<?php
/* For licensing terms, see /license.txt */
/**
 *    This is the tracking library for Chamilo
 *    Include/require it in your code to use its functionality.
 *
 *    @package chamilo.library
 *    @author Julio Montoya <gugli100@gmail.com> (Score average fixes)
 */

define('SESSION_LINK_TARGET','_self');

class Tracking {

    /**
     * Calculates the time spent on the platform by a user
     * @param int    User id
     * @param bool    True for calculating only time spent last week (optional)
     * @param int    Timestamp for filtering by Day (optional, default = 0)
     * @return timestamp $nb_seconds
     */
    public static function get_time_spent_on_the_platform($user_id, $last_week = false, $by_day = 0) {

        $tbl_track_login = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_LOGIN);

        $condition_time = '';
        if ($last_week) {
            $a_last_week = get_last_week();
            $fday_last_week = date('Y-m-d H:i:s',$a_last_week[0]);
            $lday_last_week = date('Y-m-d H:i:s',$a_last_week[6]);
            $condition_time = ' AND (login_date >= "'.$fday_last_week.'" AND logout_date <= "'.$lday_last_week.'") ';
        } else if (!empty($by_day)) {
            $fdate_time = date('Y-m-d',$by_day).' 00:00:00';
            $ldate_time = date('Y-m-d',$by_day).' 23:59:59';
            $condition_time = ' AND (login_date >= "'.$fdate_time.'" AND logout_date <= "'.$ldate_time.'" ) ';
        }

        $sql = 'SELECT login_date, logout_date FROM '.$tbl_track_login.'
                        WHERE login_user_id = '.intval($user_id).$condition_time;
        $rs = Database::query($sql);

        $nb_seconds = 0;

        $wrong_logout_dates = false;

        while ($a_connections = Database::fetch_array($rs)) {

            $s_login_date = $a_connections["login_date"];
            $s_logout_date = $a_connections["logout_date"];

            $i_timestamp_login_date = strtotime($s_login_date);
            $i_timestamp_logout_date = strtotime($s_logout_date);

            if($i_timestamp_logout_date>0)
            {
                $nb_seconds += ($i_timestamp_logout_date - $i_timestamp_login_date);
            }
            else
            { // there are wrong datas in db, then we can't give a wrong time
                $wrong_logout_dates = true;
            }

        }

        if($nb_seconds>0 || !$wrong_logout_dates)
        {
            return $nb_seconds;
        }
        else
        {
            return -1; //-1 means we have wrong datas in the db
        }
    }

    /**
     * Calculates the time spent on the course
     * @param     integer     User id
     * @param     string         Course code
     * @param     int            Session id (optional)
     * @return     timestamp     Time in seconds
     */
    public static function get_time_spent_on_the_course($user_id, $course_code, $session_id = 0) {
        // protect datas
        $course_code = Database::escape_string($course_code);
        $session_id  = intval($session_id);

        $tbl_track_course = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_COURSE_ACCESS);

        $condition_user = "";
        if (is_array($user_id)) {
            $condition_user = " AND user_id IN (".implode(',',$user_id).") ";
        } else {
            $user_id = intval($user_id);
            $condition_user = " AND user_id = '$user_id' ";
        }

        $sql = " SELECT SUM(UNIX_TIMESTAMP(logout_course_date)-UNIX_TIMESTAMP(login_course_date)) as nb_seconds
                FROM $tbl_track_course
                WHERE course_code='$course_code' AND session_id = '$session_id' $condition_user";

        $rs = Database::query($sql);
        $row = Database::fetch_array($rs);
        return $row['nb_seconds'];
    }

    /**
     * Get first connection date for a student
     * @param    int                  Student id
     * @return    string|bool     Date format long without day or false if there are no connections
     */
    public static function get_first_connection_date($student_id) {
        $tbl_track_login = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_LOGIN);
        $sql = 'SELECT login_date FROM ' . $tbl_track_login . '
                WHERE login_user_id = ' . intval($student_id) . '
                ORDER BY login_date ASC LIMIT 0,1';

        $rs = Database::query($sql);
        if(Database::num_rows($rs)>0) {
            if ($first_login_date = Database::result($rs, 0, 0)) {
                return api_convert_and_format_date($first_login_date, DATE_FORMAT_SHORT, date_default_timezone_get());
            }
        }
        return false;
    }


    /**
     * Get las connection date for a student
     * @param    int                  Student id
     * @param    bool            Show a warning message (optional)
     * @param    bool            True for returning results in timestamp (optional)
     * @return    string|int|bool Date format long without day, false if there are no connections or timestamp if parameter $return_timestamp is true
     */
    public static function get_last_connection_date($student_id, $warning_message = false, $return_timestamp = false) {
        $tbl_track_login = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_LOGIN);
        $sql = 'SELECT login_date FROM ' . $tbl_track_login . '
                        WHERE login_user_id = ' . intval($student_id) . '
                        ORDER BY login_date DESC LIMIT 0,1';

        $rs = Database::query($sql);
        if(Database::num_rows($rs)>0) {
            if ($last_login_date = Database::result($rs, 0, 0)) {
                $last_login_date = api_get_local_time($last_login_date);
                if ($return_timestamp) {
                    return api_strtotime($last_login_date,'UTC');
                } else {
                    if (!$warning_message) {
                        return api_format_date($last_login_date, DATE_FORMAT_SHORT);
                    } else {
                        $timestamp = api_strtotime($last_login_date,'UTC');
                        $currentTimestamp = time();

                        //If the last connection is > than 7 days, the text is red
                        //345600 = 7 days in seconds
                        if ($currentTimestamp - $timestamp > 604800)
                        {
                            return '<span style="color: #F00;">' . api_format_date($last_login_date, DATE_FORMAT_SHORT) . '</span>';
                        }
                        else
                        {
                            return api_format_date($last_login_date, DATE_FORMAT_SHORT);
                        }
                    }
                }
            }
        }
        return false;
    }
    

    /**
     * Get first user's connection date on the course
     * @param     int         User id
     * @param    string        Course code
     * @param    int            Session id (optional, default=0)
     * @return    string|bool    Date with format long without day or false if there is no date
     */
    public static function get_first_connection_date_on_the_course($student_id, $course_code, $session_id = 0, $convert_date = true) {

        // protect data
        $student_id  = intval($student_id);
        $course_code = Database::escape_string($course_code);
        $session_id  = intval($session_id);

        $tbl_track_login = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_COURSE_ACCESS);
        $sql = 'SELECT login_course_date FROM '.$tbl_track_login.'
                        WHERE user_id = '.$student_id.'
                        AND course_code = "'.$course_code.'"
                        AND session_id = '.$session_id.'
                        ORDER BY login_course_date ASC LIMIT 0,1';
        $rs = Database::query($sql);
        if (Database::num_rows($rs)>0) {
            if ($first_login_date = Database::result($rs, 0, 0)) {
                if ($convert_date) {
                    return api_convert_and_format_date($first_login_date, DATE_FORMAT_SHORT, date_default_timezone_get());
                } else {
                    return $first_login_date;
                }
            }
        }
        return false;
    }

    /**
     * Get last user's connection date on the course
     * @param     int         User id
     * @param    string        Course code
     * @param    int            Session id (optional, default=0)
     * @return    string|bool    Date with format long without day or false if there is no date
     */
    public static function get_last_connection_date_on_the_course($student_id, $course_code, $session_id = 0, $convert_date = true) {

        // protect data
        $student_id  = intval($student_id);
        $course_code = Database::escape_string($course_code);
        $session_id  = intval($session_id);

        $tbl_track_e_course_access = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_COURSE_ACCESS);
        $sql = 'SELECT login_course_date FROM '.$tbl_track_e_course_access.'
                        WHERE user_id = '.$student_id.'
                        AND course_code = "'.$course_code.'"
                        AND session_id = '.$session_id.'
                        ORDER BY login_course_date DESC LIMIT 0,1';

        $rs = Database::query($sql);
        if (Database::num_rows($rs)>0) {
            if ($last_login_date = Database::result($rs, 0, 0)) {
                $last_login_date = api_get_local_time($last_login_date, null, date_default_timezone_get());
                $timestamp = api_strtotime($last_login_date);
                $currentTimestamp = time();
                //If the last connection is > than 7 days, the text is red
                //345600 = 7 days in seconds
                if ($currentTimestamp - $timestamp > 604800) {
                    if ($convert_date) {
                        return '<span style="color: #F00;">' . api_format_date($last_login_date, DATE_FORMAT_SHORT) . (api_is_allowed_to_edit()?' <a href="'.api_get_path(REL_CODE_PATH).'announcements/announcements.php?action=add&remind_inactive='.$student_id.'" title="'.get_lang('RemindInactiveUser').'"><img align="middle" src="'.api_get_path(WEB_IMG_PATH).'messagebox_warning.gif" /></a>':'').'</span>';
                    } else {
                        return $last_login_date;
                    }
                } else {
                    if ($convert_date) {
                        return api_format_date($last_login_date, DATE_FORMAT_SHORT);
                    } else {
                        return $last_login_date;
                    }
                }
            }
        }
        return false;
    }

    /**
     * Get count of the connections to the course during a specified period
     * @param   string  Course code
     * @param   int     Session id (optional)
     * @param   int     Datetime from which to collect data (defaults to 0)
     * @param   int     Datetime to which to collect data (defaults to now)
     * @return  int     count connections
     */
    public static function get_course_connections_count($course_code, $session_id = 0, $start = 0, $stop = null) {

        // protect data
        $month_filter = '';
        if ($start < 0) { $start = 0; }
        if (!isset($stop) or ($stop < 0)) {
            $stop = api_get_utc_datetime();
        }
        $month_filter = " AND login_course_date > '$start' AND login_course_date < '$stop' ";

        $course_code = Database::escape_string($course_code);
        $session_id  = intval($session_id);
        $count = 0;

        $tbl_track_e_course_access = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_COURSE_ACCESS);
        $sql = "SELECT count(*) as count_connections FROM $tbl_track_e_course_access WHERE course_code = '$course_code' AND session_id = $session_id $month_filter";
        $rs = Database::query($sql);
        if (Database::num_rows($rs)>0) {
            $row = Database::fetch_object($rs);
            $count = $row->count_connections;
        }
        return $count;
    }

    /**
     * Get count courses per student
     * @param     int        Student id
     * @param    bool    Include sessions (optional)
     * @return  int        count courses
     */
    public static function count_course_per_student($user_id, $include_sessions = true) {

        $user_id = intval($user_id);
        $tbl_course_rel_user = Database :: get_main_table(TABLE_MAIN_COURSE_USER);
        $tbl_session_course_rel_user = Database :: get_main_table(TABLE_MAIN_SESSION_COURSE_USER);

        $sql = 'SELECT DISTINCT course_code
                        FROM ' . $tbl_course_rel_user . '
                        WHERE user_id = ' . $user_id.' AND relation_type<>'.COURSE_RELATION_TYPE_RRHH;
        $rs = Database::query($sql);
        $nb_courses = Database::num_rows($rs);

        if ($include_sessions) {
            $sql = 'SELECT DISTINCT course_code
                            FROM ' . $tbl_session_course_rel_user . '
                            WHERE id_user = ' . $user_id;
            $rs = Database::query($sql);
            $nb_courses += Database::num_rows($rs);
        }

        return $nb_courses;
    }

    /**
     * This function gets the score average from all tests in a course by student
     * @param     int|array     Student(s) id
     * @param     string         Course code
     * @param    int            Exercise id (optional), filtered by exercise
     * @param    int            Session id (optional), if param $session_id is null it'll return results including sessions, 0 = session is not filtered
     * @return     string         value (number %) Which represents a round integer about the score average.
     */
    public static function get_avg_student_exercise_score($student_id, $course_code, $exercise_id = 0, $session_id = null) {

        // protect datas
        $course_code = Database::escape_string($course_code);
        // get the informations of the course
        $a_course = CourseManager :: get_course_information($course_code);
        if(!empty($a_course['db_name'])) {
            // table definition
            $tbl_course_quiz = Database::get_course_table(TABLE_QUIZ_TEST,$a_course['db_name']);
            $tbl_stats_exercise = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_EXERCICES);

            // Compose a filter based on optional exercise given
            $condition_quiz = "";
            if (!empty($exercise_id)) {
                $exercise_id = intval($exercise_id);
                $condition_quiz =" AND id = $exercise_id ";
            }

            // Compose a filter based on optional session id given
            $condition_session = "";
            if (isset($session_id)) {
                $session_id = intval($session_id);
                $condition_session = " AND session_id = $session_id ";
            }
            $sql = "SELECT count(id) FROM $tbl_course_quiz WHERE active <> -1 $condition_quiz ";
            $count_quiz = Database::fetch_row(Database::query($sql));

            $quiz_avg_total_score = 0;
            if (!empty($count_quiz[0]) && !empty($student_id)) {
                $condition_user = "";
                if (is_array($student_id)) {
                    $condition_user = " AND exe_user_id IN (".implode(',',$student_id).") ";
                } else {
                    $condition_user = " AND exe_user_id = '$student_id' ";
                }

                if (empty($exercise_id)) {
                    $sql = "SELECT id FROM $tbl_course_quiz WHERE active <> -1 $condition_quiz";
                    $exercises = Database::fetch_row(Database::query($sql));
                    $exercise_list = array();
                    $exercise_id = 0;
                    if (!empty($exercises)) {
                        foreach($exercises as $row) {
                            $exercise_list[] = $row['id'];
                        }
                        $exercise_id = implode("','",$exercise_list);
                    }
                }

                $count_quiz = Database::fetch_row(Database::query($sql));

                $sql = "SELECT SUM(exe_result/exe_weighting*100) as avg_score, COUNT(*) as num_attempts
                        FROM $tbl_stats_exercise
                        WHERE exe_exo_id IN ('".$exercise_id."')
                        $condition_user
                        AND orig_lp_id = 0
                        AND exe_cours_id = '$course_code'
                        AND orig_lp_item_id = 0 $condition_session
                        ORDER BY exe_date DESC";                     
                        $res = Database::query($sql);
                        $row = Database::fetch_array($res);
                        $quiz_avg_score = 0;
                        if (!empty($row['avg_score'])) {
                            $quiz_avg_score = round($row['avg_score'],2);
                        }
                        if(!empty($row['num_attempts'])) {
                            $quiz_avg_score = round($quiz_avg_score / $row['num_attempts'], 2);
                        }
                        return $quiz_avg_score;
            }
        }
        return null;
    }


    /**
     * Get count student's exercise attempts
     * @param     int     Student id
     * @param    string    Course code
     * @param    int        Exercise id
     * @param    int        Learning path id (optional), for showing attempts inside a learning path $lp_id and $lp_item_id params are required.
     * @param    int        Learning path item id (optional), for showing attempts inside a learning path $lp_id and $lp_item_id params are required.
     * @return  int     count of attempts
     */
    public function count_student_exercise_attempts($student_id, $course_code, $exercise_id, $lp_id = 0, $lp_item_id = 0, $session_id = 0) {

        $course_code = Database::escape_string($course_code);
        $course_info = CourseManager :: get_course_information($course_code);
        $student_id  = intval($student_id);
        $exercise_id = intval($exercise_id);
        $session_id = intval($session_id);
        $count_attempts = 0;

        if (!empty($lp_id)) $lp_id = intval($lp_id);
        if (!empty($lp_item_id)) $lp_id = intval($lp_item_id);

        if (!empty($course_info['db_name'])) {
            $tbl_stats_exercices = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_EXERCICES, $course_info['db_name']);

            $sql = "SELECT COUNT(ex.exe_id) as essais FROM $tbl_stats_exercices AS ex
                    WHERE  ex.exe_cours_id = '$course_code'
                    AND ex.exe_exo_id = $exercise_id
                    AND orig_lp_id = $lp_id
                    AND orig_lp_item_id = $lp_item_id
                    AND exe_user_id= $student_id 
                    AND session_id = $session_id ";
            $rs = Database::query($sql);
            $row = Database::fetch_row($rs);
            $count_attempts = $row[0];
        }
        return $count_attempts;

    }

    /**
     * Returns the average student progress in the learning paths of the given
     * course.
     * @param   int/array    Student id(s)
     * @param   string        Course code
     * @param     array         Limit average to listed lp ids
     * @param    int            Session id (optional), if parameter $session_id is null(default) it'll return results including sessions, 0 = session is not filtered
     * @param    bool        Will return an array of the type: [sum_of_progresses, number] if it is set to true
     * @return double        Average progress of the user in this course
     */
    public static function get_avg_student_progress($student_id, $course_code, $lp_ids = array(), $session_id = null, $return_array = false) {

        // get the informations of the course
        $a_course = CourseManager :: get_course_information($course_code);
        if (!empty($a_course['db_name'])) {
            // table definition
            $tbl_course_lp_view = Database :: get_course_table(TABLE_LP_VIEW, $a_course['db_name']);
            $tbl_course_lp = Database :: get_course_table(TABLE_LP_MAIN, $a_course['db_name']);

            // Compose a filter based on optional learning paths list given
            $condition_lp = "";

            if (!empty($lp_ids)) {
                if (count($lp_ids) > 0) {
                    $condition_lp =" WHERE id IN(".implode(',',$lp_ids).") ";
                }
            }
            $session_id = intval($session_id);
            $sql = "SELECT id FROM $tbl_course_lp lp $condition_lp";
            $res_count_lp = Database::query($sql);
            // count the number of learning paths
            $lp_id = array();
            while ($row_lp = Database::fetch_array($res_count_lp,'ASSOC')) {
                //$visibility = api_get_item_visibility($a_course, TOOL_LEARNPATH, $row_lp['id'], $session_id);
                //  if ($visibility == 1) {
                $lp_id[] = $row_lp['id'];
                //}
                }
                $count_lp = count($lp_id);

                $avg_progress = 0;
                //if there is at least one learning path and one student
                if ($count_lp>0 && !empty($student_id)) {
                    $condition_user = "";
                    if (is_array($student_id)) {
                        $$r = array_walk($student_id,'intval');
                        $condition_user = " lp_view.user_id IN (".implode(',',$student_id).") AND ";
                    } else {
                        $student_id = intval($student_id);
                        $condition_user = " lp_view.user_id = '$student_id' AND ";
                    }
                    // Get last view for each student (in case of multi-attempt)
                    // Also filter on LPs of this session
                    $sql_maxes = "SELECT MAX(view_count), progress FROM $tbl_course_lp_view lp_view ".
                             "WHERE $condition_user session_id = $session_id AND lp_view.lp_id IN (".implode(',',$lp_id).") ".
                             "GROUP BY lp_id, user_id";                
                    $res_maxes = Database::query($sql_maxes);
                    $sum =  0;
                    while ($row_maxes = Database::fetch_array($res_maxes)) {
                        $sum += $row_maxes[1];
                    }
                    // average progress = total sum divided by the number of views
                    // summed up.
                    $number_items = count($lp_id);
                    if ($number_items == 0) {
                        return 0; //not necessary to return something else if there is no view
                    }
                    if (!$return_array) {
                        $avg_progress = round($sum / $number_items, 1);
                        return $avg_progress;
                    } else {
                        return array($sum, $number_items);
                    }
                }
            }
            return null;
        }


        /**
         * This function gets:
         * 1. The score average from all SCORM Test items in all LP in a course-> All the answers / All the max scores.
         * 2. The score average from all Tests (quiz) in all LP in a course-> All the answers / All the max scores.
         * 3. And finally it will return the average between 1. and 2.
         * @todo improve performance, when loading 1500 users with 20 lps the script dies
         * This function does not take the results of a Test out of a LP
         *
         * @param   mixed       Array of user ids or an user id
         * @param   string      Course code
         * @param   array       List of LP ids
         * @param   int         Session id (optional), if param $session_id is null(default) it'll return results including sessions, 0 = session is not filtered
         * @param   bool        Returns an array of the type [sum_score, num_score] if set to true
         * @param   bool        get only the latest attempts or ALL attempts
         * @return  string      Value (number %) Which represents a round integer explain in got in 3.
         */
        public static function get_avg_student_score($student_id, $course_code, $lp_ids = array(), $session_id = null, $return_array = false, $get_only_latest_attempt_results = false) {
            $debug = false;
            if ($debug) echo '<h1>get_avg_student_score</h1>';
            // get global tables names
            $course_table               = Database :: get_main_table(TABLE_MAIN_COURSE);
            $course_user_table          = Database :: get_main_table(TABLE_MAIN_COURSE_USER);
            $table_session_course_user  = Database :: get_main_table(TABLE_MAIN_SESSION_COURSE_USER);
            $tbl_stats_exercices        = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
            $tbl_stats_attempts         = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);

