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

/**
 * These files are a complete rework of the forum. The database structure is
 * based on phpBB but all the code is rewritten. A lot of new functionalities
 * are added:
 * - forum categories and forums can be sorted up or down, locked or made invisible
 * - consistent and integrated forum administration
 * - forum options:     are students allowed to edit their post?
 *                      moderation of posts (approval)
 *                      reply only forums (students cannot create new threads)
 *                      multiple forums per group
 * - sticky messages
 * - new view option: nested view
 * - quoting a message
 *
 * @Author Patrick Cool <patrick.cool@UGent.be>, Ghent University
 * @Copyright Ghent University
 * @Copyright Patrick Cool
 *
 * @package chamilo.forum
 */

// Including the global initialization file.
require_once '../inc/global.inc.php';

$htmlHeadXtra[] = '<script>
$(document).ready(function(){
    $(\'.hide-me\').slideUp()
});

function hidecontent(content){
    $(content).slideToggle(\'normal\');
}
</script>';

// The section (tabs)
$this_section = SECTION_COURSES;

// Notification for unauthorized people.
api_protect_course_script(true);

// Including additional library scripts.
$nameTools = get_lang('ToolForum');

// Including necessary files
require 'forumconfig.inc.php';
require_once 'forumfunction.inc.php';

// Are we in a lp ?
$origin = '';

if (isset($_GET['origin'])) {
    $origin =  Security::remove_XSS($_GET['origin']);
}

/* Header and Breadcrumbs */
$gradebook = null;
if (isset($_SESSION['gradebook'])) {
    $gradebook=	$_SESSION['gradebook'];
}

if (!empty($gradebook) && $gradebook == 'view') {
    $interbreadcrumb[] = array (
        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
        'name' => get_lang('ToolGradebook')
    );
}

$current_forum_category = get_forum_categories($_GET['forumcategory']);
$interbreadcrumb[] = array(
    'url' => 'index.php?gradebook=' . $gradebook . '&search='
        . Security::remove_XSS(urlencode(isset($_GET['search']) ? $_GET['search'] : '')),
    'name' => get_lang('Forum')
);

if (!empty($_GET['action']) && !empty($_GET['content'])) {
    if ($_GET['action']=='add' && $_GET['content']=='forum' ) {
        $interbreadcrumb[] = array(
            'url' => 'viewforumcategory.php?forumcategory='
                . $current_forum_category['cat_id'] . '&origin=' . $origin,
            'name' => $current_forum_category['cat_title']
        );
        $interbreadcrumb[] = array(
            'url' =>'#',
            'name' => get_lang('AddForum')
        );
    }
} else {
    $interbreadcrumb[] = array(
        'url' => '#',
        'name' => $current_forum_category['cat_title']
    );
}

if ($origin=='learnpath') {
    Display::display_reduced_header();
} else {
    Display::display_header(null);
}

/* ACTIONS */
$whatsnew_post_info = isset($_SESSION['whatsnew_post_info']) ? $_SESSION['whatsnew_post_info'] : null;

/* Is the user allowed here? */

// if the user is not a course administrator and the forum is hidden
// then the user is not allowed here.
if (
    !api_is_allowed_to_edit(false, true) AND
    ( $current_forum_category && $current_forum_category['visibility'] == 0)
) {
    api_not_allowed();
}

/* Action Links */
$html  = '';
$html .= '<div class="actions">';
$html .= '<a href="index.php?gradebook='.$gradebook.'&'.api_get_cidreq().'">'.
    Display::return_icon('back.png', get_lang('BackToForumOverview'), '', ICON_SIZE_MEDIUM).'</a>';
if (api_is_allowed_to_edit(false,true)) {
    $html .= '<a href="' . api_get_self() . '?' . api_get_cidreq() . '&forumcategory='
        . $current_forum_category['cat_id'] . '&action=add&content=forum"> '
        . Display::return_icon('new_forum.png', get_lang('AddForum'), '', ICON_SIZE_MEDIUM) . '</a>';
}
$html .= search_link();
$html .= '</div>';

/* ACTIONS */
echo $html;

$action_forums = isset($_GET['action']) ? $_GET['action'] : '';
if (api_is_allowed_to_edit(false, true)) {
    handle_forum_and_forumcategories();
}

