP - Inserting new lp_view for restart: ' . $sql, 0);
        }
        $res = Database::query($sql);
        $view_id = Database::insert_id();

        if ($view_id) {

            $sql = "UPDATE $lp_view_table SET id = iid WHERE iid = $view_id";
            Database::query($sql);

            $this->lp_view_id = $view_id;
            $this->attempt = $this->attempt + 1;
        } else {
            $this->error = 'Could not insert into item_view table...';
            return false;
        }
        $this->autocomplete_parents($this->current);
        foreach ($this->items as $index => $dummy) {
            $this->items[$index]->restart();
            $this->items[$index]->set_lp_view($this->lp_view_id);
        }
        $this->first();

        return true;
    }

    /**
     * Saves the current item
     * @return	boolean
     */
    public function save_current()
    {
        if ($this->debug > 0) {
            error_log('learnpath::save_current()', 0);
        }
        // TODO: Do a better check on the index pointing to the right item (it is supposed to be working
        // on $ordered_items[] but not sure it's always safe to use with $items[]).
        if ($this->debug > 2) {
            error_log('New LP - save_current() saving item ' . $this->current, 0);
        }
        if ($this->debug > 2) {
            error_log('' . print_r($this->items, true), 0);
        }
        if (isset($this->items[$this->current]) &&
            is_object($this->items[$this->current])
        ) {
            $res = $this->items[$this->current]->save(false, $this->prerequisites_match($this->current));
            $this->autocomplete_parents($this->current);
            $status = $this->items[$this->current]->get_status();
            $this->append_message('new_item_status: ' . $status);
            $this->update_queue[$this->current] = $status;
            return $res;
        }
        return false;
    }

    /**
     * Saves the given item
     * @param	integer	$item_id. Optional (will take from $_REQUEST if null)
     * @param	boolean	$from_outside Save from url params (true) or from current attributes (false). Optional. Defaults to true
     * @return	boolean
     */
    public function save_item($item_id = null, $from_outside = true)
    {
        $debug = $this->debug;
        if ($debug) {
            error_log('In learnpath::save_item(' . $item_id . ',' . intval($from_outside). ')', 0);
        }
        // TODO: Do a better check on the index pointing to the right item (it is supposed to be working
        // on $ordered_items[] but not sure it's always safe to use with $items[]).
        if (empty($item_id)) {
            $item_id = intval($_REQUEST['id']);
        }
        if (empty($item_id)) {
            $item_id = $this->get_current_item_id();
        }
        if (isset($this->items[$item_id]) && is_object($this->items[$item_id])) {
            if ($debug) {
                error_log('Object exists');
            }

            // Saving the item.
            $res = $this->items[$item_id]->save(
                $from_outside,
                $this->prerequisites_match($item_id)
            );

            if ($debug) {
                error_log('update_queue before:');
                error_log(print_r($this->update_queue,1));
            }
            $this->autocomplete_parents($item_id);

            $status = $this->items[$item_id]->get_status();
            $this->update_queue[$item_id] = $status;

            if ($debug) {
                error_log('get_status(): ' . $status);
                error_log('update_queue after:');
                error_log(print_r($this->update_queue,1));
            }
            return $res;
        }
        return false;
    }

    /**
     * Saves the last item seen's ID only in case
     */
    public function save_last()
    {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::save_last()', 0);
        }
        $session_condition = api_get_session_condition(api_get_session_id(), true, false);
        $table = Database :: get_course_table(TABLE_LP_VIEW);

        if (isset($this->current) && !api_is_invitee()) {
            if ($this->debug > 2) {
                error_log('New LP - Saving current item (' . $this->current . ') for later review', 0);
            }
            $sql = "UPDATE $table SET
                        last_item = " . intval($this->get_current_item_id()). "
                    WHERE
                        c_id = $course_id AND
                        lp_id = " . $this->get_id() . " AND
                        user_id = " . $this->get_user_id()." ".$session_condition;

            if ($this->debug > 2) {
                error_log('New LP - Saving last item seen : ' . $sql, 0);
            }
            Database::query($sql);
        }

        if (!api_is_invitee()) {
            // Save progress.
            list($progress, $text) = $this->get_progress_bar_text('%');
            if ($progress >= 0 && $progress <= 100) {
                $progress = (int) $progress;
                $sql = "UPDATE $table SET
                            progress = $progress
                        WHERE
                            c_id = ".$course_id." AND
                            lp_id = " . $this->get_id() . " AND
                            user_id = " . $this->get_user_id()." ".$session_condition;
                // Ignore errors as some tables might not have the progress field just yet.
                Database::query($sql);
                $this->progress_db = $progress;
            }
        }
    }

    /**
     * Sets the current item ID (checks if valid and authorized first)
     * @param	integer	$item_id New item ID. If not given or not authorized, defaults to current
     */
    public function set_current_item($item_id = null)
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::set_current_item(' . $item_id . ')', 0);
        }
        if (empty ($item_id)) {
            if ($this->debug > 2) {
                error_log('New LP - No new current item given, ignore...', 0);
            }
            // Do nothing.
        } else {
            if ($this->debug > 2) {
                error_log('New LP - New current item given is ' . $item_id . '...', 0);
            }
            if (is_numeric($item_id)) {
                $item_id = intval($item_id);
                // TODO: Check in database here.
                $this->last = $this->current;
                $this->current = $item_id;
                // TODO: Update $this->index as well.
                foreach ($this->ordered_items as $index => $item) {
                    if ($item == $this->current) {
                        $this->index = $index;
                        break;
                    }
                }
                if ($this->debug > 2) {
                    error_log('New LP - set_current_item(' . $item_id . ') done. Index is now : ' . $this->index, 0);
                }
            } else {
                error_log('New LP - set_current_item(' . $item_id . ') failed. Not a numeric value: ', 0);
            }
        }
    }

    /**
     * Sets the encoding
     * @param	string	New encoding
     * TODO (as of Chamilo 1.8.8): Check in the future whether this method is needed.
     */
    public function set_encoding($enc = 'UTF-8')
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::set_encoding()', 0);
        }

        $course_id = api_get_course_int_id();
        $enc = api_refine_encoding_id($enc);
        if (empty($enc)) {
            $enc = api_get_system_encoding();
        }
        if (api_is_encoding_supported($enc)) {
            $lp = $this->get_id();
            if ($lp != 0) {
                $tbl_lp = Database :: get_course_table(TABLE_LP_MAIN);
                $sql = "UPDATE $tbl_lp SET default_encoding = '$enc' WHERE c_id = ".$course_id." AND id = " . $lp;
                $res = Database::query($sql);
                return $res;
            }
        }
        return false;
    }

    /**
     * Sets the JS lib setting in the database directly.
     * This is the JavaScript library file this lp needs to load on startup
     * @param	string	Proximity setting
     * @return  boolean True on update success. False otherwise.
     */
    public function set_jslib($lib = '')
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::set_jslib()', 0);
        }
        $lp = $this->get_id();
        $course_id = api_get_course_int_id();

        if ($lp != 0) {
            $tbl_lp = Database :: get_course_table(TABLE_LP_MAIN);
            $sql = "UPDATE $tbl_lp SET js_lib = '$lib' WHERE c_id = ".$course_id." AND id = " . $lp;
            $res = Database::query($sql);
            return $res;
        } else {
            return false;
        }
    }

    /**
     * Sets the name of the LP maker (publisher) (and save)
     * @param	string	Optional string giving the new content_maker of this learnpath
     * @return  boolean True
     */
    public function set_maker($name = '')
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::set_maker()', 0);
        }
        if (empty ($name))
            return false;
        $this->maker = $name;
        $lp_table = Database :: get_course_table(TABLE_LP_MAIN);
        $course_id = api_get_course_int_id();
        $lp_id = $this->get_id();
        $sql = "UPDATE $lp_table SET
                content_maker = '" . Database::escape_string($this->maker) . "'
                WHERE c_id = ".$course_id." AND id = '$lp_id'";
        if ($this->debug > 2) {
            error_log('New LP - lp updated with new content_maker : ' . $this->maker, 0);
        }
        Database::query($sql);
        return true;
    }

    /**
     * Sets the name of the current learnpath (and save)
     * @param	string	$name Optional string giving the new name of this learnpath
     * @return  boolean True/False
     */
    public function set_name($name = null)
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::set_name()', 0);
        }
        if (empty($name)) {
            return false;
        }
        $this->name = $name;
        $lp_table = Database :: get_course_table(TABLE_LP_MAIN);
        $lp_id = $this->get_id();
        $course_id = api_get_course_int_id();
        $sql = "UPDATE $lp_table SET
                name = '" . Database::escape_string($this->name). "'
                WHERE c_id = ".$course_id." AND id = '$lp_id'";
        if ($this->debug > 2) {
            error_log('New LP - lp updated with new name : ' . $this->name, 0);
        }
        $result = Database::query($sql);
        // If the lp is visible on the homepage, change his name there.
        if (Database::affected_rows($result)) {
            $session_id = api_get_session_id();
            $session_condition = api_get_session_condition($session_id);
            $tbl_tool = Database :: get_course_table(TABLE_TOOL_LIST);
            $link = 'newscorm/lp_controller.php?action=view&lp_id=' . $lp_id.'&id_session='.$session_id;
            $sql = "UPDATE $tbl_tool SET name = '$this->name'
            	    WHERE
            	        c_id = $course_id AND
            	        (link='$link' AND image='scormbuilder.gif' $session_condition)";
            Database::query($sql);
            return true;
        } else {
            return false;
        }
    }

    /**
     * Set index specified prefix terms for all items in this path
     * @param   string  Comma-separated list of terms
     * @param   char Xapian term prefix
     * @return  boolean False on error, true otherwise
     */
    public function set_terms_by_prefix($terms_string, $prefix)
    {
        $course_id = api_get_course_int_id();
        if (api_get_setting('search_enabled') !== 'true')
            return false;

        if (!extension_loaded('xapian')) {
            return false;
        }

        $terms_string = trim($terms_string);
        $terms = explode(',', $terms_string);
        array_walk($terms, 'trim_value');

        $stored_terms = $this->get_common_index_terms_by_prefix($prefix);

        // Don't do anything if no change, verify only at DB, not the search engine.
        if ((count(array_diff($terms, $stored_terms)) == 0) && (count(array_diff($stored_terms, $terms)) == 0))
            return false;

        require_once 'xapian.php'; // TODO: Try catch every xapian use or make wrappers on API.
        require_once api_get_path(LIBRARY_PATH).'search/ChamiloIndexer.class.php';
        require_once api_get_path(LIBRARY_PATH).'search/xapian/XapianQuery.php';
        require_once api_get_path(LIBRARY_PATH).'search/IndexableChunk.class.php';

        $items_table = Database :: get_course_table(TABLE_LP_ITEM);
        // TODO: Make query secure agains XSS : use member attr instead of post var.
        $lp_id = intval($_POST['lp_id']);
        $sql = "SELECT * FROM $items_table WHERE c_id = $course_id AND lp_id = $lp_id";
        $result = Database::query($sql);
        $di = new ChamiloIndexer();

        while ($lp_item = Database :: fetch_array($result)) {
            // Get search_did.
            $tbl_se_ref = Database :: get_main_table(TABLE_MAIN_SEARCH_ENGINE_REF);
            $sql = 'SELECT * FROM %s
                    WHERE course_code=\'%s\' AND tool_id=\'%s\' AND ref_id_high_level=%s AND ref_id_second_level=%d
                    LIMIT 1';
            $sql = sprintf($sql, $tbl_se_ref, $this->cc, TOOL_LEARNPATH, $lp_id, $lp_item['id']);

            //echo $sql; echo '<br>';
            $res = Database::query($sql);
            if (Database::num_rows($res) > 0) {
                $se_ref = Database :: fetch_array($res);

                // Compare terms.
                $doc = $di->get_document($se_ref['search_did']);
                $xapian_terms = xapian_get_doc_terms($doc, $prefix);
                $xterms = array();
                foreach ($xapian_terms as $xapian_term) {
                    $xterms[] = substr($xapian_term['name'], 1);
                }

                $dterms = $terms;

                $missing_terms = array_diff($dterms, $xterms);
                $deprecated_terms = array_diff($xterms, $dterms);

                // Save it to search engine.
                foreach ($missing_terms as $term) {
                    $doc->add_term($prefix . $term, 1);
                }
                foreach ($deprecated_terms as $term) {
                    $doc->remove_term($prefix . $term);
                }
                $di->getDb()->replace_document((int) $se_ref['search_did'], $doc);
                $di->getDb()->flush();
            } else {
                //@todo What we should do here?
            }
        }
        return true;
    }

    /**
     * Sets the theme of the LP (local/remote) (and save)
     * @param	string	Optional string giving the new theme of this learnpath
     * @return   bool    Returns true if theme name is not empty
     */
    public function set_theme($name = '')
    {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::set_theme()', 0);
        }
        $this->theme = $name;
        $lp_table = Database :: get_course_table(TABLE_LP_MAIN);
        $lp_id = $this->get_id();
        $sql = "UPDATE $lp_table SET theme = '" . Database::escape_string($this->theme). "'
                WHERE c_id = ".$course_id." AND id = '$lp_id'";
        if ($this->debug > 2) {
            error_log('New LP - lp updated with new theme : ' . $this->theme, 0);
        }
        Database::query($sql);

        return true;
    }

    /**
     * Sets the image of an LP (and save)
     * @param	 string	Optional string giving the new image of this learnpath
     * @return bool   Returns true if theme name is not empty
     */
    public function set_preview_image($name = '')
    {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::set_preview_image()', 0);
        }

        $this->preview_image = $name;
        $lp_table = Database :: get_course_table(TABLE_LP_MAIN);
        $lp_id = $this->get_id();
        $sql = "UPDATE $lp_table SET
                preview_image = '" . Database::escape_string($this->preview_image). "'
                WHERE c_id = ".$course_id." AND id = '$lp_id'";
        if ($this->debug > 2) {
            error_log('New LP - lp updated with new preview image : ' . $this->preview_image, 0);
        }
        Database::query($sql);
        return true;
    }

    /**
     * Sets the author of a LP (and save)
     * @param	string	Optional string giving the new author of this learnpath
     * @return   bool    Returns true if author's name is not empty
     */
    public function set_author($name = '')
    {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::set_author()', 0);
        }
        $this->author = $name;
        $lp_table = Database :: get_course_table(TABLE_LP_MAIN);
        $lp_id = $this->get_id();
        $sql = "UPDATE $lp_table SET author = '" . Database::escape_string($name). "'
                WHERE c_id = ".$course_id." AND id = '$lp_id'";
        if ($this->debug > 2) {
            error_log('New LP - lp updated with new preview author : ' . $this->author, 0);
        }
        Database::query($sql);

        return true;
    }

    /**
     * Sets the hide_toc_frame parameter of a LP (and save)
     * @param	int	1 if frame is hidden 0 then else
     * @return   bool    Returns true if author's name is not empty
     */
    public function set_hide_toc_frame($hide)
    {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::set_hide_toc_frame()', 0);
        }
        if (intval($hide) == $hide){
            $this->hide_toc_frame = $hide;
            $lp_table = Database :: get_course_table(TABLE_LP_MAIN);
            $lp_id = $this->get_id();
            $sql = "UPDATE $lp_table SET
                    hide_toc_frame = '" . $this->hide_toc_frame . "'
                    WHERE c_id = ".$course_id." AND id = '$lp_id'";
            if ($this->debug > 2) {
                error_log('New LP - lp updated with new preview hide_toc_frame : ' . $this->author, 0);
            }
            Database::query($sql);

            return true;
        } else {
            return false;
        }
    }

    /**
     * Sets the prerequisite of a LP (and save)
     * @param	int		integer giving the new prerequisite of this learnpath
     * @return 	bool 	returns true if prerequisite is not empty
     */
    public function set_prerequisite($prerequisite)
    {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::set_prerequisite()', 0);
        }
        $this->prerequisite = intval($prerequisite);
        $lp_table = Database :: get_course_table(TABLE_LP_MAIN);
        $lp_id = $this->get_id();
        $sql = "UPDATE $lp_table SET prerequisite = '".$this->prerequisite."'
                WHERE c_id = ".$course_id." AND id = '$lp_id'";
        if ($this->debug > 2) {
            error_log('New LP - lp updated with new preview requisite : ' . $this->requisite, 0);
        }
        Database::query($sql);
        return true;
    }

    /**
     * Sets the location/proximity of the LP (local/remote) (and save)
     * @param	string	Optional string giving the new location of this learnpath
     * @return  boolean True on success / False on error
     */
    public function set_proximity($name = '')
    {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::set_proximity()', 0);
        }
        if (empty ($name))
            return false;

        $this->proximity = $name;
        $lp_table = Database :: get_course_table(TABLE_LP_MAIN);
        $lp_id = $this->get_id();
        $sql = "UPDATE $lp_table SET
                    content_local = '" . Database::escape_string($name) . "'
                WHERE c_id = ".$course_id." AND id = '$lp_id'";
        if ($this->debug > 2) {
            error_log('New LP - lp updated with new proximity : ' . $this->proximity, 0);
        }
        Database::query($sql);
        return true;
    }

    /**
     * Sets the previous item ID to a given ID. Generally, this should be set to the previous 'current' item
     * @param	integer	DB ID of the item
     */
    public function set_previous_item($id)
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::set_previous_item()', 0);
        }
        $this->last = $id;
    }

    /**
     * Sets use_max_score
     * @param   string  $use_max_score Optional string giving the new location of this learnpath
     * @return  boolean True on success / False on error
     */
    public function set_use_max_score($use_max_score = 1)
    {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::set_use_max_score()', 0);
        }
        $use_max_score = intval($use_max_score);
        $this->use_max_score = $use_max_score;
        $lp_table = Database :: get_course_table(TABLE_LP_MAIN);
        $lp_id = $this->get_id();
        $sql = "UPDATE $lp_table SET
                    use_max_score = '" . $this->use_max_score . "'
                WHERE c_id = ".$course_id." AND id = '$lp_id'";

        if ($this->debug > 2) {
            error_log('New LP - lp updated with new use_max_score : ' . $this->use_max_score, 0);
        }
        Database::query($sql);

        return true;
    }

    /**
     * Sets and saves the expired_on date
     * @param   string  $expired_on Optional string giving the new author of this learnpath
     * @return   bool    Returns true if author's name is not empty
     */
    public function set_expired_on($expired_on)
    {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::set_expired_on()', 0);
        }

        if (!empty($expired_on)) {
            $this->expired_on = api_get_utc_datetime($expired_on);
        } else {
            $this->expired_on = '';
        }
        $lp_table = Database :: get_course_table(TABLE_LP_MAIN);
        $lp_id = $this->get_id();
        $sql = "UPDATE $lp_table SET
                expired_on = '" . Database::escape_string($this->expired_on) . "'
                WHERE c_id = ".$course_id." AND id = '$lp_id'";
        if ($this->debug > 2) {
            error_log('New LP - lp updated with new expired_on : ' . $this->expired_on, 0);
        }
        Database::query($sql);

        return true;
    }

    /**
     * Sets and saves the publicated_on date
     * @param   string  $publicated_on Optional string giving the new author of this learnpath
     * @return   bool    Returns true if author's name is not empty
     */
    public function set_publicated_on($publicated_on)
    {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::set_expired_on()', 0);
        }
        if (!empty($publicated_on)) {
            $this->publicated_on = api_get_utc_datetime($publicated_on);
        } else {
            $this->publicated_on = '';
        }
        $lp_table = Database :: get_course_table(TABLE_LP_MAIN);
        $lp_id = $this->get_id();
        $sql = "UPDATE $lp_table SET
                publicated_on = '" . Database::escape_string($this->publicated_on) . "'
                WHERE c_id = ".$course_id." AND id = '$lp_id'";
        if ($this->debug > 2) {
            error_log('New LP - lp updated with new publicated_on : ' . $this->publicated_on, 0);
        }
        Database::query($sql);

        return true;
    }

    /**
     * Sets and saves the expired_on date
     * @return   bool    Returns true if author's name is not empty
     */
    public function set_modified_on()
    {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::set_expired_on()', 0);
        }
        $this->modified_on = api_get_utc_datetime();
        $lp_table = Database :: get_course_table(TABLE_LP_MAIN);
        $lp_id = $this->get_id();
        $sql = "UPDATE $lp_table SET modified_on = '" . $this->modified_on . "'
                WHERE c_id = ".$course_id." AND id = '$lp_id'";
        if ($this->debug > 2) {
            error_log('New LP - lp updated with new expired_on : ' . $this->modified_on, 0);
        }
        Database::query($sql);
        return true;
    }

    /**
     * Sets the object's error message
     * @param	string	Error message. If empty, reinits the error string
     * @return 	void
     */
    public function set_error_msg($error = '')
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::set_error_msg()', 0);
        }
        if (empty ($error)) {
            $this->error = '';
        } else {
            $this->error .= $error;
        }
    }

    /**
     * Launches the current item if not 'sco'
     * (starts timer and make sure there is a record ready in the DB)
     * @param  boolean  $allow_new_attempt Whether to allow a new attempt or not
     * @return boolean
     */
    public function start_current_item($allow_new_attempt = false)
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::start_current_item()', 0);
        }
        if ($this->current != 0 && is_object($this->items[$this->current])) {
            $type = $this->get_type();
            $item_type = $this->items[$this->current]->get_type();
            if (($type == 2 && $item_type != 'sco') ||
                ($type == 3 && $item_type != 'au') ||
                ($type == 1 && $item_type != TOOL_QUIZ && $item_type != TOOL_HOTPOTATOES)
            ) {
                $this->items[$this->current]->open($allow_new_attempt);
                $this->autocomplete_parents($this->current);
                $prereq_check = $this->prerequisites_match($this->current);
                $this->items[$this->current]->save(false, $prereq_check);
                //$this->update_queue[$this->last] = $this->items[$this->last]->get_status();
            } else {
                // If sco, then it is supposed to have been updated by some other call.
            }
            if ($item_type == 'sco') {
                $this->items[$this->current]->restart();
            }
        }
        if ($this->debug > 0) {
            error_log('New LP - End of learnpath::start_current_item()', 0);
        }
        return true;
    }

    /**
     * Stops the processing and counters for the old item (as held in $this->last)
     * @return boolean  True/False
     */
    public function stop_previous_item()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::stop_previous_item()', 0);
        }

        if ($this->last != 0 && $this->last != $this->current && is_object($this->items[$this->last])) {
            if ($this->debug > 2) {
                error_log('New LP - In learnpath::stop_previous_item() - ' . $this->last . ' is object', 0);
            }
            switch ($this->get_type()) {
                case '3' :
                    if ($this->items[$this->last]->get_type() != 'au') {
                        if ($this->debug > 2) {
                            error_log('New LP - In learnpath::stop_previous_item() - ' . $this->last . ' in lp_type 3 is <> au', 0);
                        }
                        $this->items[$this->last]->close();
                        //$this->autocomplete_parents($this->last);
                        //$this->update_queue[$this->last] = $this->items[$this->last]->get_status();
                    } else {
                        if ($this->debug > 2) {
                            error_log('New LP - In learnpath::stop_previous_item() - Item is an AU, saving is managed by AICC signals', 0);
                        }
                    }
                case '2' :
                    if ($this->items[$this->last]->get_type() != 'sco') {
                        if ($this->debug > 2) {
                            error_log('New LP - In learnpath::stop_previous_item() - ' . $this->last . ' in lp_type 2 is <> sco', 0);
                        }
                        $this->items[$this->last]->close();
                        //$this->autocomplete_parents($this->last);
                        //$this->update_queue[$this->last] = $this->items[$this->last]->get_status();
                    } else {
                        if ($this->debug > 2) {
                            error_log('New LP - In learnpath::stop_previous_item() - Item is a SCO, saving is managed by SCO signals', 0);
                        }
                    }
                    break;
                case '1' :
                default :
                    if ($this->debug > 2) {
                        error_log('New LP - In learnpath::stop_previous_item() - ' . $this->last . ' in lp_type 1 is asset', 0);
                    }
                    $this->items[$this->last]->close();
                    break;
            }
        } else {
            if ($this->debug > 2) {
                error_log('New LP - In learnpath::stop_previous_item() - No previous element found, ignoring...', 0);
            }
            return false;
        }
        return true;
    }

    /**
     * Updates the default view mode from fullscreen to embedded and inversely
     * @return	string The current default view mode ('fullscreen' or 'embedded')
     */
    public function update_default_view_mode()
    {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::update_default_view_mode()', 0);
        }
        $lp_table = Database :: get_course_table(TABLE_LP_MAIN);
        $sql = "SELECT * FROM $lp_table
                WHERE c_id = ".$course_id." AND id = " . $this->get_id();
        $res = Database::query($sql);
        if (Database :: num_rows($res) > 0) {
            $row = Database :: fetch_array($res);
            $default_view_mode = $row['default_view_mod'];
            $view_mode = $default_view_mode;
            switch ($default_view_mode) {
                case 'fullscreen':
                    $view_mode = 'embedded';
                    break;
                case 'embedded':
                    $view_mode = 'embedframe';
                    break;
                case 'embedframe':
                    $view_mode = 'impress';
                    break;
                case 'impress':
                    $view_mode = 'fullscreen';
                    break;
            }
            $sql = "UPDATE $lp_table SET default_view_mod = '$view_mode'
                    WHERE c_id = ".$course_id." AND id = " . $this->get_id();
            Database::query($sql);
            $this->mode = $view_mode;

            return $view_mode;
        } else {
            if ($this->debug > 2) {
                error_log('New LP - Problem in update_default_view() - could not find LP ' . $this->get_id() . ' in DB', 0);
            }
        }
        return -1;
    }

    /**
     * Updates the default behaviour about auto-commiting SCORM updates
     * @return	boolean	True if auto-commit has been set to 'on', false otherwise
     */
    public function update_default_scorm_commit()
    {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::update_default_scorm_commit()', 0);
        }
        $lp_table = Database :: get_course_table(TABLE_LP_MAIN);
        $sql = "SELECT * FROM $lp_table
                WHERE c_id = ".$course_id." AND id = " . $this->get_id();
        $res = Database::query($sql);
        if (Database :: num_rows($res) > 0) {
            $row = Database :: fetch_array($res);
            $force = $row['force_commit'];
            if ($force == 1) {
                $force = 0;
                $force_return = false;
            } elseif ($force == 0) {
                $force = 1;
                $force_return = true;
            }
            $sql = "UPDATE $lp_table SET force_commit = $force
                    WHERE c_id = ".$course_id." AND id = " . $this->get_id();
            Database::query($sql);
            $this->force_commit = $force_return;

            return $force_return;
        } else {
            if ($this->debug > 2) {
                error_log('New LP - Problem in update_default_scorm_commit() - could not find LP ' . $this->get_id() . ' in DB', 0);
            }
        }
        return -1;
    }

    /**
     * Updates the order of learning paths (goes through all of them by order and fills the gaps)
     * @return	bool	True on success, false on failure
     */
    public function update_display_order()
    {
        $course_id = api_get_course_int_id();
        $lp_table = Database :: get_course_table(TABLE_LP_MAIN);

        $sql = "SELECT * FROM $lp_table WHERE c_id = ".$course_id." ORDER BY display_order";
        $res = Database::query($sql);
        if ($res === false)
            return false;

        $num = Database :: num_rows($res);
        // First check the order is correct, globally (might be wrong because
        // of versions < 1.8.4).
        if ($num > 0) {
            $i = 1;
            while ($row = Database :: fetch_array($res)) {
                if ($row['display_order'] != $i) { // If we find a gap in the order, we need to fix it.
                    $need_fix = true;
                    $sql = "UPDATE $lp_table SET display_order = $i
                            WHERE c_id = ".$course_id." AND id = " . $row['id'];
                    Database::query($sql);
                }
                $i++;
            }
        }
        return true;
    }

    /**
     * Updates the "prevent_reinit" value that enables control on reinitialising items on second view
     * @return	boolean	True if prevent_reinit has been set to 'on', false otherwise (or 1 or 0 in this case)
     */
    public function update_reinit()
    {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::update_reinit()', 0);
        }
        $lp_table = Database :: get_course_table(TABLE_LP_MAIN);
        $sql = "SELECT * FROM $lp_table WHERE c_id = ".$course_id." AND id = " . $this->get_id();
        $res = Database::query($sql);
        if (Database :: num_rows($res) > 0) {
            $row = Database :: fetch_array($res);
            $force = $row['prevent_reinit'];
            if ($force == 1) {
                $force = 0;
            } elseif ($force == 0) {
                $force = 1;
            }
            $sql = "UPDATE $lp_table SET prevent_reinit = $force
                    WHERE c_id = ".$course_id." AND id = " . $this->get_id();
            Database::query($sql);
            $this->prevent_reinit = $force;
            return $force;
        } else {
            if ($this->debug > 2) {
                error_log('New LP - Problem in update_reinit() - could not find LP ' . $this->get_id() . ' in DB', 0);
            }
        }
        return -1;
    }

    /**
     * Determine the attempt_mode thanks to prevent_reinit and seriousgame_mode db flag
     *
     * @return string 'single', 'multi' or 'seriousgame'
     * @author ndiechburg <noel@cblue.be>
     **/
    public function get_attempt_mode()
    {
        //Set default value for seriousgame_mode
        if (!isset($this->seriousgame_mode)) {
            $this->seriousgame_mode=0;
        }
        // Set default value for prevent_reinit
        if (!isset($this->prevent_reinit)) {
            $this->prevent_reinit =1;
        }
        if ($this->seriousgame_mode == 1 && $this->prevent_reinit == 1) {
            return 'seriousgame';
        }
        if ($this->seriousgame_mode == 0 && $this->prevent_reinit == 1) {
            return 'single';
        }
        if ($this->seriousgame_mode == 0 && $this->prevent_reinit == 0) {
            return 'multiple';
        }
        return 'single';
    }