            $course = CourseManager :: get_course_information($course_code);

            if (!empty($course['db_name'])) {

                // get course tables names
                $tbl_quiz_questions = Database :: get_course_table(TABLE_QUIZ_QUESTION,$course['db_name']);
                $lp_table           = Database :: get_course_table(TABLE_LP_MAIN,$course['db_name']);
                $lp_item_table      = Database :: get_course_table(TABLE_LP_ITEM,$course['db_name']);
                $lp_view_table      = Database :: get_course_table(TABLE_LP_VIEW,$course['db_name']);
                $lp_item_view_table = Database :: get_course_table(TABLE_LP_ITEM_VIEW,$course['db_name']);

                // Compose a filter based on optional learning paths list given

                $condition_lp = "";
                if (count($lp_ids) > 0) {
                    $condition_lp =" AND id IN(".implode(',',$lp_ids).") ";
                }                

                // Compose a filter based on optional session id
                $condition_session = "";
                
                $session_id = intval($session_id);
                if (count($lp_ids) > 0) {
                    $condition_session = " AND session_id = $session_id ";
                } else {
                    $condition_session = " WHERE session_id = $session_id ";
                }

                // Check the real number of LPs corresponding to the filter in the
                // database (and if no list was given, get them all)

                if (empty($session_id)) {
                    $sql = "SELECT DISTINCT(id), use_max_score FROM $lp_table  WHERE session_id = 0 $condition_lp ";
                } else {
                    $sql = "SELECT DISTINCT(id), use_max_score FROM $lp_table WHERE 1 $condition_lp ";
                }
                
                $res_row_lp   = Database::query($sql);
                $count_row_lp = Database::num_rows($res_row_lp);
                
                $lp_list = $use_max_score = array();
                while ($row_lp = Database::fetch_array($res_row_lp)) {
                    $lp_list[]                     = $row_lp['id'];
                    $use_max_score[$row_lp['id']]  = $row_lp['use_max_score'];
                }     

                if ($debug) var_dump($use_max_score);

                // Init local variables that will be used through the calculation                
                $progress = 0;

                // prepare filter on users
                $condition_user1 = "";
                
                if (is_array($student_id)) {
                    array_walk($student_id,'intval');
                    $condition_user1 =" AND user_id IN (".implode(',',$student_id).") ";
                } else {
                    $condition_user1 =" AND user_id = $student_id ";
                }

                if ($count_row_lp > 0 && !empty($student_id)) {

                    // Getting latest LP result for a student                    
                    //@todo problem when a  course have more than 1500 users
                    $sql = "SELECT MAX(view_count) as vc, id, progress, lp_id, user_id  FROM $lp_view_table
                            WHERE lp_id IN (".implode(',',$lp_list).") $condition_user1 AND session_id = $session_id GROUP BY lp_id, user_id";
                    if ($debug) var_dump($sql);
                    $rs_last_lp_view_id = Database::query($sql);
                    
                    $global_result = 0;
                    
                    if (Database::num_rows($rs_last_lp_view_id) > 0) {
                        // Cycle through each line of the results (grouped by lp_id, user_id)
                        $exe_list = array();
                        while ($row_lp_view = Database::fetch_array($rs_last_lp_view_id)) {
                            $count_items = 0;
                            $lp_partial_total = 0;
                            
                            $list = array();
                            $lp_view_id = $row_lp_view['id'];
                            $progress   = $row_lp_view['progress'];
                            $lp_id      = $row_lp_view['lp_id'];
                            $user_id    = $row_lp_view['user_id'];
                            if ($debug) echo '<h2>'.$lp_id.'</h2>';
                            
                            if ($get_only_latest_attempt_results) {
                            //if (1) {
                                //Getting lp_items done by the user
                                $sql  = "SELECT DISTINCT lp_item_id FROM $lp_item_view_table WHERE lp_view_id = $lp_view_id ORDER BY lp_item_id";
                                $res_lp_item = Database::query($sql);
                                
                                while ($row_lp_item = Database::fetch_array($res_lp_item,'ASSOC')) {
                                    $my_lp_item_id = $row_lp_item['lp_item_id'];
                                    
                                    //Getting the most recent attempt 
                                    $sql = "SELECT lp_iv.id as lp_item_view_id, lp_iv.score as score,lp_i.max_score, lp_iv.max_score as max_score_item_view, lp_i.path, lp_i.item_type, lp_i.id as iid
                                            FROM $lp_item_view_table as lp_iv INNER JOIN $lp_item_table as lp_i ON lp_i.id = lp_iv.lp_item_id AND (lp_i.item_type='sco' OR lp_i.item_type='".TOOL_QUIZ."') 
                                            WHERE lp_item_id = $my_lp_item_id AND lp_view_id = $lp_view_id ORDER BY view_count DESC LIMIT 1";
                                    $res_lp_item_result = Database::query($sql);
                                    
                                    while ($row_max_score = Database::fetch_array($res_lp_item_result,'ASSOC')) {
                                        $list[]= $row_max_score;       
                                    }                                      
                                }
                            } else {
                                // For the currently analysed view, get the score and
                                // max_score of each item if it is a sco or a TOOL_QUIZ
                                $sql_max_score = "SELECT lp_iv.id as lp_item_view_id, lp_iv.score as score,lp_i.max_score, lp_iv.max_score as max_score_item_view, lp_i.path, lp_i.item_type, lp_i.id as iid
                                                  FROM $lp_item_view_table as lp_iv INNER JOIN $lp_item_table as lp_i ON lp_i.id = lp_iv.lp_item_id AND (lp_i.item_type='sco' OR lp_i.item_type='".TOOL_QUIZ."') 
                                                  WHERE lp_view_id = $lp_view_id ";
                                if ($debug) echo $sql_max_score.'<br />';
                
                                $res_max_score = Database::query($sql_max_score);
                               
                                while ($row_max_score = Database::fetch_array($res_max_score,'ASSOC')) {
                                    $list[]= $row_max_score;       
                                }
                            }
                            $count_total_loop = 0;
                            
                            // Go through each scorable element of this view
                           
                            $score_of_scorm_calculate = 0;
                            
                            foreach ($list as $row_max_score) {
                                $max_score              = $row_max_score['max_score'];  //Came from the original lp_item
                                $max_score_item_view    = $row_max_score['max_score_item_view']; //Came from the lp_item_view
                                $score                  = $row_max_score['score'];
                                
                                if ($debug) var_dump($row_max_score['item_type']);
                                
                                if ($row_max_score['item_type'] == 'sco') {
                                    //var_dump($row_max_score);
                                    // Check if it is sco (easier to get max_score)
                                    //when there's no max score, we assume 100 as the max score, as the SCORM 1.2 says that the value should always be between 0 and 100.
                                    if ($max_score == 0 || is_null($max_score) || $max_score == '') {
                                        //Chamilo style
                                        if ($use_max_score[$lp_id]) {
                                            $max_score = 100;
                                        } else {
                                            //Overwrites max score = 100 to use the one that came in the lp_item_view see BT#1613
                                            $max_score = $max_score_item_view;
                                        }
                                    }
                                    //Avoid division by zero errors
                                    if (!empty($max_score)) {
                                        //$lp_partial_total += $score/$max_score;                                                                                
                                    }                      
                                    if ($debug) echo '<b>'.$lp_partial_total.' '.$score.' '.$max_score.'</b><br />';
                                } else {
                                    // Case of a TOOL_QUIZ element
                                    $item_id    = $row_max_score['iid'];
                                    $item_path  = $row_max_score['path'];
                                    $lp_item_view_id  = $row_max_score['lp_item_view_id'];
                                    
                                    // Get last attempt to this exercise  through
                                    // the current lp for the current user
                                    $sql_last_attempt = "SELECT exe_id FROM $tbl_stats_exercices WHERE 
                                            exe_exo_id           = '$item_path' AND 
                                            exe_user_id          = $user_id AND 
                                            orig_lp_item_id      = $item_id AND 
                                            orig_lp_item_view_id = $lp_item_view_id AND 
                                            exe_cours_id         = '$course_code'  AND
                                            session_id           = $session_id 
                                            ORDER BY exe_date DESC LIMIT 1";
                                    if ($debug) echo $sql_last_attempt .'<br />';
                                    $result_last_attempt = Database::query($sql_last_attempt);
                                    $num = Database :: num_rows($result_last_attempt);
                                    if ($num > 0 ) {
                                        $id_last_attempt = Database :: result($result_last_attempt, 0, 0);
                                        if ($debug) echo $id_last_attempt.'<br />';
                                       /* if (in_array($id_last_attempt, $exe_list)) {
                                            continue;
                                        }*/
                                        //$exe_list[] = $id_last_attempt;
                                        //echo $id_last_attempt .'<br />';                                        

                                        // Within the last attempt number tracking, get the sum of
                                        // the max_scores of all questions that it was
                                        // made of (we need to make this call dynamic
                                        // because of random questions selection)
                                        $sql = "SELECT SUM(t.ponderation) as maxscore FROM 
                                                ( SELECT distinct question_id, marks, ponderation FROM $tbl_stats_attempts AS at INNER JOIN  $tbl_quiz_questions AS q ON (q.id = at.question_id) 
                                                  WHERE exe_id ='$id_last_attempt' ) AS t";
                                        $res_max_score_bis = Database::query($sql);
                                        $row_max_score_bis = Database :: fetch_array($res_max_score_bis);
                                        if (!empty($row_max_score_bis['maxscore'])) {
                                            $max_score = $row_max_score_bis['maxscore'];
                                        }
                                        if (!empty($max_score)) {
                                            $lp_partial_total            += $score/$max_score;                                            
                                        }
                                        if ($debug) echo '<b>'.$lp_partial_total.' '.$score.' '.$max_score.'</b><br />';
                                    }
                                }
                                
                                if ($row_max_score['item_type'] == 'quiz') {
                                
                                    // Normal way
                                    if ($use_max_score[$lp_id]) {
                                        $count_items++;
                                    } else {
                                        if ($max_score != '') {
                                            $count_items++;
                                        }
                                    }
                                    if ($debug) echo '$count_items: '.$count_items;
                                }
                                

                            } //end for
                            $score_of_scorm_calculate += $count_items?(($lp_partial_total/$count_items)*100):0;
                             
                            if ($debug) echo '<h3>$score_of_scorm_calculate '.$score_of_scorm_calculate.'</h3>';                            
                           
                            // var_dump($score_of_scorm_calculate);
                            $global_result += $score_of_scorm_calculate;
                            if ($debug) echo '<h3>$$global_result '.$global_result.'</h3>';
                        } // end while                        
                    }

                    $lp_with_quiz = 0;
                    $total_lp = 0;
                    if ($debug) var_dump($lp_list);
                    foreach($lp_list as $lp_id) {
                        //check if LP have a score
                        // OR item_type = 'sco'
                        $sql = "SELECT count(id) as count FROM $lp_item_table WHERE item_type = 'quiz' AND lp_id = ".$lp_id;
                        if ($debug) echo $sql;
                        $result_have_quiz = Database::query($sql);

                        if (Database::num_rows($result_have_quiz) > 0 ) {
                            $row = Database::fetch_array($result_have_quiz,'ASSOC');
                            if (is_numeric($row['count']) && $row['count'] != 0) {
                                $lp_with_quiz ++;
                            }
                        }
                        $total_lp ++;
                    }
                    if ($debug) var_dump($lp_with_quiz);
                    
                    if ($lp_with_quiz != 0 ) {                        
                        if (!$return_array) {
                            //var_dump($global_result,$lp_with_quiz );
                            $score_of_scorm_calculate = round(($global_result/$lp_with_quiz),2);
                            //var_dump($global_result, $lp_with_quiz);
                            return $score_of_scorm_calculate;
                        } else {
                            if ($debug) var_dump($global_result, $lp_with_quiz);
                            return array($global_result, $lp_with_quiz);
                        }
                    } else {
                        return '-';
                    }
                }
            }
            return null;
        }


        /**
         * This function gets time spent in learning path for a student inside a course
         * @param     int|array    Student id(s)
         * @param     string         Course code
         * @param     array         Limit average to listed lp ids
         * @param     int            Session id (optional), if param $session_id is null(default) it'll return results including sessions, 0 = session is not filtered
         * @return     int         Total time
         */
        public static function get_time_spent_in_lp($student_id, $course_code, $lp_ids = array(), $session_id = null) {

            $course = CourseManager :: get_course_information($course_code);
            $student_id = intval($student_id);
            $total_time = 0;

            if (!empty($course['db_name'])) {

                $lp_table   = Database :: get_course_table(TABLE_LP_MAIN, $course['db_name']);
                $t_lpv         = Database :: get_course_table(TABLE_LP_VIEW, $course['db_name']);
                $t_lpiv     = Database :: get_course_table(TABLE_LP_ITEM_VIEW, $course['db_name']);

                // Compose a filter based on optional learning paths list given
                $condition_lp = "";
                if(count($lp_ids) > 0) {
                    $condition_lp =" WHERE id IN(".implode(',',$lp_ids).") ";
                }

                // Compose a filter based on optional session id
                $condition_session = "";
                $session_id = intval($session_id);

                if (isset($session_id)) {
                    if (count($lp_ids) > 0) {
                        $condition_session = " AND session_id = $session_id ";
                    } else {
                        $condition_session = " WHERE session_id = $session_id ";
                    }
                }

                // Check the real number of LPs corresponding to the filter in the
                // database (and if no list was given, get them all)
                //$res_row_lp = Database::query("SELECT DISTINCT(id) FROM $lp_table $condition_lp $condition_session");
                $res_row_lp = Database::query("SELECT DISTINCT(id) FROM $lp_table $condition_lp");
                $count_row_lp = Database::num_rows($res_row_lp);

                // calculates time
                if ($count_row_lp > 0) {
                    while ($row_lp = Database::fetch_array($res_row_lp)) {
                        $lp_id = intval($row_lp['id']);
                        $sql = 'SELECT SUM(total_time)
                            FROM '.$t_lpiv.' AS item_view
                            INNER JOIN '.$t_lpv.' AS view
                                ON item_view.lp_view_id = view.id
                                AND view.lp_id = '.$lp_id.'
                                AND view.user_id = '.$student_id.' AND session_id = '.$session_id;

                        $rs = Database::query($sql);
                        if (Database :: num_rows($rs) > 0) {
                            $total_time += Database :: result($rs, 0, 0);
                        }
                    }
                }
            }
            return $total_time;
        }

        /**
         * This function gets last connection time to one learning path
         * @param     int|array    Student id(s)
         * @param     string         Course code
         * @param     int         Learning path id
         * @return     int         Total time
         */
        public static function get_last_connection_time_in_lp($student_id, $course_code, $lp_id, $session_id = 0) {
            $course = CourseManager :: get_course_information($course_code);
            $student_id = intval($student_id);
            $lp_id = intval($lp_id);
            $last_time = 0;
            $session_id = intval($session_id);

            if (!empty($course['db_name'])) {

                $lp_table    = Database :: get_course_table(TABLE_LP_MAIN, $course['db_name']);
                $t_lpv       = Database :: get_course_table(TABLE_LP_VIEW, $course['db_name']);
                $t_lpiv      = Database :: get_course_table(TABLE_LP_ITEM_VIEW, $course['db_name']);

                // Check the real number of LPs corresponding to the filter in the
                // database (and if no list was given, get them all)
                $res_row_lp = Database::query("SELECT id FROM $lp_table WHERE id = $lp_id ");
                $count_row_lp = Database::num_rows($res_row_lp);

                // calculates last connection time
                if ($count_row_lp > 0) {
                    $sql = 'SELECT MAX(start_time)
                        FROM ' . $t_lpiv . ' AS item_view
                        INNER JOIN ' . $t_lpv . ' AS view
                            ON item_view.lp_view_id = view.id
                            AND view.lp_id = '.$lp_id.'
                            AND view.user_id = '.$student_id.' 
                            AND view.session_id = '.$session_id;
                    $rs = Database::query($sql);
                    if (Database :: num_rows($rs) > 0) {
                        $last_time = Database :: result($rs, 0, 0);
                    }
                }
            }
            return $last_time;
        }

        /**
         * gets the list of students followed by coach
         * @param     int     Coach id
         * @return     array     List of students
         */
        public static function get_student_followed_by_coach($coach_id) {
            $coach_id = intval($coach_id);

            $tbl_session_course_user = Database :: get_main_table(TABLE_MAIN_SESSION_COURSE_USER);
            $tbl_session_course = Database :: get_main_table(TABLE_MAIN_SESSION_COURSE);
            $tbl_session_user = Database :: get_main_table(TABLE_MAIN_SESSION_USER);
            $tbl_session = Database :: get_main_table(TABLE_MAIN_SESSION);

            $a_students = array ();

            // At first, courses where $coach_id is coach of the course //
            $sql = 'SELECT id_session, course_code FROM ' . $tbl_session_course_user . ' WHERE id_user=' . $coach_id.' AND status=2';

            global $_configuration;
            if ($_configuration['multiple_access_urls']) {
                $tbl_session_rel_access_url= Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_SESSION);
                $access_url_id = api_get_current_access_url_id();
                if ($access_url_id != -1) {
                    $sql = 'SELECT scu.id_session, scu.course_code
                        FROM ' . $tbl_session_course_user . ' scu INNER JOIN '.$tbl_session_rel_access_url.'  sru
                        ON (scu.id_session=sru.session_id)
                        WHERE scu.id_user=' . $coach_id.' AND scu.status=2 AND sru.access_url_id = '.$access_url_id;
                }
            }

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

            while ($a_courses = Database::fetch_array($result)) {

                $course_code = $a_courses["course_code"];
                $id_session = $a_courses["id_session"];

                $sql = "SELECT distinct    srcru.id_user
                                FROM $tbl_session_course_user AS srcru, $tbl_session_user sru
                                WHERE srcru.id_user = sru.id_user AND sru.relation_type<>".SESSION_RELATION_TYPE_RRHH." AND srcru.id_session = sru.id_session AND srcru.course_code='$course_code' AND srcru.id_session='$id_session'";

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

                while ($row = Database::fetch_array($rs)) {
                    $a_students[$row['id_user']] = $row['id_user'];
                }
            }

            // Then, courses where $coach_id is coach of the session    //

            $sql = 'SELECT session_course_user.id_user
                        FROM ' . $tbl_session_course_user . ' as session_course_user
                        INNER JOIN     '.$tbl_session_user.' sru ON session_course_user.id_user = sru.id_user AND session_course_user.id_session = sru.id_session
                        INNER JOIN ' . $tbl_session_course . ' as session_course
                            ON session_course.course_code = session_course_user.course_code
                            AND session_course_user.id_session = session_course.id_session
                        INNER JOIN ' . $tbl_session . ' as session
                            ON session.id = session_course.id_session
                            AND session.id_coach = ' . $coach_id;
            if ($_configuration['multiple_access_urls']) {
                $tbl_session_rel_access_url= Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_SESSION);
                $access_url_id = api_get_current_access_url_id();
                if ($access_url_id != -1){
                    $sql = 'SELECT session_course_user.id_user
                FROM ' . $tbl_session_course_user . ' as session_course_user
                INNER JOIN     '.$tbl_session_user.' sru ON session_course_user.id_user = sru.id_user AND session_course_user.id_session = sru.id_session
                INNER JOIN ' . $tbl_session_course . ' as session_course
                    ON session_course.course_code = session_course_user.course_code
                    AND session_course_user.id_session = session_course.id_session
                INNER JOIN ' . $tbl_session . ' as session
                    ON session.id = session_course.id_session
                    AND session.id_coach = ' . $coach_id.'
                INNER JOIN '.$tbl_session_rel_access_url.'  session_rel_url
                    ON session.id = session_rel_url.session_id WHERE access_url_id = '.$access_url_id;
                }
            }

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

            while ($row = Database::fetch_array($result)) {
                $a_students[$row['id_user']] = $row['id_user'];
            }
            return $a_students;
        }