// Notification
if ($action_forums == 'notify' && isset($_GET['content']) && isset($_GET['id'])) {
    $return_message = set_notification($_GET['content'], $_GET['id']);
    Display::display_confirmation_message($return_message, false);
}

if ($action_forums != 'add') {
    /*
    RETRIEVING ALL THE FORUM CATEGORIES AND FORUMS
    Note: We do this here just after het handling of the actions to be sure that we already incorporate the
    latest changes.
    */
    // Step 1: We store all the forum categories in an array $forum_categories.
    $forum_categories = array();
    $forum_category = get_forum_categories($_GET['forumcategory']);

    // Step 2: We find all the forums.
    $forum_list = array();
    $forum_list = get_forums();

    /* RETRIEVING ALL GROUPS AND THOSE OF THE USER */

    // The groups of the user.
    $groups_of_user = array();
    $groups_of_user = GroupManager::get_group_ids($_course['real_id'], $_user['user_id']);
    // All groups in the course (and sorting them as the id of the group = the key of the array.
    $all_groups = GroupManager::get_group_list();
    if (is_array($all_groups)) {
        foreach ($all_groups as $group) {
            $all_groups[$group['id']] = $group;
        }
    }

    /* Display Forum Categories and the Forums in it */
    $html = '';
    $html .= '<div class="category-forum">';

    $my_session = isset($_SESSION['id_session']) ? $_SESSION['id_session'] : null;

    if (
        (!isset($_SESSION['id_session']) || $_SESSION['id_session'] == 0) &&
        !empty($forum_category['session_name'])
    ) {
        $session_displayed = ' ('.Security::remove_XSS($forum_category['session_name']).')';
    } else {
        $session_displayed = '';
    }
    $forum_categories_list = '';
    $forumId = $forum_category['cat_id'];
    $forumTitle = $forum_category['cat_title'];
    $linkForumCategory = 'viewforumcategory.php?' . api_get_cidreq() . '&forumcategory=' . strval(intval($forumId));
    $descriptionCategory = $forum_category['cat_comment'];
    $icoCategory = Display::return_icon(
        'forum_blue.png',
        get_lang($forum_category['cat_title']),
        array('class' => ''),
        ICON_SIZE_MEDIUM
    );

    if (api_is_allowed_to_edit(false, true) && !($forum_category['session_id'] == 0 && intval($my_session) != 0)) {

        $iconsEdit = '<a href="' . api_get_self() . '?' . api_get_cidreq() . '&forumcategory='
            . Security::remove_XSS($_GET['forumcategory']) . '&action=edit&content=forumcategory&id='
            . '' . $forumId . '">'
            . Display::return_icon('edit.png', get_lang('Edit'), array(), ICON_SIZE_SMALL) . '</a>';
        $iconsEdit .= '<a href="' . api_get_self() . '?' . api_get_cidreq() . '&forumcategory='
            . Security::remove_XSS($_GET['forumcategory'])
            . '&action=delete&content=forumcategory&id=' . $forumId
            . "\" onclick=\"javascript:if(!confirm('"
            . addslashes(api_htmlentities(get_lang('DeleteForumCategory'), ENT_QUOTES))
            . "')) return false;\">" . Display::return_icon('delete.png', get_lang('Delete'), array(), ICON_SIZE_SMALL)
            . '</a>';
        $iconsEdit .= return_visible_invisible_icon(
            'forumcategory', $forum_category['cat_id'],
            $forum_category['visibility'],
            array('forumcategory' => $_GET['forumcategory'])
        );
        $iconsEdit .= return_lock_unlock_icon(
            'forumcategory', $forum_category['cat_id'],
            $forum_category['locked'],
            array('forumcategory' => $_GET['forumcategory'])
        );
        $iconsEdit .= return_up_down_icon(
            'forumcategory', $forum_category['cat_id'],
            $forum_categories_list
        );
        $html .= Display::tag(
            'div',
            $iconsEdit,
            array('class' => 'pull-right')
        );
    }

    $session_img = api_get_session_image($forum_category['session_id'], $_user['status']);

    $html .= Display::tag(
        'h3',
        $icoCategory.
        Display::tag(
            'a',
            $forumTitle,
            array(
                'href'=>$linkForumCategory,
                'class'=>return_visible_invisible(strval(intval($forum_category['visibility'])))
            )
        ).$session_displayed.$session_img,
        null
    );


    if ($descriptionCategory != '' && trim($descriptionCategory)!= '&nbsp;')
    {
        $html .= '<div class="forum-description">'.$descriptionCategory.'</div>';
    }
    /* echo '<tr><th class="forum_head" '.(api_is_allowed_to_edit(null, true) ? 'colspan="5"' : 'colspan="6"').'>'; */