    /**
     * Register the attempt mode into db thanks to flags prevent_reinit and seriousgame_mode flags
     *
     * @param string 'seriousgame', 'single' or 'multiple'
     * @return boolean
     * @author ndiechburg <noel@cblue.be>
     **/
    public function set_attempt_mode($mode)
    {
        $course_id = api_get_course_int_id();
        switch ($mode) {
            case 'seriousgame' :
                $sg_mode = 1;
                $prevent_reinit = 1;
                break;
            case 'single' :
                $sg_mode = 0;
                $prevent_reinit = 1;
                break;
            case 'multiple' :
                $sg_mode = 0;
                $prevent_reinit = 0;
                break;
            default :
                $sg_mode = 0;
                $prevent_reinit = 0;
                break;
        }
        $this->prevent_reinit = $prevent_reinit;
        $this->seriousgame_mode = $sg_mode;
        $lp_table = Database :: get_course_table(TABLE_LP_MAIN);
        $sql = "UPDATE $lp_table SET
                prevent_reinit = $prevent_reinit ,
                seriousgame_mode = $sg_mode
                WHERE c_id = ".$course_id." AND id = " . $this->get_id();
        $res = Database::query($sql);
        if ($res) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * Switch between multiple attempt, single attempt or serious_game mode (only for scorm)
     *
     * @return boolean
     * @author ndiechburg <noel@cblue.be>
     **/
    public function switch_attempt_mode()
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::switch_attempt_mode()', 0);
        }
        $mode = $this->get_attempt_mode();
        switch ($mode) {
            case 'single' :
                $next_mode = 'multiple';
                break;
            case 'multiple' :
                $next_mode = 'seriousgame';
                break;
            case 'seriousgame' :
                $next_mode = 'single';
                break;
            default :
                $next_mode = 'single';
                break;
        }
        $this->set_attempt_mode($next_mode);
    }

    /**
     * Switch the lp in ktm mode. This is a special scorm mode with unique attempt
     * but possibility to do again a completed item.
     *
     * @return boolean true if seriousgame_mode has been set to 1, false otherwise
     * @author ndiechburg <noel@cblue.be>
     **/
    public function set_seriousgame_mode()
    {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::set_seriousgame_mode()', 0);
        }
        $lp_table = Database :: get_course_table(TABLE_LP_MAIN);
        $sql = "SELECT * FROM $lp_table WHERE c_id = ".$course_id." AND id = " . $this->get_id();
        $res = Database::query($sql);
        if (Database :: num_rows($res) > 0) {
            $row = Database :: fetch_array($res);
            $force = $row['seriousgame_mode'];
            if ($force == 1) {
                $force = 0;
            } elseif ($force == 0) {
                $force = 1;
            }
            $sql = "UPDATE $lp_table SET seriousgame_mode = $force
			        WHERE c_id = ".$course_id." AND id = " . $this->get_id();
            Database::query($sql);
            $this->seriousgame_mode = $force;
            return $force;
        } else {
            if ($this->debug > 2) {
                error_log('New LP - Problem in set_seriousgame_mode() - could not find LP ' . $this->get_id() . ' in DB', 0);
            }
        }
        return -1;
    }

    /**
     * Updates the "scorm_debug" value that shows or hide the debug window
     * @return	boolean	True if scorm_debug has been set to 'on', false otherwise (or 1 or 0 in this case)
     */
    public function update_scorm_debug()
    {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::update_scorm_debug()', 0);
        }
        $lp_table = Database :: get_course_table(TABLE_LP_MAIN);
        $sql = "SELECT * FROM $lp_table
                WHERE c_id = ".$course_id." AND id = " . $this->get_id();
        $res = Database::query($sql);
        if (Database :: num_rows($res) > 0) {
            $row = Database :: fetch_array($res);
            $force = $row['debug'];
            if ($force == 1) {
                $force = 0;
            } elseif ($force == 0) {
                $force = 1;
            }
            $sql = "UPDATE $lp_table SET debug = $force
                    WHERE c_id = ".$course_id." AND id = " . $this->get_id();
            $res = Database::query($sql);
            $this->scorm_debug = $force;
            return $force;
        } else {
            if ($this->debug > 2) {
                error_log('New LP - Problem in update_scorm_debug() - could not find LP ' . $this->get_id() . ' in DB', 0);
            }
        }
        return -1;
    }

    /**
     * Function that makes a call to the function sort_tree_array and create_tree_array
     * @author Kevin Van Den Haute
     * @param  array
     */
    public function tree_array($array)
    {
        if ($this->debug > 1) {
            error_log('New LP - In learnpath::tree_array()', 0);
        }
        $array = $this->sort_tree_array($array);
        $this->create_tree_array($array);
    }

    /**
     * Creates an array with the elements of the learning path tree in it
     *
     * @author Kevin Van Den Haute
     * @param array $array
     * @param int $parent
     * @param int $depth
     * @param array $tmp
     */
    public function create_tree_array($array, $parent = 0, $depth = -1, $tmp = array ())
    {
        if ($this->debug > 1) {
            error_log('New LP - In learnpath::create_tree_array())', 0);
        }

        if (is_array($array)) {
            for ($i = 0; $i < count($array); $i++) {
                if ($array[$i]['parent_item_id'] == $parent) {
                    if (!in_array($array[$i]['parent_item_id'], $tmp)) {
                        $tmp[] = $array[$i]['parent_item_id'];
                        $depth++;
                    }
                    $preq = (empty($array[$i]['prerequisite']) ? '' : $array[$i]['prerequisite']);
                    $audio = isset($array[$i]['audio']) ? $array[$i]['audio'] : null;
                    $path = isset($array[$i]['path']) ? $array[$i]['path'] : null;

                    $prerequisiteMinScore = isset($array[$i]['prerequisite_min_score']) ? $array[$i]['prerequisite_min_score'] : null;
                    $prerequisiteMaxScore = isset($array[$i]['prerequisite_max_score']) ? $array[$i]['prerequisite_max_score'] : null;
                    $ref = isset($array[$i]['ref']) ? $array[$i]['ref'] : '';
                    $this->arrMenu[] = array(
                        'id' => $array[$i]['id'],
                        'ref' => $ref,
                        'item_type' => $array[$i]['item_type'],
                        'title' => $array[$i]['title'],
                        'path' => $path,
                        'description' => $array[$i]['description'],
                        'parent_item_id' => $array[$i]['parent_item_id'],
                        'previous_item_id' => $array[$i]['previous_item_id'],
                        'next_item_id' => $array[$i]['next_item_id'],
                        'min_score' => $array[$i]['min_score'],
                        'max_score' => $array[$i]['max_score'],
                        'mastery_score' => $array[$i]['mastery_score'],
                        'display_order' => $array[$i]['display_order'],
                        'prerequisite' => $preq,
                        'depth' => $depth,
                        'audio' => $audio,
                        'prerequisite_min_score' => $prerequisiteMinScore,
                        'prerequisite_max_score' => $prerequisiteMaxScore
                    );

                    $this->create_tree_array($array, $array[$i]['id'], $depth, $tmp);
                }
            }
        }
    }

    /**
     * Sorts a multi dimensional array by parent id and display order
     * @author Kevin Van Den Haute
     *
     * @param array $array (array with al the learning path items in it)
     *
     * @return array
     */
    public function sort_tree_array($array) {
        foreach ($array as $key => $row) {
            $parent[$key] = $row['parent_item_id'];
            $position[$key] = $row['display_order'];
        }

        if (count($array) > 0)
            array_multisort($parent, SORT_ASC, $position, SORT_ASC, $array);

        return $array;
    }

    /**
     * Function that creates a html list of learning path items so that we can add audio files to them
     * @author Kevin Van Den Haute
     * @param int $lp_id
     * @return string
     */
    public function overview()
    {
        $is_allowed_to_edit = api_is_allowed_to_edit(null,true);
        $_course = api_get_course_info();

        if ($this->debug > 0) {
            error_log('New LP - In learnpath::overview()', 0);
        }

        $_SESSION['gradebook'] = isset($_GET['gradebook']) ? Security :: remove_XSS($_GET['gradebook']) : null;
        $return = '';

        $update_audio = isset($_GET['updateaudio']) ? $_GET['updateaudio'] : null;

        // we need to start a form when we want to update all the mp3 files
        if ($update_audio == 'true') {
            $return .= '<form action="' . api_get_self() . '?cidReq=' . Security :: remove_XSS($_GET['cidReq']) . '&updateaudio=' . Security :: remove_XSS($_GET['updateaudio']) .'&action=' . Security :: remove_XSS($_GET['action']) . '&lp_id=' . $_SESSION['oLP']->lp_id . '" method="post" enctype="multipart/form-data" name="updatemp3" id="updatemp3">';
        }
        $return .= '<div id="message"></div>';
        if (count($this->items) == 0) {
            $return .= Display::display_normal_message(get_lang('YouShouldAddItemsBeforeAttachAudio'));
        } else {
            $return_audio = '<table class="data_table">';
            $return_audio .= '<tr>';
            $return_audio .= '<th width="40%">' . get_lang('Title') . '</th>';
            $return_audio .= '<th>' . get_lang('Audio') . '</th>';
            $return_audio .= '</tr>';

            if ($update_audio != 'true') {
                $return .= '<div class="col-md-12">';
                $return .= self::return_new_tree($update_audio);
                $return .='</div>';
                $return .= Display::div(Display::url(get_lang('Save'), '#', array('id'=>'listSubmit', 'class'=>'btn btn-primary')), array('style'=>'float:left; margin-top:15px;width:100%'));
            } else {
                $return_audio .= self::return_new_tree($update_audio);
                $return .= $return_audio.'</table>';
            }

            // We need to close the form when we are updating the mp3 files.
            if ($update_audio == 'true') {
                $return .= '<div class="footer-audio">';
                $return .= Display::button('save_audio','<i class="fa fa-file-audio-o"></i> '. get_lang('SaveAudioAndOrganization'),array('class'=>'btn btn-primary','type'=>'submit'));
                $return .= '</div>';
                //$return .= '<div><button class="btn btn-primary" type="submit" name="save_audio" id="save_audio">' . get_lang('SaveAudioAndOrganization') . '</button></div>'; // TODO: What kind of language variable is this?
            }
        }

        // We need to close the form when we are updating the mp3 files.
        if ($update_audio == 'true' && count($this->arrMenu) != 0) {
            $return .= '</form>';
        }
        return $return;
    }

    /**
     * @param string string $update_audio
     * @param bool $drop_element_here
     * @return string
     */
    public function return_new_tree($update_audio = 'false', $drop_element_here = false)
    {
        $return = '';
        $is_allowed_to_edit = api_is_allowed_to_edit(null,true);

        $course_id = api_get_course_int_id();
        $tbl_lp_item = Database :: get_course_table(TABLE_LP_ITEM);

        $sql = "SELECT * FROM $tbl_lp_item
                WHERE c_id = $course_id AND lp_id = ".$this->lp_id;

        $result = Database::query($sql);
        $arrLP = array();
        while ($row = Database :: fetch_array($result)) {

            $arrLP[] = array(
                'id' => $row['id'],
                'item_type' => $row['item_type'],
                'title' => Security :: remove_XSS($row['title']),
                'path' => $row['path'],
                'description' => Security::remove_XSS($row['description']),
                'parent_item_id' => $row['parent_item_id'],
                'previous_item_id' => $row['previous_item_id'],
                'next_item_id' => $row['next_item_id'],
                'max_score' => $row['max_score'],
                'min_score' => $row['min_score'],
                'mastery_score' => $row['mastery_score'],
                'prerequisite' => $row['prerequisite'],
                'display_order' => $row['display_order'],
                'audio' => $row['audio'],
                'prerequisite_max_score' => $row['prerequisite_max_score'],
                'prerequisite_min_score' => $row['prerequisite_min_score']
            );
        }

        $this->tree_array($arrLP);
        $arrLP = $this->arrMenu;
        unset ($this->arrMenu);
        $default_data = null;
        $default_content = null;

        $elements = array();
        $return_audio = null;

        for ($i = 0; $i < count($arrLP); $i++) {
            $title = $arrLP[$i]['title'];

            $title_cut = cut($arrLP[$i]['title'], 25);

            //Link for the documents
            if ($arrLP[$i]['item_type'] == 'document') {
                $url = api_get_self() . '?'.api_get_cidreq().'&action=view_item&mode=preview_document&id=' . $arrLP[$i]['id'] . '&lp_id=' . $this->lp_id;
                $title_cut = Display::url(
                    $title_cut,
                    $url,
                    array(
                        'class' => 'ajax',
                        'data-title' => $title_cut
                    )
                );
            }

            if (($i % 2) == 0) {
                $oddClass = 'row_odd';
            } else {
                $oddClass = 'row_even';
            }
            $return_audio .= '<tr id ="lp_item_'.$arrLP[$i]['id'] .'" class="' . $oddClass . '">';

            $icon_name = str_replace(' ', '', $arrLP[$i]['item_type']);

            $icon = '';
            if (file_exists('../img/lp_' . $icon_name . '.png')) {
                $icon = '<img src="../img/lp_' . $icon_name . '.png" />';
            } else {
                if (file_exists('../img/lp_' . $icon_name . '.gif')) {
                    $icon = '<img src="../img/lp_' . $icon_name . '.gif"  />';
                } else {
                    $icon = '<img src="../img/folder_document.gif" />';
                }
            }

            // The audio column.
            $return_audio  .= '<td align="left" style="padding-left:10px;">';

            $audio = '';

            if (!$update_audio || $update_audio <> 'true') {
                if (!empty($arrLP[$i]['audio'])) {
                    /*$audio .= '<span id="container'.$i.'"><a href="http://www.macromedia.com/go/getflashplayer">Get the Flash Player</a> to see this player.</span>';
                    $audio .= '<script type="text/javascript" src="../inc/lib/mediaplayer/swfobject.js"></script>';
                    $audio .= '<script type="text/javascript">
                                    var s1 = new SWFObject("../inc/lib/mediaplayer/player.swf","ply","250","20","9","#FFFFFF");
                                    s1.addParam("allowscriptaccess","always");
                                    s1.addParam("flashvars","file=../../courses/' . $_course['path'] . '/document/audio/' . $arrLP[$i]['audio'] . '");
                                    s1.write("container' . $i . '");
                                </script>';*/
                } else {
                    $audio .= '';
                }
            } else {
                $types = self::getChapterTypes();
                if (!in_array($arrLP[$i]['item_type'], $types)) {
                    $audio .= '<input type="file" name="mp3file' . $arrLP[$i]['id'] . '" id="mp3file" />';
                    if (!empty ($arrLP[$i]['audio'])) {
                        $audio .= '<br />'.Security::remove_XSS($arrLP[$i]['audio']).'<br />
                        <input type="checkbox" name="removemp3' . $arrLP[$i]['id'] . '" id="checkbox' . $arrLP[$i]['id'] . '" />' . get_lang('RemoveAudio');
                    }
                }
            }
            $return_audio .= Display::span($icon.' '.$title).Display::tag('td', $audio, array('style'=>''));
            $return_audio .= '</td>';
            $move_icon = '';
            $move_item_icon = '';
            $edit_icon = '';
            $delete_icon = '';
            $audio_icon = '';
            $prerequisities_icon = '';

            if ($is_allowed_to_edit) {
                if (!$update_audio || $update_audio <> 'true') {
                    $move_icon .= '<a class="moved" href="#">';
                    $move_icon .= Display::return_icon('move_everywhere.png', get_lang('Move'), array(), ICON_SIZE_TINY);
                    $move_icon .= '</a>';
                }

                // No edit for this item types
                if (!in_array($arrLP[$i]['item_type'], array('sco', 'asset'))) {
                    if (!in_array($arrLP[$i]['item_type'], array('dokeos_chapter', 'dokeos_module'))) {
                        $edit_icon .= '<a href="'.api_get_self().'?'.api_get_cidreq().'&action=edit_item&view=build&id=' . $arrLP[$i]['id'] . '&lp_id=' . $this->lp_id . '&path_item=' . $arrLP[$i]['path'] . '">';
                        $edit_icon .= Display::return_icon('edit.png', get_lang('LearnpathEditModule'), array(), ICON_SIZE_TINY);
                        $edit_icon .= '</a>';
                    } else {
                        $edit_icon .= '<a href="'.api_get_self().'?'.api_get_cidreq().'&action=edit_item&id=' . $arrLP[$i]['id'] . '&lp_id=' . $this->lp_id . '&path_item=' . $arrLP[$i]['path'] . '">';
                        $edit_icon .= Display::return_icon('edit.png', get_lang('LearnpathEditModule'), array(), ICON_SIZE_TINY);
                        $edit_icon .= '</a>';
                    }
                }

                $delete_icon .= ' <a href="'.api_get_self().'?'.api_get_cidreq().'&action=delete_item&id=' . $arrLP[$i]['id'] . '&lp_id=' . $this->lp_id . '" onClick="return confirmation(\'' . addslashes($title) . '\');">';
                $delete_icon .= Display::return_icon('delete.png', get_lang('LearnpathDeleteModule'), array(), ICON_SIZE_TINY);
                $delete_icon .= '</a>';

                $url = api_get_self() . '?'.api_get_cidreq().'&view=build&id='.$arrLP[$i]['id'] .'&lp_id='.$this->lp_id;

                if (!in_array($arrLP[$i]['item_type'], array('dokeos_chapter', 'dokeos_module', 'dir'))) {
                    $prerequisities_icon = Display::url(Display::return_icon('accept.png', get_lang('LearnpathPrerequisites'), array(), ICON_SIZE_TINY), $url.'&action=edit_item_prereq');
                    $move_item_icon = Display::url(Display::return_icon('move.png', get_lang('Move'), array(), ICON_SIZE_TINY), $url.'&action=move_item');
                    $audio_icon = Display::url(Display::return_icon('audio.png', get_lang('UplUpload'), array(), ICON_SIZE_TINY), $url.'&action=add_audio');
                }
            }
            if ($update_audio != 'true') {
                $row = $move_icon.' '.$icon.Display::span($title_cut).Display::span($audio.$edit_icon.$prerequisities_icon.$move_item_icon.$audio_icon.$delete_icon, array('class'=>'button_actions'));
            } else {
                $row = Display::span($title.$icon).Display::span($audio, array('class'=>'button_actions'));
            }
            $parent_id = $arrLP[$i]['parent_item_id'];

            $default_data[$arrLP[$i]['id']] = $row;
            $default_content[$arrLP[$i]['id']] = $arrLP[$i];

            if (empty($parent_id)) {
                $elements[$arrLP[$i]['id']]['data'] = $row;
                $elements[$arrLP[$i]['id']]['type'] = $arrLP[$i]['item_type'];
            } else {
                $parent_arrays = array();
                if ($arrLP[$i]['depth'] > 1) {
                    //Getting list of parents
                    for($j = 0; $j < $arrLP[$i]['depth']; $j++) {
                        foreach($arrLP as $item) {
                            if ($item['id'] == $parent_id) {
                                if ($item['parent_item_id'] == 0) {
                                    $parent_id = $item['id'];
                                    break;
                                } else {
                                    $parent_id = $item['parent_item_id'];
                                    if (empty($parent_arrays)) {
                                        $parent_arrays[] = intval($item['id']);
                                    }
                                    $parent_arrays[] = $parent_id;
                                    break;
                                }
                            }
                        }
                    }
                }

                if (!empty($parent_arrays)) {
                    $parent_arrays = array_reverse($parent_arrays);
                    $val = '$elements';
                    $x = 0;
                    foreach($parent_arrays as $item) {
                        if ($x != count($parent_arrays) -1) {
                            $val .= '["'.$item.'"]["children"]';
                        } else {
                            $val .= '["'.$item.'"]["children"]';
                        }
                        $x++;
                    }
                    $val .= "";
                    $code_str = $val."[".$arrLP[$i]['id']."][\"load_data\"] = '".$arrLP[$i]['id']."' ; ";
                    eval($code_str);
                } else {
                    $elements[$parent_id]['children'][$arrLP[$i]['id']]['data'] = $row;
                    $elements[$parent_id]['children'][$arrLP[$i]['id']]['type'] = $arrLP[$i]['item_type'];
                }
            }
        }

        $list = '<ul id="lp_item_list">';
        $tree = self::print_recursive($elements, $default_data, $default_content);

        if (!empty($tree)) {
            $list .= $tree;
        } else {
            if ($drop_element_here) {
                $list .= Display::return_message(get_lang("DragAndDropAnElementHere"));
            }
        }
        $list .= '</ul>';

        $return .= Display::panel($list, $this->name);

        if ($update_audio == 'true') {
            $return = $return_audio;
        }

        return $return;
    }

    /**
     * @param array $elements
     * @param array $default_data
     * @param array $default_content
     * @return string
     */
    public function print_recursive($elements, $default_data, $default_content)
    {
        $return = '';
        foreach ($elements as $key => $item) {
            if (isset($item['load_data']) || empty($item['data'])) {
                $item['data'] = $default_data[$item['load_data']];
                $item['type'] = $default_content[$item['load_data']]['item_type'];
            }
            $sub_list = '';
            if (isset($item['type']) && $item['type'] == 'dokeos_chapter') {
                $sub_list = Display::tag('li', '', array('class'=>'sub_item empty')); // empty value
            }
            if (empty($item['children'])) {
                $sub_list = Display::tag('ul', $sub_list, array('id'=>'UL_'.$key, 'class'=>'record li_container'));
                $active = null;
                if (isset($_REQUEST['id']) && $key == $_REQUEST['id']) {
                    $active = 'active';
                }
                $return  .= Display::tag('li', Display::div($item['data'], array('class'=>"item_data $active")).$sub_list, array('id'=>$key, 'class'=>'record li_container'));
            } else {
                //sections
                if (isset($item['children'])) {
                    $data = self::print_recursive($item['children'], $default_data, $default_content);
                }
                $sub_list = Display::tag('ul', $sub_list.$data, array('id'=>'UL_'.$key, 'class'=>'record li_container'));
                $return .= Display::tag('li', Display::div($item['data'], array('class'=>'item_data')).$sub_list, array('id'=>$key, 'class'=>'record li_container'));
            }
        }

        return $return;
    }

    /**
     * This function builds the action menu
     * @param bool $returnContent
     * @return void
     */
    public function build_action_menu($returnContent = false)
    {
        $gradebook = isset($_GET['gradebook']) ? Security :: remove_XSS($_GET['gradebook']) : null;
        $return = '<div class="actions">';
        $return .=  '<a href="lp_controller.php?'.api_get_cidreq().'&gradebook=' . $gradebook . '&action=view&lp_id=' . $_SESSION['oLP']->lp_id . '&isStudentView=true">' . Display :: return_icon('preview_view.png', get_lang('Display'),'',ICON_SIZE_MEDIUM).'</a> ';
        $return .= '<a href="'.api_get_self().'?'.api_get_cidreq().'&action=admin_view&lp_id=' . $_SESSION['oLP']->lp_id . '&updateaudio=true">' . Display :: return_icon('upload_audio.png', get_lang('UpdateAllAudioFragments'),'',ICON_SIZE_MEDIUM).'</a>';
        $return .= '<a href="lp_controller.php?'.api_get_cidreq().'&action=edit&lp_id=' . $_SESSION['oLP']->lp_id . '">' . Display :: return_icon('settings.png', get_lang('CourseSettings'),'',ICON_SIZE_MEDIUM).'</a>';
        $buttons = array(
            array(
                'title' => get_lang('SetPrerequisiteForEachItem'),
                'href' => 'lp_controller.php?'.api_get_cidreq().'&action=set_previous_step_as_prerequisite&lp_id=' . $_SESSION['oLP']->lp_id,
            ),
            array(
                'title' => get_lang('ClearAllPrerequisites'),
                'href' => 'lp_controller.php?'.api_get_cidreq().'&action=clear_prerequisites&lp_id=' . $_SESSION['oLP']->lp_id,
            ),
        );
        $return .= Display::group_button(get_lang('PrerequisitesOptions'), $buttons);
        $return .= '</div>';

        if ($returnContent) {
            return $return;
        }
        echo $return;
    }

    /**
     * Creates the default learning path folder
     * @param array $course
     * @return bool
     */
    public static function generate_learning_path_folder($course)
    {
        // Creating learning_path folder
        $dir = '/learning_path';
        $filepath = api_get_path(SYS_COURSE_PATH).$course['path'] . '/document';
        $folder = false;
        if (!is_dir($filepath.'/'.$dir)) {
            $folderData = create_unexisting_directory(
                $course,
                api_get_user_id(),
                api_get_session_id(),
                0,
                0,
                $filepath,
                $dir,
                get_lang('LearningPaths'),
                0
            );
            if (!empty($folderData)) {
                $folder = true;
            }
        } else {
            $folder = true;
        }
        return $folder;
    }

    /**
     * @param array $course
     * @param string $lp_name
     * @return array
     */
    public function generate_lp_folder($course, $lp_name = null)
    {
        $filepath = '';
        $dir = '/learning_path/';

        if (empty($lp_name)) {
            $lp_name = $this->name;
        }

        $folder = self::generate_learning_path_folder($course);
        // Creating LP folder
        if ($folder) {
            //Limits title size
            $title = api_substr(api_replace_dangerous_char($lp_name), 0 , 80);
            $dir   = $dir.$title;
            $filepath = api_get_path(SYS_COURSE_PATH) . $course['path'] . '/document';
            if (!is_dir($filepath.'/'.$dir)) {
                $folderData = create_unexisting_directory(
                    $course,
                    api_get_user_id(),
                    0,
                    0,
                    0,
                    $filepath,
                    $dir,
                    $lp_name
                );
                if (!empty($folderData)) {
                    $folder = true;
                }
            } else {
                $folder = true;
            }
            $dir = $dir.'/';
            if ($folder) {
                $filepath = api_get_path(SYS_COURSE_PATH) . $course['path'] . '/document'.$dir;
            }
        }
        $array = array(
            'dir' => $dir,
            'filepath' => $filepath,
            'folder' => $folder
        );
        return $array;
    }

    /**
     * Create a new document //still needs some finetuning
     * @param array $_course
     * @return string
     */
    public function create_document($_course)
    {
        $course_id = api_get_course_int_id();
        global $charset;
        $dir = isset ($_GET['dir']) ? $_GET['dir'] : $_POST['dir']; // Please, do not modify this dirname formatting.
        if (strstr($dir, '..'))
            $dir = '/';
        if ($dir[0] == '.')
            $dir = substr($dir, 1);
        if ($dir[0] != '/')
            $dir = '/' . $dir;
        if ($dir[strlen($dir) - 1] != '/')
            $dir .= '/';

        $filepath = api_get_path(SYS_COURSE_PATH) . $_course['path'] . '/document' . $dir;

        if (empty($_POST['dir']) && empty($_GET['dir'])) {
            //Generates folder
            $result     = $this->generate_lp_folder($_course);
            $dir 		= $result['dir'];
            $filepath 	= $result['filepath'];
        }

        if (!is_dir($filepath)) {
            $filepath = api_get_path(SYS_COURSE_PATH) . $_course['path'] . '/document/';
            $dir = '/';
        }

        // stripslashes() before calling api_replace_dangerous_char() because $_POST['title']
        // is already escaped twice when it gets here.
        $title = api_replace_dangerous_char(stripslashes($_POST['title']));
        $title = disable_dangerous_file($title);

        $filename = $title;
        $content = $_POST['content_lp'];

        $tmp_filename = $filename;

        $i = 0;
        while (file_exists($filepath . $tmp_filename . '.html'))
            $tmp_filename = $filename . '_' . ++ $i;

        $filename = $tmp_filename . '.html';
        $content = stripslashes($content);

        $content = str_replace(api_get_path(WEB_COURSE_PATH), api_get_path(REL_PATH).'courses/', $content);

        // Change the path of mp3 to absolute.