        /**
         * Get student followed by a coach inside a session
         * @param    int        Session id
         * @param    int        Coach id
         * @return     array    students list
         */
        public static function get_student_followed_by_coach_in_a_session($id_session, $coach_id) {

            $coach_id = intval($coach_id);

            $tbl_session_course_user = Database :: get_main_table(TABLE_MAIN_SESSION_COURSE_USER);
            $tbl_session_course = Database :: get_main_table(TABLE_MAIN_SESSION_COURSE);
            $tbl_session = Database :: get_main_table(TABLE_MAIN_SESSION);

            $a_students = array ();

            //////////////////////////////////////////////////////////////
            // At first, courses where $coach_id is coach of the course //
            //////////////////////////////////////////////////////////////
            $sql = 'SELECT course_code FROM ' . $tbl_session_course_user . ' WHERE id_session="' . $id_session . '" AND id_user=' . $coach_id.' AND status=2';

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

            while ($a_courses = Database::fetch_array($result)) {
                $course_code = $a_courses["course_code"];

                $sql = "SELECT distinct    srcru.id_user
                                FROM $tbl_session_course_user AS srcru
                                WHERE course_code='$course_code' and id_session = '" . $id_session . "'";

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

                while ($row = Database::fetch_array($rs)) {
                    $a_students[$row['id_user']] = $row['id_user'];
                }
            }

            //////////////////////////////////////////////////////////////
            // Then, courses where $coach_id is coach of the session    //
            //////////////////////////////////////////////////////////////

            $dsl_session_coach = 'SELECT id_coach FROM ' . $tbl_session . ' WHERE id="' . $id_session . '" AND id_coach="' . $coach_id . '"';
            $result = Database::query($dsl_session_coach);
            //He is the session_coach so we select all the users in the session
            if (Database::num_rows($result) > 0) {
                $sql = 'SELECT DISTINCT srcru.id_user FROM ' . $tbl_session_course_user . ' AS srcru WHERE id_session="' . $id_session . '"';
                $result = Database::query($sql);
                while ($row = Database::fetch_array($result)) {
                    $a_students[$row['id_user']] = $row['id_user'];
                }
            }
            return $a_students;
        }

        /**
         * Check if a coach is allowed to follow a student
         * @param    int        Coach id
         * @param    int        Student id
         * @return    bool
         */
        public static function is_allowed_to_coach_student($coach_id, $student_id) {
            $coach_id = intval($coach_id);
            $student_id = intval($student_id);

            $tbl_session_course_user = Database :: get_main_table(TABLE_MAIN_SESSION_COURSE_USER);
            $tbl_session_course = Database :: get_main_table(TABLE_MAIN_SESSION_COURSE);
            $tbl_session = Database :: get_main_table(TABLE_MAIN_SESSION);

            //////////////////////////////////////////////////////////////
            // At first, courses where $coach_id is coach of the course //
            //////////////////////////////////////////////////////////////
            /*$sql = 'SELECT 1
            FROM ' . $tbl_session_course_user . ' AS session_course_user
            INNER JOIN ' . $tbl_session_course . ' AS session_course
            ON session_course.course_code = session_course_user.course_code
            AND id_coach=' . $coach_id . '
            WHERE id_user=' . $student_id;*/

            $sql = 'SELECT 1 FROM ' . $tbl_session_course_user . ' WHERE id_user=' . $coach_id .' AND status=2';

            $result = Database::query($sql);
            if (Database::num_rows($result) > 0) {
                return true;
            }

            //////////////////////////////////////////////////////////////
            // Then, courses where $coach_id is coach of the session    //
            //////////////////////////////////////////////////////////////

            $sql = 'SELECT session_course_user.id_user
                        FROM ' . $tbl_session_course_user . ' as session_course_user
                        INNER JOIN ' . $tbl_session_course . ' as session_course
                            ON session_course.course_code = session_course_user.course_code
                        INNER JOIN ' . $tbl_session . ' as session
                            ON session.id = session_course.id_session
                            AND session.id_coach = ' . $coach_id . '
                        WHERE id_user = ' . $student_id;
            $result = Database::query($sql);
            if (Database::num_rows($result) > 0) {
                return true;
            }

            return false;

        }


        /**
         * Get courses followed by coach
         * @param     int        Coach id
         * @param    int        Session id (optional)
         * @return    array    Courses list
         */
        public static function get_courses_followed_by_coach($coach_id, $id_session = '')
        {

            $coach_id = intval($coach_id);
            if (!empty ($id_session))
            $id_session = intval($id_session);

            $tbl_session_course_user = Database :: get_main_table(TABLE_MAIN_SESSION_COURSE_USER);
            $tbl_session_course = Database :: get_main_table(TABLE_MAIN_SESSION_COURSE);
            $tbl_session = Database :: get_main_table(TABLE_MAIN_SESSION);
            $tbl_course = Database :: get_main_table(TABLE_MAIN_COURSE);

            //////////////////////////////////////////////////////////////
            // At first, courses where $coach_id is coach of the course //
            //////////////////////////////////////////////////////////////
            $sql = 'SELECT DISTINCT course_code FROM ' . $tbl_session_course_user . ' WHERE id_user=' . $coach_id.' AND status=2';

            global $_configuration;
            if ($_configuration['multiple_access_urls']) {
                $tbl_course_rel_access_url= Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_COURSE);
                $access_url_id = api_get_current_access_url_id();
                if ($access_url_id != -1){
                    $sql = 'SELECT DISTINCT scu.course_code FROM ' . $tbl_session_course_user . ' scu INNER JOIN '.$tbl_course_rel_access_url.' cru
                        ON (scu.course_code = cru.course_code)
                        WHERE scu.id_user=' . $coach_id.' AND scu.status=2 AND cru.access_url_id = '.$access_url_id;
                }
            }

            if (!empty ($id_session))
            $sql .= ' AND id_session=' . $id_session;
            $result = Database::query($sql);
            while ($row = Database::fetch_array($result)) {
                $a_courses[$row['course_code']] = $row['course_code'];
            }

            //////////////////////////////////////////////////////////////
            // Then, courses where $coach_id is coach of the session    //
            //////////////////////////////////////////////////////////////
            $sql = 'SELECT DISTINCT session_course.course_code
                        FROM ' . $tbl_session_course . ' as session_course
                        INNER JOIN ' . $tbl_session . ' as session
                            ON session.id = session_course.id_session
                            AND session.id_coach = ' . $coach_id . '
                        INNER JOIN ' . $tbl_course . ' as course
                            ON course.code = session_course.course_code';

            if ($_configuration['multiple_access_urls']) {
                $tbl_course_rel_access_url= Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_COURSE);
                $access_url_id = api_get_current_access_url_id();
                if ($access_url_id != -1){
                    $sql = 'SELECT DISTINCT session_course.course_code
                        FROM ' . $tbl_session_course . ' as session_course
                        INNER JOIN ' . $tbl_session . ' as session
                            ON session.id = session_course.id_session
                            AND session.id_coach = ' . $coach_id . '
                        INNER JOIN ' . $tbl_course . ' as course
                            ON course.code = session_course.course_code
                         INNER JOIN '.$tbl_course_rel_access_url.' course_rel_url
                        ON (session_course.course_code = course_rel_url.course_code)';
                }
            }

            if (!empty ($id_session)) {
                $sql .= ' WHERE session_course.id_session=' . $id_session;
                if ($_configuration['multiple_access_urls'])
                $sql .=  ' AND access_url_id = '.$access_url_id;
            }  else {
                if ($_configuration['multiple_access_urls'])
                $sql .=  ' WHERE access_url_id = '.$access_url_id;
            }

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

            while ($row = Database::fetch_array($result)) {
                $a_courses[$row['course_code']] = $row['course_code'];
            }

            return $a_courses;
        }

        /**
         * Get sessions coached by user
         * @param    int        Coach id
         * @return    array    Sessions list
         */
        public static function get_sessions_coached_by_user($coach_id) {
            // table definition
            $tbl_session = Database :: get_main_table(TABLE_MAIN_SESSION);
            $tbl_session_course = Database :: get_main_table(TABLE_MAIN_SESSION_COURSE);
            $tbl_session_course_user = Database :: get_main_table(TABLE_MAIN_SESSION_COURSE_USER);

            // protect datas
            $coach_id = intval($coach_id);

            // session where we are general coach
            $sql = 'SELECT DISTINCT id, name, date_start, date_end
                        FROM ' . $tbl_session . '
                        WHERE id_coach=' . $coach_id;

            global $_configuration;
            if ($_configuration['multiple_access_urls']) {
                $tbl_session_rel_access_url= Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_SESSION);
                $access_url_id = api_get_current_access_url_id();
                if ($access_url_id != -1){
                    $sql = 'SELECT DISTINCT id, name, date_start, date_end
                        FROM ' . $tbl_session . ' session INNER JOIN '.$tbl_session_rel_access_url.' session_rel_url
                        ON (session.id = session_rel_url.session_id)
                        WHERE id_coach=' . $coach_id.' AND access_url_id = '.$access_url_id;
                }
            }

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

            while ($row = Database::fetch_array($rs))
            {
                $a_sessions[$row["id"]] = $row;
            }

            // session where we are coach of a course
            $sql = 'SELECT DISTINCT session.id, session.name, session.date_start, session.date_end
                        FROM ' . $tbl_session . ' as session
                        INNER JOIN ' . $tbl_session_course_user . ' as session_course_user
                            ON session.id = session_course_user.id_session
                            AND session_course_user.id_user=' . $coach_id.' AND session_course_user.status=2';

            global $_configuration;
            if ($_configuration['multiple_access_urls']) {
                $tbl_session_rel_access_url= Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_SESSION);
                $access_url_id = api_get_current_access_url_id();
                if ($access_url_id != -1){
                    $sql = 'SELECT DISTINCT session.id, session.name, session.date_start, session.date_end
                        FROM ' . $tbl_session . ' as session
                        INNER JOIN ' . $tbl_session_course_user . ' as session_course_user
                            ON session.id = session_course_user.id_session AND session_course_user.id_user=' . $coach_id.' AND session_course_user.status=2
                        INNER JOIN '.$tbl_session_rel_access_url.' session_rel_url
                        ON (session.id = session_rel_url.session_id)
                        WHERE access_url_id = '.$access_url_id;
                }
            }

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

            while ($row = Database::fetch_array($rs))
            {
                $a_sessions[$row["id"]] = $row;
            }

            if (is_array($a_sessions)) {
                foreach ($a_sessions as & $session) {
                    if ($session['date_start'] == '0000-00-00') {
                        $session['status'] = get_lang('SessionActive');
                    }
                    else {
                        $date_start = explode('-', $session['date_start']);
                        $time_start = mktime(0, 0, 0, $date_start[1], $date_start[2], $date_start[0]);
                        $date_end = explode('-', $session['date_end']);
                        $time_end = mktime(0, 0, 0, $date_end[1], $date_end[2], $date_end[0]);
                        if ($time_start < time() && time() < $time_end) {
                            $session['status'] = get_lang('SessionActive');
                        }
                        else{
                            if (time() < $time_start) {
                                $session['status'] = get_lang('SessionFuture');
                            }
                            else{
                                if (time() > $time_end) {
                                    $session['status'] = get_lang('SessionPast');
                                }
                            }
                        }
                    }
                }
            }
            return $a_sessions;

        }

        /**
         * Get courses list from a session
         * @param    int        Session id
         * @return    array    Courses list
         */
        public static function get_courses_list_from_session($session_id) {
            //protect datas
            $session_id = intval($session_id);

            // table definition
            $tbl_session = Database :: get_main_table(TABLE_MAIN_SESSION);
            $tbl_session_course = Database :: get_main_table(TABLE_MAIN_SESSION_COURSE);

            $sql = 'SELECT DISTINCT course_code
                        FROM ' . $tbl_session_course . '
                        WHERE id_session=' . $session_id;

            $rs = Database::query($sql);
            $a_courses = array ();
            while ($row = Database::fetch_array($rs)) {
                $a_courses[$row['course_code']] = $row;
            }
            return $a_courses;
        }


        /**
         * Count assignments per student
         * @param    int|array   Student id(s)
         * @param    string        Course code
         * @param    int            Session id (optional), if param $session_id is null(default) return count of assignments including sessions, 0 = session is not filtered
         * @return    int            Count of assignments
         */
        public static function count_student_assignments($student_id, $course_code, $session_id = null) {
            require_once (api_get_path(LIBRARY_PATH) . 'course.lib.php');

            // protect datas
            $course_code = Database::escape_string($course_code);
            // get the informations of the course
            $a_course = CourseManager :: get_course_information($course_code);
            if (!empty($a_course['db_name'])) {
                // table definition
                $tbl_item_property          = Database :: get_course_table(TABLE_ITEM_PROPERTY, $a_course['db_name']);
                $tbl_student_publication = Database :: get_course_table(TABLE_STUDENT_PUBLICATION, $a_course['db_name']);

                $condition_user = "";
                if (is_array($student_id)) {
                    $condition_user = " AND ip.insert_user_id IN (".implode(',',$student_id).") ";
                } else {
                    $condition_user = " AND ip.insert_user_id = '$student_id' ";
                }

                $condition_session = "";
                if (isset($session_id)) {
                    $session_id = intval($session_id);
                    $condition_session = " AND pub.session_id = $session_id ";
                }

                $sql = "SELECT count(ip.tool) FROM $tbl_item_property ip INNER JOIN $tbl_student_publication pub ON ip.ref = pub.id WHERE ip.tool='work' $condition_user $condition_session ";
                $rs = Database::query($sql);
                $row = Database::fetch_row($rs);
                return $row[0];
            }
            return null;
        }


        /**
         * Count messages per student inside forum tool
         * @param    int        Student id
         * @param    string    Course code
         * @param    int        Session id (optional), if param $session_id is null(default) return count of messages including sessions, 0 = session is not filtered
         * @return    int        Count of messages
         */
        function count_student_messages($student_id, $course_code, $session_id = null) {
            require_once (api_get_path(LIBRARY_PATH) . 'course.lib.php');

            // protect datas
            $student_id = intval($student_id);
            $course_code = addslashes($course_code);

            // get the informations of the course
            $a_course = CourseManager :: get_course_information($course_code);

            if(!empty($a_course['db_name']))
            {
                // table definition
                $tbl_forum_post = Database :: get_course_table(TABLE_FORUM_POST, $a_course['db_name']);
                $tbl_forum         = Database :: get_course_table(TABLE_FORUM, $a_course['db_name']);

                $condition_user = "";
                if (is_array($student_id)) {
                    $condition_user = " WHERE post.poster_id IN (".implode(',',$student_id).") ";
                } else {
                    $condition_user = " WHERE post.poster_id = '$student_id' ";
                }

                $condition_session = "";
                if (isset($session_id)) {
                    $session_id = intval($session_id);
                    $condition_session = " AND forum.session_id = $session_id";
                }

                $sql = "SELECT 1 FROM $tbl_forum_post post INNER JOIN $tbl_forum forum ON forum.forum_id = post.forum_id $condition_user $condition_session ";
                $rs = Database::query($sql);
                return Database::num_rows($rs);
            }
            else
            {
                return null;
            }
        }

        /**
         * This function counts the number of post by course
         * @param      string     Course code
         * @param    int        Session id (optional), if param $session_id is null(default) it'll return results including sessions, 0 = session is not filtered
         * @return    int     The number of post by course
         */
        public static function count_number_of_posts_by_course($course_code, $session_id = null) {
            //protect data
            $course_code = Database::escape_string($course_code);
            // get the informations of the course
            $a_course = CourseManager :: get_course_information($course_code);
            $count = 0;
            if (!empty($a_course['db_name'])) {
                $tbl_posts = Database :: get_course_table(TABLE_FORUM_POST, $a_course['db_name']);
                $tbl_forums = Database :: get_course_table(TABLE_FORUM, $a_course['db_name']);
                $condition_session = '';
                if (isset($session_id)) {
                    $session_id = intval($session_id);
                    $condition_session = ' WHERE f.session_id = '. $session_id;
                }
                $sql = "SELECT count(*) FROM $tbl_posts p INNER JOIN $tbl_forums f ON f.forum_id = p.forum_id $condition_session ";
                $result = Database::query($sql);
                $row = Database::fetch_row($result);
                $count = $row[0];
                return $count;
            } else {
                return null;
            }
        }

        /**
         * This function counts the number of threads by course
         * @param      string     Course code
         * @param    int        Session id (optional), if param $session_id is null(default) it'll return results including sessions, 0 = session is not filtered
         * @return    int     The number of threads by course
         */
        public static function count_number_of_threads_by_course($course_code, $session_id = null) {
            //protect data
            $course_code = Database::escape_string($course_code);
            // get the informations of the course
            $a_course = CourseManager :: get_course_information($course_code);
            $count = 0;
            if (!empty($a_course['db_name'])) {
                $tbl_threads = Database :: get_course_table(TABLE_FORUM_THREAD, $a_course['db_name']);
                $tbl_forums = Database :: get_course_table(TABLE_FORUM, $a_course['db_name']);
                $condition_session = '';
                if (isset($session_id)) {
                    $session_id = intval($session_id);
                    $condition_session = ' WHERE f.session_id = '. $session_id;
                }
                $sql = "SELECT count(*) FROM $tbl_threads t INNER JOIN $tbl_forums f ON f.forum_id = t.forum_id $condition_session ";
                $result = Database::query($sql);
                $row = Database::fetch_row($result);
                $count = $row[0];
                return $count;
            } else {
                return null;
            }
        }

        /**
         * This function counts the number of forums by course
         * @param      string     Course code
         * @param    int        Session id (optional), if param $session_id is null(default) it'll return results including sessions, 0 = session is not filtered
         * @return    int     The number of forums by course
         */
        public static function count_number_of_forums_by_course($course_code, $session_id = null) {
            //protect data
            $course_code = addslashes($course_code);
            // get the informations of the course
            $a_course = CourseManager :: get_course_information($course_code);
            $count = 0;
            if (!empty($a_course['db_name'])) {

                $condition_session = '';
                if (isset($session_id)) {
                    $session_id = intval($session_id);
                    $condition_session = ' WHERE session_id = '. $session_id;
                }

                $tbl_forums = Database :: get_course_table(TABLE_FORUM, $a_course['db_name']);
                $sql = "SELECT count(*) FROM $tbl_forums $condition_session";
                $result = Database::query($sql);
                $row = Database::fetch_row($result);
                $count = $row[0];
                return $count;
            } else {
                return null;
            }
        }

        /**
         * This function counts the chat last connections by course in x days
         * @param      string     Course code
         * @param      int     Last x days
         * @param    int        Session id (optional)
         * @return     int     Chat last connections by course in x days
         */
        public static function chat_connections_during_last_x_days_by_course($course_code,$last_days, $session_id = 0) {
            //protect data
            $last_days   = intval($last_days);
            $course_code = Database::escape_string($course_code);
            $session_id  = intval($session_id);
            // get the informations of the course
            $a_course = CourseManager :: get_course_information($course_code);
            $count = 0;
            if (!empty($a_course['db_name'])) {
                $tbl_stats_access = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_ACCESS, $a_course['db_name']);

                $sql = "SELECT count(*) FROM $tbl_stats_access WHERE DATE_SUB(NOW(),INTERVAL $last_days DAY) <= access_date
                    AND access_cours_code = '$course_code' AND access_tool='".TOOL_CHAT."' AND access_session_id='$session_id' ";
                $result = Database::query($sql);
                $row = Database::fetch_row($result);
                $count = $row[0];
                return $count;
            } else {
                return null;
            }
        }

        /**
         * This function gets the last student's connection in chat
         * @param      int     Student id
         * @param      string     Course code
         * @param    int        Session id (optional)
         * @return     string    datetime formatted without day (e.g: February 23, 2010 10:20:50 )
         */
        public static function chat_last_connection($student_id, $course_code, $session_id = 0) {

            //protect datas
            $student_id = intval($student_id);
            $course_code= Database::escape_string($course_code);
            $session_id    = intval($session_id);
            $date_time  = '';

            // table definition
            $tbl_stats_access = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_LASTACCESS);
            $sql = "SELECT access_date FROM $tbl_stats_access
                 WHERE access_tool='".TOOL_CHAT."' AND access_user_id='$student_id' AND access_cours_code = '$course_code' AND access_session_id = '$session_id' ORDER BY access_date DESC limit 1";
            $rs = Database::query($sql);
            if (Database::num_rows($rs) > 0) {
                $row = Database::fetch_array($rs);
                $date_time = api_convert_and_format_date($row['access_date'], null, date_default_timezone_get());
            }
            return $date_time;
        }

        /**
         * Get count student's visited links
         * @param    int        Student id
         * @param    string    Course code
         * @param    int        Session id (optional)
         * @return    int        count of visited links
         */
        public static function count_student_visited_links($student_id, $course_code, $session_id = 0) {

            // protect datas
            $student_id  = intval($student_id);
            $course_code = Database::escape_string($course_code);
            $session_id  = intval($session_id);

            // table definition
            $tbl_stats_links = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_LINKS);

            $sql = 'SELECT 1
                        FROM '.$tbl_stats_links.'
                        WHERE links_user_id= '.$student_id.'
                        AND links_cours_id = "'.$course_code.'"
                        AND links_session_id = '.$session_id.' ';

            $rs = Database::query($sql);
            return Database::num_rows($rs);
        }

        /**
         * Get count student downloaded documents
         * @param    int        Student id
         * @param    string    Course code
         * @param    int        Session id (optional)
         * @return    int        Count downloaded documents
         */
        public static function count_student_downloaded_documents($student_id, $course_code, $session_id = 0) {
            // protect datas
            $student_id  = intval($student_id);
            $course_code = Database::escape_string($course_code);
            $session_id  = intval($session_id);

            // table definition
            $tbl_stats_documents = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_DOWNLOADS);

            $sql = 'SELECT 1
                        FROM ' . $tbl_stats_documents . '
                        WHERE down_user_id = '.$student_id.'
                        AND down_cours_id  = "'.$course_code.'"
                        AND down_session_id = '.$session_id.' ';
            $rs = Database::query($sql);
            return Database::num_rows($rs);
        }

        /**
         * Get course list inside a session from a student
         * @param    int        Student id
         * @param    int        Session id (optional)
         * @return    array    Courses list
         */
        public static function get_course_list_in_session_from_student($user_id, $id_session = 0) {
            $user_id = intval($user_id);
            $id_session = intval($id_session);
            $tbl_session_course_user = Database :: get_main_table(TABLE_MAIN_SESSION_COURSE_USER);
            $sql = 'SELECT course_code FROM ' . $tbl_session_course_user . ' WHERE id_user="' . $user_id . '" AND id_session="' . $id_session . '"';
            $result = Database::query($sql);
            $a_courses = array ();
            while ($row = Database::fetch_array($result)) {
                $a_courses[$row['course_code']] = $row['course_code'];
            }
            return $a_courses;
        }

        /**
         * Get inactives students in course
         * @param    string    Course code
         * @param    string    Since login course date (optional, default = 'never')
         * @param    int        Session id    (optional)
         * @return    array    Inactives users
         */
        public static function get_inactives_students_in_course($course_code, $since = 'never', $session_id=0) {
            $tbl_track_login = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_COURSE_ACCESS);
            $tbl_session_course_user = Database :: get_main_table(TABLE_MAIN_SESSION_COURSE_USER);
            $table_course_rel_user            = Database :: get_main_table(TABLE_MAIN_COURSE_USER);
            $inner = '';
            if($session_id!=0)
            {
                $inner = ' INNER JOIN '.$tbl_session_course_user.' session_course_user
                        ON stats_login.course_code = session_course_user.course_code
                        AND session_course_user.id_session = '.intval($session_id).'
                        AND session_course_user.id_user = stats_login.user_id ';
            }
            $sql = 'SELECT user_id, MAX(login_course_date) max_date FROM'.$tbl_track_login.' stats_login'.$inner.'
                GROUP BY user_id
                HAVING DATE_SUB( NOW(), INTERVAL '.$since.' DAY) > max_date ';
            //HAVING DATE_ADD(max_date, INTERVAL '.$since.' DAY) < NOW() ';

            if ($since == 'never') {
                $sql = 'SELECT course_user.user_id FROM '.$table_course_rel_user.' course_user
                        LEFT JOIN '. $tbl_track_login.' stats_login
                        ON course_user.user_id = stats_login.user_id AND relation_type<>'.COURSE_RELATION_TYPE_RRHH.' '.
                $inner.'
                    WHERE course_user.course_code = \''.Database::escape_string($course_code).'\'
                    AND stats_login.login_course_date IS NULL
                    GROUP BY course_user.user_id';
            }
            $rs = Database::query($sql);
            $inactive_users = array();
            while($user = Database::fetch_array($rs))
            {
                $inactive_users[] = $user['user_id'];
            }
            return $inactive_users;
        }

        /**
         * Get count login per student
         * @param    int        Student id
         * @param    string    Course code
         * @param    int        Session id (optional)
         * @return    int        count login
         */
        public static function count_login_per_student($student_id, $course_code, $session_id = 0) {
            $student_id  = intval($student_id);
            $course_code = Database::escape_string($course_code);
            $session_id  = intval($session_id);
            $tbl_course_rel_user = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_ACCESS);

            $sql = 'SELECT '.$student_id.'
        FROM ' . $tbl_course_rel_user . '
        WHERE access_user_id=' . $student_id . '
        AND access_cours_code="' . $course_code . '" AND access_session_id = "'.$session_id.'" ';

            $rs = Database::query($sql);
            $nb_login = Database::num_rows($rs);

            return $nb_login;
        }


        /**
         * Get students followed by a human resources manager
         * @param    int        Drh id
         * @return    array    Student list
         */
        public static function get_student_followed_by_drh($hr_dept_id) {

            $hr_dept_id = intval($hr_dept_id);
            $a_students = array ();

            $tbl_organism = Database :: get_main_table(TABLE_MAIN_ORGANISM);
            $tbl_user = Database :: get_main_table(TABLE_MAIN_USER);

            $sql = 'SELECT DISTINCT user_id FROM '.$tbl_user.' as user
                WHERE hr_dept_id='.$hr_dept_id;
            $rs = Database::query($sql);

            while($user = Database :: fetch_array($rs))
            {
                $a_students[$user['user_id']] = $user['user_id'];
            }

            return $a_students;
        }

        /**
         * Gets the average of test and scorm inside a learning path
         * @param    int     User id
         * @param     string     Course id
         * @return    float    average of test
         * @author     isaac flores paz <florespaz@bidsoftperu.com>
         * @deprecated get_avg_student_score should be use
         */
        public static function get_average_test_scorm_and_lp ($user_id,$course_id) {

            //the score inside the Reporting table
            $course_info    = api_get_course_info($course_id);
            $lp_table         = Database :: get_course_table(TABLE_LP_MAIN,$course_info['dbName']);
            $lp_view_table    = Database  :: get_course_table(TABLE_LP_VIEW,$course_info['dbName']);
            $lp_item_view_table = Database  :: get_course_table(TABLE_LP_ITEM_VIEW,$course_info['dbName']);
            $lp_item_table = Database  :: get_course_table(TABLE_LP_ITEM,$course_info['dbName']);
            $sql_type='SELECT id, lp_type FROM '.$lp_table;
            $rs_type=Database::query($sql_type);
            $average_data=0;
            $count_loop=0;
            $lp_list = array();
            while ($row_type=Database::fetch_array($rs_type)) {
                $lp_list[] = $row_type['id'];
                if ($row_type['lp_type']==1) {
                    //lp chamilo

                    $sql = "SELECT id FROM $lp_view_table  WHERE user_id = '".intval($user_id)."' and lp_id='".$row_type['id']."'";
                    $rs_last_lp_view_id = Database::query($sql);
                    $lp_view_id = intval(Database::result($rs_last_lp_view_id,0,'id'));

                    $sql_list_view='SELECT li.max_score,lv.user_id,liw.score,(liw.score/li.max_score) as sum_data FROM '.$lp_item_table.' li INNER JOIN '.$lp_view_table.' lv
                    ON li.lp_id=lv.lp_id INNER JOIN '.$lp_item_view_table.' liw ON liw.lp_item_id=li.id WHERE lv.user_id="'.$user_id.'" AND li.item_type="quiz" AND liw.lp_view_id="'.$lp_view_id.'"';
                    $sum=0;
                    $tot=0;
                    $rs_list_view1=Database::query($sql_list_view);
                    while ($row_list_view=Database::fetch_array($rs_list_view1)) {
                        $sum=$sum+$row_list_view['sum_data'];
                        $tot++;
                    }
                    if ($tot==0) {
                        $tot=1;
                    }
                    $average_data1=$sum/$tot;

                    $sql_list_view='';
                    $rs_last_lp_view_id='';

                } elseif ($row_type['lp_type']==2) {//lp scorm
                    $sql = "SELECT id FROM $lp_view_table  WHERE user_id = '".intval($user_id)."' and lp_id='".$row_type['id']."'";
                    $rs_last_lp_view_id = Database::query($sql);
                    $lp_view_id = intval(Database::result($rs_last_lp_view_id,0,'id'));

                    $sql_list_view='SELECT li.max_score,lv.user_id,liw.score,((liw.score/li.max_score)*100) as sum_data FROM '.$lp_item_table.' li INNER JOIN '.$lp_view_table.' lv
                    ON li.lp_id=lv.lp_id INNER JOIN '.$lp_item_view_table.' liw ON liw.lp_item_id=li.id WHERE lv.user_id="'.$user_id.'" AND (li.item_type="sco" OR li.item_type="quiz") AND liw.lp_view_id="'.$lp_view_id.'"';
                    $tot=0;
                    $sum=0;

                    $rs_list_view2=Database::query($sql_list_view);
                    while ($row_list_view=Database::fetch_array($rs_list_view2)) {
                        $sum=$sum+$row_list_view['sum_data'];
                        $tot++;
                    }
                    if ($tot==0) {
                        $tot=1;
                    }
                    $average_data2=$sum/$tot;
                }
                $average_data_sum=$average_data_sum+$average_data1+$average_data2;
                $average_data2=0;
                $average_data1=0;
                $count_loop++;
            }

            //We only count the LP that have an exercise to get the average
            $lp_with_quiz = 0;
            foreach($lp_list as $lp_id) {

                //check if LP have a score
                $sql = "SELECT count(id) as count FROM $lp_item_table
                    WHERE item_type = 'quiz' AND lp_id = ".$lp_id." ";
                $result_have_quiz = Database::query($sql);

                if (Database::num_rows($result_have_quiz) > 0 ) {
                    $row = Database::fetch_array($result_have_quiz,'ASSOC');
                    if (is_numeric($row['count']) && $row['count'] != 0) {
                        $lp_with_quiz++;
                    }
                }
            }

            if ($lp_with_quiz > 0) {
                $avg_student_score = round(($average_data_sum / $lp_with_quiz * 100), 2);
            }
            return $avg_student_score;
        }

        /**
         * get count clicks about tools most used by course
         * @param      string     Course code
         * @param    int        Session id (optional), if param $session_id is null(default) it'll return results including sessions, 0 = session is not filtered
         * @return    array     tools data
         */
        public static function get_tools_most_used_by_course($course_code, $session_id = null) {
            //protect data
            $course_code = Database::escape_string($course_code);
            $data = array();
            $TABLETRACK_ACCESS    = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_LASTACCESS);
            $condition_session     = '';
            if (isset($session_id)) {
                $session_id = intval($session_id);
                $condition_session = ' AND access_session_id = '. $session_id;
            }
            $sql = "SELECT access_tool, COUNT(DISTINCT access_user_id),count( access_tool ) as count_access_tool
            FROM $TABLETRACK_ACCESS
            WHERE access_tool IS NOT NULL
                AND access_cours_code = '$course_code'
                $condition_session
            GROUP BY access_tool
            ORDER BY count_access_tool DESC
            LIMIT 0, 3";
                $rs = Database::query($sql);
                if (Database::num_rows($rs) > 0) {
                    while ($row = Database::fetch_array($rs)) {
                        $data[] = $row;
                    }
                }
                return $data;
        }

        /**
         * get documents most downloaded by course
         * @param      string     Course code
         * @param    int        Session id (optional), if param $session_id is null(default) it'll return results including sessions, 0 = session is not filtered
         * @param    int        Limit (optional, default = 0, 0 = without limit)
         * @return    array     documents downloaded
         */
        public static function get_documents_most_downloaded_by_course($course_code, $session_id = null, $limit = 0) {

            //protect data
            $course_code = Database::escape_string($course_code);
            $data = array();

            $TABLETRACK_DOWNLOADS   = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_DOWNLOADS);
            $condition_session = '';
            if (isset($session_id)) {
                $session_id = intval($session_id);
                $condition_session = ' AND down_session_id = '. $session_id;
            }
            $sql = "SELECT down_doc_path, COUNT(DISTINCT down_user_id), COUNT(down_doc_path) as count_down
            FROM $TABLETRACK_DOWNLOADS
            WHERE down_cours_id = '$course_code'
            $condition_session
            GROUP BY down_doc_path
            ORDER BY count_down DESC
            LIMIT 0,  $limit";
            $rs = Database::query($sql);

            if (Database::num_rows($rs) > 0) {
                while ($row = Database::fetch_array($rs)) {
                    $data[] = $row;
                }
            }
            return $data;
        }

        /**
         * get links most visited by course
         * @param      string     Course code
         * @param    int        Session id (optional), if param $session_id is null(default) it'll return results including sessions, 0 = session is not filtered
         * @return    array     links most visited
         */
        public static function get_links_most_visited_by_course($course_code, $session_id = null) {

            //protect data
            $course_code = Database::escape_string($course_code);
            $course_info=api_get_course_info($course_code);
            $data = array();

            $TABLETRACK_LINKS       = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_LINKS);
            $TABLECOURSE_LINKS      = Database::get_course_table(TABLE_LINK, $course_info['dbName']);

            $condition_session = '';
            if (isset($session_id)) {
                $session_id = intval($session_id);
                $condition_session = ' AND cl.session_id = '.$session_id;
            }

            $sql = "SELECT cl.title, cl.url,count(DISTINCT sl.links_user_id), count(cl.title) as count_visits
            FROM $TABLETRACK_LINKS AS sl, $TABLECOURSE_LINKS AS cl
            WHERE sl.links_link_id = cl.id
                AND sl.links_cours_id = '$_cid'
                $condition_session
            GROUP BY cl.title, cl.url
            ORDER BY count_visits DESC
            LIMIT 0, 3";
                $rs = Database::query($sql);
                if (Database::num_rows($rs) > 0) {
                    while ($row = Database::fetch_array($rs)) {
                        $data[] = $row;
                    }
                }
                return $data;
        }

        /**
         * Shows the user progress (when clicking in the Progress tab)
         * @param   int     user id
         * @return  string  html code
         */
        function show_user_progress($user_id, $session_id = 0, $extra_params = '', $show_courses = true) {
            require_once api_get_path(LIBRARY_PATH).'sessionmanager.lib.php';
            
            global $_configuration;
            $tbl_course_user            = Database :: get_main_table(TABLE_MAIN_COURSE_USER);
            $tbl_access_rel_course      = Database :: get_main_table(TABLE_MAIN_ACCESS_URL_REL_COURSE);
            $tbl_session_course_user    = Database :: get_main_table(TABLE_MAIN_SESSION_COURSE_USER);
            $tbl_access_rel_session     = Database :: get_main_table(TABLE_MAIN_ACCESS_URL_REL_SESSION);
            $tbl_access_rel_course      = Database :: get_main_table(TABLE_MAIN_ACCESS_URL_REL_COURSE);
            $user_id                    = intval($user_id);

            // get course list
            if ($_configuration['multiple_access_urls']) {
                $sql = 'SELECT cu.course_code FROM '.$tbl_course_user.' cu INNER JOIN '.$tbl_access_rel_course.' a  ON(a.course_code = cu.course_code) WHERE user_id='.$user_id.' AND relation_type<>'.COURSE_RELATION_TYPE_RRHH.' AND access_url_id = '.api_get_current_access_url_id().'';
            } else {
                $sql = 'SELECT course_code FROM '.$tbl_course_user.' WHERE user_id='.$user_id.' AND relation_type<>'.COURSE_RELATION_TYPE_RRHH.' ';
            }

            $rs = Database::query($sql);
            $courses = $course_in_session = array();

            while($row = Database :: fetch_array($rs)) {
                $courses[$row['course_code']] = CourseManager::get_course_information($row['course_code']);
            }

            // Get the list of sessions where the user is subscribed as student
            if ($_configuration['multiple_access_urls']) {
                $sql = 'SELECT DISTINCT cu.course_code, id_session as session_id FROM '.$tbl_session_course_user.' cu INNER JOIN '.$tbl_access_rel_session.' a  ON(a.session_id = cu.id_session) WHERE id_user='.$user_id.' AND access_url_id = '.api_get_current_access_url_id().'';
            } else {
                $sql = 'SELECT DISTINCT course_code, id_session as session_id FROM '.$tbl_session_course_user.' WHERE id_user='.$user_id;
            }

            $rs = Database::query($sql);
            while ($row = Database :: fetch_array($rs)) {
                $course_in_session[$row['session_id']][$row['course_code']] = CourseManager::get_course_information($row['course_code']);
            }

            $html = '';
            
            //Courses list
            if ($show_courses) {
                if (!empty($courses)) {
                    $html .= Display::tag('h1', Display::return_icon('course.png', get_lang('MyCourses'), array(), 22).' '.get_lang('MyCourses'));                
                    $html .= '<table class="data_table" width="100%">';                    
                    $html .= '<tr>                  
                              '.Display::tag('th', get_lang('Course'),          array('width'=>'300px')).'
                              '.Display::tag('th', get_lang('Time'),            array('class'=>'head')).'
                              '.Display::tag('th', get_lang('Progress'),        array('class'=>'head')).'
                              '.Display::tag('th', get_lang('Score').Display :: return_icon('info3.gif', get_lang('ScormAndLPTestTotalAverage'), array('align' => 'absmiddle', 'hspace' => '3px')),array('class'=>'head')).'
                              '.Display::tag('th', get_lang('LastConnexion'),   array('class'=>'head')).'      
                              '.Display::tag('th', get_lang('Details'),         array('class'=>'head')).'
                            </tr>';

                    foreach ($courses as $enreg) {
                        $weighting = 0;

                        $total_time_login      = Tracking :: get_time_spent_on_the_course($user_id, $enreg['code']);
                        $time                  = api_time_to_hms($total_time_login);
                        $progress              = Tracking :: get_avg_student_progress($user_id, $enreg['code']);
                        $percentage_score      = Tracking :: get_avg_student_score($user_id, $enreg['code'], array());
                        $last_connection       = Tracking :: get_last_connection_date_on_the_course($user_id, $enreg['code']);

                        if ($enreg['code'] == $_GET['course'] && empty($_GET['session_id'])) {
                            $html .= '<tr class="row_odd" style="background-color:#FBF09D">';
                        } else {
                            $html .= '<tr class="row_even">';
                        }
                        $url = api_get_course_url($enreg['code'], $session_id);
                        $course_url = Display::url($enreg['title'], $url, array('target'=>SESSION_LINK_TARGET));
                        $html .= '<td>'.$course_url.'</td>';

                        $html .= '<td align="center">'.$time.'</td>';
                        $html .= '<td align="center">'.$progress.'%</td>';

                        $html .= '<td align="center">';
                        if (is_numeric($percentage_score)) {
                            $html .= $percentage_score.'%';
                        } else {
                            $html .= '0%';
                        }
                        $html .= '</td>';
                        $html .= '<td align="center">'.$last_connection.'</td>';
                        $html .= '<td align="center">';
                        if ($enreg['code'] == $_GET['course'] && empty($_GET['session_id'])) {
                            $html .= '<a href="#">';
                            $html .= Display::return_icon('2rightarrow_na.gif', get_lang('Details'));
                        } else {
                            $html .= '<a href="'.api_get_self().'?course='.$enreg['code'].$extra_params.'">';
                            $html .= Display::return_icon('2rightarrow.gif', get_lang('Details'));
                        }
                        $html .= '</a>';
                        $html .= '</td></tr>';
                    }
                    $html .= '</table>';
                }
            }
            
            //Session
            if (!empty($course_in_session)) {                
                $html .= Display::tag('h1',Display::return_icon('session.png', get_lang('Sessions'), array(), 22).' '.get_lang('Sessions'));