        // The first regexp deals with :// urls.
        $content = preg_replace("|(flashvars=\"file=)([^:/]+)/|", "$1" . api_get_path(REL_COURSE_PATH) . $_course['path'] . '/document/', $content);
        // The second regexp deals with audio/ urls.
        $content = preg_replace("|(flashvars=\"file=)([^/]+)/|", "$1" . api_get_path(REL_COURSE_PATH) . $_course['path'] . '/document/$2/', $content);
        // For flv player: To prevent edition problem with firefox, we have to use a strange tip (don't blame me please).
        $content = str_replace('</body>', '<style type="text/css">body{}</style></body>', $content);

        if (!file_exists($filepath . $filename)) {
            if ($fp = @ fopen($filepath . $filename, 'w')) {
                fputs($fp, $content);
                fclose($fp);

                $file_size = filesize($filepath . $filename);
                $save_file_path = $dir.$filename;

                $document_id = add_document(
                    $_course,
                    $save_file_path,
                    'file',
                    $file_size,
                    $tmp_filename
                );

                if ($document_id) {
                    api_item_property_update(
                        $_course,
                        TOOL_DOCUMENT,
                        $document_id,
                        'DocumentAdded',
                        api_get_user_id(),
                        null,
                        null,
                        null,
                        null,
                        api_get_session_id()
                    );

                    $new_comment = (isset($_POST['comment'])) ? trim($_POST['comment']) : '';
                    $new_title = (isset($_POST['title'])) ? trim($_POST['title']) : '';

                    if ($new_comment || $new_title) {
                        $tbl_doc = Database :: get_course_table(TABLE_DOCUMENT);
                        $ct = '';
                        if ($new_comment)
                            $ct .= ", comment='" . Database::escape_string($new_comment). "'";
                        if ($new_title)
                            $ct .= ", title='" . Database::escape_string(htmlspecialchars($new_title, ENT_QUOTES, $charset))."' ";

                        $sql_update = "UPDATE " . $tbl_doc ." SET " . substr($ct, 1)." WHERE c_id = ".$course_id." AND id = " . $document_id;
                        Database::query($sql_update);
                    }
                }
                return $document_id;
            }
        }
    }

    /**
     * Edit a document based on $_POST and $_GET parameters 'dir' and 'path'
     * @param 	array $_course array
     * @return 	void
     */
    public function edit_document($_course)
    {
        $course_id = api_get_course_int_id();
        global $_configuration;
        // Please, do not modify this dirname formatting.
        $dir = isset($_GET['dir']) ? $_GET['dir'] : $_POST['dir'];

        if (strstr($dir, '..'))
            $dir = '/';

        if ($dir[0] == '.')
            $dir = substr($dir, 1);

        if ($dir[0] != '/')
            $dir = '/' . $dir;

        if ($dir[strlen($dir) - 1] != '/')
            $dir .= '/';

        $filepath = api_get_path(SYS_COURSE_PATH) . $_course['path'] . '/document' . $dir;

        if (!is_dir($filepath)) {
            $filepath = api_get_path(SYS_COURSE_PATH) . $_course['path'] . '/document/';
            $dir = '/';
        }

        $table_doc = Database :: get_course_table(TABLE_DOCUMENT);
        if (isset($_POST['path']) && !empty($_POST['path'])) {
            $document_id = intval($_POST['path']);
            $sql = "SELECT path FROM " . $table_doc . "
                    WHERE c_id = $course_id AND id = " . $document_id;
            $res = Database::query($sql);
            $row = Database :: fetch_array($res);
            $content = stripslashes($_POST['content_lp']);
            $file = $filepath . $row['path'];

            if ($fp = @ fopen($file, 'w')) {
                $content = text_filter($content);
                $content = str_replace(api_get_path(WEB_COURSE_PATH), $_configuration['url_append'] . '/courses/', $content);

                // Change the path of mp3 to absolute.
                // The first regexp deals with :// urls.
                $content = preg_replace("|(flashvars=\"file=)([^:/]+)/|", "$1" . api_get_path(REL_COURSE_PATH) . $_course['path'] . '/document/', $content);
                // The second regexp deals with audio/ urls.
                $content = preg_replace("|(flashvars=\"file=)([^:/]+)/|", "$1" . api_get_path(REL_COURSE_PATH) . $_course['path'] . '/document/$2/', $content);
                fputs($fp, $content);
                fclose($fp);

                $sql = "UPDATE " . $table_doc ." SET
                            title='".Database::escape_string($_POST['title'])."'
                        WHERE c_id = ".$course_id." AND id = " . $document_id;
                Database::query($sql);
            }
        }
    }

    /**
     * Displays the selected item, with a panel for manipulating the item
     * @param int $item_id
     * @param string $msg
     * @return string
     */
    public function display_item($item_id, $msg = null, $show_actions = true)
    {
        $course_id = api_get_course_int_id();
        $return = '';
        if (is_numeric($item_id)) {
            $tbl_lp_item = Database :: get_course_table(TABLE_LP_ITEM);
            $sql = "SELECT lp.* FROM " . $tbl_lp_item . " as lp
                    WHERE c_id = ".$course_id." AND lp.id = " . intval($item_id);
            $result = Database::query($sql);
            while ($row = Database :: fetch_array($result,'ASSOC')) {
                $_SESSION['parent_item_id'] = ($row['item_type'] == 'dokeos_chapter' || $row['item_type'] == 'dokeos_module' || $row['item_type'] == 'dir') ? $item_id : 0;

                // Prevents wrong parent selection for document, see Bug#1251.
                if ($row['item_type'] != 'dokeos_chapter' || $row['item_type'] != 'dokeos_module') {
                    $_SESSION['parent_item_id'] = $row['parent_item_id'];
                }

                if ($show_actions) {
                    $return .= $this->display_manipulate($item_id, $row['item_type']);
                }
                $return .= '<div style="padding:10px;">';

                if ($msg != '')
                    $return .= $msg;

                $return .= '<h3>'.$row['title'].'</h3>';
                switch ($row['item_type']) {
                    case TOOL_QUIZ:
                        if (!empty($row['path'])) {
                            $exercise = new Exercise();
                            $exercise->read($row['path']);
                            $return .= $exercise->description.'<br />';
                        }
                        break;
                    case TOOL_DOCUMENT:
                        $tbl_doc = Database :: get_course_table(TABLE_DOCUMENT);
                        $sql_doc = "SELECT path FROM " . $tbl_doc . "
                                    WHERE c_id = ".$course_id." AND id = " . intval($row['path']);
                        $result = Database::query($sql_doc);
                        $path_file = Database::result($result, 0, 0);
                        $path_parts = pathinfo($path_file);
                        // TODO: Correct the following naive comparisons, also, htm extension is missing.
                        if (in_array($path_parts['extension'], array(
                            'html',
                            'txt',
                            'png',
                            'jpg',
                            'JPG',
                            'jpeg',
                            'JPEG',
                            'gif',
                            'swf'
                        ))) {
                            $return .= $this->display_document($row['path'], true, true);
                        }
                        break;
                }
                $return .= '</div>';
            }
        }

        return $return;
    }

    /**
     * Shows the needed forms for editing a specific item
     * @param int $item_id
     * @return string
     */
    public function display_edit_item($item_id)
    {
        $course_id = api_get_course_int_id();
        $return = '';
        if (is_numeric($item_id)) {
            $tbl_lp_item = Database :: get_course_table(TABLE_LP_ITEM);
            $sql = "SELECT * FROM $tbl_lp_item
                    WHERE c_id = ".$course_id." AND id = " . intval($item_id);
            $res = Database::query($sql);
            $row = Database::fetch_array($res);

            switch ($row['item_type']) {
                case 'dokeos_chapter' :
                case 'dir' :
                case 'asset' :
                case 'sco' :
                    if (isset ($_GET['view']) && $_GET['view'] == 'build') {
                        $return .= $this->display_manipulate($item_id, $row['item_type']);
                        $return .= $this->display_item_form($row['item_type'], get_lang('EditCurrentChapter') . ' :', 'edit', $item_id, $row);
                    } else {
                        $return .= $this->display_item_small_form($row['item_type'], get_lang('EditCurrentChapter') . ' :', $row);
                    }
                    break;
                case TOOL_DOCUMENT :
                    $tbl_doc = Database :: get_course_table(TABLE_DOCUMENT);
                    $sql = "SELECT lp.*, doc.path as dir
                            FROM " . $tbl_lp_item . " as lp
                            LEFT JOIN " . $tbl_doc . " as doc
                            ON doc.id = lp.path
                            WHERE
                                lp.c_id = $course_id AND
                                doc.c_id = $course_id AND
                                lp.id = " . intval($item_id);
                    $res_step = Database::query($sql);
                    $row_step = Database :: fetch_array($res_step);
                    $return .= $this->display_manipulate($item_id, $row['item_type']);
                    $return .= $this->display_document_form('edit', $item_id, $row_step);
                    break;
                case TOOL_LINK :
                    $link_id = (string) $row['path'];
                    if (ctype_digit($link_id)) {
                        $tbl_link = Database :: get_course_table(TABLE_LINK);
                        $sql_select = 'SELECT url FROM ' . $tbl_link . '
                                       WHERE c_id = '.$course_id.' AND id = ' . intval($link_id);
                        $res_link = Database::query($sql_select);
                        $row_link = Database :: fetch_array($res_link);
                        if (is_array($row_link)) {
                            $row['url'] = $row_link['url'];
                        }
                    }
                    $return .= $this->display_manipulate($item_id, $row['item_type']);
                    $return .= $this->display_link_form('edit', $item_id, $row);
                    break;
                case 'dokeos_module' :
                    if (isset ($_GET['view']) && $_GET['view'] == 'build') {
                        $return .= $this->display_manipulate($item_id, $row['item_type']);
                        $return .= $this->display_item_form($row['item_type'], get_lang('EditCurrentModule') . ' :', 'edit', $item_id, $row);
                    } else {
                        $return .= $this->display_item_small_form($row['item_type'], get_lang('EditCurrentModule') . ' :', $row);
                    }
                    break;
                case TOOL_QUIZ :
                    $return .= $this->display_manipulate($item_id, $row['item_type']);
                    $return .= $this->display_quiz_form('edit', $item_id, $row);
                    break;
                case TOOL_HOTPOTATOES :
                    $return .= $this->display_manipulate($item_id, $row['item_type']);
                    $return .= $this->display_hotpotatoes_form('edit', $item_id, $row);
                    break;
                case TOOL_STUDENTPUBLICATION :
                    $return .= $this->display_manipulate($item_id, $row['item_type']);
                    $return .= $this->display_student_publication_form('edit', $item_id, $row);
                    break;
                case TOOL_FORUM :
                    $return .= $this->display_manipulate($item_id, $row['item_type']);
                    $return .= $this->display_forum_form('edit', $item_id, $row);
                    break;
                case TOOL_THREAD :
                    $return .= $this->display_manipulate($item_id, $row['item_type']);
                    $return .= $this->display_thread_form('edit', $item_id, $row);
                    break;
            }
        }

        return $return;
    }

    /**
     * Function that displays a list with al the resources that
     * could be added to the learning path
     * @return string
     */
    public function display_resources()
    {
        $course_code = api_get_course_id();

        // Get all the docs.
        $documents = $this->get_documents(true);
        // Get all the exercises.
        $exercises = $this->get_exercises();

        // Get all the links.
        $links = $this->get_links();

        // Get al the student publications.
        $works = $this->get_student_publications();

        // Get al the forums.
        $forums = $this->get_forums(null, $course_code);

        $headers = array(
            Display::return_icon('folder_document.png', get_lang('Documents'), array(), ICON_SIZE_BIG),
            Display::return_icon('quiz.png',  get_lang('Quiz'), array(), ICON_SIZE_BIG),
            Display::return_icon('links.png', get_lang('Links'), array(), ICON_SIZE_BIG),
            Display::return_icon('works.png', get_lang('Works'), array(), ICON_SIZE_BIG),
            Display::return_icon('forum.png', get_lang('Forums'), array(), ICON_SIZE_BIG),
            Display::return_icon('add_learnpath_section.png', get_lang('NewChapter'), array(), ICON_SIZE_BIG)
        );

        echo Display::display_normal_message(get_lang('ClickOnTheLearnerViewToSeeYourLearningPath'));
        $chapter = $_SESSION['oLP']->display_item_form('chapter', get_lang('EnterDataNewChapter'), 'add_item');
        echo Display::tabs(
            $headers,
            array($documents, $exercises, $links, $works, $forums, $chapter), 'resource_tab'
        );

        return true;
    }

    /**
     * Returns the extension of a document
     * @param string filename
     * @return string Extension (part after the last dot)
     */
    public function get_extension($filename)
    {
        $explode = explode('.', $filename);
        return $explode[count($explode) - 1];
    }

    /**
     * Displays a document by id
     *
     * @param int $id
     * @return string
     */
    public function display_document($id, $show_title = false, $iframe = true, $edit_link = false)
    {
        $_course = api_get_course_info();
        $course_id = api_get_course_int_id();
        $return = '';
        $tbl_doc = Database :: get_course_table(TABLE_DOCUMENT);
        $sql_doc = "SELECT * FROM " . $tbl_doc . "
                    WHERE c_id = ".$course_id." AND id = " . $id;
        $res_doc = Database::query($sql_doc);
        $row_doc = Database :: fetch_array($res_doc);

        // TODO: Add a path filter.
        if ($iframe) {
            $return .= '<iframe id="learnpath_preview_frame" frameborder="0" height="400" width="100%" scrolling="auto" src="' . api_get_path(WEB_COURSE_PATH) . $_course['path'] . '/document' . str_replace('%2F', '/', urlencode($row_doc['path'])) . '?' . api_get_cidreq() . '"></iframe>';
        } else {
            $return .= file_get_contents(api_get_path(SYS_COURSE_PATH) . $_course['path'] . '/document' . $row_doc['path']);
        }

        return $return;
    }

    /**
     * Return HTML form to add/edit a quiz
     * @param	string	Action (add/edit)
     * @param	integer	Item ID if already exists
     * @param	mixed	Extra information (quiz ID if integer)
     * @return	string	HTML form
     */
    public function display_quiz_form($action = 'add', $id = 0, $extra_info = '')
    {
        $course_id = api_get_course_int_id();
        $tbl_lp_item = Database :: get_course_table(TABLE_LP_ITEM);
        $tbl_quiz = Database :: get_course_table(TABLE_QUIZ_TEST);

        if ($id != 0 && is_array($extra_info)) {
            $item_title = $extra_info['title'];
            $item_description = $extra_info['description'];
        } elseif (is_numeric($extra_info)) {
            $sql = "SELECT title, description
                    FROM " . $tbl_quiz . "
                    WHERE c_id = ".$course_id." AND id = " . $extra_info;

            $result = Database::query($sql);
            $row = Database::fetch_array($result);
            $item_title = $row['title'];
            $item_description = $row['description'];
        } else {
            $item_title = '';
            $item_description = '';
        }
        $item_title			= Security::remove_XSS($item_title);
        $item_description 	= Security::remove_XSS($item_description);

        $legend = '<legend>';
        if ($id != 0 && is_array($extra_info))
            $parent = $extra_info['parent_item_id'];
        else
            $parent = 0;

        $sql = "SELECT * FROM " . $tbl_lp_item . "
                WHERE c_id = ".$course_id." AND lp_id = " . $this->lp_id;

        $result = Database::query($sql);
        $arrLP = array ();
        while ($row = Database :: fetch_array($result)) {
            $arrLP[] = array (
                'id' => $row['id'],
                'item_type' => $row['item_type'],
                'title' => $row['title'],
                'path' => $row['path'],
                'description' => $row['description'],
                'parent_item_id' => $row['parent_item_id'],
                'previous_item_id' => $row['previous_item_id'],
                'next_item_id' => $row['next_item_id'],
                'display_order' => $row['display_order'],
                'max_score' => $row['max_score'],
                'min_score' => $row['min_score'],
                'mastery_score' => $row['mastery_score'],
                'prerequisite' => $row['prerequisite'],
                'max_time_allowed' => $row['max_time_allowed']
            );
        }

        $this->tree_array($arrLP);
        $arrLP = $this->arrMenu;
        unset ($this->arrMenu);

        if ($action == 'add') {
            $legend .= get_lang('CreateTheExercise') . '&nbsp;:';
        } elseif ($action == 'move') {
            $legend .= get_lang('MoveTheCurrentExercise') . '&nbsp;:';
        } else {
            $legend .= get_lang('EditCurrentExecice') . '&nbsp;:';
        }

        if (isset ($_GET['edit']) && $_GET['edit'] == 'true') {
            $legend .= Display :: return_warning_message(get_lang('Warning') . ' ! ' . get_lang('WarningEditingDocument'));
        }

        $legend .= '</legend>';
        $return = '';
        $return .= '<div class="sectioncomment">';

        $return .= '<form method="POST">';
        $return .= $legend;
        $return .= '<table class="lp_form">';

        if ($action != 'move') {
            $return .= '<tr>';
            $return .= '<td class="label"><label for="idTitle">' . get_lang('Title') . '</label></td>';
            $return .= '<td class="input"><input id="idTitle" name="title" size="44" type="text" value="' . $item_title . '" /></td>';
            $return .= '</tr>';
        }

        $return .= '<tr>';

        $return .= '<td class="label"><label for="idParent">' . get_lang('Parent') . '</label></td>';
        $return .= '<td class="input">';

        // Select for Parent item, root or chapter
        $return .= '<select id="idParent" style="width:100%;" name="parent" onChange="javascript: load_cbo(this.value);" size="1">';

        $return .= '<option class="top" value="0">' . $this->name . '</option>';

        $arrHide = array (
            $id
        );
        for ($i = 0; $i < count($arrLP); $i++) {
            if ($action != 'add') {
                if (($arrLP[$i]['item_type'] == 'dokeos_module' || $arrLP[$i]['item_type'] == 'dokeos_chapter' || $arrLP[$i]['item_type'] == 'dir') && !in_array($arrLP[$i]['id'], $arrHide) && !in_array($arrLP[$i]['parent_item_id'], $arrHide)) {
                    $return .= '<option ' . (($parent == $arrLP[$i]['id']) ? 'selected="selected" ' : '') . 'style="padding-left:' . ($arrLP[$i]['depth'] * 10) . 'px;" value="' . $arrLP[$i]['id'] . '">' . $arrLP[$i]['title'] . '</option>';
                } else {
                    $arrHide[] = $arrLP[$i]['id'];
                }
            } else {
                if ($arrLP[$i]['item_type'] == 'dokeos_module' || $arrLP[$i]['item_type'] == 'dokeos_chapter' || $arrLP[$i]['item_type'] == 'dir')
                    $return .= '<option ' . (($parent == $arrLP[$i]['id']) ? 'selected="selected" ' : '') . 'style="padding-left:' . ($arrLP[$i]['depth'] * 10) . 'px;" value="' . $arrLP[$i]['id'] . '">' . $arrLP[$i]['title'] . '</option>';
            }
        }
        if (is_array($arrLP)) {
            reset($arrLP);
        }

        $return .= '</select>';
        $return .= '</td>';
        $return .= '</tr>';
        $return .= '<tr>';

        $return .= '<td class="label"><label for="previous">' . get_lang('Position') . '</label></td>';
        $return .= '<td class="input">';

        $return .= '<select class="learnpath_item_form" style="width:100%;" id="previous" name="previous" size="1">';
        $return .= '<option class="top" value="0">' . get_lang('FirstPosition') . '</option>';
        for ($i = 0; $i < count($arrLP); $i++) {
            if ($arrLP[$i]['parent_item_id'] == $parent && $arrLP[$i]['id'] != $id) {
                if ($extra_info['previous_item_id'] == $arrLP[$i]['id'])
                    $selected = 'selected="selected" ';
                elseif ($action == 'add') $selected = 'selected="selected" ';
                else
                    $selected = '';
                $return .= '<option ' . $selected . 'value="' . $arrLP[$i]['id'] . '">' . get_lang('After') . ' "' . $arrLP[$i]['title'] . '"</option>';
            }
        }
        $return .= '</select>';

        $return .= '</td>';
        $return .= '</tr>';
        if ($action != 'move') {
            $id_prerequisite = 0;
            if (is_array($arrLP)) {
                foreach ($arrLP as $key => $value) {
                    if ($value['id'] == $id) {
                        $id_prerequisite = $value['prerequisite'];
                        break;
                    }
                }
            }
            $arrHide = array ();
            for ($i = 0; $i < count($arrLP); $i++) {
                if ($arrLP[$i]['id'] != $id && $arrLP[$i]['item_type'] != 'dokeos_chapter') {
                    if ($extra_info['previous_item_id'] == $arrLP[$i]['id'])
                        $s_selected_position = $arrLP[$i]['id'];
                    elseif ($action == 'add') $s_selected_position = 0;
                    $arrHide[$arrLP[$i]['id']]['value'] = $arrLP[$i]['title'];
                }
            }
            /*// Commented the prerequisites, only visible in edit (exercise).
            $return .= '<tr>';
            $return .= '<td class="label"><label for="idPrerequisites">'.get_lang('LearnpathPrerequisites').'</label></td>';
            $return .= '<td class="input"><select name="prerequisites" id="prerequisites" class="learnpath_item_form"><option value="0">'.get_lang('NoPrerequisites').'</option>';

                foreach($arrHide as $key => $value){
                    if($key==$s_selected_position && $action == 'add'){
                        $return .= '<option value="'.$key.'" selected="selected">'.$value['value'].'</option>';
                    }
                    elseif($key==$id_prerequisite && $action == 'edit'){
                        $return .= '<option value="'.$key.'" selected="selected">'.$value['value'].'</option>';
                    }
                    else{
                        $return .= '<option value="'.$key.'">'.$value['value'].'</option>';
                    }
                }

            $return .= "</select></td>";
            */
            $return .= '</tr>';
            /*$return .= '<tr>';
            $return .= '<td class="label"><label for="maxTimeAllowed">' . get_lang('MaxTimeAllowed') . '</label></td>';
            $return .= '<td class="input"><input name="maxTimeAllowed" style="width:98%;" id="maxTimeAllowed" value="' . $extra_info['max_time_allowed'] . '" /></td>';

            // Remove temporarily the test description.
            //$return .= '<td class="label"><label for="idDescription">'.get_lang('Description').' :</label></td>';
            //$return .= '<td class="input"><textarea id="idDescription" name="description" rows="4">' . $item_description . '</textarea></td>';

            $return .= '</tr>'; */
        }

        $return .= '<tr>';
        if ($action == 'add') {
            $return .= '<td>&nbsp;</td><td><button class="save" name="submit_button" type="submit">' . get_lang('AddExercise') . '</button></td>';
        } else {
            $return .= '<td>&nbsp;</td><td><button class="save" name="submit_button" type="submit">' . get_lang('EditCurrentExecice') . '</button></td>';
        }

        $return .= '</tr>';
        $return .= '</table>';

        if ($action == 'move') {
            $return .= '<input name="title" type="hidden" value="' . $item_title . '" />';
            $return .= '<input name="description" type="hidden" value="' . $item_description . '" />';
        }

        if (is_numeric($extra_info)) {
            $return .= '<input name="path" type="hidden" value="' . $extra_info . '" />';
        } elseif (is_array($extra_info)) {
            $return .= '<input name="path" type="hidden" value="' . $extra_info['path'] . '" />';
        }

        $return .= '<input name="type" type="hidden" value="' . TOOL_QUIZ . '" />';
        $return .= '<input name="post_time" type="hidden" value="' . time() . '" />';

        $return .= '</form>';
        $return .= '</div>';

        return $return;
    }

    /**
     * Addition of Hotpotatoes tests
     * @param	string	Action
     * @param	integer	Internal ID of the item
     * @param	mixed	Extra information - can be an array with title and description indexes
     * @return  string	HTML structure to display the hotpotatoes addition formular
     */
    public function display_hotpotatoes_form($action = 'add', $id = 0, $extra_info = '')
    {
        $course_id = api_get_course_int_id();
        $uploadPath = DIR_HOTPOTATOES; //defined in main_api
        $tbl_lp_item = Database :: get_course_table(TABLE_LP_ITEM);

        if ($id != 0 && is_array($extra_info)) {
            $item_title = stripslashes($extra_info['title']);
            $item_description = stripslashes($extra_info['description']);
        } elseif (is_numeric($extra_info)) {
            $TBL_DOCUMENT = Database :: get_course_table(TABLE_DOCUMENT);

            $sql = "SELECT * FROM " . $TBL_DOCUMENT . "
                    WHERE
                        c_id = ".$course_id." AND
                        path LIKE '" . $uploadPath . "/%/%htm%' AND
                        id = " . (int) $extra_info . "
                    ORDER BY id ASC";

            $res_hot = Database::query($sql);
            $row = Database::fetch_array($res_hot);

            $item_title = $row['title'];
            $item_description = $row['description'];

            if (!empty ($row['comment'])) {
                $item_title = $row['comment'];
            }
        } else {
            $item_title = '';
            $item_description = '';
        }

        if ($id != 0 && is_array($extra_info)) {
            $parent = $extra_info['parent_item_id'];
        } else {
            $parent = 0;
        }

        $sql = "SELECT * FROM $tbl_lp_item
                WHERE c_id = ".$course_id." AND lp_id = " . $this->lp_id;
        $result = Database::query($sql);
        $arrLP = array ();
        while ($row = Database :: fetch_array($result)) {
            $arrLP[] = array (
                'id' => $row['id'],
                'item_type' => $row['item_type'],
                'title' => $row['title'],
                'path' => $row['path'],
                'description' => $row['description'],
                'parent_item_id' => $row['parent_item_id'],
                'previous_item_id' => $row['previous_item_id'],
                'next_item_id' => $row['next_item_id'],
                'display_order' => $row['display_order'],
                'max_score' => $row['max_score'],
                'min_score' => $row['min_score'],
                'mastery_score' => $row['mastery_score'],
                'prerequisite' => $row['prerequisite'],
                'max_time_allowed' => $row['max_time_allowed']
            );
        }

        $legend = '<legend>';
        if ($action == 'add')
            $legend .= get_lang('CreateTheExercise');
        elseif ($action == 'move') $legend .= get_lang('MoveTheCurrentExercise');
        else
            $legend .= get_lang('EditCurrentExecice');
        if (isset ($_GET['edit']) && $_GET['edit'] == 'true') {
            $legend .= Display :: return_warning_message(get_lang('Warning') . ' ! ' . get_lang('WarningEditingDocument'));
        }
        $legend .= '</legend>';

        $return = '<form method="POST">';
        $return .= $legend;
        $return .= '<table cellpadding="0" cellspacing="0" class="lp_form">';
        $return .= '<tr>';
        $return .= '<td class="label"><label for="idParent">' . get_lang('Parent') . ' :</label></td>';
        $return .= '<td class="input">';
        $return .= '<select id="idParent" name="parent" onChange="javascript: load_cbo(this.value);" size="1">';
        $return .= '<option class="top" value="0">' . $this->name . '</option>';
        $arrHide = array (
            $id
        );

        if (count($arrLP) > 0) {
            for ($i = 0; $i < count($arrLP); $i++) {
                if ($action != 'add') {
                    if (($arrLP[$i]['item_type'] == 'dokeos_module' || $arrLP[$i]['item_type'] == 'dokeos_chapter' || $arrLP[$i]['item_type'] == 'dir') && !in_array($arrLP[$i]['id'], $arrHide) && !in_array($arrLP[$i]['parent_item_id'], $arrHide)) {
                        $return .= '<option ' . (($parent == $arrLP[$i]['id']) ? 'selected="selected" ' : '') . 'style="padding-left:' . ($arrLP[$i]['depth'] * 10) . 'px;" value="' . $arrLP[$i]['id'] . '">' . $arrLP[$i]['title'] . '</option>';
                    } else {
                        $arrHide[] = $arrLP[$i]['id'];
                    }
                } else {
                    if ($arrLP[$i]['item_type'] == 'dokeos_module' || $arrLP[$i]['item_type'] == 'dokeos_chapter' || $arrLP[$i]['item_type'] == 'dir')
                        $return .= '<option ' . (($parent == $arrLP[$i]['id']) ? 'selected="selected" ' : '') . 'style="padding-left:' . ($arrLP[$i]['depth'] * 10) . 'px;" value="' . $arrLP[$i]['id'] . '">' . $arrLP[$i]['title'] . '</option>';
                }
            }

            reset($arrLP);
        }

        $return .= '</select>';
        $return .= '</td>';
        $return .= '</tr>';
        $return .= '<tr>';
        $return .= '<td class="label"><label for="previous">' . get_lang('Position') . ' :</label></td>';
        $return .= '<td class="input">';
        $return .= '<select id="previous" name="previous" size="1">';
        $return .= '<option class="top" value="0">' . get_lang('FirstPosition') . '</option>';

        for ($i = 0; $i < count($arrLP); $i++) {
            if ($arrLP[$i]['parent_item_id'] == $parent && $arrLP[$i]['id'] != $id) {
                if ($extra_info['previous_item_id'] == $arrLP[$i]['id'])
                    $selected = 'selected="selected" ';
                elseif ($action == 'add') $selected = 'selected="selected" ';
                else
                    $selected = '';

                $return .= '<option ' . $selected . 'value="' . $arrLP[$i]['id'] . '">' . get_lang('After') . ' "' . $arrLP[$i]['title'] . '"</option>';
            }
        }

        $return .= '</select>';
        $return .= '</td>';
        $return .= '</tr>';

        if ($action != 'move') {
            $return .= '<tr>';
            $return .= '<td class="label"><label for="idTitle">' . get_lang('Title') . ' :</label></td>';
            $return .= '<td class="input"><input id="idTitle" name="title" type="text" value="' . $item_title . '" /></td>';
            $return .= '</tr>';
            $id_prerequisite = 0;
            if (is_array($arrLP) && count($arrLP) > 0) {
                foreach ($arrLP as $key => $value) {
                    if ($value['id'] == $id) {
                        $id_prerequisite = $value['prerequisite'];
                        break;
                    }
                }

                $arrHide = array ();
                for ($i = 0; $i < count($arrLP); $i++) {
                    if ($arrLP[$i]['id'] != $id && $arrLP[$i]['item_type'] != 'dokeos_chapter') {
                        if ($extra_info['previous_item_id'] == $arrLP[$i]['id'])
                            $s_selected_position = $arrLP[$i]['id'];
                        elseif ($action == 'add') $s_selected_position = 0;
                        $arrHide[$arrLP[$i]['id']]['value'] = $arrLP[$i]['title'];

                    }
                }
            }
        }

        $return .= '<tr>';
        $return .= '<td>&nbsp; </td><td><button class="save" name="submit_button" action="edit" type="submit">' . get_lang('SaveHotpotatoes') . '</button></td>';
        $return .= '</tr>';
        $return .= '</table>';

        if ($action == 'move') {
            $return .= '<input name="title" type="hidden" value="' . $item_title . '" />';
            $return .= '<input name="description" type="hidden" value="' . $item_description . '" />';
        }

        if (is_numeric($extra_info)) {
            $return .= '<input name="path" type="hidden" value="' . $extra_info . '" />';
        } elseif (is_array($extra_info)) {
            $return .= '<input name="path" type="hidden" value="' . $extra_info['path'] . '" />';
        }
        $return .= '<input name="type" type="hidden" value="' . TOOL_HOTPOTATOES . '" />';
        $return .= '<input name="post_time" type="hidden" value="' . time() . '" />';
        $return .= '</form>';

        return $return;
    }

    /**
     * Return the form to display the forum edit/add option
     * @param	string	Action (add/edit)
     * @param	integer	ID of the lp_item if already exists
     * @param	mixed	Forum ID or title
     * @return	string	HTML form
     */
    public function display_forum_form($action = 'add', $id = 0, $extra_info = '')
    {
        $course_id = api_get_course_int_id();
        $tbl_lp_item = Database :: get_course_table(TABLE_LP_ITEM);
        $tbl_forum = Database :: get_course_table(TABLE_FORUM);

        if ($id != 0 && is_array($extra_info)) {
            $item_title = stripslashes($extra_info['title']);
        } elseif (is_numeric($extra_info)) {
            $sql = "SELECT forum_title as title, forum_comment as comment
                    FROM " . $tbl_forum . "
                    WHERE c_id = ".$course_id." AND forum_id = " . $extra_info;

            $result = Database::query($sql);
            $row = Database :: fetch_array($result);

            $item_title = $row['title'];
            $item_description = $row['comment'];
        } else {
            $item_title = '';
            $item_description = '';
        }

        $legend = '<legend>';

        if ($id != 0 && is_array($extra_info)) {
            $parent = $extra_info['parent_item_id'];
        } else {
            $parent = 0;
        }

        $sql = "SELECT * FROM " . $tbl_lp_item . "
                WHERE
                    c_id = ".$course_id." AND
                    lp_id = " . $this->lp_id;
        $result = Database::query($sql);
        $arrLP = array();

        while ($row = Database :: fetch_array($result)) {
            $arrLP[] = array (
                'id' => $row['id'],
                'item_type' => $row['item_type'],
                'title' => $row['title'],
                'path' => $row['path'],
                'description' => $row['description'],
                'parent_item_id' => $row['parent_item_id'],
                'previous_item_id' => $row['previous_item_id'],
                'next_item_id' => $row['next_item_id'],
                'display_order' => $row['display_order'],
                'max_score' => $row['max_score'],
                'min_score' => $row['min_score'],
                'mastery_score' => $row['mastery_score'],
                'prerequisite' => $row['prerequisite']
            );
        }