                $exercise_graph_list = array();
                $exercise_graph_name_list = array();
                $session_graph = array();
                                
                foreach ($course_in_session as $my_session_id=>$course_list) {
                    $session_name = api_get_session_name($my_session_id);
                    $user_count = count(SessionManager::get_users_by_session($session_id));

                    foreach ($course_list as $course_data) {
                        $exercise_list = get_all_exercises($course_data, $my_session_id);

                        foreach($exercise_list as $exercise_data) {
                            if (!empty($exercise_data['start_time']) && $exercise_data['start_time'] != '0000-00-00 00:00:00') {
                                //echo $session_name.' - '.$course_data['title']." \n ".$exercise_data['title'].'<br />';
                                $exercise_graph_list[] = intval(get_best_average_score_by_exercise($exercise_data['id'], $course_data['code'], $my_session_id, $user_count));
                                $user_result_data = get_best_attempt_by_user(api_get_user_id(), $exercise_data['id'], $course_data['code'], $my_session_id);
                                $score = 0;
                                if (!empty($user_result_data['exe_weighting']) && intval($user_result_data['exe_weighting']) != 0) {
                                    $score = intval($user_result_data['exe_result']/$user_result_data['exe_weighting'] * 100);
                                }
                                //$user_results[] = 100;
                                $user_results[] = $score;
                                $exercise_graph_name_list[]= cut($session_name.' - '.$course_data['title'], 25)." \n ".cut($exercise_data['title'], 25);
                            }
                        }
                    }
                    if (!empty($user_results) && !empty($exercise_graph_list)) {
                        $session_graph[$my_session_id] = self::generate_session_exercise_graph($exercise_graph_name_list, $user_results, $exercise_graph_list);
                    }
                }
                
                $html .= '<table class="data_table" width="100%">';
                $html .= '<tr>
                      '.Display::tag('th', get_lang('Session'),                  array('width'=>'300px')).'
                      '.Display::tag('th', get_lang('PublishedExercises'),       array('width'=>'300px')).'
                      '.Display::tag('th', get_lang('DoneExercises'),            array('class'=>'head')).'
                      '.Display::tag('th', get_lang('AverageExerciseResult'),    array('class'=>'head')).'
                      '.Display::tag('th', get_lang('Details'),                  array('class'=>'head')).'                        
                      </tr>';
                
                foreach ($course_in_session as $key => $course_list) {
                    if (isset($session_id) && !empty($session_id)) {
                        if ($session_id != $key) {
                            continue;
                        }
                    }                   
       
                    $all_exercises = 0;
                    $all_done_exercise = 0;
                    $all_average = 0;

                    $stats_array = array();

                    foreach ($course_list as $enreg) {
                        //All exercises in the course @todo change for a real count
                        $exercises          = count(get_all_exercises($enreg, $key));
                        //Count of user results
                        //$done_exercises     = get_best_exercise_results_by_course($enreg['code'], $key);
                        $done_exercises     = get_count_exercises_attempted_by_course($enreg['code'], $key);
                        //Average
                        $average            = get_average_score_by_course($enreg['code'], $key);

                        $all_exercises     += $exercises;
                        $all_done_exercise += $done_exercises;
                        $all_average       += $average;
                        $stats_array[$enreg['code']] = array('exercises'=>$exercises, 'done_exercises'=>$done_exercises, 'average'=>$average);
                    }
                    
                    $all_average = $all_average /  count($course_list);
                    
                    if (isset($_GET['session_id']) && $key == $_GET['session_id']) {
                        $html .= '<tr style="background-color:#FBF09D">';
                    } else {
                        $html .= '<tr>';
                    }
                    
                    $html .= Display::tag('td', api_get_session_name($key));
                    $html .= Display::tag('td', $all_exercises);
                    $html .= Display::tag('td', $all_done_exercise);
                    $html .= Display::tag('td', convert_to_percentage($all_average));
                    
                                     
                    if (isset($_GET['session_id']) && $key == $_GET['session_id']) {
                        $icon = Display::url(Display::return_icon('2rightarrow_na.gif', get_lang('Details')), '?session_id='.$key);
                    } else {
                        $icon = Display::url(Display::return_icon('2rightarrow.gif', get_lang('Details')), '?session_id='.$key);
                    }
                    $html .= Display::tag('td', $icon);                    
                    $html .= '</tr>';                                   
                }                
                $html .='</table><br />';                
                
                //Checking selected session
                
                if (isset($_GET['session_id'])) {
                    $key = intval($_GET['session_id']);
                    $html .= Display::tag('h2',api_get_session_name($key).' - '.get_lang('CourseList'));
                    
                    $course_list = $course_in_session[$key];
    
                    $html .= '<table class="data_table" width="100%">';
                    $html .= '
                        <tr>
                          <th width="300px">'.get_lang('Course').'</th>
                          '.Display::tag('th', get_lang('PublishedExercises'),    array('class'=>'head')).'
                          '.Display::tag('th', get_lang('DoneExercises'),         array('class'=>'head')).'
                          '.Display::tag('th', get_lang('AverageExerciseResult'), array('class'=>'head')).'
                          '.Display::tag('th', get_lang('Time')         ,         array('class'=>'head')).'
                          '.Display::tag('th', get_lang('LPProgress')     ,       array('class'=>'head')).'
                          '.Display::tag('th', get_lang('Score').Display::return_icon('info3.gif', get_lang('ScormAndLPTestTotalAverage'), array ('align' => 'absmiddle', 'hspace' => '3px')), array('class'=>'head')).'
                          '.Display::tag('th', get_lang('LastConnexion'),         array('class'=>'head')).'      
                          '.Display::tag('th', get_lang('Details'),               array('class'=>'head')).'
                        </tr>';
                    
                    foreach ($course_list as $enreg) {
                        
                        //All exercises in the course @todo change for a real count
                        $exercises          = count(get_all_exercises($enreg, $key));
                        //Count of user results
                        //$done_exercises     = get_best_exercise_results_by_course($enreg['code'], $key);
                        $done_exercises     = get_count_exercises_attempted_by_course($enreg['code'], $key);
                        //Average
                        $average            = get_average_score_by_course($enreg['code'], $key);
           
                        $stats_array[$enreg['code']] = array('exercises'=>$exercises, 'done_exercises'=>$done_exercises, 'average'=>$average);
                        
                        $weighting = 0;
                        $last_connection       = Tracking :: get_last_connection_date_on_the_course($user_id, $enreg['code'], $key);
                        $progress              = Tracking :: get_avg_student_progress($user_id, $enreg['code'],array(), $key);
                        $total_time_login      = Tracking :: get_time_spent_on_the_course($user_id, $enreg['code'], $key);
                        $time                  = api_time_to_hms($total_time_login);
                        $percentage_score      = Tracking :: get_avg_student_score($user_id, $enreg['code'], array(), $key);
    
                        if ($enreg['code'] == $_GET['course'] && $_GET['session_id'] == $key) {
                            $html .= '<tr class="row_odd" style="background-color:#FBF09D" >';
                        } else {
                            $html .= '<tr class="row_even">';
                        }
    
                        $url        = api_get_course_url($enreg['code'], $key);
                        $course_url = Display::url($enreg['title'], $url, array('target'=>SESSION_LINK_TARGET));
    
                        $html .= Display::tag('td', $course_url);
                        $html .= Display::tag('td', $stats_array[$enreg['code']]['exercises']);
                        $html .= Display::tag('td', $stats_array[$enreg['code']]['done_exercises']);
                        $html .= Display::tag('td', convert_to_percentage($stats_array[$enreg['code']]['average']));
                        $html .= Display::tag('td', $time, array('align'=>'center'));
    
                        if (is_numeric($progress)) {
                            $progress = $progress.'%';
                        } else {
                            $progress = '0%';
                        }
                        $html .= Display::tag('td', $progress, array('align'=>'center'));
                        if (is_numeric($percentage_score)) {
                            $percentage_score = $percentage_score.'%';
                        } else {
                            $percentage_score = '0%';
                        }
                        $html .= Display::tag('td', $percentage_score, array('align'=>'center'));
                        $html .= Display::tag('td', $last_connection,  array('align'=>'center'));
    
                        if ($enreg['code'] == $_GET['course'] && $_GET['session_id'] == $key) {
                            $details = '<a href="#">';
                            $details .=Display::return_icon('2rightarrow_na.gif', get_lang('Details'));
                        } else {
                            $details = '<a href="'.api_get_self().'?course='.$enreg['code'].'&session_id='.$key.$extra_params.'">';
                            $details .=Display::return_icon('2rightarrow.gif', get_lang('Details'));
                        }
                        $details .= '</a>';                         
                        $html .= Display::tag('td', $details, array('align'=>'center'));
                        $html .= '</tr>';
                    }
                    $html .= '</table>'; 
                    
                    if (!empty($session_graph[$key])) {
                        $html .= Display::div($session_graph[$my_session_id], array('id'=>'session_graph_'.$key,'class'=>'chart-session', 'style'=>'position:relative; text-align: center;') );
                    }
                }
            }       
            if (!empty($html)) {
                $html = Display::div($html, array('class'=>'rounded_div', 'style'=>'position:relative; float:none; width:95%'));
            }         
            return $html;
        }


        /**
         * Shows the user detail progress (when clicking in the details link)
         * @param   int     user id
         * @param   string  course code
         * @param   int     session id
         * @return  string  html code
         */
        function show_course_detail($user_id, $course_code, $session_id) {
            $html = '';
            if (isset($course_code)) {
                require_once api_get_path(SYS_CODE_PATH).'exercice/exercise.lib.php';

                $user_id                    = intval($user_id);
                $session_id                 = intval($session_id);
                $course                     = Database::escape_string($course_code);
                $course_info                = CourseManager::get_course_information($course);

                $tbl_user                   = Database :: get_main_table(TABLE_MAIN_USER);
                $tbl_session                = Database :: get_main_table(TABLE_MAIN_SESSION);
                $tbl_session_course         = Database :: get_main_table(TABLE_MAIN_SESSION_COURSE);
                $tbl_session_course_user    = Database :: get_main_table(TABLE_MAIN_SESSION_COURSE_USER);
                $tbl_course_lp_view         = Database :: get_course_table(TABLE_LP_VIEW,   $course_info['db_name']);
                $tbl_course_lp_view_item    = Database :: get_course_table(TABLE_LP_ITEM_VIEW, $course_info['db_name']);
                $tbl_course_lp              = Database :: get_course_table(TABLE_LP_MAIN,   $course_info['db_name']);
                $tbl_course_lp_item         = Database :: get_course_table(TABLE_LP_ITEM,   $course_info['db_name']);
                $tbl_course_quiz            = Database :: get_course_table(TABLE_QUIZ_TEST, $course_info['db_name']);

                $session_name = api_get_session_name($session_id);
                $html .= Display::tag('h2', $course_info['title']);
                $html .='<table class="data_table" width="100%">';
                $html .= Display::tag('th', get_lang('Learnpaths'),     array('class'=>'head', 'style'=>'color:#000'));
                $html .= Display::tag('th', get_lang('Time'),          array('class'=>'head', 'style'=>'color:#000'));
                $html .= Display::tag('th', get_lang('Progress'),      array('class'=>'head', 'style'=>'color:#000'));
                $html .= Display::tag('th', get_lang('LastConnexion'), array('class'=>'head', 'style'=>'color:#000'));
                $html .= '</tr>';

                if (empty($session_id)) {
                    $sql_learnpath = "SELECT lp.name,lp.id FROM ".$tbl_course_lp." AS lp  WHERE session_id = 0 ORDER BY lp.display_order";
                } else {
                    $sql_learnpath = "SELECT lp.name,lp.id FROM ".$tbl_course_lp." AS lp ORDER BY lp.display_order";
                }

                $result_learnpath = Database::query($sql_learnpath);
                if (Database::num_rows($result_learnpath) > 0) {
                    while($learnpath = Database::fetch_array($result_learnpath)) {
                        $progress               = Tracking::get_avg_student_progress($user_id, $course, array($learnpath['id']), $session_id);
                        $last_connection_in_lp  = Tracking::get_last_connection_time_in_lp($user_id, $course, $learnpath['id'], $session_id);
                        $time_spent_in_lp       = Tracking::get_time_spent_in_lp($user_id, $course, array($learnpath['id']), $session_id);
                        $time_spent_in_lp       = api_time_to_hms($time_spent_in_lp);

                        $html .= '<tr class="row_even">';
                        $html .= Display::tag('td', $learnpath['name']);
                        $html .= Display::tag('td', $time_spent_in_lp, array('align'=>'center'));
                        if (is_numeric($progress)) {
                            $progress = $progress.'%';
                        }
                        $html .= Display::tag('td', $progress, array('align'=>'center'));
                        $last_connection = '-';
                        if (!empty($last_connection_in_lp)) {
                            $last_connection = api_convert_and_format_date($last_connection_in_lp, DATE_TIME_FORMAT_LONG);
                        }
                        $html .= Display::tag('td', $last_connection, array('align'=>'center','width'=>'180px'));
                        $html .= "</tr>";
                    }
                } else {
                    $html .= '<tr>
                          	<td colspan="4" align="center">
                            	'.get_lang('NoLearnpath').'
							</td>
						  </tr>';
                }
                $html .='</table><br />
                         <table class="data_table" width="100%">';

                // This code was commented on purpose see BT#924

                /*$sql = 'SELECT visibility FROM '.$course_info['db_name'].'.'.TABLE_TOOL_LIST.' WHERE name="quiz"';
                 $result_visibility_tests = Database::query($sql);

                 if (Database::result($result_visibility_tests, 0, 'visibility') == 1) {*/

                //Course details
                $html .= '<tr>
                <th class="head" style="color:#000">'.get_lang('Exercices').'</th>
                <th class="head" style="color:#000">'.get_lang('Attempts').'</th>                    
                <th class="head" style="color:#000">'.get_lang('BestAttempt').'</th>
                <th class="head" style="color:#000">'.get_lang('Ranking').'</th>
                <th class="head" style="color:#000">'.get_lang('BestResultInCourse').'</th>
                <th class="head" style="color:#000">'.get_lang('Statistics').' '.Display :: return_icon('info3.gif', get_lang('OnlyBestResultsPerStudent'), array('align' => 'absmiddle', 'hspace' => '3px')).'</th>                                        
                </tr>';

                if (empty($session_id)) {
                    $sql_exercices = "SELECT quiz.title,id, results_disabled FROM ".$tbl_course_quiz." AS quiz WHERE active='1' AND session_id = 0";
                } else {
                    $sql_exercices = "SELECT quiz.title,id, results_disabled FROM ".$tbl_course_quiz." AS quiz WHERE active='1'";
                }
                $result_exercices = Database::query($sql_exercices);
                $to_graph_exercise_result = array();
                if (Database::num_rows($result_exercices) > 0) {
                    $score = $weighting = $exe_id = 0;
                    while ($exercices = Database::fetch_array($result_exercices)) {
                        //if ($exercices['id'] != 3) continue;
                        $score = $weighting = $attempts = 0;
                        //Getting count of attempts by user
                        $attempts      = count_exercise_attempts_by_user(api_get_user_id(), $exercices['id'], $course_info['code'], $session_id);
                        //For graphics
                        $best_exercise_stats = get_best_exercise_results_by_user($exercices['id'], $course_info['code'], $session_id);
                        $to_graph_exercise_result[$exercices['id']] = array('title'=>$exercices['title'], 'data'=>$best_exercise_stats);

                        $html .= '<tr class="row_even">';
                        $url = api_get_path(WEB_CODE_PATH)."exercice/exercise_submit.php?cidReq={$course_info['code']}&id_session=$session_id&exerciseId={$exercices['id']}";
                        $exercices['title'] = Display::url($exercices['title'], $url, array('target'=>SESSION_LINK_TARGET));
                        $html .= Display::tag('td', $exercices['title']);

                        //Exercise configuration show results show results or show only score
                        if ($exercices['results_disabled'] == 0 || $exercices['results_disabled'] == 2) {
                            $latest_attempt_url = '';
                            $best_score = $position = $percentage_score_result  = '-';
                            $graph = $normal_graph = null;

                            //Getting best results
                            $best_score_data = get_best_attempt_in_course($exercices['id'], $course_info['code'], $session_id);
                            $best_score      = show_score($best_score_data['exe_result'], $best_score_data['exe_weighting']);
                             
                            if ($attempts > 0) {
                                $exercise_stat = get_best_attempt_by_user(api_get_user_id(), $exercices['id'], $course_info['code'], $session_id);
                                if (!empty($exercise_stat)) {

                                    //Always getting the BEST attempt
                                    $score          = $exercise_stat['exe_result'];
                                    $weighting      = $exercise_stat['exe_weighting'];
                                    $exe_id         = $exercise_stat['exe_id'];
                                     
                                    //$latest_attempt_url .= '<a href="../exercice/exercise_show.php?origin=myprogress&id='.$exe_id.'&cidReq='.$course_info['code'].'&id_session='.$session_id.'"> '.Display::return_icon('quiz.gif', get_lang('Quiz')).' </a>';
                                    $latest_attempt_url .= '../exercice/exercise_show.php?origin=myprogress&id='.$exe_id.'&cidReq='.$course_info['code'].'&id_session='.$session_id;
                                    $percentage_score_result = Display::url(show_score($score, $weighting), $latest_attempt_url);
                                    $my_score = 0;
                                    if (!empty($weighting) && intval($weighting) != 0) {
                                        $my_score = $score/$weighting;
                                    }
                                    $position = get_exercise_result_ranking($my_score, $exe_id, $exercices['id'], $course_info['code'], $session_id);

                                    $graph         = self::generate_exercise_result_thumbnail_graph($to_graph_exercise_result[$exercices['id']]);
                                    $normal_graph  = self::generate_exercise_result_graph($to_graph_exercise_result[$exercices['id']]);
                                }
                            }
                                                        
                            echo Display::div($normal_graph, array('id'=>'main_graph_'.$exercices['id'],'class'=>'dialog', 'style'=>'display:none') );

                            if (empty($graph)) {
                                $graph = '-';
                            } else {
                                $graph = Display::url($graph, '#', array('id'=>$exercices['id'], 'class'=>'opener'));
                            }

                            $html .= Display::tag('td', $attempts,                 array('align'=>'center'));
                            $html .= Display::tag('td', $percentage_score_result,  array('align'=>'center'));
                            $html .= Display::tag('td', $position,                 array('align'=>'center'));
                            $html .= Display::tag('td', $best_score,               array('align'=>'center'));
                            $html .= Display::tag('td', $graph,                    array('align'=>'center'));
                            //$html .= Display::tag('td', $latest_attempt_url,       array('align'=>'center', 'width'=>'25'));

                        } else {
                            // Exercise configuration NO results
                            $html .= Display::tag('td', $attempts,    array('align'=>'center'));
                            $html .= Display::tag('td', '-',          array('align'=>'center'));
                            $html .= Display::tag('td', '-',          array('align'=>'center'));
                            $html .= Display::tag('td', '-',          array('align'=>'center'));
                            $html .= Display::tag('td', '-',          array('align'=>'center'));
                        }
                        $html .= '</tr>';
                    }
                } else {
                    $html .= '<tr><td colspan="5" align="center">'.get_lang('NoEx').'</td></tr>';
                }
                $html .= '</table>';
            }
            if (!empty($html)) {
                $html = Display::div($html, array('class'=>'rounded_div', 'style'=>'position:relative; float:none; width:95%'));
            }
            return $html;
        }

        /**
         * Generates an histogram
         * 
         * @param 	array	list of exercise names
         * @param 	array	my results 0 to 100
         * @param 	array	average scores 0-100
         */
        function generate_session_exercise_graph($names, $my_results, $average) {
            require_once api_get_path(LIBRARY_PATH).'pchart/pData.class.php';
            require_once api_get_path(LIBRARY_PATH).'pchart/pChart.class.php';
            require_once api_get_path(LIBRARY_PATH).'pchart/pCache.class.php';
            //var_dump($names, $my_results, $average);
            $cache = new pCache();

            // Dataset definition
            $data_set = new pData();

            // Dataset definition
            $data_set->AddPoint($average,	 "Serie1");
            $data_set->AddPoint($my_results, "Serie2");
            $data_set->AddPoint($names,		 "Serie3");
            $data_set->AddAllSeries();
            $data_set->SetAbsciseLabelSerie('Serie3');
            $data_set->SetSerieName(get_lang('AverageScore'),"Serie1");
            $data_set->SetSerieName(get_lang('MyResults'),	 "Serie2");