        $this->tree_array($arrLP);
        $arrLP = $this->arrMenu;
        unset($this->arrMenu);

        if ($action == 'add')
            $legend .= get_lang('CreateTheForum') . '&nbsp;:';
        elseif ($action == 'move') $legend .= get_lang('MoveTheCurrentForum') . '&nbsp;:';
        else
            $legend .= get_lang('EditCurrentForum') . '&nbsp;:';

        $legend .= '</legend>';
        $return = '<div class="sectioncomment">';
        $return .= '<form method="POST">';
        $return .= $legend;
        $return .= '<table class="lp_form">';

        if ($action != 'move') {
            $return .= '<tr>';
            $return .= '<td class="label"><label for="idTitle">' . get_lang('Title') . '</label></td>';
            $return .= '<td class="input"><input id="idTitle" size="44" name="title" type="text" value="' . $item_title . '" class="learnpath_item_form" /></td>';
            $return .= '</tr>';
        }

        $return .= '<tr>';
        $return .= '<td class="label"><label for="idParent">' . get_lang('Parent') . '</label></td>';
        $return .= '<td class="input">';
        $return .= '<select id="idParent" style="width:100%;" name="parent" onChange="javascript: load_cbo(this.value);" class="learnpath_item_form" size="1">';
        $return .= '<option class="top" value="0">' . $this->name . '</option>';
        $arrHide = array(
            $id
        );

        //$parent_item_id = $_SESSION['parent_item_id'];
        for ($i = 0; $i < count($arrLP); $i++) {
            if ($action != 'add') {
                if (($arrLP[$i]['item_type'] == 'dokeos_module' || $arrLP[$i]['item_type'] == 'dokeos_chapter' || $arrLP[$i]['item_type'] == 'dir') && !in_array($arrLP[$i]['id'], $arrHide) && !in_array($arrLP[$i]['parent_item_id'], $arrHide)) {
                    $return .= '<option ' . (($parent == $arrLP[$i]['id']) ? 'selected="selected" ' : '') . 'style="padding-left:' . ($arrLP[$i]['depth'] * 10) . 'px;" value="' . $arrLP[$i]['id'] . '">' . $arrLP[$i]['title'] . '</option>';
                } else {
                    $arrHide[] = $arrLP[$i]['id'];
                }
            } else {
                if ($arrLP[$i]['item_type'] == 'dokeos_module' || $arrLP[$i]['item_type'] == 'dokeos_chapter' || $arrLP[$i]['item_type'] == 'dir')
                    $return .= '<option ' . (($parent == $arrLP[$i]['id']) ? 'selected="selected" ' : '') . 'style="padding-left:' . ($arrLP[$i]['depth'] * 10) . 'px;" value="' . $arrLP[$i]['id'] . '">' . $arrLP[$i]['title'] . '</option>';
            }
        }
        if (is_array($arrLP)) {
            reset($arrLP);
        }

        $return .= '</select>';
        $return .= '</td>';
        $return .= '</tr>';
        $return .= '<tr>';
        $return .= '<td class="label"><label for="previous">' . get_lang('Position') . '</label></td>';
        $return .= '<td class="input">';
        $return .= '<select id="previous" name="previous" style="width:100%;" size="1" class="learnpath_item_form">';
        $return .= '<option class="top" value="0">' . get_lang('FirstPosition') . '</option>';

        for ($i = 0; $i < count($arrLP); $i++) {
            if ($arrLP[$i]['parent_item_id'] == $parent && $arrLP[$i]['id'] != $id) {
                if ($extra_info['previous_item_id'] == $arrLP[$i]['id'])
                    $selected = 'selected="selected" ';
                elseif ($action == 'add') $selected = 'selected="selected" ';
                else
                    $selected = '';

                $return .= '<option ' . $selected . 'value="' . $arrLP[$i]['id'] . '">' .
                    get_lang('After') . ' "' . $arrLP[$i]['title'] . '"</option>';
            }
        }

        $return .= '</select>';
        $return .= '</td>';
        $return .= '</tr>';
        if ($action != 'move') {
            $return .= '<tr>';
            $return .= '</tr>';
            $id_prerequisite = 0;
            if (is_array($arrLP)) {
                foreach ($arrLP as $key => $value) {
                    if ($value['id'] == $id) {
                        $id_prerequisite = $value['prerequisite'];
                        break;
                    }
                }
            }

            $arrHide = array();
            for ($i = 0; $i < count($arrLP); $i++) {
                if ($arrLP[$i]['id'] != $id && $arrLP[$i]['item_type'] != 'dokeos_chapter') {
                    if ($extra_info['previous_item_id'] == $arrLP[$i]['id'])
                        $s_selected_position = $arrLP[$i]['id'];
                    elseif ($action == 'add') $s_selected_position = 0;
                    $arrHide[$arrLP[$i]['id']]['value'] = $arrLP[$i]['title'];
                }
            }
            $return .= '</tr>';
        }
        $return .= '<tr>';

        if ($action == 'add') {
            $return .= '<td>&nbsp;</td><td><button class="save" name="submit_button" type="submit"> ' . get_lang('AddForumToCourse') . ' </button></td>';
        } else {
            $return .= '<td>&nbsp;</td><td><button class="save" name="submit_button" type="submit"> ' . get_lang('EditCurrentForum') . ' </button></td>';
        }
        $return .= '</tr>';
        $return .= '</table>';

        if ($action == 'move') {
            $return .= '<input name="title" type="hidden" value="' . $item_title . '" />';
            $return .= '<input name="description" type="hidden" value="' . $item_description . '" />';
        }

        if (is_numeric($extra_info)) {
            $return .= '<input name="path" type="hidden" value="' . $extra_info . '" />';
        } elseif (is_array($extra_info)) {
            $return .= '<input name="path" type="hidden" value="' . $extra_info['path'] . '" />';
        }
        $return .= '<input name="type" type="hidden" value="' . TOOL_FORUM . '" />';
        $return .= '<input name="post_time" type="hidden" value="' . time() . '" />';
        $return .= '</form>';
        $return .= '</div>';

        return $return;
    }

    /**
     * Return HTML form to add/edit forum threads
     * @param	string	Action (add/edit)
     * @param	integer	Item ID if already exists in learning path
     * @param	mixed	Extra information (thread ID if integer)
     * @return 	string	HTML form
     */
    public function display_thread_form($action = 'add', $id = 0, $extra_info = '')
    {
        $course_id = api_get_course_int_id();
        if (empty($course_id)) {
            return null;
        }
        $tbl_lp_item = Database :: get_course_table(TABLE_LP_ITEM);
        $tbl_forum = Database :: get_course_table(TABLE_FORUM_THREAD);

        if ($id != 0 && is_array($extra_info)) {
            $item_title = stripslashes($extra_info['title']);
        } elseif (is_numeric($extra_info)) {
            $sql = "SELECT thread_title as title FROM $tbl_forum
                    WHERE c_id = $course_id AND thread_id = " . $extra_info;

            $result = Database::query($sql);
            $row = Database :: fetch_array($result);

            $item_title = $row['title'];
            $item_description = '';
        } else {
            $item_title = '';
            $item_description = '';
        }

        $return = null;

        if ($id != 0 && is_array($extra_info)) {
            $parent = $extra_info['parent_item_id'];
        } else {
            $parent = 0;
        }

        $sql = "SELECT * FROM " . $tbl_lp_item . "
                WHERE c_id = ".$course_id." AND lp_id = " . $this->lp_id;

        $result = Database::query($sql);

        $arrLP = array ();

        while ($row = Database :: fetch_array($result)) {
            $arrLP[] = array (
                'id' => $row['id'],
                'item_type' => $row['item_type'],
                'title' => $row['title'],
                'path' => $row['path'],
                'description' => $row['description'],
                'parent_item_id' => $row['parent_item_id'],
                'previous_item_id' => $row['previous_item_id'],
                'next_item_id' => $row['next_item_id'],
                'display_order' => $row['display_order'],
                'max_score' => $row['max_score'],
                'min_score' => $row['min_score'],
                'mastery_score' => $row['mastery_score'],
                'prerequisite' => $row['prerequisite']
            );
        }

        $this->tree_array($arrLP);
        $arrLP = $this->arrMenu;
        unset ($this->arrMenu);

        $return .= '<form method="POST">';
        if ($action == 'add')
            $return .= '<legend>' . get_lang('CreateTheForum') . '</legend>';
        elseif ($action == 'move') $return .= '<p class="lp_title">' . get_lang('MoveTheCurrentForum') . '&nbsp;:</p>';
        else
            $return .= '<legend>' . get_lang('EditCurrentForum') . '</legend>';

        $return .= '<table cellpadding="0" cellspacing="0" class="lp_form">';
        $return .= '<tr>';
        $return .= '<td class="label"><label for="idParent">' . get_lang('Parent') . '</label></td>';
        $return .= '<td class="input">';
        $return .= '<select id="idParent" name="parent" onChange="javascript: load_cbo(this.value);" size="1">';
        $return .= '<option class="top" value="0">' . $this->name . '</option>';
        $arrHide = array (
            $id
        );

        for ($i = 0; $i < count($arrLP); $i++) {
            if ($action != 'add') {
                if (($arrLP[$i]['item_type'] == 'dokeos_module' || $arrLP[$i]['item_type'] == 'dokeos_chapter' || $arrLP[$i]['item_type'] == 'dir') && !in_array($arrLP[$i]['id'], $arrHide) && !in_array($arrLP[$i]['parent_item_id'], $arrHide)) {
                    $return .= '<option ' . (($parent == $arrLP[$i]['id']) ? 'selected="selected" ' : '') . 'style="padding-left:' . ($arrLP[$i]['depth'] * 10) . 'px;" value="' . $arrLP[$i]['id'] . '">' . $arrLP[$i]['title'] . '</option>';
                } else {
                    $arrHide[] = $arrLP[$i]['id'];
                }
            } else {
                if ($arrLP[$i]['item_type'] == 'dokeos_module' || $arrLP[$i]['item_type'] == 'dokeos_chapter' || $arrLP[$i]['item_type'] == 'dir')
                    $return .= '<option ' . (($parent == $arrLP[$i]['id']) ? 'selected="selected" ' : '') . 'style="padding-left:' . ($arrLP[$i]['depth'] * 10) . 'px;" value="' . $arrLP[$i]['id'] . '">' . $arrLP[$i]['title'] . '</option>';
            }
        }

        if ($arrLP != null) {
            reset($arrLP);
        }

        $return .= '</select>';
        $return .= '</td>';
        $return .= '</tr>';
        $return .= '<tr>';
        $return .= '<td class="label"><label for="previous">' . get_lang('Position') . '</label></td>';
        $return .= '<td class="input">';
        $return .= '<select id="previous" name="previous" size="1">';
        $return .= '<option class="top" value="0">' . get_lang('FirstPosition') . '</option>';
        for ($i = 0; $i < count($arrLP); $i++) {
            if ($arrLP[$i]['parent_item_id'] == $parent && $arrLP[$i]['id'] != $id) {
                if ($extra_info['previous_item_id'] == $arrLP[$i]['id'])
                    $selected = 'selected="selected" ';
                elseif ($action == 'add') $selected = 'selected="selected" ';
                else
                    $selected = '';

                $return .= '<option ' . $selected . 'value="' . $arrLP[$i]['id'] . '">' . get_lang('After') . ' "' . $arrLP[$i]['title'] . '"</option>';
            }
        }
        $return .= '</select>';
        $return .= '</td>';
        $return .= '</tr>';
        if ($action != 'move') {
            $return .= '<tr>';
            $return .= '<td class="label"><label for="idTitle">' . get_lang('Title') . '</label></td>';
            $return .= '<td class="input"><input id="idTitle" name="title" type="text" value="' . $item_title . '" /></td>';
            $return .= '</tr>';
            $return .= '<tr>';
            $return .= '</tr>';

            $id_prerequisite = 0;
            if ($arrLP != null) {
                foreach ($arrLP as $key => $value) {
                    if ($value['id'] == $id) {
                        $id_prerequisite = $value['prerequisite'];
                        break;
                    }
                }
            }

            $arrHide = array();
            for ($i = 0; $i < count($arrLP); $i++) {
                if ($arrLP[$i]['id'] != $id && $arrLP[$i]['item_type'] != 'dokeos_chapter') {
                    if ($extra_info['previous_item_id'] == $arrLP[$i]['id'])
                        $s_selected_position = $arrLP[$i]['id'];
                    elseif ($action == 'add') $s_selected_position = 0;
                    $arrHide[$arrLP[$i]['id']]['value'] = $arrLP[$i]['title'];

                }
            }

            $return .= '<tr>';
            $return .= '<td class="label"><label for="idPrerequisites">' . get_lang('LearnpathPrerequisites') . '</label></td>';
            $return .= '<td class="input"><select name="prerequisites" id="prerequisites"><option value="0">' . get_lang('NoPrerequisites') . '</option>';

            foreach ($arrHide as $key => $value) {
                if ($key == $s_selected_position && $action == 'add') {
                    $return .= '<option value="' . $key . '" selected="selected">' . $value['value'] . '</option>';
                }
                elseif ($key == $id_prerequisite && $action == 'edit') {
                    $return .= '<option value="' . $key . '" selected="selected">' . $value['value'] . '</option>';
                } else {
                    $return .= '<option value="' . $key . '">' . $value['value'] . '</option>';
                }
            }
            $return .= "</select></td>";
            $return .= '</tr>';

        }
        $return .= '<tr>';
        $return .= '<td></td><td>
                    <button class="save" name="submit_button" type="submit" value="'.get_lang('Ok').'" />'.get_lang('Ok').'</button></td>';
        $return .= '</tr>';
        $return .= '</table>';

        if ($action == 'move') {
            $return .= '<input name="title" type="hidden" value="' . $item_title . '" />';
            $return .= '<input name="description" type="hidden" value="' . $item_description . '" />';
        }

        if (is_numeric($extra_info)) {
            $return .= '<input name="path" type="hidden" value="' . $extra_info . '" />';
        }
        elseif (is_array($extra_info)) {
            $return .= '<input name="path" type="hidden" value="' . $extra_info['path'] . '" />';
        }

        $return .= '<input name="type" type="hidden" value="' . TOOL_THREAD . '" />';
        $return .= '<input name="post_time" type="hidden" value="' . time() . '" />';
        $return .= '</form>';
        $return .= '</div>';

        return $return;
    }

    /**
     * Return the HTML form to display an item (generally a section/module item)
     * @param	string	Item type (module/dokeos_module)
     * @param	string	Title (optional, only when creating)
     * @param	string	Action ('add'/'edit')
     * @param	integer	lp_item ID
     * @param	mixed	Extra info
     * @return	string 	HTML form
     */
    public function display_item_form($item_type, $title = '', $action = 'add_item', $id = 0, $extra_info = 'new')
    {
        $course_id = api_get_course_int_id();
        $_course = api_get_course_info();

        global $charset;

        $tbl_lp_item = Database :: get_course_table(TABLE_LP_ITEM);

        if ($id != 0 && is_array($extra_info)) {
            $item_title 		= $extra_info['title'];
            $item_description 	= $extra_info['description'];
            $item_path = api_get_path(WEB_COURSE_PATH) . $_course['path'] . '/scorm/' . $this->path . '/' . stripslashes($extra_info['path']);
            $item_path_fck = '/scorm/' . $this->path . '/' . stripslashes($extra_info['path']);
        } else {
            $item_title = '';
            $item_description = '';
            $item_path_fck = '';
        }

        if ($id != 0 && is_array($extra_info)) {
            $parent = $extra_info['parent_item_id'];
        } else {
            $parent = 0;
        }

        $id  = intval($id);
        $sql = "SELECT * FROM " . $tbl_lp_item . "
                WHERE
                    c_id = ".$course_id." AND
                    lp_id = " . $this->lp_id . " AND
                    id != $id";

        if ($item_type == 'module')
            $sql .= " AND parent_item_id = 0";

        $result = Database::query($sql);
        $arrLP = array ();

        while ($row = Database :: fetch_array($result)) {
            $arrLP[] = array(
                'id' => $row['id'],
                'item_type' => $row['item_type'],
                'title' => $row['title'],
                'path' => $row['path'],
                'description' => $row['description'],
                'parent_item_id' => $row['parent_item_id'],
                'previous_item_id' => $row['previous_item_id'],
                'next_item_id' => $row['next_item_id'],
                'max_score' => $row['max_score'],
                'min_score' => $row['min_score'],
                'mastery_score' => $row['mastery_score'],
                'prerequisite' => $row['prerequisite'],
                'display_order' => $row['display_order']
            );
        }

        $this->tree_array($arrLP);

        $arrLP = isset($this->arrMenu) ? $this->arrMenu : null;

        unset ($this->arrMenu);

        $gradebook = isset($_GET['gradebook']) ? Security :: remove_XSS($_GET['gradebook']) : null;

        $url = api_get_self() . '?' .api_get_cidreq().'&gradeboook='.$gradebook.'&action='.$action.'&type='.$item_type.'&lp_id='.$this->lp_id;

        $form = new FormValidator('form', 'POST',  $url);

        $defaults['title'] = api_html_entity_decode($item_title, ENT_QUOTES, $charset);
        $defaults['description'] = $item_description;

        $form->addElement('header', $title);

        //$arrHide = array($id);
        $arrHide[0]['value'] = Security :: remove_XSS($this->name);
        $arrHide[0]['padding'] = 3;
        $charset = api_get_system_encoding();

        if ($item_type != 'module' && $item_type != 'dokeos_module') {
            for ($i = 0; $i < count($arrLP); $i++) {
                if ($action != 'add') {
                    if (($arrLP[$i]['item_type'] == 'dokeos_module' || $arrLP[$i]['item_type'] == 'dokeos_chapter' || $arrLP[$i]['item_type'] == 'dir') && !in_array($arrLP[$i]['id'], $arrHide) && !in_array($arrLP[$i]['parent_item_id'], $arrHide)) {
                        $arrHide[$arrLP[$i]['id']]['value'] = $arrLP[$i]['title'];
                        $arrHide[$arrLP[$i]['id']]['padding'] = 3 + $arrLP[$i]['depth'] * 10;
                        if ($parent == $arrLP[$i]['id']) {
                            $s_selected_parent = $arrHide[$arrLP[$i]['id']];
                        }
                    }
                } else {
                    if ($arrLP[$i]['item_type'] == 'dokeos_module' || $arrLP[$i]['item_type'] == 'dokeos_chapter' || $arrLP[$i]['item_type'] == 'dir') {
                        $arrHide[$arrLP[$i]['id']]['value'] = $arrLP[$i]['title'];
                        $arrHide[$arrLP[$i]['id']]['padding'] = 3 + $arrLP[$i]['depth'] * 10;
                        if ($parent == $arrLP[$i]['id']) {
                            $s_selected_parent = $arrHide[$arrLP[$i]['id']];
                        }
                    }
                }
            }

            if ($action != 'move') {
                $form->addElement('text', 'title', get_lang('Title'));
                $form->applyFilter('title', 'html_filter');
                $form->addRule('title', get_lang('ThisFieldIsRequired'), 'required');
            } else {
                $form->addElement('hidden', 'title');
            }

            $parent_select = $form->addElement('select', 'parent', get_lang('Parent'), '', array('id' => 'idParent', 'onchange' => "javascript: load_cbo(this.value);"));

            foreach ($arrHide as $key => $value) {
                $parent_select->addOption($value['value'], $key, 'style="padding-left:' . $value['padding'] . 'px;"');
            }
            if (!empty($s_selected_parent)) {
                $parent_select->setSelected($s_selected_parent);
            }
        }
        if (is_array($arrLP)) {
            reset($arrLP);
        }

        $arrHide = array();

        // POSITION
        for ($i = 0; $i < count($arrLP); $i++) {
            if ($arrLP[$i]['parent_item_id'] == $parent && $arrLP[$i]['id'] != $id) {
                //this is the same!
                if (isset($extra_info['previous_item_id']) && $extra_info['previous_item_id'] == $arrLP[$i]['id']) {
                    $s_selected_position = $arrLP[$i]['id'];
                } elseif ($action == 'add') {
                    $s_selected_position = $arrLP[$i]['id'];
                }

                $arrHide[$arrLP[$i]['id']]['value'] = get_lang('After') . ' "' . $arrLP[$i]['title'] . '"';
            }
        }

        $position = $form->addElement('select', 'previous', get_lang('Position'), '', array('id' => 'previous'));
        $padding = isset($value['padding']) ? $value['padding'] : 0;
        $position->addOption(get_lang('FirstPosition'), 0, 'style="padding-left:' . $padding . 'px;"');

        foreach ($arrHide as $key => $value) {
            $position->addOption($value['value'] . '"', $key, 'style="padding-left:' . $padding . 'px;"');
        }

        if (!empty ($s_selected_position)) {
            $position->setSelected($s_selected_position);
        }

        if (is_array($arrLP)) {
            reset($arrLP);
        }

        $form->addButtonSave(get_lang('SaveSection'), 'submit_button');

        if ($item_type == 'module' || $item_type == 'dokeos_module') {
            $form->addElement('hidden', 'parent', '0');
        }
        //fix in order to use the tab
        if ($item_type == 'chapter') {
            $form->addElement('hidden', 'type', 'chapter');
        }

        $extension = null;
        if (!empty($item_path)) {
            $extension = pathinfo($item_path, PATHINFO_EXTENSION);
        }

        //assets can't be modified

        //$item_type == 'asset' ||
        if (( $item_type == 'sco') && ($extension == 'html' || $extension == 'htm')) {

            if ($item_type == 'sco') {
                $form->addElement('html', '<script type="text/javascript">alert("' . get_lang('WarningWhenEditingScorm') . '")</script>');
            }
            $renderer = $form->defaultRenderer();
            $renderer->setElementTemplate('<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{label}<br />{element}', 'content_lp');

            $relative_prefix = '';

            $editor_config = array( 'ToolbarSet' 			=> 'LearningPathDocuments',
                'Width' 				=> '100%',
                'Height' 				=> '500',
                'FullPage' 				=> true,
                'CreateDocumentDir' 	=> $relative_prefix,
                'CreateDocumentWebDir' 	=> api_get_path(WEB_COURSE_PATH) . api_get_course_path().'/scorm/',
                'BaseHref' 				=> api_get_path(WEB_COURSE_PATH) . api_get_course_path().$item_path_fck
            );

            $form->addElement('html_editor', 'content_lp', '', null, $editor_config);
            $content_path = (api_get_path(SYS_COURSE_PATH).api_get_course_path().$item_path_fck);
            //$defaults['content_lp'] = file_get_contents($item_path);
            $defaults['content_lp'] = file_get_contents($content_path);
        }

        $form->addElement('hidden', 'type', 'dokeos_' . $item_type);
        $form->addElement('hidden', 'post_time', time());
        $form->setDefaults($defaults);
        return $form->return_form();
    }

    /**
     * Returns the form to update or create a document
     * @param	string	Action (add/edit)
     * @param	integer	ID of the lp_item (if already exists)
     * @param	mixed	Integer if document ID, string if info ('new')
     * @return	string	HTML form
     */
    public function display_document_form($action = 'add', $id = 0, $extra_info = 'new')
    {
        $course_id = api_get_course_int_id();
        $_course = api_get_course_info();
        $tbl_lp_item = Database :: get_course_table(TABLE_LP_ITEM);
        $tbl_doc = Database :: get_course_table(TABLE_DOCUMENT);

        $no_display_edit_textarea = false;

        //If action==edit document
        //We don't display the document form if it's not an editable document (html or txt file)
        if ($action == "edit") {
            if (is_array($extra_info)) {
                $path_parts = pathinfo($extra_info['dir']);
                if ($path_parts['extension'] != "txt" && $path_parts['extension'] != "html") {
                    $no_display_edit_textarea = true;
                }
            }
        }
        $no_display_add = false;

        // If action==add an existing document
        // We don't display the document form if it's not an editable document (html or txt file).
        if ($action == "add") {
            if (is_numeric($extra_info)) {
                $sql_doc = "SELECT path FROM " . $tbl_doc . "
                            WHERE c_id = ".$course_id." AND id = " . intval($extra_info);
                $result = Database::query($sql_doc);
                $path_file = Database :: result($result, 0, 0);
                $path_parts = pathinfo($path_file);
                if ($path_parts['extension'] != "txt" && $path_parts['extension'] != "html") {
                    $no_display_add = true;
                }
            }
        }
        if ($id != 0 && is_array($extra_info)) {
            $item_title = stripslashes($extra_info['title']);
            $item_description = stripslashes($extra_info['description']);
            $item_terms = stripslashes($extra_info['terms']);
            if (empty ($item_title)) {
                $path_parts = pathinfo($extra_info['path']);
                $item_title = stripslashes($path_parts['filename']);
            }
        } elseif (is_numeric($extra_info)) {
            $sql_doc = "SELECT path, title FROM " . $tbl_doc . "
                        WHERE
                            c_id = ".$course_id." AND
                            id = " . intval($extra_info);

            $result = Database::query($sql_doc);
            $row 	= Database::fetch_array($result);
            $item_title = $row['title'];
            $item_title = str_replace('_', ' ', $item_title);
            if (empty ($item_title)) {
                $path_parts = pathinfo($row['path']);
                $item_title = stripslashes($path_parts['filename']);
            }
        } else {
            $item_title = '';
            $item_description = '';
        }
        $return = '<legend>';

        if ($id != 0 && is_array($extra_info)) {
            $parent = $extra_info['parent_item_id'];
        } else {
            $parent = 0;
        }

        $sql = "SELECT * FROM " . $tbl_lp_item . "
                WHERE c_id = ".$course_id." AND lp_id = " . $this->lp_id;

        $result = Database::query($sql);
        $arrLP = array ();
        while ($row = Database :: fetch_array($result)) {
            $arrLP[] = array(
                'id' => $row['id'],
                'item_type' => $row['item_type'],
                'title' => $row['title'],
                'path' => $row['path'],
                'description' => $row['description'],
                'parent_item_id' => $row['parent_item_id'],
                'previous_item_id' => $row['previous_item_id'],
                'next_item_id' => $row['next_item_id'],
                'display_order' => $row['display_order'],
                'max_score' => $row['max_score'],
                'min_score' => $row['min_score'],
                'mastery_score' => $row['mastery_score'],
                'prerequisite' => $row['prerequisite']
            );
        }

        $this->tree_array($arrLP);
        $arrLP = $this->arrMenu;
        unset ($this->arrMenu);

        if ($action == 'add') {
            $return .= get_lang('CreateTheDocument');
        } elseif ($action == 'move') {
            $return .= get_lang('MoveTheCurrentDocument');
        } else {
            $return .= get_lang('EditTheCurrentDocument');
        }

        $return .= '</legend>';

        if (isset ($_GET['edit']) && $_GET['edit'] == 'true') {
            $return .= Display :: return_warning_message('<strong>' . get_lang('Warning') . ' !</strong><br />' . get_lang('WarningEditingDocument'), false);
        }
        $form = new FormValidator('form', 'POST', api_get_self() . '?' .$_SERVER['QUERY_STRING'], '', array('enctype'=> "multipart/form-data"));
        $defaults['title'] = Security :: remove_XSS($item_title);
        if (empty($item_title)) {
            $defaults['title'] = Security::remove_XSS($item_title);
        }
        $defaults['description'] = $item_description;
        $form->addElement('html', $return);
        if ($action != 'move') {
            $form->addElement('text', 'title', get_lang('Title'), array('id' => 'idTitle', 'class' => 'span4'));
            $form->applyFilter('title', 'html_filter');
        }

        $arrHide[0]['value'] = $this->name;
        $arrHide[0]['padding'] = 3;

        for ($i = 0; $i < count($arrLP); $i++) {
            if ($action != 'add') {
                if (($arrLP[$i]['item_type'] == 'dokeos_module' || $arrLP[$i]['item_type'] == 'dokeos_chapter' || $arrLP[$i]['item_type'] == 'dir') && !in_array($arrLP[$i]['id'], $arrHide) && !in_array($arrLP[$i]['parent_item_id'], $arrHide)) {
                    $arrHide[$arrLP[$i]['id']]['value'] = $arrLP[$i]['title'];
                    $arrHide[$arrLP[$i]['id']]['padding'] = 3 + $arrLP[$i]['depth'] * 10;
                    if ($parent == $arrLP[$i]['id']) {
                        $s_selected_parent = $arrHide[$arrLP[$i]['id']];
                    }
                }
            } else {
                if ($arrLP[$i]['item_type'] == 'dokeos_module' || $arrLP[$i]['item_type'] == 'dokeos_chapter' || $arrLP[$i]['item_type'] == 'dir') {
                    $arrHide[$arrLP[$i]['id']]['value'] = $arrLP[$i]['title'];
                    $arrHide[$arrLP[$i]['id']]['padding'] = 3 + $arrLP[$i]['depth'] * 10;
                    if ($parent == $arrLP[$i]['id']) {
                        $s_selected_parent = $arrHide[$arrLP[$i]['id']];
                    }
                }
            }
        }

        $parent_select = $form->addElement('select', 'parent', get_lang('Parent'), '', 'class="learnpath_item_form" id="idParent" style="width:40%;" onchange="javascript: load_cbo(this.value);"');
        $my_count=0;
        foreach ($arrHide as $key => $value) {
            if ($my_count!=0) {
                // The LP name is also the first section and is not in the same charset like the other sections.
                $value['value'] = Security :: remove_XSS($value['value']);
                $parent_select->addOption($value['value'], $key, 'style="padding-left:' . $value['padding'] . 'px;"');
            } else {
                $value['value'] = Security :: remove_XSS($value['value']);
                $parent_select->addOption($value['value'], $key, 'style="padding-left:' . $value['padding'] . 'px;"');
            }
            $my_count++;
        }

        if (!empty($id)) {
            $parent_select->setSelected($parent);
        } else {
            $parent_item_id = $_SESSION['parent_item_id'];
            $parent_select->setSelected($parent_item_id);
        }

        if (is_array($arrLP)) {
            reset($arrLP);
        }

        $arrHide = array();
        $s_selected_position = null;

        //POSITION
        for ($i = 0; $i < count($arrLP); $i++) {
            if ($arrLP[$i]['parent_item_id'] == $parent && $arrLP[$i]['id'] != $id) {
                if (isset($extra_info['previous_item_id']) && $extra_info['previous_item_id'] == $arrLP[$i]['id'])
                    $s_selected_position = $arrLP[$i]['id'];
                elseif ($action == 'add') $s_selected_position = $arrLP[$i]['id'];
                $arrHide[$arrLP[$i]['id']]['value'] = get_lang('After') . ' "' . $arrLP[$i]['title'] . '"';
            }
        }

        $position = $form->addElement('select', 'previous', get_lang('Position'), '', 'id="previous" class="learnpath_item_form" style="width:40%;"');
        $position->addOption(get_lang('FirstPosition'), 0);

        foreach ($arrHide as $key => $value) {
            $padding = isset($value['padding']) ? $value['padding']: 0;
            $position->addOption($value['value'], $key, 'style="padding-left:' . $padding . 'px;"');
        }
        $position->setSelected($s_selected_position);

        if (is_array($arrLP)) {
            reset($arrLP);
        }

        if ($action != 'move') {
            $id_prerequisite = 0;
            if (is_array($arrLP)) {
                foreach ($arrLP as $key => $value) {
                    if ($value['id'] == $id) {
                        $id_prerequisite = $value['prerequisite'];
                        break;
                    }
                }
            }

            $arrHide = array();

            for ($i = 0; $i < count($arrLP); $i++) {
                if ($arrLP[$i]['id'] != $id && $arrLP[$i]['item_type'] != 'dokeos_chapter') {
                    if (isset($extra_info['previous_item_id']) && $extra_info['previous_item_id'] == $arrLP[$i]['id'])
                        $s_selected_position = $arrLP[$i]['id'];
                    elseif ($action == 'add') $s_selected_position = $arrLP[$i]['id'];

                    $arrHide[$arrLP[$i]['id']]['value'] = $arrLP[$i]['title'];

                }
            }

            if (!$no_display_add) {
                if (($extra_info == 'new' || $extra_info['item_type'] == TOOL_DOCUMENT || $_GET['edit'] == 'true')) {
                    if (isset ($_POST['content']))
                        $content = stripslashes($_POST['content']);
                    elseif (is_array($extra_info)) {
                        //If it's an html document or a text file
                        if (!$no_display_edit_textarea) {
                            $content = $this->display_document($extra_info['path'], false, false);
                        }
                    } elseif (is_numeric($extra_info))
                        $content = $this->display_document($extra_info, false, false);
                    else
                        $content = '';

                    if (!$no_display_edit_textarea) {
                        // We need to calculate here some specific settings for the online editor.
                        // The calculated settings work for documents in the Documents tool
                        // (on the root or in subfolders).
                        // For documents in native scorm packages it is unclear whether the
                        // online editor should be activated or not.