            //$data_set->SetXAxisName(get_lang("Exercises"));
            $data_set->SetYAxisName(get_lang("Percentage"));
            $data_set->SetYAxisUnit("%");

            // Initialise the graph
            $main_width    = 820;
            $main_height   = 440;
            $y_label_angle = 35;
            $data_set->RemoveSerie("Serie3");
            $graph = new pChart($main_width, $main_height);
            //$graph->setFixedScale(0,100);

            $graph->setFontProperties(api_get_path(LIBRARY_PATH).'pchart/fonts/tahoma.ttf',8);
            $graph->setGraphArea(75,50,$main_width-140, $main_height-120);
            $graph->drawFilledRoundedRectangle(7,7,$main_width-7,$main_height-7,5,240,240,240);
            $graph->drawRoundedRectangle(5,5,$main_width-5,$main_height -5,5,230,230,230);
            $graph->drawGraphArea(255,255,255,TRUE);

            //SCALE_NORMAL, SCALE_START0, SCALE_ADDALLSTART0, SCALE_ADDALL
            $graph->drawScale($data_set->GetData(),$data_set->GetDataDescription(),SCALE_NORMAL ,150,150,150,TRUE,$y_label_angle,1, TRUE);
            $graph->drawGrid(4,TRUE,230,230,230,70);

            // Draw the 0 line
            $graph->setFontProperties(api_get_path(LIBRARY_PATH).'pchart/fonts/tahoma.ttf',6);
            $graph->drawTreshold(0,143,55,72,TRUE,TRUE);

            // Draw the cubic curve graph
            //$graph->drawCubicCurve($data_set->GetData(),$data_set->GetDataDescription());
            $graph->drawLineGraph($data_set->GetData(),$data_set->GetDataDescription());
            $graph->drawPlotGraph($data_set->GetData(),$data_set->GetDataDescription(),1,1,230,255,255);

            // Finish the graph
            $graph->setFontProperties(api_get_path(LIBRARY_PATH).'pchart/fonts/tahoma.ttf',8);
            $graph->drawLegend($main_width - 130,50,$data_set->GetDataDescription(),255,255,255);
            $graph->setFontProperties(api_get_path(LIBRARY_PATH).'pchart/fonts/tahoma.ttf',11);
            $graph->drawTitle(50, 30, get_lang('ExercisesInTimeProgressChart'), 50,50,50,$main_width-110, true);

            // $main_graph = new pChart($main_width,$main_height);

            $graph_id = 'generate_session_exercise_graph'.Security::remove_XSS($_GET['course']).'-'.intval($_GET['session_id']).'-'.api_get_user_id();
            if ($cache->IsInCache($graph_id, $data_set->GetData())) {
            //if (0) {
                //if we already created the img
                //echo 'in cache';
                $img_file = $cache->GetHash($graph_id,$data_set->GetData());
            } else {
                $cache->WriteToCache($graph_id, $data_set->GetData(), $graph);
                ob_start();
                $graph->Stroke();
                ob_end_clean();
                $img_file = $cache->GetHash($graph_id, $data_set->GetData());
            }
            $html = '<img src="'.api_get_path(WEB_ARCHIVE_PATH).$img_file.'">';
            return $html;
        }
        
        /**
         * 
         * Returns a thumbnail of the function generate_exercise_result_graph
         * @param 	array attempts 	

         */
        function generate_exercise_result_thumbnail_graph($attempts) {
            require_once api_get_path(LIBRARY_PATH).'pchart/pData.class.php';
            require_once api_get_path(LIBRARY_PATH).'pchart/pChart.class.php';
            require_once api_get_path(LIBRARY_PATH).'pchart/pCache.class.php';

            $exercise_title = $attempts['title'];
            $attempts       = $attempts['data'];
            $my_exercise_result_array = $exercise_result = array();
            if (empty($attempts)) {
                return null;
            }
             
            foreach ($attempts as $attempt) {
                if (api_get_user_id() == $attempt['exe_user_id']) {
                    if ($attempt['exe_weighting'] != 0 ) {
                        $my_exercise_result_array[]= $attempt['exe_result']/$attempt['exe_weighting'];
                    }
                } else {
                    if ($attempt['exe_weighting'] != 0 ) {
                        $exercise_result[]=  $attempt['exe_result']/$attempt['exe_weighting'];
                    }
                }
            }

            //Getting best result
            rsort($my_exercise_result_array);
            $my_exercise_result = 0;
            if (isset($my_exercise_result_array[0])) {
                $my_exercise_result = $my_exercise_result_array[0] *100;
            }

            //var_dump($exercise_result, $my_exercise_result);

            $max     = 100;
            $pieces  = 5 ;
            $part    = round($max / $pieces);
            $x_axis = array();
            $final_array = array();
            $my_final_array = array();

            for ($i=1; $i <=$pieces; $i++) {
                $sum = 1;
                if ($i == 1) {
                    $sum = 0;
                }
                $min = ($i-1)*$part + $sum;
                $max = ($i)*$part;
                $x_axis[]= $min." - ".$max;
                $count = 0;
                foreach($exercise_result as $result) {
                    $percentage = $result*100;
                    //echo $percentage.' - '.$min.' - '.$max."<br />";
                    if ($percentage >= $min && $percentage <= $max) {
                        //echo ' is > ';
                        $count++;
                    }
                }
                //echo '<br />';
                $final_array[]= $count;

                if ($my_exercise_result >= $min && $my_exercise_result <= $max) {
                    $my_final_array[] = 1;
                } else {
                    $my_final_array[] = 0;
                }
            }

            //var_dump($my_final_array, $final_array); exit;

            //Fix to remove the data of the user with my data

            for($i = 0; $i<=count($my_final_array); $i++) {
                if (!empty($my_final_array[$i])) {
                    $my_final_array[$i] =  $final_array[$i] + 1; //Add my result
                    $final_array[$i] = 0;
                }
            }
            //var_dump($my_final_array, $final_array); echo '<br />';

            //echo '<pre>'; var_dump($my_exercise_result, $exercise_result,$x_axis);
             
            $cache = new pCache();

            // Dataset definition
            $data_set = new pData();
            $data_set->AddPoint($final_array,"Serie1");
            $data_set->AddPoint($my_final_array,"Serie2");
            //$data_set->AddPoint($x_axis,"Serie3");
            $data_set->AddAllSeries();
             
            // Initialise the graph

            $main_width  = 80;
            $main_height = 35;

            $thumbnail_graph = new pChart($main_width, $main_height);

            $thumbnail_graph->setFontProperties(api_get_path(LIBRARY_PATH).'pchart/fonts/tahoma.ttf',8);
            //$thumbnail_graph->setGraphArea(50,30,680,200);
            $thumbnail_graph->drawFilledRoundedRectangle(2,2,$main_width-2,$main_height-2,2,230,230,230);
            $thumbnail_graph->setGraphArea(5,5,$main_width-5,$main_height-5);
            $thumbnail_graph->drawGraphArea(255,255,255);

            //SCALE_NORMAL, SCALE_START0, SCALE_ADDALLSTART0
            $thumbnail_graph->drawScale($data_set->GetData(),$data_set->GetDataDescription(),SCALE_ADDALLSTART0, 150,150,150,FALSE,0,1,TRUE);

            $thumbnail_graph->drawOverlayBarGraph($data_set->GetData(),$data_set->GetDataDescription(), 100);

            // Finish the graph
            $graph_id = 'thumbnail_exercise_result_graph_'.Security::remove_XSS($_GET['course']).'-'.intval($_GET['session_id']).'-'.api_get_user_id();

            if ($cache->IsInCache($graph_id, $data_set->GetData())) {
            //if (0) {
                //if we already created the img
                //echo 'in cache';
                $img_file = $cache->GetHash($graph_id,$data_set->GetData());
            } else {
                $cache->WriteToCache($graph_id, $data_set->GetData(), $thumbnail_graph);
                ob_start();
                $thumbnail_graph->Stroke();
                ob_end_clean();
                $img_file = $cache->GetHash($graph_id, $data_set->GetData());
            }
            $html = '<img src="'.api_get_path(WEB_ARCHIVE_PATH).$img_file.'">';
            return $html;
        }
        
        /**
         * Generates a big graph with the number of best results
         * @param	array	
         */
        function generate_exercise_result_graph($attempts) {

            require_once api_get_path(LIBRARY_PATH).'pchart/pData.class.php';
            require_once api_get_path(LIBRARY_PATH).'pchart/pChart.class.php';
            require_once api_get_path(LIBRARY_PATH).'pchart/pCache.class.php';

            $exercise_title = $attempts['title'];
            $attempts       = $attempts['data'];
            $my_exercise_result_array = $exercise_result = array();
            if (empty($attempts)) {
                return null;
            }
            foreach ($attempts as $attempt) {
                if (api_get_user_id() == $attempt['exe_user_id']) {
                    if ($attempt['exe_weighting'] != 0 ) {
                        $my_exercise_result_array[]= $attempt['exe_result']/$attempt['exe_weighting'];
                    }
                } else {
                    if ($attempt['exe_weighting'] != 0 ) {
                        $exercise_result[]=  $attempt['exe_result']/$attempt['exe_weighting'];
                    }
                }
            }

            //Getting best result
            rsort($my_exercise_result_array);
            $my_exercise_result = 0;
            if (isset($my_exercise_result_array[0])) {
                $my_exercise_result = $my_exercise_result_array[0] *100;
            }

            //var_dump($exercise_result, $my_exercise_result);

            $max = 100;
            $pieces = 5 ;
            $part = round($max / $pieces);
            $x_axis = array();
            $final_array = array();
            $my_final_array = array();

            for ($i=1; $i <=$pieces; $i++) {
                $sum = 1;
                if ($i == 1) {
                    $sum = 0;
                }
                $min = ($i-1)*$part + $sum;
                $max = ($i)*$part;
                $x_axis[]= $min." - ".$max;
                $count = 0;
                foreach($exercise_result as $result) {
                    $percentage = $result*100;
                    //echo $percentage.' - '.$min.' - '.$max."<br />";
                    if ($percentage >= $min && $percentage <= $max) {
                        //echo ' is > ';
                        $count++;
                    }
                }
                //echo '<br />';
                $final_array[]= $count;

                if ($my_exercise_result >= $min && $my_exercise_result <= $max) {
                    $my_final_array[] = 1;
                } else {
                    $my_final_array[] = 0;
                }
            }

            //var_dump($my_final_array, $final_array); exit;

            //Fix to remove the data of the user with my data

            for($i = 0; $i<=count($my_final_array); $i++) {
                if (!empty($my_final_array[$i])) {
                    $my_final_array[$i] =  $final_array[$i] + 1; //Add my result
                    $final_array[$i] = 0;
                }
            }
            //var_dump($my_final_array, $final_array); echo '<br />';

            //echo '<pre>'; var_dump($my_exercise_result, $exercise_result,$x_axis);

            $cache = new pCache();

            // Dataset definition
            $data_set = new pData();
            $data_set->AddPoint($final_array,"Serie1");
            $data_set->AddPoint($my_final_array,"Serie2");
            $data_set->AddPoint($x_axis,"Serie3");
            $data_set->AddAllSeries();

            $data_set->SetAbsciseLabelSerie('Serie3');
            $data_set->SetSerieName(get_lang('Score'),"Serie1");
            $data_set->SetSerieName(get_lang('MyResults'),"Serie2");

            $data_set->SetXAxisName(get_lang("Score"));

            // Initialise the graph
            $main_width  = 500;
            $main_height = 250;

            $main_graph = new pChart($main_width,$main_height);

            $main_graph->setFontProperties(api_get_path(LIBRARY_PATH).'pchart/fonts/tahoma.ttf',8);
            $main_graph->setGraphArea(50,30, $main_width -20,$main_height -50);

            $main_graph->drawFilledRoundedRectangle(10,10, $main_width- 10,$main_height -10,5,240,240,240);
            $main_graph->drawRoundedRectangle(7,7,$main_width - 7,$main_height  - 7,5,230,230,230);

            $main_graph->drawGraphArea(255,255,255,TRUE);

            //SCALE_NORMAL, SCALE_START0, SCALE_ADDALLSTART0
            $main_graph->drawScale($data_set->GetData(),$data_set->GetDataDescription(),SCALE_ADDALLSTART0, 150,150,150,TRUE,0,1,TRUE);
             
            $main_graph->drawGrid(4,TRUE,230,230,230,50);

            // Draw the 0 line
            $main_graph->setFontProperties(api_get_path(LIBRARY_PATH).'pchart/fonts/tahoma.ttf',6);
            //  $main_graph->drawTreshold(0,143,55,72,TRUE,TRUE);

            // Draw the bar graph
            $data_set->RemoveSerie("Serie3");

            //$main_graph->drawBarGraph($data_set->GetData(),$data_set->GetDataDescription(),TRUE);

            //$main_graph->drawStackedBarGraph($data_set->GetData(),$data_set->GetDataDescription(),TRUE);
            $main_graph->drawOverlayBarGraph($data_set->GetData(),$data_set->GetDataDescription(), 100);


            // Finish the graph
            $main_graph->setFontProperties(api_get_path(LIBRARY_PATH).'pchart/fonts/tahoma.ttf',8);
            $main_graph->drawLegend($main_width - 120,$main_height -100,$data_set->GetDataDescription(),255,255,255);
            $main_graph->setFontProperties(api_get_path(LIBRARY_PATH).'pchart/fonts/tahoma.ttf',8);
            $main_graph->drawTitle(180,22,$exercise_title,50,50,50);
            $graph_id = 'exercise_result_graph'.Security::remove_XSS($_GET['course']).'-'.intval($_GET['session_id']).'-'.api_get_user_id();
            if ($cache->IsInCache($graph_id, $data_set->GetData())) {
            //if (0) {
                //if we already created the img
                //echo 'in cache';
                $img_file = $cache->GetHash($graph_id,$data_set->GetData());
            } else {
                $cache->WriteToCache($graph_id, $data_set->GetData(), $main_graph);
                ob_start();
                $main_graph->Stroke();
                ob_end_clean();
                $img_file = $cache->GetHash($graph_id, $data_set->GetData());
            }
            $html = '<img src="'.api_get_path(WEB_ARCHIVE_PATH).$img_file.'">';
            return $html;
        }
}

class TrackingCourseLog {

    function count_item_resources() {
        global $session_id;

        $table_item_property = Database :: get_course_table(TABLE_ITEM_PROPERTY);
        $table_user = Database :: get_main_table(TABLE_MAIN_USER);

        $sql = "SELECT count(tool) AS total_number_of_items FROM $table_item_property track_resource, $table_user user" .
                " WHERE track_resource.insert_user_id = user.user_id AND id_session = $session_id ";

        if (isset($_GET['keyword'])) {
            $keyword = Database::escape_string(trim($_GET['keyword']));
            $sql .= " AND (user.username LIKE '%".$keyword."%' OR lastedit_type LIKE '%".$keyword."%' OR tool LIKE '%".$keyword."%')";
        }

        $sql .= " AND tool IN ('document', 'learnpath', 'quiz', 'glossary', 'link', 'course_description', 'announcement', 'thematic', 'thematic_advance', 'thematic_plan')";
        $res = Database::query($sql);
        $obj = Database::fetch_object($res);
        return $obj->total_number_of_items;
    }

    function get_item_resources_data($from, $number_of_items, $column, $direction) {
        global $dateTimeFormatLong, $session_id;

        $table_item_property = Database :: get_course_table(TABLE_ITEM_PROPERTY);
        $table_user = Database :: get_main_table(TABLE_MAIN_USER);
        $table_session = Database :: get_main_table(TABLE_MAIN_SESSION);

        $sql = "SELECT
                     tool as col0,
                    lastedit_type as col1,
                    ref as ref,
                    user.username as col3,
                    insert_date as col5,
                    visibility as col6
                FROM $table_item_property track_resource, $table_user user
                WHERE track_resource.insert_user_id = user.user_id AND id_session = $session_id ";

        if (isset($_GET['keyword'])) {
            $keyword = Database::escape_string(trim($_GET['keyword']));
            $sql .= " AND (user.username LIKE '%".$keyword."%' OR lastedit_type LIKE '%".$keyword."%' OR tool LIKE '%".$keyword."%') ";
        }

        $sql .= " AND tool IN ('document', 'learnpath', 'quiz', 'glossary', 'link', 'course_description', 'announcement', 'thematic', 'thematic_advance', 'thematic_plan')";

        if ($column == 0) { $column = '0'; }
        if ($column != '' && $direction != '') {
            if ($column != 2 && $column != 4) {
                $sql .=    " ORDER BY col$column $direction";
            }
        } else {
            $sql .=    " ORDER BY col5 DESC ";
        }

        $sql .=    " LIMIT $from, $number_of_items ";

        $res = Database::query($sql);
        $resources = array ();
        $thematic_tools = array('thematic', 'thematic_advance', 'thematic_plan');
        while ($row = Database::fetch_array($res)) {
            $ref = $row['ref'];
            $table_name = TrackingCourseLog::get_tool_name_table($row['col0']);
            $table_tool = Database :: get_course_table($table_name['table_name']);

            $id = $table_name['id_tool'];
            if ($row['col0'] == 'thematic_plan' || $row['col0'] == 'thematic_advance') {
                $tbl_thematic = Database :: get_course_table(TABLE_THEMATIC);
                $rs_thematic = Database::query("SELECT thematic_id FROM $table_tool WHERE id=$ref");
                $row_thematic = Database::fetch_array($rs_thematic);
                $thematic_id = $row_thematic['thematic_id'];

                $query = "SELECT session.id, session.name, user.username FROM $tbl_thematic t, $table_session session, $table_user user" .
                        " WHERE t.session_id = session.id AND session.id_coach = user.user_id AND t.id = $thematic_id";

            } else {
                $query = "SELECT session.id, session.name, user.username FROM $table_tool tool, $table_session session, $table_user user" .
                        " WHERE tool.session_id = session.id AND session.id_coach = user.user_id AND tool.$id = $ref";
            }


            $recorset = Database::query($query);

            if (!empty($recorset)) {
                $obj = Database::fetch_object($recorset);

                $name_session = '';
                $coach_name = '';
                if (!empty($obj)) {
                    $name_session = $obj->name;
                    $coach_name = $obj->username;
                }

                $url_tool = api_get_path(WEB_CODE_PATH).$table_name['link_tool'];
                $row[0] = '';
                if ($row['col6'] != 2) {
                    if (in_array($row['col0'], $thematic_tools)) {

                        $exp_thematic_tool = explode('_', $row['col0']);
                        $thematic_tool_title = '';
                        if (is_array($exp_thematic_tool)) {
                            foreach ($exp_thematic_tool as $exp) {
                                $thematic_tool_title .= api_ucfirst($exp);
                            }
                        } else {
                            $thematic_tool_title = api_ucfirst($row['col0']);
                        }

                        $row[0] = '<a href="'.$url_tool.'?'.api_get_cidreq().'&action=thematic_details">'.get_lang($thematic_tool_title).'</a>';
                    } else {
                        $row[0] = '<a href="'.$url_tool.'?'.api_get_cidreq().'&'.$obj->id.'">'.get_lang('Tool'.api_ucfirst($row['col0'])).'</a>';
                    }
                } else {
                    $row[0] = api_ucfirst($row['col0']);
                }
                $row[1] = get_lang($row[1]);
                $row[5] = api_convert_and_format_date($row['col5'], null, date_default_timezone_get());