                        // A new document, it is in the root of the repository.
                        $relative_path 	 = '';
                        $relative_prefix = '';

                        if (is_array($extra_info) && $extra_info != 'new') {
                            // The document already exists. Whe have to determine its relative path towards the repository root.
                            $relative_path = explode('/', $extra_info['dir']);
                            $cnt = count($relative_path) - 2;
                            if ($cnt < 0) {
                                $cnt = 0;
                            }
                            $relative_prefix = str_repeat('../', $cnt);
                            $relative_path 	 = array_slice($relative_path, 1, $cnt);
                            $relative_path 	 = implode('/', $relative_path);
                            if (strlen($relative_path) > 0) {
                                $relative_path = $relative_path . '/';
                            }
                        } else {
                            $result = $this->generate_lp_folder($_course);
                            $relative_path = api_substr($result['dir'], 1, strlen($result['dir']));
                            $relative_prefix = '../../';
                        }

                        $editor_config = array(
                            'ToolbarSet'=> 'LearningPathDocuments',
                            'Width' 				=> '100%',
                            'Height' 				=> '500',
                            'FullPage' 				=> true,
                            'CreateDocumentDir' 	=> $relative_prefix,
                            'CreateDocumentWebDir' 	=> api_get_path(WEB_COURSE_PATH) . api_get_course_path().'/document/',
                            'BaseHref' 				=> api_get_path(WEB_COURSE_PATH) . api_get_course_path().'/document/'.$relative_path
                        );

                        if ($_GET['action'] == 'add_item') {
                            $class = 'add';
                            $text = get_lang('LPCreateDocument');
                        } else {
                            if ($_GET['action'] == 'edit_item') {
                                $class = 'save';
                                $text = get_lang('SaveDocument');
                            }
                        }

                        $form->addButtonSave($text, 'submit_button');
                        $renderer = $form->defaultRenderer();
                        $renderer->setElementTemplate('&nbsp;{label}{element}', 'content_lp');
                        $form->addElement('html', '<div class="editor-lp">');
                        $form->addHtmlEditor('content_lp', null, null, true, $editor_config, true);
                        $form->addElement('html', '</div>');
                        $defaults['content_lp'] = $content;
                    }
                } elseif (is_numeric($extra_info)) {
                    $form->addButtonSave(get_lang('SaveDocument'), 'submit_button');

                    $return = $this->display_document($extra_info, true, true, true);
                    $form->addElement('html', $return);
                }
            }
        }

        if ($action == 'move') {
            $form->addElement('hidden', 'title', $item_title);
            $form->addElement('hidden', 'description', $item_description);
        }
        if (is_numeric($extra_info)) {
            $form->addButtonSave(get_lang('SaveDocument'), 'submit_button');
            $form->addElement('hidden', 'path', $extra_info);
        } elseif (is_array($extra_info)) {
            $form->addButtonSave(get_lang('SaveDocument'), 'submit_button');
            $form->addElement('hidden', 'path', $extra_info['path']);
        }
        $form->addElement('hidden', 'type', TOOL_DOCUMENT);
        $form->addElement('hidden', 'post_time', time());
        $form->setDefaults($defaults);

        return $form->return_form();
    }

    /**
     * Return HTML form to add/edit a link item
     * @param string	$action (add/edit)
     * @param integer	$id Item ID if exists
     * @param mixed		$extra_info
     * @return	string	HTML form
     */
    public function display_link_form($action = 'add', $id = 0, $extra_info = '')
    {
        $course_id = api_get_course_int_id();
        $tbl_lp_item = Database :: get_course_table(TABLE_LP_ITEM);
        $tbl_link = Database :: get_course_table(TABLE_LINK);

        if ($id != 0 && is_array($extra_info)) {
            $item_title = stripslashes($extra_info['title']);
            $item_description = stripslashes($extra_info['description']);
            $item_url = stripslashes($extra_info['url']);
        } elseif (is_numeric($extra_info)) {
            $extra_info = intval($extra_info);
            $sql = "SELECT title, description, url FROM " . $tbl_link . "
                    WHERE c_id = ".$course_id." AND id = " . $extra_info;
            $result = Database::query($sql);
            $row = Database :: fetch_array($result);
            $item_title       = $row['title'];
            $item_description = $row['description'];
            $item_url = $row['url'];
        } else {
            $item_title = '';
            $item_description = '';
            $item_url = '';
        }

        $legend = '<legend>';

        if ($id != 0 && is_array($extra_info)) {
            $parent = $extra_info['parent_item_id'];
        } else {
            $parent = 0;
        }

        $sql = "SELECT * FROM " . $tbl_lp_item . "
                WHERE c_id = ".$course_id." AND lp_id = " . $this->lp_id;
        $result = Database::query($sql);
        $arrLP = array();

        while ($row = Database :: fetch_array($result)) {
            $arrLP[] = array(
                'id' => $row['id'],
                'item_type' => $row['item_type'],
                'title' => $row['title'],
                'path' => $row['path'],
                'description' => $row['description'],
                'parent_item_id' => $row['parent_item_id'],
                'previous_item_id' => $row['previous_item_id'],
                'next_item_id' => $row['next_item_id'],
                'display_order' => $row['display_order'],
                'max_score' => $row['max_score'],
                'min_score' => $row['min_score'],
                'mastery_score' => $row['mastery_score'],
                'prerequisite' => $row['prerequisite']
            );
        }

        $this->tree_array($arrLP);
        $arrLP = $this->arrMenu;
        unset ($this->arrMenu);

        if ($action == 'add')
            $legend .= get_lang('CreateTheLink') . '&nbsp;:';
        elseif ($action == 'move') $legend .= get_lang('MoveCurrentLink') . '&nbsp;:';
        else
            $legend .= get_lang('EditCurrentLink') . '&nbsp;:';

        $legend .= '</legend>';

        $return = '<div class="sectioncomment">';
        $return .= '<form method="POST">';
        $return .= $legend;
        $return .= '<table>';

        if ($action != 'move') {
            $return .= '<tr>';
            $return .= '<td class="label"><label for="idTitle">' . get_lang('Title') . '</label></td>';
            $return .= '<td class="input"><input id="idTitle" name="title" size="44" type="text" value="' . $item_title . '" class="learnpath_item_form"/></td>';
            $return .= '</tr>';
        }

        $return .= '<tr>';
        $return .= '<td class="label"><label for="idParent">' . get_lang('Parent') . '</label></td>';
        $return .= '<td class="input">';
        $return .= '<select id="idParent" style="width:100%;" name="parent" onChange="javascript: load_cbo(this.value);" class="learnpath_item_form" size="1">';
        $return .= '<option class="top" value="0">' . $this->name . '</option>';
        $arrHide = array(
            $id
        );

        $parent_item_id = $_SESSION['parent_item_id'];

        for ($i = 0; $i < count($arrLP); $i++) {
            if ($action != 'add') {
                if (($arrLP[$i]['item_type'] == 'dokeos_module' || $arrLP[$i]['item_type'] == 'dokeos_chapter' || $arrLP[$i]['item_type'] == 'dir') && !in_array($arrLP[$i]['id'], $arrHide) && !in_array($arrLP[$i]['parent_item_id'], $arrHide)) {
                    $return .= '<option ' . (($parent == $arrLP[$i]['id']) ? 'selected="selected" ' : '') . 'style="padding-left:' . ($arrLP[$i]['depth'] * 10) . 'px;" value="' . $arrLP[$i]['id'] . '">' . $arrLP[$i]['title'] . '</option>';
                } else {
                    $arrHide[] = $arrLP[$i]['id'];
                }
            } else {
                if ($arrLP[$i]['item_type'] == 'dokeos_module' || $arrLP[$i]['item_type'] == 'dokeos_chapter' || $arrLP[$i]['item_type'] == 'dir')
                    $return .= '<option ' . (($parent_item_id == $arrLP[$i]['id']) ? 'selected="selected" ' : '') . 'style="padding-left:' . ($arrLP[$i]['depth'] * 10) . 'px;" value="' . $arrLP[$i]['id'] . '">' . $arrLP[$i]['title'] . '</option>';
            }
        }

        if (is_array($arrLP)) {
            reset($arrLP);
        }

        $return .= '</select>';
        $return .= '</td>';
        $return .= '</tr>';
        $return .= '<tr>';
        $return .= '<td class="label"><label for="previous">' . get_lang('Position') . '</label></td>';
        $return .= '<td class="input">';

        $return .= '<select id="previous" name="previous" style="width:100%;" size="1" class="learnpath_item_form">';
        $return .= '<option class="top" value="0">' . get_lang('FirstPosition') . '</option>';
        for ($i = 0; $i < count($arrLP); $i++) {
            if ($arrLP[$i]['parent_item_id'] == $parent && $arrLP[$i]['id'] != $id) {
                if ($extra_info['previous_item_id'] == $arrLP[$i]['id'])
                    $selected = 'selected="selected" ';
                elseif ($action == 'add')
                    $selected = 'selected="selected" ';
                else
                    $selected = '';

                $return .= '<option ' . $selected . 'value="' . $arrLP[$i]['id'] . '">' . get_lang('After') . ' "' . $arrLP[$i]['title'] . '"</option>';
            }
        }
        $return .= '</select>';
        $return .= '</td>';
        $return .= '</tr>';

        if ($action != 'move') {
            $return .= '<tr>';
            $return .= '<td class="label"><label for="idURL">' . get_lang('Url') . '</label></td>';
            $return .= '<td class="input"><input' . (is_numeric($extra_info) ? ' disabled="disabled"' : '') . ' id="idURL" name="url" style="width:99%;" type="text" value="' . $item_url . '" class="learnpath_item_form" /></td>';
            $return .= '</tr>';
            $id_prerequisite = 0;
            if (is_array($arrLP)) {
                foreach ($arrLP as $key => $value) {
                    if ($value['id'] == $id) {
                        $id_prerequisite = $value['prerequisite'];
                        break;
                    }
                }
            }

            $arrHide = array();
            for ($i = 0; $i < count($arrLP); $i++) {
                if ($arrLP[$i]['id'] != $id && $arrLP[$i]['item_type'] != 'dokeos_chapter') {
                    if ($extra_info['previous_item_id'] == $arrLP[$i]['id'])
                        $s_selected_position = $arrLP[$i]['id'];
                    elseif ($action == 'add') $s_selected_position = 0;
                    $arrHide[$arrLP[$i]['id']]['value'] = $arrLP[$i]['title'];

                }
            }
            $return .= '</tr>';
        }

        $return .= '<tr>';
        if ($action == 'add') {
            $return .= '<td>&nbsp;</td><td><button class="save" name="submit_button" type="submit">' . get_lang('AddLinkToCourse') . '</button></td>';
        } else {
            $return .= '<td>&nbsp;</td><td><button class="save" name="submit_button" type="submit">' . get_lang('EditCurrentLink') . '</button></td>';
        }
        $return .= '</tr>';
        $return .= '</table>';

        if ($action == 'move') {
            $return .= '<input name="title" type="hidden" value="' . $item_title . '" />';
            $return .= '<input name="description" type="hidden" value="' . $item_description . '" />';
        }

        if (is_numeric($extra_info)) {
            $return .= '<input name="path" type="hidden" value="' . $extra_info . '" />';
        } elseif (is_array($extra_info)) {
            $return .= '<input name="path" type="hidden" value="' . $extra_info['path'] . '" />';
        }
        $return .= '<input name="type" type="hidden" value="' . TOOL_LINK . '" />';
        $return .= '<input name="post_time" type="hidden" value="' . time() . '" />';
        $return .= '</form>';
        $return .= '</div>';

        return $return;
    }

    /**
     * Return HTML form to add/edit a student publication (work)
     * @param	string	Action (add/edit)
     * @param	integer	Item ID if already exists
     * @param	mixed	Extra info (work ID if integer)
     * @return	string	HTML form
     */
    public function display_student_publication_form($action = 'add', $id = 0, $extra_info = '')
    {
        $course_id = api_get_course_int_id();
        $tbl_lp_item = Database :: get_course_table(TABLE_LP_ITEM);
        $tbl_publication = Database :: get_course_table(TABLE_STUDENT_PUBLICATION);

        if ($id != 0 && is_array($extra_info)) {
            $item_title = stripslashes($extra_info['title']);
            $item_description = stripslashes($extra_info['description']);
        } elseif (is_numeric($extra_info)) {
            $extra_info = intval($extra_info);
            $sql = "SELECT title, description
                    FROM " . $tbl_publication . "
                    WHERE c_id = ".$course_id." AND id = " . $extra_info;

            $result = Database::query($sql);
            $row = Database :: fetch_array($result);

            $item_title = $row['title'];
        } else {
            $item_title = get_lang('Student_publication');
        }

        $legend = '<legend>';

        if ($id != 0 && is_array($extra_info)) {
            $parent = $extra_info['parent_item_id'];
        } else {
            $parent = 0;
        }

        $sql = "SELECT * FROM " . $tbl_lp_item . "
                WHERE c_id = ".$course_id." AND lp_id = " . $this->lp_id;

        $result = Database::query($sql);
        $arrLP = array();
        while ($row = Database :: fetch_array($result)) {
            $arrLP[] = array (
                'id' => $row['id'],
                'item_type' => $row['item_type'],
                'title' => $row['title'],
                'path' => $row['path'],
                'description' => $row['description'],
                'parent_item_id' => $row['parent_item_id'],
                'previous_item_id' => $row['previous_item_id'],
                'next_item_id' => $row['next_item_id'],
                'display_order' => $row['display_order'],
                'max_score' => $row['max_score'],
                'min_score' => $row['min_score'],
                'mastery_score' => $row['mastery_score'],
                'prerequisite' => $row['prerequisite']
            );
        }

        $this->tree_array($arrLP);
        $arrLP = $this->arrMenu;
        unset ($this->arrMenu);

        if ($action == 'add') {
            $legend .= get_lang('Student_publication') . '&nbsp;:' . "\n";
        } elseif ($action == 'move') {
            $legend .= get_lang('MoveCurrentStudentPublication') . '&nbsp;:' . "\n";
        } else {
            $legend .= get_lang('EditCurrentStudentPublication') . '&nbsp;:' . "\n";
        }
        $legend .= '</legend>';

        $return = '<div class="sectioncomment">';
        $return .= '<form method="POST">';
        $return .= $legend;
        $return .= '<table class="lp_form">';
        if ($action != 'move') {
            $return .= '<tr>';
            $return .= '<td class="label"><label for="idTitle">' . get_lang('Title') . '</label></td>';
            $return .= '<td class="input"><input id="idTitle" name="title" size="44" type="text" value="' . $item_title . '" class="learnpath_item_form" /></td>';
            $return .= '</tr>';
        }
        $return .= '<tr>';
        $return .= '<td class="label"><label for="idParent">' . get_lang('Parent') . '</label></td>';
        $return .= '<td class="input">';
        $return .= "\t\t\t\t" . '<select id="idParent" name="parent" style="width:100%;" onChange="javascript: load_cbo(this.value);" class="learnpath_item_form" size="1">';
        //$parent_item_id = $_SESSION['parent_item_id'];
        $return .= '<option class="top" value="0">' . $this->name . '</option>';
        $arrHide = array (
            $id
        );

        for ($i = 0; $i < count($arrLP); $i++) {
            if ($action != 'add') {
                if (($arrLP[$i]['item_type'] == 'dokeos_module' || $arrLP[$i]['item_type'] == 'dokeos_chapter' || $arrLP[$i]['item_type'] == 'dir') && !in_array($arrLP[$i]['id'], $arrHide) && !in_array($arrLP[$i]['parent_item_id'], $arrHide)) {
                    $return .= '<option ' . (($parent == $arrLP[$i]['id']) ? 'selected="selected" ' : '') . 'style="padding-left:' . ($arrLP[$i]['depth'] * 10) . 'px;" value="' . $arrLP[$i]['id'] . '">' . $arrLP[$i]['title'] . '</option>';
                } else {
                    $arrHide[] = $arrLP[$i]['id'];
                }
            } else {
                if ($arrLP[$i]['item_type'] == 'dokeos_module' || $arrLP[$i]['item_type'] == 'dokeos_chapter' || $arrLP[$i]['item_type'] == 'dir')
                    $return .= '<option ' . (($parent == $arrLP[$i]['id']) ? 'selected="selected" ' : '') . 'style="padding-left:' . ($arrLP[$i]['depth'] * 10) . 'px;" value="' . $arrLP[$i]['id'] . '">' . $arrLP[$i]['title'] . '</option>';
            }
        }

        if (is_array($arrLP)) {
            reset($arrLP);
        }
        $return .= '</select>';
        $return .= '</td>';
        $return .= '</tr>';
        $return .= '<tr>';
        $return .= '<td class="label"><label for="previous">' . get_lang('Position') . '</label></td>';
        $return .= '<td class="input">';
        $return .= '<select id="previous" name="previous" style="width:100%;" size="1" class="learnpath_item_form">';
        $return .= '<option class="top" value="0">' . get_lang('FirstPosition') . '</option>';
        for ($i = 0; $i < count($arrLP); $i++) {
            if ($arrLP[$i]['parent_item_id'] == $parent && $arrLP[$i]['id'] != $id) {
                if ($extra_info['previous_item_id'] == $arrLP[$i]['id'])
                    $selected = 'selected="selected" ';
                elseif ($action == 'add') $selected = 'selected="selected" ';
                else
                    $selected = '';

                $return .= '<option ' . $selected . 'value="' . $arrLP[$i]['id'] . '">' . get_lang('After') . ' "' . $arrLP[$i]['title'] . '"</option>';
            }
        }
        $return .= '</select>';
        $return .= '</td>';
        $return .= '</tr>';
        if ($action != 'move') {
            $id_prerequisite = 0;
            if (is_array($arrLP)) {
                foreach ($arrLP as $key => $value) {
                    if ($value['id'] == $id) {
                        $id_prerequisite = $value['prerequisite'];
                        break;
                    }
                }
            }
            $arrHide = array ();
            for ($i = 0; $i < count($arrLP); $i++) {
                if ($arrLP[$i]['id'] != $id && $arrLP[$i]['item_type'] != 'dokeos_chapter') {
                    if ($extra_info['previous_item_id'] == $arrLP[$i]['id'])
                        $s_selected_position = $arrLP[$i]['id'];
                    elseif ($action == 'add') $s_selected_position = 0;
                    $arrHide[$arrLP[$i]['id']]['value'] = $arrLP[$i]['title'];

                }
            }

            // Commented the prerequisites, only visible in edit (work).
            /*
                    $return .= '<tr>';
                    $return .= '<td class="label"><label for="idPrerequisites">'.get_lang('LearnpathPrerequisites').'</label></td>';
                    $return .= '<td class="input"><select name="prerequisites" id="prerequisites" class="learnpath_item_form"><option value="0">'.get_lang('NoPrerequisites').'</option>';

                    foreach($arrHide as $key => $value) {
                        if ($key == $s_selected_position && $action == 'add') {
                            $return .= '<option value="'.$key.'" selected="selected">'.$value['value'].'</option>';
                        }
                        elseif ($key == $id_prerequisite && $action == 'edit') {
                            $return .= '<option value="'.$key.'" selected="selected">'.$value['value'].'</option>';
                        }
                        else {
                            $return .= '<option value="'.$key.'">'.$value['value'].'</option>';
                        }
                    }

                    $return .= "</select></td>";
            */
            $return .= '</tr>';
        }

        $return .= '<tr>';
        if ($action == 'add') {
            $return .= '<td>&nbsp</td><td><button class="save" name="submit_button" type="submit">' . get_lang('AddAssignmentToCourse') . '</button></td>';
        } else {
            $return .= '<td>&nbsp</td><td><button class="save" name="submit_button" type="submit">' . get_lang('EditCurrentStudentPublication') . '</button></td>';
        }
        $return .= '</tr>';
        $return .= '</table>';

        if ($action == 'move') {
            $return .= '<input name="title" type="hidden" value="' . $item_title . '" />';
            $return .= '<input name="description" type="hidden" value="' . $item_description . '" />';
        }

        if (is_numeric($extra_info)) {
            $return .= '<input name="path" type="hidden" value="' . $extra_info . '" />';
        } elseif (is_array($extra_info)) {
            $return .= '<input name="path" type="hidden" value="' . $extra_info['path'] . '" />';
        }
        $return .= '<input name="type" type="hidden" value="' . TOOL_STUDENTPUBLICATION . '" />';
        $return .= '<input name="post_time" type="hidden" value="' . time() . '" />';
        $return .= '</form>';
        $return .= '</div>';

        return $return;
    }

    /**
     * Displays the menu for manipulating a step
     *
     * @param $item_id
     * @param string $item_type
     * @return string
     */
    public function display_manipulate($item_id, $item_type = TOOL_DOCUMENT)
    {
        $_course = api_get_course_info();
        $course_id = api_get_course_int_id();
        $course_code = api_get_course_id();

        $return = '<div class="actions">';

        switch ($item_type) {
            case 'dokeos_chapter' :
            case 'chapter' :
                // Commented the message cause should not show it.
                //$lang = get_lang('TitleManipulateChapter');
                break;

            case 'dokeos_module' :
            case 'module' :
                // Commented the message cause should not show it.
                //$lang = get_lang('TitleManipulateModule');
                break;

            case TOOL_DOCUMENT :
                // Commented the message cause should not show it.
                //$lang = get_lang('TitleManipulateDocument');
                break;

            case TOOL_LINK :
            case 'link' :
                // Commented the message cause should not show it.
                //$lang = get_lang('TitleManipulateLink');
                break;

            case TOOL_QUIZ :
                // Commented the message cause should not show it.
                //$lang = get_lang('TitleManipulateQuiz');
                break;

            case TOOL_STUDENTPUBLICATION :
                // Commented the message cause should not show it.
                //$lang = get_lang('TitleManipulateStudentPublication');
                break;
        }

        $tbl_lp_item = Database :: get_course_table(TABLE_LP_ITEM);
        $item_id = intval($item_id);
        $sql = "SELECT * FROM " . $tbl_lp_item . " as lp
                WHERE lp.c_id = ".$course_id." AND lp.id = " . $item_id;
        $result = Database::query($sql);
        $row = Database::fetch_assoc($result);

        $audio_player = null;
        // We display an audio player if needed.
        if (!empty($row['audio'])) {
            $audio_player .= '<div class="lp_mediaplayer" id="container">
                              <a href="http://www.macromedia.com/go/getflashplayer">Get the Flash Player</a> to see this player.
                              </div>';
            $audio_player .= '<script type="text/javascript" src="../inc/lib/mediaplayer/swfobject.js"></script>';
            $audio_player .= '<script>
                                var s1 = new SWFObject("../inc/lib/mediaplayer/player.swf","ply","250","20","9","#FFFFFF");
                                s1.addParam("allowscriptaccess","always");
                                s1.addParam("flashvars","file=../../courses/' . $_course['path'] . '/document/audio/' . $row['audio'] . '&autostart=true");
                                s1.write("container");
                            </script>';
        }

        $url = api_get_self().'?cidReq='.Security::remove_XSS($_GET['cidReq']).'&view=build&id='.$item_id .'&lp_id='.$this->lp_id;

        $return .= Display::url(
            Display::return_icon('edit.png', get_lang('Edit'), array(), ICON_SIZE_SMALL),
            $url.'&action=edit_item&path_item=' . $row['path']
        );

        $return .= Display::url(
            Display::return_icon('move.png', get_lang('Move'), array(), ICON_SIZE_SMALL),
            $url.'&action=move_item'
        );

        // Commented for now as prerequisites cannot be added to chapters.
        if ($item_type != 'dokeos_chapter' && $item_type != 'chapter') {
            $return .= Display::url(
                Display::return_icon('accept.png', get_lang('LearnpathPrerequisites'), array(), ICON_SIZE_SMALL),
                $url.'&action=edit_item_prereq'
            );
        }
        $return .= Display::url(
            Display::return_icon('delete.png', get_lang('Delete'), array(), ICON_SIZE_SMALL),
            $url.'&action=delete_item'
        );

        if ($item_type == TOOL_HOTPOTATOES ) {
            $document_data = DocumentManager::get_document_data_by_id($row['path'], $course_code);
            $return .= get_lang('File').': '.$document_data['absolute_path_from_document'];
        }

        if ($item_type == TOOL_DOCUMENT ) {
            $document_data = DocumentManager::get_document_data_by_id($row['path'], $course_code);
            $return .= get_lang('File').': '.$document_data['absolute_path_from_document'];
        }

        $return .= '</div>';

        if (!empty($audio_player)) {
            $return .= '<br />'.$audio_player;
        }

        return $return;
    }

    /**
     * Creates the javascript needed for filling up the checkboxes without page reload
     * @return string
     */
    public function get_js_dropdown_array()
    {
        $course_id = api_get_course_int_id();
        $return = 'var child_name = new Array();' . "\n";
        $return .= 'var child_value = new Array();' . "\n\n";
        $return .= 'child_name[0] = new Array();' . "\n";
        $return .= 'child_value[0] = new Array();' . "\n\n";
        $tbl_lp_item = Database :: get_course_table(TABLE_LP_ITEM);
        $sql_zero = "SELECT * FROM " . $tbl_lp_item . "
                    WHERE c_id = ".$course_id." AND lp_id = " . $this->lp_id . " AND parent_item_id = 0
                    ORDER BY display_order ASC";
        $res_zero = Database::query($sql_zero);
        $i = 0;

        while ($row_zero = Database :: fetch_array($res_zero)) {
            if ($row_zero['item_type'] == TOOL_QUIZ) {
                $row_zero['title'] = Exercise::get_formated_title_variable($row_zero['title']);
            }
            $js_var = json_encode(get_lang('After').' '.$row_zero['title']);
            $return .= 'child_name[0][' . $i . '] = '.$js_var.' ;' . "\n";
            $return .= 'child_value[0][' . $i++ . '] = "' . $row_zero['id'] . '";' . "\n";
        }
        $return .= "\n";
        $sql = "SELECT * FROM " . $tbl_lp_item . " WHERE c_id = ".$course_id." AND lp_id = " . $this->lp_id;
        $res = Database::query($sql);
        while ($row = Database :: fetch_array($res)) {
            $sql_parent = "SELECT * FROM " . $tbl_lp_item . "
                           WHERE
                                c_id = ".$course_id." AND
                                parent_item_id = " . $row['id'] . "
                           ORDER BY display_order ASC";
            $res_parent = Database::query($sql_parent);
            $i = 0;
            $return .= 'child_name[' . $row['id'] . '] = new Array();' . "\n";
            $return .= 'child_value[' . $row['id'] . '] = new Array();' . "\n\n";

            while ($row_parent = Database :: fetch_array($res_parent)) {
                $js_var = json_encode(get_lang('After').' '.$row_parent['title']);
                $return .= 'child_name[' . $row['id'] . '][' . $i . '] =   '.$js_var.' ;' . "\n";
                $return .= 'child_value[' . $row['id'] . '][' . $i++ . '] = "' . $row_parent['id'] . '";' . "\n";
            }
            $return .= "\n";
        }

        return $return;
    }

    /**
     * Display the form to allow moving an item
     * @param	integer		Item ID
     * @return	string		HTML form
     */
    public function display_move_item($item_id)
    {
        $course_id = api_get_course_int_id();
        $_course = api_get_course_info();
        global $charset;
        $return = '';

        if (is_numeric($item_id)) {
            $tbl_lp_item = Database :: get_course_table(TABLE_LP_ITEM);

            $sql = "SELECT * FROM " . $tbl_lp_item . "
                    WHERE c_id = ".$course_id." AND id = " . $item_id;