                $row[4] = '';
                switch ($table_name['table_name']) {
                    case 'document' :
                        $query_document = "SELECT tool.title as title FROM $table_tool tool" .
                                            " WHERE id = $ref";
                        $rs_document = Database::query($query_document);
                        $obj_document = Database::fetch_object($rs_document);
                        $row[4] = $obj_document->title;
                        break;
                    case 'announcement':
                        $query_document = "SELECT title FROM $table_tool " .
                                            " WHERE id = $ref";
                        $rs_document = Database::query($query_document);
                        $obj_document = Database::fetch_object($rs_document);
                        $row[4] = $obj_document->title;
                        break;
                    case 'glossary':
                        $query_document = "SELECT name FROM $table_tool " .
                                                " WHERE glossary_id = $ref";
                        $rs_document = Database::query($query_document);
                        $obj_document = Database::fetch_object($rs_document);
                        $row[4] = $obj_document->name;
                        break;
                    case 'lp':
                        $query_document = "SELECT name FROM $table_tool " .
                                                " WHERE id = $ref";
                        $rs_document = Database::query($query_document);
                        $obj_document = Database::fetch_object($rs_document);
                        $row[4] = $obj_document->name;
                        break;
                    case 'quiz':
                        $query_document = "SELECT title FROM $table_tool " .
                                                " WHERE id = $ref";
                        $rs_document = Database::query($query_document);
                        $obj_document = Database::fetch_object($rs_document);
                        $row[4] = $obj_document->title;
                        break;

                    case 'course_description':
                        $query_document = "SELECT title FROM $table_tool " .
                                                " WHERE id = $ref";
                        $rs_document = Database::query($query_document);
                        $obj_document = Database::fetch_object($rs_document);
                        $row[4] = $obj_document->title;
                        break;

                    case 'thematic':
                        $rs = Database::query("SELECT title FROM $table_tool WHERE id = $ref");
                        if (Database::num_rows($rs) > 0) {
                            $obj = Database::fetch_object($rs);
                            $row[4] = $obj->title;
                        }
                        break;
                    case 'thematic_advance':
                        $rs = Database::query("SELECT content FROM $table_tool WHERE id = $ref");
                        if (Database::num_rows($rs) > 0) {
                            $obj = Database::fetch_object($rs);
                            $row[4] = $obj->content;
                        }
                        break;
                    case 'thematic_plan':
                        $rs = Database::query("SELECT title FROM $table_tool WHERE id = $ref");
                        if (Database::num_rows($rs) > 0) {
                            $obj = Database::fetch_object($rs);
                            $row[4] = $obj->title;
                        }
                        break;

                    default:
                        break;
                }

                $row2 = $name_session;
                if (!empty($coach_name)) {
                    $row2 .= '<br />'.get_lang('Coach').': '.$coach_name;
                }
                $row[2] = $row2;

                $resources[] = $row;
            }
        }

        return $resources;
    }

    function get_tool_name_table($tool) {
        switch ($tool) {
            case 'document':
                $table_name = TABLE_DOCUMENT;
                $link_tool = 'document/document.php';
                $id_tool = 'id';
                break;
            case 'learnpath':
                $table_name = TABLE_LP_MAIN;
                $link_tool = 'newscorm/lp_controller.php';
                $id_tool = 'id';
                break;
            case 'quiz':
                $table_name = TABLE_QUIZ_TEST;
                $link_tool = 'exercice/exercice.php';
                $id_tool = 'id';
                break;
            case 'glossary':
                $table_name = TABLE_GLOSSARY;
                $link_tool = 'glossary/index.php';
                $id_tool = 'glossary_id';
                break;
            case 'link':
                $table_name = TABLE_LINK;
                $link_tool = 'link/link.php';
                $id_tool = 'id';
                break;
            case 'course_description':
                $table_name = TABLE_COURSE_DESCRIPTION;
                $link_tool = 'course_description/';
                $id_tool = 'id';
                break;
            case 'announcement':
                $table_name = TABLE_ANNOUNCEMENT;
                $link_tool = 'announcements/announcements.php';
                $id_tool = 'id';
                break;
            case 'thematic':
                $table_name = TABLE_THEMATIC;
                $link_tool = 'course_progress/index.php';
                $id_tool = 'id';
                break;
            case 'thematic_advance':
                $table_name = TABLE_THEMATIC_ADVANCE;
                $link_tool = 'course_progress/index.php';
                $id_tool = 'id';
                break;
            case 'thematic_plan':
                $table_name = TABLE_THEMATIC_PLAN;
                $link_tool = 'course_progress/index.php';
                $id_tool = 'id';
                break;
            default:
                $table_name = $tool;
                break;
        }
        return array('table_name' => $table_name,'link_tool' => $link_tool,'id_tool' => $id_tool);
    }

    function display_additional_profile_fields() {
        // getting all the extra profile fields that are defined by the platform administrator
        $extra_fields = UserManager :: get_extra_fields(0,50,5,'ASC');
        

        // creating the form
        $return = '<form action="courseLog.php" method="get" name="additional_profile_field_form" id="additional_profile_field_form">';

        // the select field with the additional user profile fields (= this is where we select the field of which we want to see
        // the information the users have entered or selected.        
        $return .= '<select name="additional_profile_field">';
        $return .= '<option value="-">'.get_lang('SelectFieldToAdd').'</option>';
        $extra_fields_to_show = 0;
        foreach ($extra_fields as $key=>$field) {
            // show only extra fields that are visible + and can be filtered, added by J.Montoya
            if ($field[6]==1 && $field[8] == 1) {
                if ($field[0] == $_GET['additional_profile_field'] ) {
                    $selected = 'selected="selected"';
                } else {
                    $selected = '';
                }
                $extra_fields_to_show++;
                $return .= '<option value="'.$field[0].'" '.$selected.'>'.$field[3].'</option>';
            }
        }
        $return .= '</select>';

        // the form elements for the $_GET parameters (because the form is passed through GET
        foreach ($_GET as $key=>$value){
            if ($key <> 'additional_profile_field')    {
                $return .= '<input type="hidden" name="'.Security::remove_XSS($key).'" value="'.Security::remove_XSS($value).'" />';
            }
        }
        // the submit button
        $return .= '<button class="save" type="submit">'.get_lang('AddAdditionalProfileField').'</button>';
        $return .= '</form>';
        if ($extra_fields_to_show > 0) {
            return $return;
        } else {
            return '';
        }
    }

    /**
     * This function gets all the information of a certrain ($field_id) additional profile field.
     * It gets the information of all the users so that it can be displayed in the sortable table or in the csv or xls export
     *
     * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University, Belgium
     * @since October 2009
     * @version 1.8.7
     */
    function get_addtional_profile_information_of_field($field_id){
        // Database table definition
        $table_user             = Database::get_main_table(TABLE_MAIN_USER);
        $table_user_field_values     = Database::get_main_table(TABLE_MAIN_USER_FIELD_VALUES);

        $sql = "SELECT user.user_id, field.field_value FROM $table_user user, $table_user_field_values field
            WHERE user.user_id = field.user_id
            AND field.field_id='".intval($field_id)."'";
        $result = Database::query($sql);
        while($row = Database::fetch_array($result)) {
            $return[$row['user_id']][] = $row['field_value'];
        }
        return $return;
    }

    /**
     * This function gets all the information of a certrain ($field_id) additional profile field for a specific list of users is more efficent than  get_addtional_profile_information_of_field() function
     * It gets the information of all the users so that it can be displayed in the sortable table or in the csv or xls export
     *
     * @author    Julio Montoya <gugli100@gmail.com>
     * @param    int field id
     * @param    array list of user ids
     * @return    array
     * @since    Nov 2009
     * @version    1.8.6.2
     */
    function get_addtional_profile_information_of_field_by_user($field_id, $users) {
        // Database table definition
        $table_user                 = Database::get_main_table(TABLE_MAIN_USER);
        $table_user_field_values     = Database::get_main_table(TABLE_MAIN_USER_FIELD_VALUES);
        $result_extra_field         = UserManager::get_extra_field_information($field_id);

        if (!empty($users)) {
            if ($result_extra_field['field_type'] == USER_FIELD_TYPE_TAG ) {
                foreach($users as $user_id) {
                    $user_result = UserManager::get_user_tags($user_id, $field_id);
                    $tag_list = array();
                    foreach($user_result as $item) {
                        $tag_list[] = $item['tag'];
                    }
                    $return[$user_id][] = implode(', ',$tag_list);
                }
            } else {
                $new_user_array = array();
                foreach($users as $user_id) {
                    $new_user_array[]= "'".$user_id."'";
                }
                $users = implode(',',$new_user_array);
                //selecting only the necessary information NOT ALL the user list
                $sql = "SELECT user.user_id, field.field_value FROM $table_user user INNER JOIN $table_user_field_values field
                        ON (user.user_id = field.user_id)
                        WHERE field.field_id=".intval($field_id)." AND user.user_id IN ($users)";

                $result = Database::query($sql);
                while($row = Database::fetch_array($result)) {
                    // get option value for field type double select by id
                    if (!empty($row['field_value'])) {
                        if ($result_extra_field['field_type'] == USER_FIELD_TYPE_DOUBLE_SELECT) {
                            $id_double_select = explode(';',$row['field_value']);
                            if (is_array($id_double_select)) {
                                $value1 = $result_extra_field['options'][$id_double_select[0]]['option_value'];
                                $value2 = $result_extra_field['options'][$id_double_select[1]]['option_value'];
                                $row['field_value'] = ($value1.';'.$value2);
                            }
                        }
                    }
                    // get other value from extra field
                    $return[$row['user_id']][] = $row['field_value'];
                }
            }
        }
        return $return;
    }

    /**
     * count the number of students in this course (used for SortableTable)
     * Deprecated
     */
    function count_student_in_course() {
        global $nbStudents;
        return $nbStudents;
    }

    function sort_users($a, $b) {
        return strcmp(trim(api_strtolower($a[$_SESSION['tracking_column']])), trim(api_strtolower($b[$_SESSION['tracking_column']])));
    }

    function sort_users_desc($a, $b) {
        return strcmp( trim(api_strtolower($b[$_SESSION['tracking_column']])), trim(api_strtolower($a[$_SESSION['tracking_column']])));
    }

    /**
     * Get number of users for sortable with pagination
     * @return int
     */
    function get_number_of_users() {
        global $user_ids;
        return count($user_ids);
    }

    /**
     * Get data for users list in sortable with pagination
     * @return array
     */
    function get_user_data($from, $number_of_items, $column, $direction) {
        global $user_ids, $course_code, $additional_user_profile_info, $export_csv, $is_western_name_order, $csv_content, $session_id, $_configuration;

        $course_code        = Database::escape_string($course_code);        
        $tbl_user           = Database::get_main_table(TABLE_MAIN_USER);
        $tbl_url_rel_user   = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
        
        $course_info        = CourseManager::get_course_information($course_code);
        $access_url_id      = api_get_current_access_url_id();
        
        // get all users data from a course for sortable with limit
        $condition_user = "";
        if (is_array($user_ids)) {
            $user_ids = array_map('intval', $user_ids);
            $condition_user = " WHERE user.user_id IN (".implode(',',$user_ids).") ";
        } else {
            $user_ids = intval($user_ids);
            $condition_user = " WHERE user.user_id = $user_ids ";
        }
                 
        if (!empty($_GET['user_keyword'])) {
            $keyword = trim(Database::escape_string($_GET['user_keyword']));
            $condition_user .=  " AND  (user.firstname LIKE '%".$keyword."%' OR user.lastname LIKE '%".$keyword."%'  OR user.username LIKE '%".$keyword."%'  OR user.email LIKE '%".$keyword."%' ) ";
        }            

        if ($_configuration['multiple_access_urls']) {
            $url_table = ", ".$tbl_url_rel_user."as url_users";
            $url_condition = " AND user.user_id = url_users.user_id AND access_url_id='$access_url_id'";
        }

        $sql = "SELECT user.user_id as user_id,
                user.official_code  as col0,
                user.lastname       as col1,
                user.firstname      as col2
                FROM $tbl_user as user $url_table
                $condition_user $url_condition";

                if (!in_array($direction, array('ASC','DESC'))) {
                    $direction = 'ASC';
                }
                $column = intval($column);
                
                if ($is_western_name_order) {     
                    $original_column = $column;                
                    if ($original_column == 1) {
                        $column = 2;
                    }
                    if ($original_column == 2) {
                         $column = 1;
                    }                 
                }
                $from            = intval($from);
                $number_of_items = intval($number_of_items);
                
                $sql .= " ORDER BY col$column $direction ";
                $sql .= " LIMIT $from,$number_of_items";

                $res = Database::query($sql);
                $users = array ();
                $t = time();
                $row = array();
                while ($user = Database::fetch_array($res, 'ASSOC')) {
                    //$user['user_id'] = $user['user_id']
                    $user['official_code']  = $user['col0'];
                    if ($is_western_name_order) {                        
                        $user['lastname']       = $user['col2'];
                        $user['firstname']      = $user['col1'];                     
                    } else {                        
                        $user['lastname']       = $user['col1'];
                        $user['firstname']      = $user['col2'];
                    }           
                    $user['time'] = api_time_to_hms(Tracking::get_time_spent_on_the_course($user['user_id'], $course_code, $session_id));

                    $avg_student_score      = Tracking::get_avg_student_score($user['user_id'], $course_code, array(), $session_id);                                
                    $avg_student_progress   = Tracking::get_avg_student_progress($user['user_id'], $course_code, array(), $session_id);
                    if (empty($avg_student_progress)) { $avg_student_progress=0; }
                    $user['average_progress'] = $avg_student_progress.'%';

                    if (is_numeric($avg_student_score)) {
                        $user['student_score'] = $avg_student_score.'%';
                    } else {
                        $user['student_score'] = $avg_student_score;
                    }
                    $user['count_assignments']  = Tracking::count_student_assignments($user['user_id'], $course_code, $session_id);
                    $user['count_messages']     = Tracking::count_student_messages($user['user_id'], $course_code, $session_id);
                    $user['first_connection']   = Tracking::get_first_connection_date_on_the_course($user['user_id'], $course_code, $session_id);
                    $user['last_connection']    = Tracking::get_last_connection_date_on_the_course($user['user_id'], $course_code, $session_id);

                    // we need to display an additional profile field
                    if (isset($_GET['additional_profile_field']) AND is_numeric($_GET['additional_profile_field'])) {
                        if (is_array($additional_user_profile_info[$user['user_id']])) {
                            $row['additional']=implode(', ', $additional_user_profile_info[$user['user_id']]);
                        } else {
                            $row['additional']='&nbsp;';
                        }
                    }
                    $user['link'] = '<center><a href="../mySpace/myStudents.php?student='.$user['user_id'].'&details=true&course='.$course_code.'&origin=tracking_course&id_session='.$session_id.'"><img src="'.api_get_path(WEB_IMG_PATH).'2rightarrow.gif" border="0" /></a></center>';
                    
                     // store columns in array $users
                    $user_row = array($user['official_code'],  
                                     $user['lastname'], 
                                     $user['firstname'], 
                                     $user['time'],
                                     $user['average_progress'],
                                     $user['student_score'],
                                     $user['count_assignments'],
                                     $user['count_messages'],
                                     $user['first_connection'],
                                     $user['last_connection'],
                                     $user['additional'],
                                     $user['link']);
                    $users[] = $user_row;
                    if ($export_csv) {                        
                        unset($user_row[11]);
                        unset($user_row[12]);
                        $csv_content[] = $user_row;
                    }                                       
                }
                return $users;
    }
}

class TrackingUserLog {

    /**
     * Displays the number of logins every month for a specific user in a specific course.
     */
    function display_login_tracking_info($view, $user_id, $course_id, $session_id = 0)
    {
        $MonthsLong = $GLOBALS['MonthsLong'];

        // protected data
        $user_id = intval($user_id);
        $session_id = intval($session_id);
        $course_id = Database::escape_string($course_id);

        $track_access_table = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_ACCESS);
        $tempView = $view;
        if(substr($view,0,1) == '1') {
            $new_view = substr_replace($view,'0',0,1);
            echo "
                <tr>
                    <td valign='top'>
                    <font color='#0000FF'>-&nbsp;&nbsp;&nbsp;</font>" .
                    "<b>".get_lang('LoginsAndAccessTools')."</b>&nbsp;&nbsp;&nbsp;[<a href='".api_get_self()."?uInfo=".$user_id."&view=".Security::remove_XSS($new_view)."'>".get_lang('Close')."</a>]&nbsp;&nbsp;&nbsp;[<a href='userLogCSV.php?".api_get_cidreq()."&uInfo=".Security::remove_XSS($_GET['uInfo'])."&view=10000'>".get_lang('ExportAsCSV')."</a>]
                    </td>
                </tr>
                ";
            echo "<tr><td style='padding-left : 40px;' valign='top'>".get_lang('LoginsDetails')."<br>";

            $sql = "SELECT UNIX_TIMESTAMP(access_date), count(access_date)
                        FROM $track_access_table
                        WHERE access_user_id = '$user_id'
                        AND access_cours_code = '$course_id'
                        AND access_session_id = '$session_id'
                        GROUP BY YEAR(access_date),MONTH(access_date)
                        ORDER BY YEAR(access_date),MONTH(access_date) ASC";

            echo "<tr><td style='padding-left : 40px;padding-right : 40px;'>";
            //$results = getManyResults2Col($sql);
            $results = getManyResults3Col($sql);

            echo "<table cellpadding='2' cellspacing='1' border='0' align=center>";
            echo "<tr>
                    <td class='secLine'>
                    ".get_lang('LoginsTitleMonthColumn')."
                    </td>
                    <td class='secLine'>
                    ".get_lang('LoginsTitleCountColumn')."
                    </td>
                </tr>";
            $total = 0;
            if (is_array($results)) {
                for($j = 0 ; $j < count($results) ; $j++) {
                    echo "<tr>";
                    echo "<td class='content'><a href='logins_details.php?uInfo=".$user_id."&reqdate=".$results[$j][0]."&view=".Security::remove_XSS($view)."'>".$MonthsLong[date('n', $results[$j][0])-1].' '.date('Y', $results[$j][0])."</a></td>";
                    echo "<td valign='top' align='right' class='content'>".$results[$j][1]."</td>";
                    echo"</tr>";
                    $total = $total + $results[$j][1];
                }
                echo "<tr>";
                echo "<td>".get_lang('Total')."</td>";
                echo "<td align='right' class='content'>".$total."</td>";
                echo"</tr>";
            } else {
                echo "<tr>";
                echo "<td colspan='2'><center>".get_lang('NoResult')."</center></td>";
                echo"</tr>";
            }
            echo "</table>";
            echo "</td></tr>";
        } else {
            $new_view = substr_replace($view,'1',0,1);
            echo "
                <tr>
                    <td valign='top'>
                    +<font color='#0000FF'>&nbsp;&nbsp;</font><a href='".api_get_self()."?uInfo=".$user_id."&view=".Security::remove_XSS($new_view)."' class='specialLink'>".get_lang('LoginsAndAccessTools')."</a>
                    </td>
                </tr>
            ";
        }
    }

    /**
     * Displays the exercise results for a specific user in a specific course.
     * @todo remove globals
     */
    function display_exercise_tracking_info($view, $user_id, $course_id)
    {
        global $TABLECOURSE_EXERCICES, $TABLETRACK_EXERCICES, $dateTimeFormatLong;
        if(substr($view,1,1) == '1')
        {
            $new_view = substr_replace($view,'0',1,1);
            echo "<tr>
                    <td valign='top'>
                        <font color='#0000FF'>-&nbsp;&nbsp;&nbsp;</font><b>".get_lang('ExercicesResults')."</b>&nbsp;&nbsp;&nbsp;[<a href='".api_get_self()."?uInfo=".Security::remove_XSS($user_id)."&view=".Security::remove_XSS($new_view)."'>".get_lang('Close')."</a>]&nbsp;&nbsp;&nbsp;[<a href='userLogCSV.php?".api_get_cidreq()."&uInfo=".Security::remove_XSS($_GET['uInfo'])."&view=01000'>".get_lang('ExportAsCSV')."</a>]
                    </td>
                </tr>";
            echo "<tr><td style='padding-left : 40px;' valign='top'>".get_lang('ExercicesDetails')."<br />";

            $sql = "SELECT ce.title, te.exe_result , te.exe_weighting, UNIX_TIMESTAMP(te.exe_date)
                FROM $TABLECOURSE_EXERCICES AS ce , $TABLETRACK_EXERCICES AS te
                WHERE te.exe_cours_id = '".Database::escape_string($course_id)."'
                    AND te.exe_user_id = '".Database::escape_string($user_id)."'
                    AND te.exe_exo_id = ce.id
                ORDER BY ce.title ASC, te.exe_date ASC";

            $hpsql = "SELECT te.exe_name, te.exe_result , te.exe_weighting, UNIX_TIMESTAMP(te.exe_date)
                FROM $TBL_TRACK_HOTPOTATOES AS te
                WHERE te.exe_user_id = '".Database::escape_string($user_id)."' AND te.exe_cours_id = '".Database::escape_string($course_id)."'
                ORDER BY te.exe_cours_id ASC, te.exe_date ASC";

            $hpresults = getManyResultsXCol($hpsql, 4);

            $NoTestRes = 0;
            $NoHPTestRes = 0;

            echo "<tr>\n<td style='padding-left : 40px;padding-right : 40px;'>\n";
            $results = getManyResultsXCol($sql, 4);
            echo "<table cellpadding='2' cellspacing='1' border='0' align='center'>\n";
            echo "
                <tr bgcolor='#E6E6E6'>
                    <td>
                    ".get_lang('ExercicesTitleExerciceColumn')."
                    </td>
                    <td>
                    ".get_lang('Date')."
                    </td>
                    <td>
                    ".get_lang('ExercicesTitleScoreColumn')."
                    </td>
                </tr>";

            if (is_array($results)) {
                for($i = 0; $i < sizeof($results); $i++) {
                    $display_date = api_convert_and_format_date($results[$i][3], null, date_default_timezone_get());
                    echo "<tr>\n";
                    echo "<td class='content'>".$results[$i][0]."</td>\n";
                    echo "<td class='content'>".$display_date."</td>\n";
                    echo "<td valign='top' align='right' class='content'>".$results[$i][1]." / ".$results[$i][2]."</td>\n";
                    echo "</tr>\n";
                }
            } else {
                // istvan begin
                $NoTestRes = 1;
            }

            // The Result of Tests
            if(is_array($hpresults)) {
                for($i = 0; $i < sizeof($hpresults); $i++) {
                    $title = GetQuizName($hpresults[$i][0],'');
                    if ($title == '')
                    $title = basename($hpresults[$i][0]);
                    $display_date = api_convert_and_format_date($hpresults[$i][3], null, date_default_timezone_get());
                    ?>
<tr>
	<td class="content"><?php echo $title; ?></td>
	<td class="content" align="center"><?php echo $display_date; ?></td>
	<td class="content" align="center"><?php echo $hpresults[$i][1]; ?> / <?php echo $hpresults[$i][2]; ?></td>
</tr>
                    <?php        }
            } else {
                $NoHPTestRes = 1;
            }

            if ($NoTestRes == 1 && $NoHPTestRes == 1) {
                echo "<tr>\n";
                echo "<td colspan='3'><center>".get_lang('NoResult')."</center></td>\n";
                echo "</tr>\n";
            }
            echo "</table>";
            echo "</td>\n</tr>\n";
        } else {
            $new_view = substr_replace($view,'1',1,1);
            echo "
                <tr>
                    <td valign='top'>
                        +<font color='#0000FF'>&nbsp;&nbsp;</font><a href='".api_get_self()."?uInfo=$user_id&view=".$new_view."' class='specialLink'>".get_lang('ExercicesResults')."</a>
                    </td>
                </tr>";
        }
    }

    /**
     * Displays the student publications for a specific user in a specific course.
     * @todo remove globals
     */
    function display_student_publications_tracking_info($view, $user_id, $course_id)
    {
        global $TABLETRACK_UPLOADS, $TABLECOURSE_WORK, $dateTimeFormatLong, $_course;
        if(substr($view,2,1) == '1') {
            $new_view = substr_replace($view,'0',2,1);
            echo "<tr>
                        <td valign='top'>
                        <font color='#0000FF'>-&nbsp;&nbsp;&nbsp;</font><b>".get_lang('WorkUploads')."</b>&nbsp;&nbsp;&nbsp;[<a href='".api_get_self()."?uInfo=".Security::remove_XSS($user_id)."&view=".Security::remove_XSS($new_view)."'>".get_lang('Close')."</a>]&nbsp;&nbsp;&nbsp;[<a href='userLogCSV.php?".api_get_cidreq()."&uInfo=".Security::remove_XSS($_GET['uInfo'])."&view=00100'>".get_lang('ExportAsCSV')."</a>]
                        </td>
                </tr>";
            echo "<tr><td style='padding-left : 40px;' valign='top'>".get_lang('WorksDetails')."<br>";
            $sql = "SELECT u.upload_date, w.title, w.author,w.url
                                FROM $TABLETRACK_UPLOADS u , $TABLECOURSE_WORK w
                                WHERE u.upload_work_id = w.id
                                    AND u.upload_user_id = '".Database::escape_string($user_id)."'
                                    AND u.upload_cours_id = '".Database::escape_string($course_id)."'
                                ORDER BY u.upload_date DESC";
            echo "<tr><td style='padding-left : 40px;padding-right : 40px;'>";
            $results = getManyResultsXCol($sql,4);
            echo "<table cellpadding='2' cellspacing='1' border='0' align=center>";
            echo "<tr>
                    <td class='secLine' width='40%'>
                    ".get_lang('WorkTitle')."
                    </td>
                    <td class='secLine' width='30%'>
                    ".get_lang('WorkAuthors')."
                    </td>
                    <td class='secLine' width='30%'>
                    ".get_lang('Date')."
                    </td>
                </tr>";
            if (is_array($results)) {
                for($j = 0 ; $j < count($results) ; $j++) {
                    $pathToFile = api_get_path(WEB_COURSE_PATH).$_course['path']."/".$results[$j][3];
                    $beautifulDate = api_convert_and_format_date($results[$j][0], null, date_default_timezone_get());
                    echo "<tr>";
                    echo "<td class='content'>"
                    ."<a href ='".$pathToFile."'>".$results[$j][1]."</a>"
                    ."</td>";
                    echo "<td class='content'>".$results[$j][2]."</td>";
                    echo "<td class='content'>".$beautifulDate."</td>";
                    echo"</tr>";
                }
            } else {
                echo "<tr>";
                echo "<td colspan='3'><center>".get_lang('NoResult')."</center></td>";
                echo"</tr>";
            }
            echo "</table>";
            echo "</td></tr>";
        } else {
            $new_view = substr_replace($view,'1',2,1);
            echo "
                <tr>
                        <td valign='top'>
                        +<font color='#0000FF'>&nbsp;&nbsp;</font><a href='".api_get_self()."?uInfo=".Security::remove_XSS($user_id)."&view=".Security::remove_XSS($new_view)."' class='specialLink'>".get_lang('WorkUploads')."</a>
                        </td>
                </tr>
            ";
        }
    }

    /**
     * Displays the links followed for a specific user in a specific course.
     * @todo remove globals
     */
    function display_links_tracking_info($view, $user_id, $course_id)
    {
        global $TABLETRACK_LINKS, $TABLECOURSE_LINKS;
        if(substr($view,3,1) == '1') {
            $new_view = substr_replace($view,'0',3,1);
            echo "
                <tr>
                        <td valign='top'>
                        <font color='#0000FF'>-&nbsp;&nbsp;&nbsp;</font><b>".get_lang('LinksAccess')."</b>&nbsp;&nbsp;&nbsp;[<a href='".api_get_self()."?uInfo=".Security::remove_XSS($user_id)."&view=".Security::remove_XSS($new_view)."'>".get_lang('Close')."</a>]&nbsp;&nbsp;&nbsp;[<a href='userLogCSV.php?".api_get_cidreq()."&uInfo=".Security::remove_XSS($_GET['uInfo'])."&view=00010'>".get_lang('ExportAsCSV')."</a>]
                        </td>
                </tr>
            ";
            echo "<tr><td style='padding-left : 40px;' valign='top'>".get_lang('LinksDetails')."<br>";
            $sql = "SELECT cl.title, cl.url
                        FROM $TABLETRACK_LINKS AS sl, $TABLECOURSE_LINKS AS cl
                        WHERE sl.links_link_id = cl.id
                            AND sl.links_cours_id = '".Database::escape_string($course_id)."'
                            AND sl.links_user_id = '".Database::escape_string($user_id)."'
                        GROUP BY cl.title, cl.url";
            echo "<tr><td style='padding-left : 40px;padding-right : 40px;'>";
            $results = getManyResults2Col($sql);
            echo "<table cellpadding='2' cellspacing='1' border='0' align=center>";
            echo "<tr>
                    <td class='secLine'>
                    ".get_lang('LinksTitleLinkColumn')."
                    </td>
                </tr>";
            if (is_array($results)) {
                for($j = 0 ; $j < count($results) ; $j++) {
                    echo "<tr>";
                    echo "<td class='content'><a href='".$results[$j][1]."'>".$results[$j][0]."</a></td>";
                    echo"</tr>";
                }
            } else {
                echo "<tr>";
                echo "<td ><center>".get_lang('NoResult')."</center></td>";
                echo"</tr>";
            }
            echo "</table>";
            echo "</td></tr>";
        } else {
            $new_view = substr_replace($view,'1',3,1);
            echo "
                <tr>
                        <td valign='top'>
                        +<font color='#0000FF'>&nbsp;&nbsp;</font><a href='".api_get_self()."?uInfo=".Security::remove_XSS($user_id)."&view=".Security::remove_XSS($new_view)."' class='specialLink'>".get_lang('LinksAccess')."</a>
                        </td>
                </tr>
            ";
        }
    }

    /**
     * Displays the documents downloaded for a specific user in a specific course.
     * @param     string    kind of view inside tracking info
     * @param    int        User id
     * @param    string    Course code
     * @param    int        Session id (optional, default = 0)
     * @return     void
     */
    function display_document_tracking_info($view, $user_id, $course_id, $session_id = 0) {

        // protect data
        $user_id     = intval($user_id);
        $course_id     = Database::escape_string($course_id);
        $session_id = intval($session_id);

        $downloads_table = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_DOWNLOADS);
        if(substr($view,4,1) == '1')
        {
            $new_view = substr_replace($view,'0',4,1);
            echo "
                <tr>
                        <td valign='top'>
                        <font color='#0000FF'>-&nbsp;&nbsp;&nbsp;</font><b>".get_lang('DocumentsAccess')."</b>&nbsp;&nbsp;&nbsp;[<a href='".api_get_self()."?uInfo=".Security::remove_XSS($user_id)."&view=".Security::remove_XSS($new_view)."'>".get_lang('Close')."</a>]&nbsp;&nbsp;&nbsp;[<a href='userLogCSV.php?".api_get_cidreq()."&uInfo=".Security::remove_XSS($_GET['uInfo'])."&view=00001'>".get_lang('ExportAsCSV')."</a>]
                        </td>
                </tr>
            ";
            echo "<tr><td style='padding-left : 40px;' valign='top'>".get_lang('DocumentsDetails')."<br>";

            $sql = "SELECT down_doc_path
                        FROM $downloads_table
                        WHERE down_cours_id = '".$course_id."'
                            AND down_user_id = '$user_id'
                            AND down_session_id = '$session_id'
                        GROUP BY down_doc_path";

            echo "<tr><td style='padding-left : 40px;padding-right : 40px;'>";
            $results = getManyResults1Col($sql);
            echo "<table cellpadding='2' cellspacing='1' border='0' align='center'>";
            echo "<tr>
                    <td class='secLine'>
                    ".get_lang('DocumentsTitleDocumentColumn')."
                    </td>
                </tr>";
            if (is_array($results)) {
                for($j = 0 ; $j < count($results) ; $j++) {
                    echo "<tr>";
                    echo "<td class='content'>".$results[$j]."</td>";
                    echo"</tr>";
                }
            } else {
                echo "<tr>";
                echo "<td><center>".get_lang('NoResult')."</center></td>";
                echo"</tr>";
            }
            echo "</table>";
            echo "</td></tr>";
        } else {
            $new_view = substr_replace($view,'1',4,1);
            echo "
                <tr>
                        <td valign='top'>
                        +<font color='#0000FF'>&nbsp;&nbsp;</font><a href='".api_get_self()."?uInfo=".Security::remove_XSS($user_id)."&view=".Security::remove_XSS($new_view)."' class='specialLink'>".get_lang('DocumentsAccess')."</a>
                        </td>
                </tr>
            ";
        }
    }



}

class TrackingUserLogCSV {

    /**
     * Displays the number of logins every month for a specific user in a specific course.
     */
    function display_login_tracking_info($view, $user_id, $course_id, $session_id = 0)
    {
        $MonthsLong = $GLOBALS['MonthsLong'];
        $track_access_table = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_ACCESS);

        // protected data
        $user_id    = intval($user_id);
        $session_id = intval($session_id);
        $course_id  = Database::escape_string($course_id);

        $tempView = $view;
        if(substr($view,0,1) == '1')
        {
            $new_view = substr_replace($view,'0',0,1);
            $title[1]= get_lang('LoginsAndAccessTools').get_lang('LoginsDetails');

            $sql = "SELECT UNIX_TIMESTAMP(access_date), count(access_date)
                        FROM $track_access_table
                        WHERE access_user_id = '$user_id'
                        AND access_cours_code = '".$course_id."'
                        AND access_session_id = '$session_id'
                        GROUP BY YEAR(access_date),MONTH(access_date)
                        ORDER BY YEAR(access_date),MONTH(access_date) ASC";

            //$results = getManyResults2Col($sql);
            $results = getManyResults3Col($sql);

            $title_line= get_lang('LoginsTitleMonthColumn').';'.get_lang('LoginsTitleCountColumn')."\n";
            $line='';
            $total = 0;
            if (is_array($results))
            {
                for($j = 0 ; $j < count($results) ; $j++)
                {
                    $line .= $results[$j][0].';'.$results[$j][1]."\n";
                    $total = $total + $results[$j][1];
                }
                $line .= get_lang('Total').";".$total."\n";
            }
            else
            {
                $line= get_lang('NoResult')."</center></td>";
            }
        }
        else
        {
            $new_view = substr_replace($view,'1',0,1);
        }
        return array($title_line, $line);
    }

    /**
     * Displays the exercise results for a specific user in a specific course.
     * @todo remove globals
     */
    function display_exercise_tracking_info($view, $user_id, $course_id) {
        global $TABLECOURSE_EXERCICES, $TABLETRACK_EXERCICES, $TABLETRACK_HOTPOTATOES, $dateTimeFormatLong;
        if (substr($view,1,1) == '1') {
            $new_view = substr_replace($view,'0',1,1);

            $title[1]= get_lang('ExercicesDetails');
            $line='';

            $sql = "SELECT ce.title, te.exe_result , te.exe_weighting, UNIX_TIMESTAMP(te.exe_date)
                FROM $TABLECOURSE_EXERCICES AS ce , $TABLETRACK_EXERCICES AS te
                WHERE te.exe_cours_id = '$course_id'
                    AND te.exe_user_id = '$user_id'
                    AND te.exe_exo_id = ce.id
                ORDER BY ce.title ASC, te.exe_date ASC";

            $hpsql = "SELECT te.exe_name, te.exe_result , te.exe_weighting, UNIX_TIMESTAMP(te.exe_date)
                FROM $TABLETRACK_HOTPOTATOES AS te
                WHERE te.exe_user_id = '$user_id' AND te.exe_cours_id = '$course_id'
                ORDER BY te.exe_cours_id ASC, te.exe_date ASC";

            $hpresults = getManyResultsXCol($hpsql, 4);

            $NoTestRes = 0;
            $NoHPTestRes = 0;

            $results = getManyResultsXCol($sql, 4);
            $title_line=get_lang('ExercicesTitleExerciceColumn').";".get_lang('Date').';'.get_lang('ExercicesTitleScoreColumn')."\n";

            if (is_array($results))
            {
                for($i = 0; $i < sizeof($results); $i++)
                {
                    $display_date = api_convert_and_format_date($results[$i][3], null, date_default_timezone_get());
                    $line .= $results[$i][0].";".$display_date.";".$results[$i][1]." / ".$results[$i][2]."\n";
                }
            }
            else // istvan begin
            {
                $NoTestRes = 1;
            }

            // The Result of Tests
            if(is_array($hpresults))
            {
                for($i = 0; $i < sizeof($hpresults); $i++)
                {
                    $title = GetQuizName($hpresults[$i][0],'');

                    if ($title == '')
                    $title = basename($hpresults[$i][0]);

                    $display_date = api_convert_and_format_date($hpresults[$i][3], null, date_default_timezone_get());

                    $line .= $title.';'.$display_date.';'.$hpresults[$i][1].'/'.$hpresults[$i][2]."\n";
                }
            }
            else
            {
                $NoHPTestRes = 1;
            }

            if ($NoTestRes == 1 && $NoHPTestRes == 1)
            {
                $line=get_lang('NoResult');
            }
        }
        else
        {
            $new_view = substr_replace($view,'1',1,1);

        }
        return array($title_line, $line);
    }

    /**
     * Displays the student publications for a specific user in a specific course.
     * @todo remove globals
     */
    function display_student_publications_tracking_info($view, $user_id, $course_id) {
        global $TABLETRACK_UPLOADS, $TABLECOURSE_WORK, $dateTimeFormatLong, $_course;
        if (substr($view,2,1) == '1') {
            $new_view = substr_replace($view,'0',2,1);
            $sql = "SELECT u.upload_date, w.title, w.author, w.url
                    FROM $TABLETRACK_UPLOADS u , $TABLECOURSE_WORK w
                    WHERE u.upload_work_id = w.id
                        AND u.upload_user_id = '$user_id'
                        AND u.upload_cours_id = '$course_id'
                    ORDER BY u.upload_date DESC";
            $results = getManyResultsXCol($sql,4);

            $title[1]=get_lang('WorksDetails');
            $line='';
            $title_line=get_lang('WorkTitle').";".get_lang('WorkAuthors').";".get_lang('Date')."\n";

            if (is_array($results)) {
                for($j = 0 ; $j < count($results) ; $j++) {
                    $pathToFile = api_get_path(WEB_COURSE_PATH).$_course['path']."/".$results[$j][3];
                    $beautifulDate = api_convert_and_format_date($results[$j][0], null, date_default_timezone_get());
                    $line .= $results[$j][1].";".$results[$j][2].";".$beautifulDate."\n";
                }

            } else {
                $line= get_lang('NoResult');
            }
        } else {
            $new_view = substr_replace($view,'1',2,1);
        }
        return array($title_line, $line);
    }

    /**
     * Displays the links followed for a specific user in a specific course.
     * @todo remove globals
     */
    function display_links_tracking_info($view, $user_id, $course_id) {
        global $TABLETRACK_LINKS, $TABLECOURSE_LINKS;
        if (substr($view,3,1) == '1') {
            $new_view = substr_replace($view,'0',3,1);
            $title[1]=get_lang('LinksDetails');
            $sql = "SELECT cl.title, cl.url
                        FROM $TABLETRACK_LINKS AS sl, $TABLECOURSE_LINKS AS cl
                        WHERE sl.links_link_id = cl.id
                            AND sl.links_cours_id = '$course_id'
                            AND sl.links_user_id = '$user_id'
                        GROUP BY cl.title, cl.url";
            $results = getManyResults2Col($sql);
            $title_line= get_lang('LinksTitleLinkColumn')."\n";
            if (is_array($results)) {
                for ($j = 0 ; $j < count($results) ; $j++) {
                        $line .= $results[$j][0]."\n";
                }
            } else {
                $line=get_lang('NoResult');
            }
        } else {
            $new_view = substr_replace($view,'1',3,1);
        }
        return array($title_line, $line);
    }

    /**
    * Displays the documents downloaded for a specific user in a specific course.
    * @param     string    kind of view inside tracking info
    * @param    int        User id
    * @param    string    Course code
    * @param    int        Session id (optional, default = 0)
    * @return     void
    */
    function display_document_tracking_info($view, $user_id, $course_id, $session_id = 0) {
        // protect data
        $user_id     = intval($user_id);
        $course_id     = Database::escape_string($course_id);
        $session_id = intval($session_id);

        $downloads_table = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_DOWNLOADS);

        if (substr($view,4,1) == '1') {
            $new_view = substr_replace($view,'0',4,1);
            $title[1]= get_lang('DocumentsDetails');

            $sql = "SELECT down_doc_path
                        FROM $downloads_table
                        WHERE down_cours_id = '$course_id'
                            AND down_user_id = '$user_id'
                            AND down_session_id = '$session_id'
                        GROUP BY down_doc_path";

            $results = getManyResults1Col($sql);
            $title_line = get_lang('DocumentsTitleDocumentColumn')."\n";
            if (is_array($results)) {
                for ($j = 0 ; $j < count($results) ; $j++) {
                        $line .= $results[$j]."\n";
                }
            } else {
                $line = get_lang('NoResult');
            }
        } else {
            $new_view = substr_replace($view,'1',4,1);
        }
        return array($title_line, $line);
    }
    
    
}