            $res = Database::query($sql);
            $row = Database :: fetch_array($res);

            switch ($row['item_type']) {
                case 'dokeos_chapter' :
                case 'dir' :
                case 'asset' :
                    $return .= $this->display_manipulate($item_id, $row['item_type']);
                    $return .= $this->display_item_form($row['item_type'], get_lang('MoveCurrentChapter'), 'move', $item_id, $row);
                    break;
                case 'dokeos_module' :
                    $return .= $this->display_manipulate($item_id, $row['item_type']);
                    $return .= $this->display_item_form($row['item_type'], 'Move th current module:', 'move', $item_id, $row);
                    break;
                case TOOL_DOCUMENT :
                    $return .= $this->display_manipulate($item_id, $row['item_type']);
                    $return .= $this->display_document_form('move', $item_id, $row);
                    break;
                case TOOL_LINK :
                    $return .= $this->display_manipulate($item_id, $row['item_type']);
                    $return .= $this->display_link_form('move', $item_id, $row);
                    break;
                case TOOL_HOTPOTATOES :
                    $return .= $this->display_manipulate($item_id, $row['item_type']);
                    $return .= $this->display_link_form('move', $item_id, $row);
                    break;
                case TOOL_QUIZ :
                    $return .= $this->display_manipulate($item_id, $row['item_type']);
                    $return .= $this->display_quiz_form('move', $item_id, $row);
                    break;
                case TOOL_STUDENTPUBLICATION :
                    $return .= $this->display_manipulate($item_id, $row['item_type']);
                    $return .= $this->display_student_publication_form('move', $item_id, $row);
                    break;
                case TOOL_FORUM :
                    $return .= $this->display_manipulate($item_id, $row['item_type']);
                    $return .= $this->display_forum_form('move', $item_id, $row);
                    break;
                case TOOL_THREAD :
                    $return .= $this->display_manipulate($item_id, $row['item_type']);
                    $return .= $this->display_forum_form('move', $item_id, $row);
                    break;
            }
        }

        return $return;
    }

    /**
     * Displays a basic form on the overview page for changing the item title and the item description.
     * @param string $item_type
     * @param string $title
     * @param array $data
     * @return string
     */
    public function display_item_small_form($item_type, $title = '', $data = array())
    {
        $url = api_get_self() . '?' .api_get_cidreq().'&action=edit_item&lp_id='.$this->lp_id;
        $form = new FormValidator('small_form', 'post', $url);
        $form->addElement('header', $title);
        $form->addElement('text', 'title', get_lang('Title'));
        $form->addButtonSave(get_lang('Save'), 'submit_button');
        $form->addElement('hidden', 'id', $data['id']);
        $form->addElement('hidden', 'parent', $data['parent_item_id']);
        $form->addElement('hidden', 'previous', $data['previous_item_id']);
        $form->setDefaults(array('title' => $data['title']));

        return $form->toHtml();
    }

    /**
     * Return HTML form to allow prerequisites selection
     * @todo use FormValidator
     * @param	integer Item ID
     * @return	string	HTML form
     */
    public function display_item_prerequisites_form($item_id)
    {
        $course_id = api_get_course_int_id();
        $tbl_lp_item = Database :: get_course_table(TABLE_LP_ITEM);
        $item_id = intval($item_id);
        /* Current prerequisite */
        $sql = "SELECT * FROM $tbl_lp_item
                WHERE c_id = $course_id AND id = " . $item_id;
        $result = Database::query($sql);
        $row    = Database::fetch_array($result);
        $prerequisiteId = $row['prerequisite'];
        $return = '<legend>';
        $return .= get_lang('AddEditPrerequisites');
        $return .= '</legend>';
        $return .= '<form method="POST">';
        $return .= '<table class="data_table">';
        $return .= '<tr>';
        $return .= '<th height="24">' . get_lang('LearnpathPrerequisites') . '</th>';
        $return .= '<th width="70" >' . get_lang('Minimum') . '</th>';
        $return .= '<th width="70">' . get_lang('Maximum') . '</th>';
        $return .= '</tr>';

        // Adding the none option to the prerequisites see http://www.chamilo.org/es/node/146
        $return .= '<tr >';
        $return .= '<td colspan="3" class="radio">';
        $return .= '<input checked="checked" id="idNone" name="prerequisites"  style="margin-left:0px; margin-right:10px;" type="radio" />';
        $return .= '<label for="idNone">' . get_lang('None') . '</label>';
        $return .= '</tr>';

        $sql = "SELECT * FROM $tbl_lp_item
                WHERE c_id = $course_id AND lp_id = " . $this->lp_id;
        $result = Database::query($sql);
        $arrLP = array();

        $selectedMinScore = array();
        $selectedMaxScore = array();
        while ($row = Database :: fetch_array($result)) {
            if ($row['id'] == $item_id) {
                $selectedMinScore[$row['prerequisite']] = $row['prerequisite_min_score'];
                $selectedMaxScore[$row['prerequisite']] = $row['prerequisite_max_score'];
            }
            $arrLP[] = array(
                'id' => $row['id'],
                'item_type' => $row['item_type'],
                'title' => $row['title'],
                'ref' => $row['ref'],
                'description' => $row['description'],
                'parent_item_id' => $row['parent_item_id'],
                'previous_item_id' => $row['previous_item_id'],
                'next_item_id' => $row['next_item_id'],
                'max_score' => $row['max_score'],
                'min_score' => $row['min_score'],
                'mastery_score' => $row['mastery_score'],
                'prerequisite' => $row['prerequisite'],
                'next_item_id' => $row['next_item_id'],
                'display_order' => $row['display_order'],
                'prerequisite_min_score' => $row['prerequisite_min_score'],
                'prerequisite_max_score' => $row['prerequisite_max_score'],
            );
        }

        $this->tree_array($arrLP);
        $arrLP = $this->arrMenu;
        unset($this->arrMenu);

        for ($i = 0; $i < count($arrLP); $i++) {
            $item = $arrLP[$i];

            if ($item['id'] == $item_id) {
                break;
            }

            $selectedMaxScoreValue = isset($selectedMaxScore[$item['id']]) ? $selectedMaxScore[$item['id']] : $item['max_score'];
            $selectedMinScoreValue = isset($selectedMinScore[$item['id']]) ? $selectedMinScore[$item['id']]: 0;

            $return .= '<tr>';
            $return .= '<td class="radio"' . (($item['item_type'] != TOOL_QUIZ && $item['item_type'] != TOOL_HOTPOTATOES) ? ' colspan="3"' : '') . '>';
            $return .= '<label for="id' . $item['id'] . '">';
            $return .= '<input' . (in_array($prerequisiteId, array($item['id'], $item['ref'])) ? ' checked="checked" ' : '') . (($item['item_type'] == 'dokeos_module' || $item['item_type'] == 'dokeos_chapter') ? ' disabled="disabled" ' : ' ') . 'id="id' . $item['id'] . '" name="prerequisites" style="margin-left:' . $item['depth'] * 10 . 'px; margin-right:10px;" type="radio" value="' . $item['id'] . '" />';
            $icon_name = str_replace(' ', '', $item['item_type']);

            if (file_exists('../img/lp_' . $icon_name . '.png')) {
                $return .= '<img alt="" src="../img/lp_' . $icon_name . '.png" style="margin-right:5px;" title="" />';
            } else {
                if (file_exists('../img/lp_' . $icon_name . '.gif')) {
                    $return .= '<img alt="" src="../img/lp_' . $icon_name . '.gif" style="margin-right:5px;" title="" />';
                } else {
                    $return .= Display::return_icon('folder_document.gif','',array('style'=>'margin-right:5px;'));
                }
            }
            $return .=  $item['title'] . '</label>';
            $return .= '</td>';

            if ($item['item_type'] == TOOL_QUIZ) {
                // lets update max_score Quiz information depending of the Quiz Advanced properties
                $tmp_obj_lp_item = new LpItem($course_id, $item['id']);
                $tmp_obj_exercice = new Exercise();
                $tmp_obj_exercice->read($tmp_obj_lp_item->path);
                $tmp_obj_lp_item->max_score = $tmp_obj_exercice->get_max_score();

                $tmp_obj_lp_item->update_in_bdd();
                $item['max_score'] = $tmp_obj_lp_item->max_score;

                $return .= '<td class="exercise">';
                $return .= '<input size="4" maxlength="3" name="min_' . $item['id'] . '" type="number" min="0" step="any" max="'.$item['max_score'].'" value="' . $selectedMinScoreValue. '" />';
                $return .= '</td>';
                $return .= '<td class="exercise">';
                $return .= '<input size="4" maxlength="3" name="max_' . $item['id'] . '" type="number" min="0" step="any" max="'.$item['max_score'].'" value="' . $selectedMaxScoreValue . '" />';
                $return .= '</td>';
            }

            if ($item['item_type'] == TOOL_HOTPOTATOES) {
                $return .= '<td class="exercise">';
                $return .= '<center><input size="4" maxlength="3" name="min_' . $item['id'] . '" type="number" min="0" step="any" max="'.$item['max_score'].'" value="' . $selectedMinScoreValue . '" /></center>';
                $return .= '</td>';
                $return .= '<td class="exercise"">';
                $return .= '<center><input size="4" maxlength="3" name="max_' . $item['id'] . '" type="number" min="0" step="any" max="'.$item['max_score'].'"  value="'.$selectedMaxScoreValue . '" /></center>';
                $return .= '</td>';
            }
            $return .= '</tr>';
        }
        $return .= '<tr>';
        $return .= '</tr>';
        $return .= '</table>';
        $return .= '<div style="padding-top:3px;">';
        $return .= '<button class="btn btn-primary" name="submit_button" type="submit">' . get_lang('ModifyPrerequisites') . '</button>';
        $return .= '</form>';

        return $return;
    }

    /**
     * Return HTML list to allow prerequisites selection for lp
     * @param	integer Item ID
     * @return	string	HTML form
     */
    public function display_lp_prerequisites_list()
    {
        $course_id = api_get_course_int_id();
        $lp_id = $this->lp_id;
        $tbl_lp = Database :: get_course_table(TABLE_LP_MAIN);

        // get current prerequisite
        $sql = "SELECT * FROM $tbl_lp WHERE c_id = $course_id AND id = $lp_id ";
        $result = Database::query($sql);
        $row = Database :: fetch_array($result);
        $prerequisiteId = $row['prerequisite'];
        $session_id = api_get_session_id();
        $session_condition = api_get_session_condition($session_id);
        $sql = "SELECT * FROM $tbl_lp
                WHERE c_id = $course_id $session_condition
                ORDER BY display_order ";
        $rs = Database::query($sql);
        $return = '';
        $return .= '<select name="prerequisites" class="form-control">';
        $return .= '<option value="0">'.get_lang('None').'</option>';
        if (Database::num_rows($rs) > 0) {
            while ($row = Database::fetch_array($rs)) {
                if ($row['id'] == $lp_id) {
                    continue;
                }
                $return .= '<option value="'.$row['id'].'" '.(($row['id']==$prerequisiteId)?' selected ' : '').'>'.$row['name'].'</option>';
            }
        }
        $return .= '</select>';

        return $return;
    }

    /**
     * Creates a list with all the documents in it
     * @param bool $showInvisibleFiles
     * @return string
     */
    public function get_documents($showInvisibleFiles = false)
    {
        $course_info = api_get_course_info();
        $sessionId = api_get_session_id();

        $document_tree = DocumentManager::get_document_preview(
            $course_info,
            $this->lp_id,
            null,
            $sessionId,
            true,
            null,
            null,
            $showInvisibleFiles,
            true
        );

        return $document_tree;
    }

    /**
     * Creates a list with all the exercises (quiz) in it
     * @return string
     */
    public function get_exercises()
    {
        $course_id = api_get_course_int_id();

        // New for hotpotatoes.
        $uploadPath = DIR_HOTPOTATOES; //defined in main_api
        $tbl_doc = Database :: get_course_table(TABLE_DOCUMENT);
        $tbl_quiz = Database :: get_course_table(TABLE_QUIZ_TEST);

        $session_id = api_get_session_id();
        $condition_session = api_get_session_condition($session_id);

        $sql_quiz = "SELECT * FROM $tbl_quiz
                     WHERE c_id = $course_id AND active<>'-1' $condition_session
                     ORDER BY title ASC";

        $sql_hot  = "SELECT * FROM $tbl_doc
                     WHERE c_id = $course_id AND path LIKE '" . $uploadPath . "/%/%htm%'  $condition_session
                     ORDER BY id ASC";

        $res_quiz = Database::query($sql_quiz);
        $res_hot  = Database::query($sql_hot);

        $return = '<ul class="lp_resource">';

        $return .= '<li class="lp_resource_element">';
        $return .= '<img alt="" src="../img/new_test_small.gif" style="margin-right:5px;" title="" />';
        $return .= '<a href="' . api_get_path(REL_CODE_PATH) . 'exercice/exercise_admin.php?'.api_get_cidreq().'&lp_id=' . $this->lp_id . '">' .
                    get_lang('NewExercise') . '</a>';
        $return .= '</li>';

        // Display hotpotatoes
        while ($row_hot = Database :: fetch_array($res_hot)) {
            $return .= '<li class="lp_resource_element" data_id="'.$row_hot['id'].'" data_type="hotpotatoes" title="'.$row_hot['title'].'" >';

            $return .= '<a class="moved" href="#">';
            $return .= Display::return_icon('move_everywhere.png', get_lang('Move'), array(), ICON_SIZE_TINY);
            $return .= '</a> ';

            $return .= '<img src="../img/hotpotatoes_s.png" style="margin-right:5px;" title="" width="16px" />';
            $return .= '<a href="' . api_get_self() . '?' . api_get_cidreq().'&action=add_item&type=' . TOOL_HOTPOTATOES . '&file=' . $row_hot['id'] . '&lp_id=' . $this->lp_id . '">'.
                ((!empty ($row_hot['comment'])) ? $row_hot['comment'] : Security :: remove_XSS($row_hot['title'])) . '</a>';
            $return .= '</li>';
        }

        while ($row_quiz = Database :: fetch_array($res_quiz)) {
            $return .= '<li class="lp_resource_element" data_id="'.$row_quiz['id'].'" data_type="quiz" title="'.$row_quiz['title'].'" >';
            $return .= '<a class="moved" href="#">';
            $return .= Display::return_icon('move_everywhere.png', get_lang('Move'), array(), ICON_SIZE_TINY);
            $return .= '</a> ';
            $return .= '<img alt="" src="../img/quizz_small.gif" style="margin-right:5px;" title="" />';
            $return .= '<a href="' . api_get_self() . '?'.api_get_cidreq().'&action=add_item&type=' . TOOL_QUIZ . '&file=' . $row_quiz['id'] . '&lp_id=' . $this->lp_id . '">' .
                Security :: remove_XSS(cut($row_quiz['title'], 80)).
                '</a>';
            $return .= '</li>';
        }

        $return .= '</ul>';
        return $return;
    }

    /**
     * Creates a list with all the links in it
     * @return string
     */
    public function get_links()
    {
        $selfUrl = api_get_self();
        $courseIdReq = api_get_cidreq();
        $course = api_get_course_info();
        $course_id = $course['real_id'];
        $tbl_link = Database::get_course_table(TABLE_LINK);
        $linkCategoryTable = Database::get_course_table(TABLE_LINK_CATEGORY);
        $moveEverywhereIcon = Display::return_icon('move_everywhere.png', get_lang('Move'), array(), ICON_SIZE_TINY);

        $session_id = api_get_session_id();
        $condition_session = api_get_session_condition($session_id, true, null, "link.session_id");

        $sql = "SELECT link.id as link_id,
                    link.title as link_title,
                    link.category_id as category_id,
                    link_category.category_title as category_title
                FROM $tbl_link as link
                LEFT JOIN $linkCategoryTable as link_category
                ON link.category_id = link_category.id
                WHERE link.c_id = ".$course_id." $condition_session
                ORDER BY link_category.category_title ASC, link.title ASC";
        $links = Database::query($sql);

        $categorizedLinks = array();
        $categories = array();

        while ($link = Database :: fetch_array($links)) {
            if (!$link['category_id']) {
                $link['category_title'] = get_lang('Uncategorized');
            }
            $categories[$link['category_id']] = $link['category_title'];
            $categorizedLinks[$link['category_id']][$link['link_id']] = $link['link_title'];
        }

        $linksHtmlCode =
        '<script>
            function toggle_tool(tool, id){
                if(document.getElementById(tool+"_"+id+"_content").style.display == "none"){
                    document.getElementById(tool+"_"+id+"_content").style.display = "block";
                    document.getElementById(tool+"_"+id+"_opener").src = "' . api_get_path(WEB_IMG_PATH) . 'remove.gif";
                } else {
                    document.getElementById(tool+"_"+id+"_content").style.display = "none";
                    document.getElementById(tool+"_"+id+"_opener").src = "' . api_get_path(WEB_IMG_PATH) . 'add.gif";
                }
            }
        </script>
        <ul class="lp_resource">
            <li class="lp_resource_element">
                <img alt="" src="../img/linksnew.gif" style="margin-right:5px;width:16px"/>
                <a href="'.api_get_path(REL_CODE_PATH).'link/link.php?'.$courseIdReq.
                    '&action=addlink&lp_id='.$this->lp_id.'" title="'.get_lang('LinkAdd').'">'.get_lang('LinkAdd').'</a>
            </li>';
        foreach ($categorizedLinks as $categoryId => $links) {
            $linkNodes = null;
            foreach ($links as $key => $title) {
                if (api_get_item_visibility($course, TOOL_LINK, $key, $session_id) != 2)  {
                    $linkNodes .=
                    '<li class="lp_resource_element" data_id="'.$key.
                        '" data_type="'.TOOL_LINK.'" title="'.$title.'" >
                        <a class="moved" href="#">'.
                            $moveEverywhereIcon.
                        '</a>
                        <img alt="" src="../img/lp_link.gif" style="margin-right:5px;width:16px"/>
                        <a href="'.$selfUrl.'?'.$courseIdReq.'&action=add_item&type='.
                            TOOL_LINK.'&file='.$key.'&lp_id='.$this->lp_id.'">'.
                            Security::remove_XSS($title).
                        '</a>
                    </li>';
                }
            }
            $linksHtmlCode .=
            '<li>
                <a style="cursor:hand" onclick="javascript: toggle_tool(\''.TOOL_LINK.'\','.$categoryId.')"
                style="vertical-align:middle">
                    <img src="'.api_get_path(WEB_IMG_PATH).'add.gif" id="'.TOOL_LINK.'_'.$categoryId.'_opener"
                    align="absbottom" />
                </a>
                <span style="vertical-align:middle">'.Security::remove_XSS($categories[$categoryId]).'</span>
            </li>
            <div style="display:none" id="'.TOOL_LINK.'_'.$categoryId.'_content">'.$linkNodes.'</div>';
        }
        $linksHtmlCode .= '</ul>';

        return $linksHtmlCode;
    }

    /**
     * Creates a list with all the student publications in it
     * @return unknown
     */
    public function get_student_publications()
    {
        $return = '<div class="lp_resource" >';
        $return .= '<div class="lp_resource_element">';
        $return .= '<img align="left" alt="" src="../img/works_small.gif" style="margin-right:5px;" title="" />';
        $return .= '<a href="' . api_get_self() . '?' . api_get_cidreq() . '&action=add_item&type=' . TOOL_STUDENTPUBLICATION . '&lp_id=' . $this->lp_id . '">' . get_lang('AddAssignmentPage') . '</a>';
        $return .= '</div>';
        $return .= '</div>';
        return $return;
    }

    /**
     * Creates a list with all the forums in it
     * @return string
     */
    public function get_forums()
    {
        require_once '../forum/forumfunction.inc.php';
        require_once '../forum/forumconfig.inc.php';

        $a_forums = get_forums();

        $return = '<ul class="lp_resource">';

        //First add link
        $return .= '<li class="lp_resource_element">';
        $return .= '<img alt="" src="../img/forum_new_small.gif" style="margin-right:5px;" title="" />';
        $return .= '<a href="' . api_get_path(REL_CODE_PATH) . 'forum/index.php?' . api_get_cidreq() . '&action=add&content=forum&origin=learnpath&lp_id=' . $this->lp_id . '" title="' . get_lang('CreateANewForum') . '">' . get_lang('CreateANewForum') . '</a>';
        $return .= '</li>';

        $return .= '<script>
                    function toggle_forum(forum_id){
                        if(document.getElementById("forum_"+forum_id+"_content").style.display == "none"){
                            document.getElementById("forum_"+forum_id+"_content").style.display = "block";
                            document.getElementById("forum_"+forum_id+"_opener").src = "' . api_get_path(WEB_IMG_PATH) . 'remove.gif";
                        } else {
                            document.getElementById("forum_"+forum_id+"_content").style.display = "none";
                            document.getElementById("forum_"+forum_id+"_opener").src = "' . api_get_path(WEB_IMG_PATH) . 'add.gif";
                        }
                    }
                </script>';

        foreach ($a_forums as $forum) {
            if (!empty($forum['forum_id'])) {
                $return .= '<li class="lp_resource_element" data_id="'.$forum['forum_id'].'" data_type="'.TOOL_FORUM.'" title="'.$forum['forum_title'].'" >';
                $return .= '<a class="moved" href="#">';
                $return .= Display::return_icon('move_everywhere.png', get_lang('Move'), array(), ICON_SIZE_TINY);
                $return .= ' </a>';
                $return .= '<img alt="" src="../img/lp_forum.gif" style="margin-right:5px;" title="" />';
                $return .= '<a style="cursor:hand" onclick="javascript: toggle_forum(' . $forum['forum_id'] . ')" style="vertical-align:middle">
                                <img src="' . api_get_path(WEB_IMG_PATH) . 'add.gif" id="forum_' . $forum['forum_id'] . '_opener" align="absbottom" />
                            </a>
                            <a href="' . api_get_self() . '?'.api_get_cidreq().'&action=add_item&type=' . TOOL_FORUM . '&forum_id=' . $forum['forum_id'] . '&lp_id=' . $this->lp_id . '" style="vertical-align:middle">' .
                    Security :: remove_XSS($forum['forum_title']) . '</a>';

                $return .= '</li>';

                $return .= '<div style="display:none" id="forum_' . $forum['forum_id'] . '_content">';
                $a_threads = get_threads($forum['forum_id']);
                if (is_array($a_threads)) {
                    foreach ($a_threads as $thread) {
                        $return .= '<li class="lp_resource_element" data_id="'.$thread['thread_id'].'" data_type="'.TOOL_THREAD.'" title="'.$thread['thread_title'].'" >';
                        $return .= '&nbsp;<a class="moved" href="#">';
                        $return .= Display::return_icon('move_everywhere.png', get_lang('Move'), array(), ICON_SIZE_TINY);
                        $return .= ' </a>';
                        $return .= Display::return_icon('forumthread.png', get_lang('Thread'), array(), ICON_SIZE_TINY);
                        $return .= '<a href="'.api_get_self().'?'.api_get_cidreq().'&action=add_item&type=' . TOOL_THREAD . '&thread_id=' . $thread['thread_id'] . '&lp_id=' . $this->lp_id . '">' .
                            Security :: remove_XSS($thread['thread_title']) . '</a>';
                        $return .= '</li>';
                    }
                }
                $return .= '</div>';
            }
        }
        $return .= '</ul>';

        return $return;
    }

    /**
     * // TODO: The output encoding should be equal to the system encoding.
     *
     * Exports the learning path as a SCORM package. This is the main function that
     * gathers the content, transforms it, writes the imsmanifest.xml file, zips the
     * whole thing and returns the zip.
     *
     * This method needs to be called in PHP5, as it will fail with non-adequate
     * XML package (like the ones for PHP4), and it is *not* a static method, so
     * you need to call it on a learnpath object.
     * @TODO The method might be redefined later on in the scorm class itself to avoid
     * creating a SCORM structure if there is one already. However, if the initial SCORM
     * path has been modified, it should use the generic method here below.
     * @TODO link this function with the export_lp() function in the same class
     * @param	string	Optional name of zip file. If none, title of learnpath is
     * 					domesticated and trailed with ".zip"
     * @return	string	Returns the zip package string, or null if error
     */
    public function scorm_export()
    {
        $_course = api_get_course_info();
        $course_id = $_course['real_id'];

        // Remove memory and time limits as much as possible as this might be a long process...
        if (function_exists('ini_set')) {
            api_set_memory_limit('128M');
            ini_set('max_execution_time', 600);
        }

        // Create the zip handler (this will remain available throughout the method).
        $archive_path = api_get_path(SYS_ARCHIVE_PATH);
        $sys_course_path = api_get_path(SYS_COURSE_PATH);
        $temp_dir_short = uniqid();
        $temp_zip_dir = $archive_path.'/'.$temp_dir_short;
        $temp_zip_file = $temp_zip_dir.'/'.md5(time()).'.zip';
        $zip_folder = new PclZip($temp_zip_file);
        $current_course_path = api_get_path(SYS_COURSE_PATH).api_get_course_path();
        $root_path = $main_path = api_get_path(SYS_PATH);
        $files_cleanup = array();

        // Place to temporarily stash the zip file.
        // create the temp dir if it doesn't exist
        // or do a cleanup before creating the zip file.
        if (!is_dir($temp_zip_dir)) {
            mkdir($temp_zip_dir, api_get_permissions_for_new_directories());
        } else {
            // Cleanup: Check the temp dir for old files and delete them.
            $handle = opendir($temp_zip_dir);
            while (false !== ($file = readdir($handle))) {
                if ($file != '.' && $file != '..') {
                    unlink("$temp_zip_dir/$file");
                }
            }
            closedir($handle);
        }
        $zip_files = $zip_files_abs = $zip_files_dist = array();
        if (is_dir($current_course_path.'/scorm/'.$this->path) && is_file($current_course_path.'/scorm/'.$this->path.'/imsmanifest.xml')) {
            // Remove the possible . at the end of the path.
            $dest_path_to_lp = substr($this->path, -1) == '.' ? substr($this->path, 0, -1) : $this->path;
            $dest_path_to_scorm_folder = str_replace('//','/',$temp_zip_dir.'/scorm/'.$dest_path_to_lp);
            mkdir($dest_path_to_scorm_folder, api_get_permissions_for_new_directories(), true);
            $zip_files_dist = copyr($current_course_path.'/scorm/'.$this->path, $dest_path_to_scorm_folder, array('imsmanifest'), $zip_files);
        }

        // Build a dummy imsmanifest structure.
        // Do not add to the zip yet (we still need it).
        // This structure is developed following regulations for SCORM 1.2 packaging in the SCORM 1.2 Content
        // Aggregation Model official document, section "2.3 Content Packaging".
        // We are going to build a UTF-8 encoded manifest. Later we will recode it to the desired (and supported) encoding.
        $xmldoc = new DOMDocument('1.0');
        $root = $xmldoc->createElement('manifest');
        $root->setAttribute('identifier', 'SingleCourseManifest');
        $root->setAttribute('version', '1.1');
        $root->setAttribute('xmlns', 'http://www.imsproject.org/xsd/imscp_rootv1p1p2');
        $root->setAttribute('xmlns:adlcp', 'http://www.adlnet.org/xsd/adlcp_rootv1p2');
        $root->setAttribute('xmlns:xsi', 'http://www.w3.org/2001/XMLSchema-instance');
        $root->setAttribute('xsi:schemaLocation', 'http://www.imsproject.org/xsd/imscp_rootv1p1p2 imscp_rootv1p1p2.xsd http://www.imsglobal.org/xsd/imsmd_rootv1p2p1 imsmd_rootv1p2p1.xsd http://www.adlnet.org/xsd/adlcp_rootv1p2 adlcp_rootv1p2.xsd');
        // Build mandatory sub-root container elements.
        $metadata = $xmldoc->createElement('metadata');
        $md_schema = $xmldoc->createElement('schema', 'ADL SCORM');
        $metadata->appendChild($md_schema);
        $md_schemaversion = $xmldoc->createElement('schemaversion', '1.2');
        $metadata->appendChild($md_schemaversion);
        $root->appendChild($metadata);

        $organizations = $xmldoc->createElement('organizations');
        $resources = $xmldoc->createElement('resources');

        // Build the only organization we will use in building our learnpaths.
        $organizations->setAttribute('default', 'chamilo_scorm_export');
        $organization = $xmldoc->createElement('organization');
        $organization->setAttribute('identifier', 'chamilo_scorm_export');
        // To set the title of the SCORM entity (=organization), we take the name given
        // in Chamilo and convert it to HTML entities using the Chamilo charset (not the
        // learning path charset) as it is the encoding that defines how it is stored
        // in the database. Then we convert it to HTML entities again as the "&" character
        // alone is not authorized in XML (must be &amp;).
        // The title is then decoded twice when extracting (see scorm::parse_manifest).
        $org_title = $xmldoc->createElement('title', api_utf8_encode($this->get_name()));
        $organization->appendChild($org_title);

        $folder_name = 'document';

        // Removes the learning_path/scorm_folder path when exporting see #4841
        $path_to_remove = null;
        $result = $this->generate_lp_folder($_course);

        if (isset($result['dir']) && strpos($result['dir'], 'learning_path')) {
            $path_to_remove = 'document'.$result['dir'];
            $path_to_replace = $folder_name.'/';
        }

        //Fixes chamilo scorm exports
        if ($this->ref == 'chamilo_scorm_export') {
            $path_to_remove = 'scorm/'.$this->path.'/document/';
        }

        // For each element, add it to the imsmanifest structure, then add it to the zip.
        // Always call the learnpathItem->scorm_export() method to change it to the SCORM format.
        $link_updates = array();
        $links_to_create = array();
        foreach ($this->items as $index => $item) {
            if (!in_array($item->type, array(TOOL_QUIZ, TOOL_FORUM, TOOL_THREAD, TOOL_LINK, TOOL_STUDENTPUBLICATION))) {
                // Get included documents from this item.
                if ($item->type == 'sco') {
                    $inc_docs = $item->get_resources_from_source(
                        null,
                        api_get_path(SYS_COURSE_PATH) . api_get_course_path() . '/' . 'scorm/' . $this->path . '/' . $item->get_path()
                    );
                } else {
                    $inc_docs = $item->get_resources_from_source();
                }
                // Give a child element <item> to the <organization> element.
                $my_item_id = $item->get_id();
                $my_item = $xmldoc->createElement('item');
                $my_item->setAttribute('identifier', 'ITEM_'.$my_item_id);
                $my_item->setAttribute('identifierref', 'RESOURCE_'.$my_item_id);
                $my_item->setAttribute('isvisible', 'true');
                // Give a child element <title> to the <item> element.
                $my_title = $xmldoc->createElement('title', htmlspecialchars(api_utf8_encode($item->get_title()), ENT_QUOTES, 'UTF-8'));
                $my_item->appendChild($my_title);
                // Give a child element <adlcp:prerequisites> to the <item> element.
                $my_prereqs = $xmldoc->createElement('adlcp:prerequisites', $this->get_scorm_prereq_string($my_item_id));
                $my_prereqs->setAttribute('type', 'aicc_script');
                $my_item->appendChild($my_prereqs);
                // Give a child element <adlcp:maxtimeallowed> to the <item> element - not yet supported.
                //$xmldoc->createElement('adlcp:maxtimeallowed','');
                // Give a child element <adlcp:timelimitaction> to the <item> element - not yet supported.
                //$xmldoc->createElement('adlcp:timelimitaction','');
                // Give a child element <adlcp:datafromlms> to the <item> element - not yet supported.
                //$xmldoc->createElement('adlcp:datafromlms','');
                // Give a child element <adlcp:masteryscore> to the <item> element.
                $my_masteryscore = $xmldoc->createElement('adlcp:masteryscore', $item->get_mastery_score());
                $my_item->appendChild($my_masteryscore);

                // Attach this item to the organization element or hits parent if there is one.
                if (!empty($item->parent) && $item->parent != 0) {
                    $children = $organization->childNodes;
                    $possible_parent = &$this->get_scorm_xml_node($children, 'ITEM_'.$item->parent);
                    if (is_object($possible_parent)) {
                        $possible_parent->appendChild($my_item);
                    } else {
                        if ($this->debug > 0) { error_log('Parent ITEM_'.$item->parent.' of item ITEM_'.$my_item_id.' not found'); }
                    }
                } else {
                    if ($this->debug > 0) { error_log('No parent'); }
                    $organization->appendChild($my_item);
                }

                // Get the path of the file(s) from the course directory root.
                $my_file_path = $item->get_file_path('scorm/'.$this->path.'/');

                if (!empty($path_to_remove)) {
                    //From docs
                    $my_xml_file_path = str_replace($path_to_remove, $path_to_replace, $my_file_path);

                    //From quiz
                    if ($this->ref == 'chamilo_scorm_export') {
                        $path_to_remove = 'scorm/'.$this->path.'/';
                        $my_xml_file_path = str_replace($path_to_remove, '', $my_file_path);
                    }
                } else {
                    $my_xml_file_path = $my_file_path;
                }

                $my_sub_dir = dirname($my_file_path);
                $my_sub_dir = str_replace('\\', '/', $my_sub_dir);
                $my_xml_sub_dir = $my_sub_dir;
                // Give a <resource> child to the <resources> element
                $my_resource = $xmldoc->createElement('resource');
                $my_resource->setAttribute('identifier', 'RESOURCE_'.$item->get_id());
                $my_resource->setAttribute('type', 'webcontent');
                $my_resource->setAttribute('href', $my_xml_file_path);
                // adlcp:scormtype can be either 'sco' or 'asset'.
                if ($item->type == 'sco') {
                    $my_resource->setAttribute('adlcp:scormtype', 'sco');
                } else {
                    $my_resource->setAttribute('adlcp:scormtype', 'asset');
                }
                // xml:base is the base directory to find the files declared in this resource.
                $my_resource->setAttribute('xml:base', '');
                // Give a <file> child to the <resource> element.
                $my_file = $xmldoc->createElement('file');
                $my_file->setAttribute('href', $my_xml_file_path);
                $my_resource->appendChild($my_file);

                // Dependency to other files - not yet supported.
                $i = 1;
                foreach ($inc_docs as $doc_info) {
                    if (count($doc_info) < 1 || empty($doc_info[0])) { continue; }
                    $my_dep = $xmldoc->createElement('resource');
                    $res_id = 'RESOURCE_'.$item->get_id().'_'.$i;
                    $my_dep->setAttribute('identifier', $res_id);
                    $my_dep->setAttribute('type', 'webcontent');
                    $my_dep->setAttribute('adlcp:scormtype', 'asset');
                    $my_dep_file = $xmldoc->createElement('file');
                    // Check type of URL.
                    //error_log(__LINE__.'Now dealing with '.$doc_info[0].' of type '.$doc_info[1].'-'.$doc_info[2], 0);
                    if ($doc_info[1] == 'remote') {
                        // Remote file. Save url as is.
                        $my_dep_file->setAttribute('href', $doc_info[0]);
                        $my_dep->setAttribute('xml:base', '');
                    } elseif ($doc_info[1] == 'local') {
                        switch ($doc_info[2]) {
                            case 'url': // Local URL - save path as url for now, don't zip file.
                                $abs_path = api_get_path(SYS_PATH).str_replace(api_get_path(WEB_PATH), '', $doc_info[0]);
                                $current_dir = dirname($abs_path);
                                $current_dir = str_replace('\\', '/', $current_dir);
                                $file_path = realpath($abs_path);
                                $file_path = str_replace('\\', '/', $file_path);
                                $my_dep_file->setAttribute('href', $file_path);
                                $my_dep->setAttribute('xml:base', '');
                                if (strstr($file_path, $main_path) !== false) {
                                    // The calculated real path is really inside Chamilo's root path.
                                    // Reduce file path to what's under the DocumentRoot.
                                    $file_path = substr($file_path, strlen($root_path) - 1);
                                    //echo $file_path;echo '<br /><br />';
                                    //error_log(__LINE__.'Reduced url path: '.$file_path, 0);
                                    $zip_files_abs[] = $file_path;
                                    $link_updates[$my_file_path][] = array('orig' => $doc_info[0], 'dest' => $file_path);
                                    $my_dep_file->setAttribute('href', $file_path);
                                    $my_dep->setAttribute('xml:base', '');
                                } elseif (empty($file_path)) {
                                    /*$document_root = substr(api_get_path(SYS_PATH), 0, strpos(api_get_path(SYS_PATH), api_get_path(REL_PATH)));
                                    if (strpos($document_root, -1) == '/') {
                                        $document_root = substr(0, -1, $document_root);
                                    }*/
                                    $file_path = $_SERVER['DOCUMENT_ROOT'].$abs_path;
                                    $file_path = str_replace('//', '/', $file_path);
                                    if (file_exists($file_path)) {
                                        $file_path = substr($file_path, strlen($current_dir)); // We get the relative path.
                                        $zip_files[] = $my_sub_dir.'/'.$file_path;
                                        $link_updates[$my_file_path][] = array('orig' => $doc_info[0], 'dest' => $file_path);
                                        $my_dep_file->setAttribute('href', $file_path);
                                        $my_dep->setAttribute('xml:base', '');
                                    }
                                }
                                break;
                            case 'abs': // Absolute path from DocumentRoot. Save file and leave path as is in the zip.
                                $my_dep_file->setAttribute('href', $doc_info[0]);
                                $my_dep->setAttribute('xml:base', '');

                                // The next lines fix a bug when using the "subdir" mode of Chamilo, whereas
                                // an image path would be constructed as /var/www/subdir/subdir/img/foo.bar
                                $abs_img_path_without_subdir = $doc_info[0];
                                $relp = api_get_path(REL_PATH); // The url-append config param.
                                $pos = strpos($abs_img_path_without_subdir, $relp);
                                if ($pos === 0) {
                                    $abs_img_path_without_subdir = '/'.substr($abs_img_path_without_subdir, strlen($relp));
                                }
                                $file_path = realpath(api_get_path(SYS_PATH).$abs_img_path_without_subdir);
                                $file_path = str_replace('\\', '/', $file_path);
                                $file_path = str_replace('//', '/', $file_path);

                                // Prepare the current directory path (until just under 'document') with a trailing slash.
                                $cur_path = substr($current_course_path, -1) == '/' ? $current_course_path : $current_course_path.'/';
                                // Check if the current document is in that path.
                                if (strstr($file_path, $cur_path) !== false) {
                                    // The document is in that path, now get the relative path
                                    // to the containing document.
                                    $orig_file_path = dirname($cur_path.$my_file_path).'/';
                                    $orig_file_path = str_replace('\\', '/', $orig_file_path);
                                    $relative_path = '';
                                    if (strstr($file_path, $cur_path) !== false) {
                                        //$relative_path = substr($file_path, strlen($orig_file_path));
                                        $relative_path = str_replace($cur_path, '', $file_path);
                                        $file_path = substr($file_path, strlen($cur_path));
                                    } else {
                                        // This case is still a problem as it's difficult to calculate a relative path easily
                                        // might still generate wrong links.
                                        //$file_path = substr($file_path,strlen($cur_path));
                                        // Calculate the directory path to the current file (without trailing slash).
                                        $my_relative_path = dirname($file_path);
                                        $my_relative_path = str_replace('\\', '/', $my_relative_path);
                                        $my_relative_file = basename($file_path);
                                        // Calculate the directory path to the containing file (without trailing slash).
                                        $my_orig_file_path = substr($orig_file_path, 0, -1);
                                        $dotdot = '';
                                        $subdir = '';
                                        while (strstr($my_relative_path, $my_orig_file_path) === false && (strlen($my_orig_file_path) > 1) && (strlen($my_relative_path) > 1)) {
                                            $my_relative_path2 = dirname($my_relative_path);
                                            $my_relative_path2 = str_replace('\\', '/', $my_relative_path2);
                                            $my_orig_file_path = dirname($my_orig_file_path);
                                            $my_orig_file_path = str_replace('\\', '/', $my_orig_file_path);
                                            $subdir = substr($my_relative_path, strlen($my_relative_path2) + 1).'/'.$subdir;
                                            $dotdot += '../';
                                            $my_relative_path = $my_relative_path2;
                                        }
                                        $relative_path = $dotdot.$subdir.$my_relative_file;
                                    }
                                    // Put the current document in the zip (this array is the array
                                    // that will manage documents already in the course folder - relative).
                                    $zip_files[] = $file_path;
                                    // Update the links to the current document in the containing document (make them relative).
                                    $link_updates[$my_file_path][] = array('orig' => $doc_info[0], 'dest' => $relative_path);
                                    $my_dep_file->setAttribute('href', $file_path);
                                    $my_dep->setAttribute('xml:base', '');
                                } elseif (strstr($file_path, $main_path) !== false) {
                                    // The calculated real path is really inside Chamilo's root path.
                                    // Reduce file path to what's under the DocumentRoot.
                                    $file_path = substr($file_path, strlen($root_path));
                                    //echo $file_path;echo '<br /><br />';
                                    //error_log('Reduced path: '.$file_path, 0);
                                    $zip_files_abs[] = $file_path;
                                    $link_updates[$my_file_path][] = array('orig' => $doc_info[0], 'dest' => $file_path);
                                    $my_dep_file->setAttribute('href', 'document/'.$file_path);
                                    $my_dep->setAttribute('xml:base', '');
                                } elseif (empty($file_path)) {
                                    /*$document_root = substr(api_get_path(SYS_PATH), 0, strpos(api_get_path(SYS_PATH), api_get_path(REL_PATH)));
                                    if(strpos($document_root,-1) == '/') {
                                        $document_root = substr(0, -1, $document_root);
                                    }*/
                                    $file_path = $_SERVER['DOCUMENT_ROOT'].$doc_info[0];
                                    $file_path = str_replace('//', '/', $file_path);

                                    $abs_path = api_get_path(SYS_PATH).str_replace(api_get_path(WEB_PATH), '', $doc_info[0]);
                                    $current_dir = dirname($abs_path);
                                    $current_dir = str_replace('\\', '/', $current_dir);

                                    if (file_exists($file_path)) {
                                        $file_path = substr($file_path, strlen($current_dir)); // We get the relative path.
                                        $zip_files[] = $my_sub_dir.'/'.$file_path;
                                        $link_updates[$my_file_path][] = array('orig' => $doc_info[0], 'dest' => $file_path);
                                        $my_dep_file->setAttribute('href','document/'.$file_path);
                                        $my_dep->setAttribute('xml:base', '');
                                    }
                                }
                                break;
                            case 'rel':
                                // Path relative to the current document.
                                // Save xml:base as current document's directory and save file in zip as subdir.file_path
                                if (substr($doc_info[0], 0, 2) == '..') {
                                    // Relative path going up.
                                    $current_dir = dirname($current_course_path.'/'.$item->get_file_path()).'/';
                                    $current_dir = str_replace('\\', '/', $current_dir);
                                    $file_path = realpath($current_dir.$doc_info[0]);
                                    $file_path = str_replace('\\', '/', $file_path);

                                    //error_log($file_path.' <-> '.$main_path,0);
                                    if (strstr($file_path, $main_path) !== false) {
                                        // The calculated real path is really inside Chamilo's root path.
                                        // Reduce file path to what's under the DocumentRoot.
                                        $file_path = substr($file_path, strlen($root_path));
                                        //error_log('Reduced path: '.$file_path, 0);
                                        $zip_files_abs[] = $file_path;
                                        $link_updates[$my_file_path][] = array('orig' => $doc_info[0], 'dest' => $file_path);
                                        $my_dep_file->setAttribute('href', 'document/'.$file_path);
                                        $my_dep->setAttribute('xml:base', '');
                                    }
                                } else {
                                    $zip_files[] = $my_sub_dir.'/'.$doc_info[0];
                                    $my_dep_file->setAttribute('href', $doc_info[0]);
                                    $my_dep->setAttribute('xml:base', $my_xml_sub_dir);
                                }
                                break;
                            default:
                                $my_dep_file->setAttribute('href', $doc_info[0]);
                                $my_dep->setAttribute('xml:base', '');
                                break;
                        }
                    }
                    $my_dep->appendChild($my_dep_file);
                    $resources->appendChild($my_dep);
                    $dependency = $xmldoc->createElement('dependency');
                    $dependency->setAttribute('identifierref', $res_id);
                    $my_resource->appendChild($dependency);
                    $i++;
                }
                $resources->appendChild($my_resource);
                $zip_files[] = $my_file_path;
            } else {

                // If the item is a quiz or a link or whatever non-exportable, we include a step indicating it.
                switch ($item->type) {
                    case TOOL_LINK:
                        $my_item = $xmldoc->createElement('item');
                        $my_item->setAttribute('identifier', 'ITEM_'.$item->get_id());
                        $my_item->setAttribute('identifierref', 'RESOURCE_'.$item->get_id());
                        $my_item->setAttribute('isvisible', 'true');
                        // Give a child element <title> to the <item> element.
                        $my_title = $xmldoc->createElement('title', htmlspecialchars(api_utf8_encode($item->get_title()), ENT_QUOTES, 'UTF-8'));
                        $my_item->appendChild($my_title);
                        // Give a child element <adlcp:prerequisites> to the <item> element.
                        $my_prereqs = $xmldoc->createElement('adlcp:prerequisites', $item->get_prereq_string());
                        $my_prereqs->setAttribute('type', 'aicc_script');
                        $my_item->appendChild($my_prereqs);
                        // Give a child element <adlcp:maxtimeallowed> to the <item> element - not yet supported.
                        //$xmldoc->createElement('adlcp:maxtimeallowed', '');
                        // Give a child element <adlcp:timelimitaction> to the <item> element - not yet supported.
                        //$xmldoc->createElement('adlcp:timelimitaction', '');
                        // Give a child element <adlcp:datafromlms> to the <item> element - not yet supported.
                        //$xmldoc->createElement('adlcp:datafromlms', '');
                        // Give a child element <adlcp:masteryscore> to the <item> element.
                        $my_masteryscore = $xmldoc->createElement('adlcp:masteryscore', $item->get_mastery_score());
                        $my_item->appendChild($my_masteryscore);

                        // Attach this item to the organization element or its parent if there is one.
                        if (!empty($item->parent) && $item->parent != 0) {
                            $children = $organization->childNodes;
                            for ($i = 0; $i < $children->length; $i++) {
                                $item_temp = $children->item($i);
                                if ($item_temp -> nodeName == 'item') {
                                    if ($item_temp->getAttribute('identifier') == 'ITEM_'.$item->parent) {
                                        $item_temp -> appendChild($my_item);
                                    }
                                }
                            }
                        } else {
                            $organization->appendChild($my_item);
                        }

                        $my_file_path = 'link_'.$item->get_id().'.html';
                        $sql = 'SELECT url, title FROM '.Database :: get_course_table(TABLE_LINK).'
                                WHERE c_id = '.$course_id.' AND id='.$item->path;
                        $rs = Database::query($sql);
                        if ($link = Database :: fetch_array($rs)) {
                            $url = $link['url'];
                            $title = stripslashes($link['title']);
                            $links_to_create[$my_file_path] = array('title' => $title, 'url' => $url);
                            $my_xml_file_path = $my_file_path;
                            $my_sub_dir = dirname($my_file_path);
                            $my_sub_dir = str_replace('\\', '/', $my_sub_dir);
                            $my_xml_sub_dir = $my_sub_dir;
                            // Give a <resource> child to the <resources> element.
                            $my_resource = $xmldoc->createElement('resource');
                            $my_resource->setAttribute('identifier', 'RESOURCE_'.$item->get_id());
                            $my_resource->setAttribute('type', 'webcontent');
                            $my_resource->setAttribute('href', $my_xml_file_path);
                            // adlcp:scormtype can be either 'sco' or 'asset'.
                            $my_resource->setAttribute('adlcp:scormtype', 'asset');
                            // xml:base is the base directory to find the files declared in this resource.
                            $my_resource->setAttribute('xml:base', '');
                            // give a <file> child to the <resource> element.
                            $my_file = $xmldoc->createElement('file');
                            $my_file->setAttribute('href', $my_xml_file_path);
                            $my_resource->appendChild($my_file);
                            $resources->appendChild($my_resource);
                        }
                        break;
                    case TOOL_QUIZ:
                        $exe_id = $item->path; // Should be using ref when everything will be cleaned up in this regard.
                        $exe = new Exercise();
                        $exe->read($exe_id);
                        $my_item = $xmldoc->createElement('item');
                        $my_item->setAttribute('identifier', 'ITEM_'.$item->get_id());
                        $my_item->setAttribute('identifierref', 'RESOURCE_'.$item->get_id());
                        $my_item->setAttribute('isvisible', 'true');
                        // Give a child element <title> to the <item> element.
                        $my_title = $xmldoc->createElement('title', htmlspecialchars(api_utf8_encode($item->get_title()), ENT_QUOTES, 'UTF-8'));
                        $my_item->appendChild($my_title);
                        $my_max_score = $xmldoc->createElement('max_score', $item->get_max());
                        //$my_item->appendChild($my_max_score);
                        // Give a child element <adlcp:prerequisites> to the <item> element.
                        $my_prereqs = $xmldoc->createElement('adlcp:prerequisites', $item->get_prereq_string());
                        $my_prereqs->setAttribute('type','aicc_script');
                        $my_item->appendChild($my_prereqs);
                        // Give a child element <adlcp:masteryscore> to the <item> element.
                        $my_masteryscore = $xmldoc->createElement('adlcp:masteryscore', $item->get_mastery_score());
                        $my_item->appendChild($my_masteryscore);

                        // Attach this item to the organization element or hits parent if there is one.
                        if (!empty($item->parent) && $item->parent != 0) {
                            $children = $organization->childNodes;
                            for ($i = 0; $i < $children->length; $i++) {
                                $item_temp = $children->item($i);
                                if ($item_temp -> nodeName == 'item') {
                                    if ($item_temp->getAttribute('identifier') == 'ITEM_'.$item->parent) {
                                        $item_temp -> appendChild($my_item);
                                    }
                                }
                            }
                        } else {
                            $organization->appendChild($my_item);
                        }

                        // Get the path of the file(s) from the course directory root
                        //$my_file_path = $item->get_file_path('scorm/'.$this->path.'/');
                        $my_file_path = 'quiz_'.$item->get_id().'.html';
                        // Write the contents of the exported exercise into a (big) html file
                        // to later pack it into the exported SCORM. The file will be removed afterwards.
                        $contents = ScormSection::export_exercise_to_scorm($exe_id, true);
                        $tmp_file_path = $archive_path.$temp_dir_short.'/'.$my_file_path;
                        $res = file_put_contents($tmp_file_path, $contents);
                        if ($res === false) { error_log('Could not write into file '.$tmp_file_path.' '.__FILE__.' '.__LINE__, 0); }
                        $files_cleanup[] = $tmp_file_path;
                        //error_log($tmp_path); die();
                        //$my_xml_file_path = api_htmlentities(api_utf8_encode($my_file_path), ENT_QUOTES, 'UTF-8');
                        $my_xml_file_path = $my_file_path;
                        $my_sub_dir = dirname($my_file_path);
                        $my_sub_dir = str_replace('\\', '/', $my_sub_dir);
                        //$my_xml_sub_dir = api_htmlentities(api_utf8_encode($my_sub_dir), ENT_QUOTES, 'UTF-8');
                        $my_xml_sub_dir = $my_sub_dir;
                        // Give a <resource> child to the <resources> element.
                        $my_resource = $xmldoc->createElement('resource');
                        $my_resource->setAttribute('identifier', 'RESOURCE_'.$item->get_id());
                        $my_resource->setAttribute('type', 'webcontent');
                        $my_resource->setAttribute('href', $my_xml_file_path);
                        // adlcp:scormtype can be either 'sco' or 'asset'.
                        $my_resource->setAttribute('adlcp:scormtype', 'sco');
                        // xml:base is the base directory to find the files declared in this resource.
                        $my_resource->setAttribute('xml:base', '');
                        // Give a <file> child to the <resource> element.
                        $my_file = $xmldoc->createElement('file');
                        $my_file->setAttribute('href', $my_xml_file_path);
                        $my_resource->appendChild($my_file);

                        // Get included docs.
                        $inc_docs = $item->get_resources_from_source(null,$tmp_file_path);
                        // Dependency to other files - not yet supported.
                        $i = 1;
                        foreach ($inc_docs as $doc_info) {
                            if (count($doc_info) < 1 || empty($doc_info[0])) { continue; }
                            $my_dep = $xmldoc->createElement('resource');
                            $res_id = 'RESOURCE_'.$item->get_id().'_'.$i;
                            $my_dep->setAttribute('identifier', $res_id);
                            $my_dep->setAttribute('type', 'webcontent');
                            $my_dep->setAttribute('adlcp:scormtype', 'asset');
                            $my_dep_file = $xmldoc->createElement('file');
                            // Check type of URL.
                            if ($doc_info[1] == 'remote') {
                                // Remote file. Save url as is.
                                $my_dep_file->setAttribute('href', $doc_info[0]);
                                $my_dep->setAttribute('xml:base', '');
                            } elseif ($doc_info[1] == 'local') {
                                switch ($doc_info[2]) {
                                    case 'url': // Local URL - save path as url for now, don't zip file.
                                        // Save file but as local file (retrieve from URL).
                                        $abs_path = api_get_path(SYS_PATH).str_replace(api_get_path(WEB_PATH), '', $doc_info[0]);
                                        $current_dir = dirname($abs_path);
                                        $current_dir = str_replace('\\', '/', $current_dir);
                                        $file_path = realpath($abs_path);
                                        $file_path = str_replace('\\', '/', $file_path);
                                        $my_dep_file->setAttribute('href', 'document/'.$file_path);
                                        $my_dep->setAttribute('xml:base', '');
                                        if (strstr($file_path, $main_path) !== false) {
                                            // The calculated real path is really inside the chamilo root path.
                                            // Reduce file path to what's under the DocumentRoot.
                                            $file_path = substr($file_path, strlen($root_path));
                                            //echo $file_path;echo '<br /><br />';
                                            //error_log('Reduced path: '.$file_path, 0);
                                            $zip_files_abs[] = $file_path;
                                            $link_updates[$my_file_path][] = array('orig' => $doc_info[0], 'dest' => 'document/'.$file_path);
                                            $my_dep_file->setAttribute('href', 'document/'.$file_path);
                                            $my_dep->setAttribute('xml:base', '');
                                        } elseif (empty($file_path)) {
                                            /*$document_root = substr(api_get_path(SYS_PATH), 0, strpos(api_get_path(SYS_PATH),api_get_path(REL_PATH)));
                                            if (strpos($document_root,-1) == '/') {
                                                $document_root = substr(0, -1, $document_root);
                                            }*/
                                            $file_path = $_SERVER['DOCUMENT_ROOT'].$abs_path;
                                            $file_path = str_replace('//', '/', $file_path);
                                            if (file_exists($file_path)) {
                                                $file_path = substr($file_path, strlen($current_dir)); // We get the relative path.
                                                $zip_files[] = $my_sub_dir.'/'.$file_path;
                                                $link_updates[$my_file_path][] = array('orig' => $doc_info[0], 'dest' => 'document/'.$file_path);
                                                $my_dep_file->setAttribute('href', 'document/'.$file_path);
                                                $my_dep->setAttribute('xml:base', '');
                                            }
                                        }
                                        break;
                                    case 'abs': // Absolute path from DocumentRoot. Save file and leave path as is in the zip.
                                        $current_dir = dirname($current_course_path.'/'.$item->get_file_path()).'/';
                                        $current_dir = str_replace('\\', '/', $current_dir);
                                        $file_path = realpath($doc_info[0]);
                                        $file_path = str_replace('\\', '/', $file_path);
                                        $my_dep_file->setAttribute('href', $file_path);
                                        $my_dep->setAttribute('xml:base', '');

                                        if (strstr($file_path,$main_path) !== false) {
                                            // The calculated real path is really inside the chamilo root path.
                                            // Reduce file path to what's under the DocumentRoot.
                                            $file_path = substr($file_path, strlen($root_path));
                                            //echo $file_path;echo '<br /><br />';
                                            //error_log('Reduced path: '.$file_path, 0);
                                            $zip_files_abs[] = $file_path;
                                            $link_updates[$my_file_path][] = array('orig' => $doc_info[0], 'dest' => $file_path);
                                            $my_dep_file->setAttribute('href', 'document/'.$file_path);
                                            $my_dep->setAttribute('xml:base', '');
                                        } elseif (empty($file_path)) {
                                            /*$document_root = substr(api_get_path(SYS_PATH), 0, strpos(api_get_path(SYS_PATH), api_get_path(REL_PATH)));
                                            if (strpos($document_root,-1) == '/') {
                                                $document_root = substr(0, -1, $document_root);
                                            }*/
                                            $file_path = $_SERVER['DOCUMENT_ROOT'].$doc_info[0];
                                            $file_path = str_replace('//', '/', $file_path);
                                            if (file_exists($file_path)) {
                                                $file_path = substr($file_path,strlen($current_dir)); // We get the relative path.
                                                $zip_files[] = $my_sub_dir.'/'.$file_path;
                                                $link_updates[$my_file_path][] = array('orig' => $doc_info[0], 'dest' => $file_path);
                                                $my_dep_file->setAttribute('href', 'document/'.$file_path);
                                                $my_dep->setAttribute('xml:base', '');
                                            }
                                        }
                                        break;
                                    case 'rel': // Path relative to the current document. Save xml:base as current document's directory and save file in zip as subdir.file_path
                                        if (substr($doc_info[0], 0, 2) == '..') {
                                            // Relative path going up.
                                            $current_dir = dirname($current_course_path.'/'.$item->get_file_path()).'/';
                                            $current_dir = str_replace('\\', '/', $current_dir);
                                            $file_path = realpath($current_dir.$doc_info[0]);
                                            $file_path = str_replace('\\', '/', $file_path);
                                            //error_log($file_path.' <-> '.$main_path, 0);
                                            if (strstr($file_path, $main_path) !== false) {
                                                // The calculated real path is really inside Chamilo's root path.
                                                // Reduce file path to what's under the DocumentRoot.

                                                $file_path = substr($file_path, strlen($root_path));
                                                $file_path_dest = $file_path;

                                                // File path is courses/CHAMILO/document/....
                                                $info_file_path = explode('/', $file_path);
                                                if ($info_file_path[0] == 'courses') { // Add character "/" in file path.
                                                    $file_path_dest = 'document/'.$file_path;
                                                }

                                                //error_log('Reduced path: '.$file_path, 0);
                                                $zip_files_abs[] = $file_path;

                                                $link_updates[$my_file_path][] = array('orig' => $doc_info[0], 'dest' => $file_path_dest);
                                                $my_dep_file->setAttribute('href', 'document/'.$file_path);
                                                $my_dep->setAttribute('xml:base', '');
                                            }
                                        } else {
                                            $zip_files[] = $my_sub_dir.'/'.$doc_info[0];
                                            $my_dep_file->setAttribute('href', $doc_info[0]);
                                            $my_dep->setAttribute('xml:base', $my_xml_sub_dir);
                                        }
                                        break;
                                    default:
                                        $my_dep_file->setAttribute('href', $doc_info[0]); // ../../courses/
                                        $my_dep->setAttribute('xml:base', '');
                                        break;
                                }
                            }
                            $my_dep->appendChild($my_dep_file);
                            $resources->appendChild($my_dep);
                            $dependency = $xmldoc->createElement('dependency');
                            $dependency->setAttribute('identifierref', $res_id);
                            $my_resource->appendChild($dependency);
                            $i++;
                        }
                        $resources->appendChild($my_resource);
                        $zip_files[] = $my_file_path;
                        break;
                    default:
                        // Get the path of the file(s) from the course directory root
                        $my_file_path = 'non_exportable.html';
                        //$my_xml_file_path = api_htmlentities(api_utf8_encode($my_file_path), ENT_COMPAT, 'UTF-8');
                        $my_xml_file_path = $my_file_path;
                        $my_sub_dir = dirname($my_file_path);
                        $my_sub_dir = str_replace('\\', '/', $my_sub_dir);
                        //$my_xml_sub_dir = api_htmlentities(api_utf8_encode($my_sub_dir), ENT_COMPAT, 'UTF-8');
                        $my_xml_sub_dir = $my_sub_dir;
                        // Give a <resource> child to the <resources> element.
                        $my_resource = $xmldoc->createElement('resource');
                        $my_resource->setAttribute('identifier', 'RESOURCE_'.$item->get_id());
                        $my_resource->setAttribute('type', 'webcontent');
                        $my_resource->setAttribute('href', $folder_name.'/'.$my_xml_file_path);
                        // adlcp:scormtype can be either 'sco' or 'asset'.
                        $my_resource->setAttribute('adlcp:scormtype', 'asset');
                        // xml:base is the base directory to find the files declared in this resource.
                        $my_resource->setAttribute('xml:base', '');
                        // Give a <file> child to the <resource> element.
                        $my_file = $xmldoc->createElement('file');
                        $my_file->setAttribute('href', 'document/'.$my_xml_file_path);
                        $my_resource->appendChild($my_file);
                        $resources->appendChild($my_resource);
                        break;
                }
            }
        }

        $organizations->appendChild($organization);
        $root->appendChild($organizations);
        $root->appendChild($resources);
        $xmldoc->appendChild($root);

        // TODO: Add a readme file here, with a short description and a link to the Reload player
        // then add the file to the zip, then destroy the file (this is done automatically).
        // http://www.reload.ac.uk/scormplayer.html - once done, don't forget to close FS#138

        foreach ($zip_files as $file_path) {
            if (empty($file_path)) {
                continue;
            }

            $dest_file = $archive_path.$temp_dir_short.'/'.$file_path;
            if (!empty($path_to_remove) && !empty($path_to_replace)) {
                $dest_file = str_replace($path_to_remove, $path_to_replace, $dest_file);
            }
            $this->create_path($dest_file);
            @copy($sys_course_path.$_course['path'].'/'.$file_path, $dest_file);
            // Check if the file needs a link update.
            if (in_array($file_path, array_keys($link_updates))) {
                $string = file_get_contents($dest_file);
                unlink($dest_file);
                foreach ($link_updates[$file_path] as $old_new) {
                    // This is an ugly hack that allows .flv files to be found by the flv player that
                    // will be added in document/main/inc/lib/flv_player/flv_player.swf and that needs
                    // to find the flv to play in document/main/, so we replace main/ in the flv path by
                    // ../../.. to return from inc/lib/flv_player to the document/main path.
                    if (substr($old_new['dest'], -3) == 'flv' && substr($old_new['dest'], 0, 5) == 'main/') {
                        $old_new['dest'] = str_replace('main/', '../../../', $old_new['dest']);
                    } elseif (substr($old_new['dest'], -3) == 'flv' && substr($old_new['dest'], 0, 6) == 'video/') {
                        $old_new['dest'] = str_replace('video/', '../../../../video/', $old_new['dest']);
                    }
                    //Fix to avoid problems with default_course_document
                    if (strpos("main/default_course_document", $old_new['dest'] === false)) {
                        //$newDestination = str_replace('document/', $mult.'document/', $old_new['dest']);
                        $newDestination = $old_new['dest'];
                    } else {
                        $newDestination = str_replace('document/', '', $old_new['dest']);
                    }
                    $string = str_replace($old_new['orig'], $newDestination, $string);

                    //Add files inside the HTMLs
                    $new_path = str_replace('/courses/', '', $old_new['orig']);
                    $destinationFile = $archive_path.$temp_dir_short.'/'.$old_new['dest'];
                    if (file_exists($sys_course_path.$new_path)) {
                        copy($sys_course_path.$new_path, $destinationFile);
                    }
                }
                file_put_contents($dest_file, $string);
            }
        }

        foreach ($zip_files_abs as $file_path) {
            if (empty($file_path)) {
                continue;
            }
            if (!is_file($main_path.$file_path) || !is_readable($main_path.$file_path)) {
                continue;
            }

            $dest_file = $archive_path.$temp_dir_short.'/document/'.$file_path;
            $this->create_path($dest_file);
            copy($main_path.$file_path, $dest_file);
            // Check if the file needs a link update.
            if (in_array($file_path, array_keys($link_updates))) {
                $string = file_get_contents($dest_file);
                unlink($dest_file);
                foreach ($link_updates[$file_path] as $old_new) {
                    // This is an ugly hack that allows .flv files to be found by the flv player that
                    // will be added in document/main/inc/lib/flv_player/flv_player.swf and that needs
                    // to find the flv to play in document/main/, so we replace main/ in the flv path by
                    // ../../.. to return from inc/lib/flv_player to the document/main path.
                    if (substr($old_new['dest'], -3) == 'flv' && substr($old_new['dest'], 0, 5) == 'main/') {
                        $old_new['dest'] = str_replace('main/', '../../../', $old_new['dest']);
                    }
                    $string = str_replace($old_new['orig'], $old_new['dest'], $string);
                }
                file_put_contents($dest_file, $string);
            }
        }

        if (is_array($links_to_create)) {
            foreach ($links_to_create as $file => $link) {
                $file_content = '<!DOCTYPE html><head>
                                <meta charset="'.api_get_language_isocode().'" />
                                <title>'.$link['title'].'</title>
                                </head>
                                <body dir="'.api_get_text_direction().'">
                                <div style="text-align:center">
                                <a href="'.$link['url'].'">'.$link['title'].'</a></div>
                                </body>
                                </html>';
                file_put_contents($archive_path.$temp_dir_short.'/'.$file, $file_content);
            }
        }

        // Add non exportable message explanation.
        $lang_not_exportable = get_lang('ThisItemIsNotExportable');
        $file_content = '<!DOCTYPE html><head>
                        <meta charset="'.api_get_language_isocode().'" />
                        <title>'.$lang_not_exportable.'</title>
                        <meta http-equiv="Content-Type" content="text/html; charset='.api_get_system_encoding().'" />
                        </head>
                        <body dir="'.api_get_text_direction().'">';
        $file_content .=
            <<<EOD
                    <style>
            .error-message {
                font-family: arial, verdana, helvetica, sans-serif;
                border-width: 1px;
                border-style: solid;
                left: 50%;
                margin: 10px auto;
                min-height: 30px;
                padding: 5px;
                right: 50%;
                width: 500px;
                background-color: #FFD1D1;
                border-color: #FF0000;
                color: #000;
            }
        </style>
    <body>
        <div class="error-message">
            $lang_not_exportable
        </div>
    </body>
</html>
EOD;
        if (!is_dir($archive_path.$temp_dir_short.'/document')) {
            @mkdir($archive_path.$temp_dir_short.'/document', api_get_permissions_for_new_directories());
        }
        file_put_contents($archive_path.$temp_dir_short.'/document/non_exportable.html', $file_content);

        // Add the extra files that go along with a SCORM package.
        $main_code_path = api_get_path(SYS_CODE_PATH).'newscorm/packaging/';
        $extra_files = scandir($main_code_path);
        foreach ($extra_files as $extra_file) {
            if (strpos($extra_file, '.') === 0)
                continue;
            else {
                $dest_file = $archive_path . $temp_dir_short . '/' . $extra_file;
                $this->create_path($dest_file);
                copy($main_code_path.$extra_file, $dest_file);
            }
        }

        // Finalize the imsmanifest structure, add to the zip, then return the zip.

        $manifest = @$xmldoc->saveXML();
        $manifest = api_utf8_decode_xml($manifest); // The manifest gets the system encoding now.
        file_put_contents($archive_path.'/'.$temp_dir_short.'/imsmanifest.xml', $manifest);
        $zip_folder->add($archive_path.'/'.$temp_dir_short, PCLZIP_OPT_REMOVE_PATH, $archive_path.'/'.$temp_dir_short.'/');

        // Clean possible temporary files.
        foreach ($files_cleanup as $file) {
            $res = unlink($file);
            if ($res === false) {
                error_log(
                    'Could not delete temp file '.$file.' '.__FILE__.' '.__LINE__,
                    0
                );
            }
        }
        $name = api_replace_dangerous_char($this->get_name()).'.zip';
        DocumentManager::file_send_for_download($temp_zip_file, true, $name);
    }

    /**
     * @param int $lp_id
     * @return bool
     */
    public function scorm_export_to_pdf($lp_id)
    {
        $lp_id = intval($lp_id);
        $files_to_export = array();
        $course_data = api_get_course_info($this->cc);
        if (!empty($course_data)) {
            $scorm_path = api_get_path(SYS_COURSE_PATH).$course_data['path'].'/scorm/'.$this->path;

            $list = self::get_flat_ordered_items_list($lp_id);
            if (!empty($list)) {
                foreach ($list as $item_id) {
                    $item = $this->items[$item_id];
                    switch ($item->type) {
                        case 'document':
                            //Getting documents from a LP with chamilo documents
                            $file_data = DocumentManager::get_document_data_by_id($item->path, $this->cc);
                            // Try loading document from the base course.
                            if (empty($file_data) && !empty($sessionId)) {
                                $file_data = DocumentManager::get_document_data_by_id($item->path, $this->cc, false, 0);
                            }
                            $file_path = api_get_path(SYS_COURSE_PATH).$course_data['path'].'/document'.$file_data['path'];
                            if (file_exists($file_path)) {
                                $files_to_export[] = array('title'=>$item->get_title(),'path'=>$file_path);
                            }
                            break;
                        case 'asset': //commes from a scorm package generated by chamilo
                        case 'sco':
                            $file_path = $scorm_path.'/'.$item->path;
                            if (file_exists($file_path)) {
                                $files_to_export[] = array('title'=>$item->get_title(), 'path' => $file_path);
                            }
                            break;
                        case 'dokeos_chapter':
                        case 'dir':
                        case 'chapter':
                            $files_to_export[] = array('title'=> $item->get_title(), 'path'=>null);
                            break;
                    }
                }
            }
            $pdf = new PDF();
            $result = $pdf->html_to_pdf($files_to_export, $this->name, $this->cc, true);
            return $result;
        }

        return false;
    }

    /**
     * Temp function to be moved in main_api or the best place around for this.
     * Creates a file path if it doesn't exist
     * @param string $path
     */
    public function create_path($path)
    {
        $path_bits = explode('/', dirname($path));

        // IS_WINDOWS_OS has been defined in main_api.lib.php
        $path_built = IS_WINDOWS_OS ? '' : '/';

        foreach ($path_bits as $bit) {
            if (!empty ($bit)) {
                $new_path = $path_built . $bit;
                if (is_dir($new_path)) {
                    $path_built = $new_path . '/';
                } else {
                    mkdir($new_path, api_get_permissions_for_new_directories());
                    $path_built = $new_path . '/';
                }
            }
        }
    }

    /**
     * Delete the image relative to this learning path. No parameter. Only works on instanciated object.
     * @return	boolean	The results of the unlink function, or false if there was no image to start with
     */
    public function delete_lp_image()
    {
        $img = $this->get_preview_image();
        if ($img != '') {
            $del_file = $this->get_preview_image_path(null, 'sys');
            if (isset($del_file) && file_exists($del_file)) {
                $del_file_2 = $this->get_preview_image_path(64, 'sys');
                if (file_exists($del_file_2)) {
                    unlink($del_file_2);
                }
                $this->set_preview_image('');
                return @unlink($del_file);
            }
        }
        return false;
    }

    /**
     * Uploads an author image to the upload/learning_path/images directory
     * @param	array	The image array, coming from the $_FILES superglobal
     * @return	boolean	True on success, false on error
     */
    public function upload_image($image_array)
    {
        $image_moved = false;
        if (!empty ($image_array['name'])) {
            $upload_ok = process_uploaded_file($image_array);
            $has_attachment = true;
        } else {
            $image_moved = true;
        }

        if ($upload_ok) {
            if ($has_attachment) {
                $courseDir = api_get_course_path() . '/upload/learning_path/images';
                $sys_course_path = api_get_path(SYS_COURSE_PATH);
                $updir = $sys_course_path . $courseDir;
                // Try to add an extension to the file if it hasn't one.
                $new_file_name = add_ext_on_mime(stripslashes($image_array['name']), $image_array['type']);

                if (!filter_extension($new_file_name)) {
                    //Display :: display_error_message(get_lang('UplUnableToSaveFileFilteredExtension'));
                    $image_moved = false;
                } else {
                    $file_extension = explode('.', $image_array['name']);
                    $file_extension = strtolower($file_extension[sizeof($file_extension) - 1]);
                    $filename = uniqid('');
                    $new_file_name = $filename.'.'.$file_extension;
                    $new_path = $updir.'/'.$new_file_name;

                    // Resize the image.
                    $temp = new Image($image_array['tmp_name']);
                    $picture_infos = $temp->get_image_info();
                    if ($picture_infos['width'] > 104) {
                        $thumbwidth = 104;
                    } else {
                        $thumbwidth = $picture_infos['width'];
                    }
                    if ($picture_infos['height'] > 96) {
                        $new_height = 96;
                    } else {
                        $new_height = $picture_infos['height'];
                    }

                    $temp->resize($thumbwidth, $new_height, 0);
                    $result = $temp->send_image($new_path);

                    // Storing the image filename.
                    if ($result) {
                        $image_moved = true;
                        $this->set_preview_image($new_file_name);

                        //Resize to 64px to use on course homepage
                        $temp->resize(64, 64, 0);
                        $temp->send_image($updir.'/'.$filename.'.64.'.$file_extension);
                        return true;
                    }
                }
            }
        }

        return false;
    }

    /**
     * @param int $lp_id
     * @param string $status
     */
    public function set_autolaunch($lp_id, $status)
    {
        $course_id = api_get_course_int_id();
        $lp_id   = intval($lp_id);
        $status  = intval($status);
        $lp_table = Database::get_course_table(TABLE_LP_MAIN);

        // Setting everything to autolaunch = 0
        $attributes['autolaunch'] = 0;
        $where = array('session_id = ? AND c_id = ? '=> array(api_get_session_id(), $course_id));
        Database::update($lp_table, $attributes, $where);
        if ($status == 1) {
            //Setting my lp_id to autolaunch = 1
            $attributes['autolaunch'] = 1;
            $where = array('id = ? AND session_id = ? AND c_id = ?'=> array($lp_id, api_get_session_id(), $course_id));
            Database::update($lp_table, $attributes, $where );
        }
    }

    /**
     * Gets previous_item_id for the next element of the lp_item table
     * @author Isaac flores paz
     * @return	integer	Previous item ID
     */
    public function select_previous_item_id()
    {
        $course_id = api_get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::select_previous_item_id()', 0);
        }
        $table_lp_item = Database::get_course_table(TABLE_LP_ITEM);

        // Get the max order of the items
        $sql_max_order = "SELECT max(display_order) AS display_order FROM $table_lp_item
    	                  WHERE c_id = $course_id AND lp_id = '" . $this->lp_id . "'";
        $rs_max_order = Database::query($sql_max_order);
        $row_max_order = Database::fetch_object($rs_max_order);
        $max_order = $row_max_order->display_order;
        // Get the previous item ID
        $sql = "SELECT id as previous FROM $table_lp_item
                WHERE c_id = $course_id AND lp_id = '" . $this->lp_id . "' AND display_order = '".$max_order."' ";
        $rs_max = Database::query($sql);
        $row_max = Database::fetch_object($rs_max);

        // Return the previous item ID
        return $row_max->previous;
    }

    /**
     * Copies an LP
     */
    public function copy()
    {
        $main_path = api_get_path(SYS_CODE_PATH);
        require_once $main_path.'coursecopy/classes/CourseBuilder.class.php';
        require_once $main_path.'coursecopy/classes/CourseArchiver.class.php';
        require_once $main_path.'coursecopy/classes/CourseRestorer.class.php';
        require_once $main_path.'coursecopy/classes/CourseSelectForm.class.php';

        //Course builder
        $cb = new CourseBuilder();

        //Setting tools that will be copied
        $cb->set_tools_to_build(array('learnpaths'));

        //Setting elements that will be copied
        $cb->set_tools_specific_id_list(
            array('learnpaths' => array($this->lp_id))
        );

        $course = $cb->build();

        //Course restorer
        $course_restorer = new CourseRestorer($course);
        $course_restorer->set_add_text_in_items(true);
        $course_restorer->set_tool_copy_settings(array('learnpaths' => array('reset_dates' => true)));
        $course_restorer->restore(api_get_course_id(), api_get_session_id(), false, false);
    }

    public function verify_document_size($s)
    {
        $post_max = ini_get('post_max_size');
        if (substr($post_max, -1, 1) == 'M') {
            $post_max = intval(substr($post_max, 0, -1)) * 1024 * 1024;
        } elseif (substr($post_max, -1, 1) == 'G') {
            $post_max = intval(substr($post_max, 0, -1)) * 1024 * 1024 * 1024;
        }
        $upl_max = ini_get('upload_max_filesize');
        if (substr($upl_max, -1, 1) == 'M') {
            $upl_max = intval(substr($upl_max, 0, -1)) * 1024 * 1024;
        } elseif (substr($upl_max, -1, 1) == 'G') {
            $upl_max = intval(substr($upl_max, 0, -1)) * 1024 * 1024 * 1024;
        }
        $documents_total_space = DocumentManager::documents_total_space();
        $course_max_space = DocumentManager::get_course_quota();
        $total_size = filesize($s) + $documents_total_space;
        if (filesize($s)>$post_max || filesize($s)>$upl_max  || $total_size>$course_max_space ){
            return true;
        } else{
            return false;
        }
    }

    /**
     * Clear LP prerequisites
     */
    public function clear_prerequisites()
    {
        $course_id = $this->get_course_int_id();
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::clear_prerequisites()', 0);
        }
        $tbl_lp_item = Database :: get_course_table(TABLE_LP_ITEM);
        $lp_id = $this->get_id();
        //Cleaning prerequisites
        $sql = "UPDATE $tbl_lp_item SET prerequisite = ''
                WHERE c_id = ".$course_id." AND lp_id = '$lp_id'";
        Database::query($sql);

        //Cleaning mastery score for exercises
        $sql = "UPDATE $tbl_lp_item SET mastery_score = ''
                WHERE c_id = ".$course_id." AND lp_id = '$lp_id' AND item_type = 'quiz'";
        Database::query($sql);
    }

    public function set_previous_step_as_prerequisite_for_all_items()
    {
        $tbl_lp_item = Database :: get_course_table(TABLE_LP_ITEM);
        $course_id = $this->get_course_int_id();
        $lp_id = $this->get_id();

        if (!empty($this->items)) {
            $previous_item_id = null;
            $previous_item_max = 0;
            $previous_item_type = null;
            $last_item_not_chapter = null;
            $last_item_not_chapter_type = null;
            $last_item_not_chapter_max = null;
            foreach ($this->items as $item) {
                // if there was a previous item... (otherwise jump to set it)
                if (!empty($previous_item_id)) {
                    $current_item_id = $item->get_id(); //save current id
                    if (!in_array($item->get_type(), array('dokeos_chapter', 'chapter'))) {
                        // Current item is not a folder, so it qualifies to get a prerequisites
                        if ($last_item_not_chapter_type == 'quiz') {
                            // if previous is quiz, mark its max score as default score to be achieved
                            $sql = "UPDATE $tbl_lp_item SET mastery_score = '$last_item_not_chapter_max'
                                    WHERE c_id = ".$course_id." AND lp_id = '$lp_id' AND id = '$last_item_not_chapter'";
                            Database::query($sql);
                        }
                        // now simply update the prerequisite to set it to the last non-chapter item
                        $sql = "UPDATE $tbl_lp_item SET prerequisite = '$last_item_not_chapter'
                                WHERE c_id = ".$course_id." AND lp_id = '$lp_id' AND id = '$current_item_id'";
                        Database::query($sql);
                        // record item as 'non-chapter' reference
                        $last_item_not_chapter = $item->get_id();
                        $last_item_not_chapter_type = $item->get_type();
                        $last_item_not_chapter_max = $item->get_max();
                    }
                } else {
                    if (!in_array($item->get_type(), array('dokeos_chapter', 'chapter'))) {
                        // Current item is not a folder (but it is the first item) so record as last "non-chapter" item
                        $last_item_not_chapter = $item->get_id();
                        $last_item_not_chapter_type = $item->get_type();
                        $last_item_not_chapter_max = $item->get_max();
                    }
                }
                // Saving the item as "previous item" for the next loop
                $previous_item_id = $item->get_id();
                $previous_item_max = $item->get_max();
                $previous_item_type = $item->get_type();
            }
        }
    }

    /**
     * @param array $params
     */
    public static function createCategory($params)
    {
        $em = Database::getManager();
        $item = new CLpCategory();
        $item->setName($params['name']);
        $item->setCId($params['c_id']);
        $em->persist($item);
        $em->flush();
    }
    /**
     * @param array $params
     */
    public static function updateCategory($params)
    {
        $em = Database::getManager();
        /** @var CLpCategory $item */
        $item = $em->find('ChamiloCourseBundle:CLpCategory', $params['id']);
        if ($item) {
            $item->setName($params['name']);
            $em->merge($item);
            $em->flush();
        }
    }

    /**
     * @param int $id
     */
    public static function moveUpCategory($id)
    {
        $em = Database::getManager();
        /** @var CLpCategory $item */
        $item = $em->find('ChamiloCourseBundle:CLpCategory', $id);
        if ($item) {
            $position = $item->getPosition() - 1;
            $item->setPosition($position);
            $em->persist($item);
            $em->flush();
        }
    }

    /**
     * @param int $id
     */
    public static function moveDownCategory($id)
    {
        $em = Database::getManager();
        /** @var CLpCategory $item */
        $item = $em->find('ChamiloCourseBundle:CLpCategory', $id);
        if ($item) {
            $position = $item->getPosition() + 1;
            $item->setPosition($position);
            $em->persist($item);
            $em->flush();
        }
    }

    /**
     * @param int $courseId
     * @return int|mixed
     */
    public static function getCountCategories($courseId)
    {
        if (empty($course_id)) {
            return 0;
        }
        $em = Database::getManager();
        $query = $em->createQuery('SELECT COUNT(u.id) FROM ChamiloCourseBundle:CLpCategory u WHERE u.cId = :id');
        $query->setParameter('id', $courseId);

        return $query->getSingleScalarResult();
    }

    /**
     * @param int $courseId
     *
     * @return mixed
     */
    public static function getCategories($courseId)
    {
        $em = Database::getManager();
        //Default behaviour
        /*$items = $em->getRepository('ChamiloCourseBundle:CLpCategory')->findBy(
            array('cId' => $course_id),
            array('name' => 'ASC')
        );*/

        // Using doctrine extensions
        $items = $em->getRepository('ChamiloCourseBundle:CLpCategory')->getBySortableGroupsQuery(
            array('cId' => $courseId)
        )->getResult();

        return $items;
    }

    /**
     * @param int $id
     *
     * @return mixed
     */
    public static function getCategory($id)
    {
        $em = Database::getManager();
        $item = $em->find('ChamiloCourseBundle:CLpCategory', $id);

        return $item;
    }

    /**
     * @param int $courseId
     * @return array
     */
    public static function getCategoryByCourse($courseId)
    {
        $em = Database::getManager();
        $items = $em->getRepository('ChamiloCourseBundle:CLpCategory')->findBy(array('cId' => $courseId));

        return $items;
    }

    /**
     * @param int $id
     *
     * @return mixed
     */
    public static function deleteCategory($id)
    {
        $em = Database::getManager();
        $item = $em->find('ChamiloCourseBundle:CLpCategory', $id);
        if ($item) {

            $courseId = $item->getCId();
            $query = $em->createQuery('SELECT u FROM ChamiloCourseBundle:CLp u WHERE u.cId = :id AND u.categoryId = :catId');
            $query->setParameter('id', $courseId);
            $query->setParameter('catId', $item->getId());
            $lps = $query->getResult();

            // Setting category = 0.
            if ($lps) {
                foreach ($lps as $lpItem) {
                    $lpItem->setCategoryId(0);
                }
            }

            // Removing category.
            $em->remove($item);
            $em->flush();
        }
    }

    /**
     * @param int $courseId
     * @param bool $addSelectOption
     *
     * @return mixed
     */
    static function getCategoryFromCourseIntoSelect($courseId, $addSelectOption = false)
    {
        $items = self::getCategoryByCourse($courseId);
        $cats = array();
        if ($addSelectOption) {
            $cats = array(get_lang('SelectACategory'));
        }

        if (!empty($items)) {
            foreach ($items as $cat) {
                $cats[$cat->getId()] = $cat->getName();
            }
        }

        return $cats;
    }

    /**
     * Return the scorm item type object with spaces replaced with _
     * The return result is use to build a css classname like scorm_type_$return
     * @param $in_type
     * @return mixed
     */
    private static function format_scorm_type_item($in_type)
    {
        return str_replace(' ', '_', $in_type);
    }

    /**
     * @return \learnpath
     */
    public static function getLpFromSession($courseCode, $lp_id, $user_id)
    {
        $lpObject = Session::read('lpobject');
        $learnPath = null;
        if (isset($lpObject)) {
            $learnPath = unserialize($lpObject);
        }

        if (!is_object($learnPath)) {
            $learnPath = new learnpath($courseCode, $lp_id, $user_id);
        }

        return $learnPath;
    }

    /**
     * @param int $itemId
     * @return learnpathItem|false
     */
    public function getItem($itemId)
    {
        if (isset($this->items[$itemId]) && is_object($this->items[$itemId])) {
            return $this->items[$itemId];
        }

        return false;
    }

    /**
     * @return int
     */
    public function getCategoryId()
    {
        return $this->categoryId;
    }

    /**
     * @param int $categoryId
     * @return bool
     */
    public function setCategoryId($categoryId)
    {
        $this->categoryId = intval($categoryId);

        $courseId = api_get_course_int_id();
        $lp_table = Database :: get_course_table(TABLE_LP_MAIN);
        $lp_id = $this->get_id();
        $sql = "UPDATE $lp_table SET category_id = ".$this->categoryId."
                WHERE c_id = $courseId AND id = $lp_id";
        Database::query($sql);

        return true;
    }

    /**
     * Get whether this is a learning path with the possibility to subscribe
     * users or not
     * @return int
     */
    public function getSubscribeUsers()
    {
        return $this->subscribeUsers;
    }

    /**
     * Set whether this is a learning path with the possibility to subscribe
     * users or not
     * @param int $subscribeUsers (0 = false, 1 = true)
     */
    public function setSubscribeUsers($value)
    {
        if ($this->debug > 0) {
            error_log('New LP - In learnpath::set_subscribe_users()', 0);
        }
        $this->subscribeUsers = intval($value);;
        $lp_table = Database :: get_course_table(TABLE_LP_MAIN);
        $lp_id = $this->get_id();
        $sql = "UPDATE $lp_table SET subscribe_users = ".$this->subscribeUsers."
                WHERE c_id = ".$this->course_int_id." AND id = $lp_id";
        Database::query($sql);

        return true;
    }

    /**
     * Calculate the count of stars for a user in this LP
     * @param int $sessionId Optional. The session ID
     * @return int The count of stars
     */
    public function getCalculateStars($sessionId = 0)
    {
        $stars = 0;

        $progress = self::getProgress($this->lp_id, $this->user_id, $this->course_int_id, $sessionId);

        if ($progress > 50) {
            $stars++;
        }

        // Calculate stars chapters evaluation
        $exercisesItems = $this->getExercisesItems();

        if (!empty($exercisesItems)) {
            $totalResult = 0;

            foreach ($exercisesItems as $exerciseItem) {
                $exerciseResultInfo = Event::getExerciseResultsByUser(
                    $this->user_id,
                    $exerciseItem->path,
                    $this->course_int_id,
                    $sessionId,
                    $this->lp_id,
                    $exerciseItem->db_id
                );

                $exerciseResult = 0;

                foreach ($exerciseResultInfo as $result) {
                    $exerciseResult += $result['exe_result'] * 100 / $result['exe_weighting'];
                }

                $exerciseAverage = $exerciseResult / (count($exerciseResultInfo) > 0 ? count($exerciseResultInfo) : 1);

                $totalResult += $exerciseAverage;
            }

            $totalExerciseAverage = $totalResult / (count($exercisesItems) > 0 ? count($exercisesItems) : 1);

            if ($totalExerciseAverage >= 50) {
                $stars++;
            }

            if ($totalExerciseAverage >= 80) {
                $stars++;
            }
        }

        // Calculate star for final evaluation
        $finalEvaluationItem = $this->getFinalEvaluationItem();

        if (!empty($finalEvaluationItem)) {
            $evaluationResultInfo = Event::getExerciseResultsByUser(
                $this->user_id,
                $finalEvaluationItem->path,
                $this->course_int_id,
                $sessionId,
                $this->lp_id,
                $finalEvaluationItem->db_id
            );

            $evaluationResult = 0;

            foreach ($evaluationResultInfo as $result) {
                $evaluationResult += $result['exe_result'] * 100 / $result['exe_weighting'];
            }

            $averageDivisor = count($evaluationResultInfo) > 0 ? count($evaluationResultInfo) : 1;

            $evaluationAverage = $evaluationResult / $averageDivisor;

            if ($evaluationAverage >= 80) {
                $stars++;
            }
        }

        return $stars;
    }

    /**
     * Get the items of exercise type
     * @return array The items. Otherwise return false
     */
    public function getExercisesItems()
    {
        $exercises = [];

        foreach ($this->items as $item) {
            if ($item->type != 'quiz') {
                continue;
            }

            $exercises[] = $item;
        }

        array_pop($exercises);

        return $exercises;
    }

    /**
     * Get the item of exercise type (evaluation type)
     * @return array The final evaluation. Otherwise return false
     */
    public function getFinalEvaluationItem()
    {
        $exercises = [];

        foreach ($this->items as $item) {
            if ($item->type != 'quiz') {
                continue;
            }

            $exercises[] = $item;
        }

        return array_pop($exercises);
    }

    /**
     * Calculate the total points achieved for the current user in this learning path
     * @param int $sessionId Optional. The session Id
     * @return int
     */
    public function getCalculateScore($sessionId = 0)
    {
        // Calculate stars chapters evaluation
        $exercisesItems = $this->getExercisesItems();
        $finalEvaluationItem = $this->getFinalEvaluationItem();

        $totalExercisesResult = 0;
        $totalEvaluationResult = 0;

        if ($exercisesItems !== false) {
            foreach ($exercisesItems as $exerciseItem) {
                $exerciseResultInfo = Event::getExerciseResultsByUser(
                    $this->user_id,
                    $exerciseItem->path,
                    $this->course_int_id,
                    $sessionId,
                    $this->lp_id,
                    $exerciseItem->db_id
                );

                $exerciseResult = 0;

                foreach ($exerciseResultInfo as $result) {
                    $exerciseResult += $result['exe_result'];
                }

                $totalExercisesResult += $exerciseResult;
            }
        }

        if (!empty($finalEvaluationItem)) {
            $evaluationResultInfo = Event::getExerciseResultsByUser(
                $this->user_id,
                $finalEvaluationItem->path,
                $this->course_int_id,
                $sessionId,
                $this->lp_id,
                $finalEvaluationItem->db_id
            );

            foreach ($evaluationResultInfo as $result) {
                $totalEvaluationResult += $result['exe_result'];
            }
        }

        return $totalExercisesResult + $totalEvaluationResult;
    }
}

if (!function_exists('trim_value')) {
    function trim_value(& $value) {
        $value = trim($value);
    }
}