    // Step 3: The interim headers (for the forum).
    /*
    echo '<tr class="forum_header">';
    echo '<td colspan="2">'.get_lang('Forum').'</td>';
    echo '<td>'.get_lang('ForumThreads').'</td>';
    echo '<td>'.get_lang('Posts').'</td>';
    echo '<td>'.get_lang('LastPosts').'</td>';
    echo '<td>'.get_lang('Actions').'</td>';
    echo '</tr>';
    echo '</thead>';
    */

    $html .= '</div>';
    echo $html;

    echo '<div class="forum_display">';
    // The forums in this category.
    $forums_in_category = get_forums_in_category($forum_category['cat_id']);

    // Step 4: We display all the forums in this category.
    $forum_count = 0;
    foreach ($forum_list as $key => $forum) {
        if ($forum['forum_category'] == $forum_category['cat_id']) {
            // The forum has to be showed if
            // 1.v it is a not a group forum (teacher and student)
            // 2.v it is a group forum and it is public (teacher and student)
            // 3. it is a group forum and it is private (always for teachers only if the user is member of the forum
            // if the forum is private and it is a group forum and the user is not a member of the group forum then it cannot be displayed
            //if (!($forum['forum_group_public_private']=='private' AND !is_null($forum['forum_of_group']) AND !in_array($forum['forum_of_group'], $groups_of_user))) {
            $show_forum = false;
            // SHOULD WE SHOW THIS PARTICULAR FORUM
            // you are teacher => show forum

            if (api_is_allowed_to_edit(false,true)) {
                //echo 'teacher';
                $show_forum = true;
            } else {
                // you are not a teacher
                //echo 'student';
                // it is not a group forum => show forum (invisible forums are already left out see get_forums function)
                if ($forum['forum_of_group'] == '0') {
                    //echo '-gewoon forum';
                    $show_forum = true;
                } else {
                    // it is a group forum
                    //echo '-groepsforum';
                    // it is a group forum but it is public => show
                    if ($forum['forum_group_public_private'] == 'public') {
                        $show_forum = true;
                        //echo '-publiek';
                    } else {
                        // it is a group forum and it is private
                        //echo '-prive';
                        // it is a group forum and it is private but the user is member of the group
                        if (in_array($forum['forum_of_group'], $groups_of_user)) {
                            //echo '-is lid';
                            $show_forum = true;
                        } else {
                            //echo '-is GEEN lid';
                            $show_forum = false;
                        }
                    }

                }
            }
            //echo '<hr />';
            $form_count = isset($form_count) ? $form_count : 0;
            if ($show_forum === true) {
                $form_count++;

                $html = '<div class="panel panel-default forum">';
                $html .= '<div class="panel-body">';

                $my_whatsnew_post_info = isset($whatsnew_post_info[$forum['forum_id']]) ? $whatsnew_post_info[$forum['forum_id']] : null;


                if ($forum['forum_of_group'] == '0') {
                    $forum_image = Display::return_icon(
                        'forum_group.png',
                        get_lang('GroupForum'),
                        null,
                        ICON_SIZE_LARGE
                    );

                } else {
                    $forum_image = Display::return_icon(
                        'forum.png',
                        get_lang('Forum'),
                        null,
                        ICON_SIZE_LARGE
                    );
                }

                if ($forum['forum_of_group'] != '0') {
                    $my_all_groups_forum_name = isset($all_groups[$forum['forum_of_group']]['name'])
                        ? $all_groups[$forum['forum_of_group']]['name']
                        : null;
                    $my_all_groups_forum_id = isset($all_groups[$forum['forum_of_group']]['id'])
                        ? $all_groups[$forum['forum_of_group']]['id']
                        : null;
                    $group_title = api_substr($my_all_groups_forum_name, 0, 30);
                    $forum_title_group_addition = ' (<a href="../group/group_space.php?' . api_get_cidreq()
                        . '&gidReq=' . $my_all_groups_forum_id . '" class="forum_group_link">'
                        . get_lang('GoTo') . ' ' . $group_title . '</a>)';
                } else {
                    $forum_title_group_addition = '';
                }

                if ((!isset($_SESSION['id_session']) || $_SESSION['id_session'] == 0) && !empty($forum['session_name'])) {
                    $session_displayed = ' ('.$forum['session_name'].')';
                } else {
                    $session_displayed = '';
                }

                //$number_forum_topics_and_posts=get_post_topics_of_forum($forum['forum_id']); // deprecated
                // the number of topics and posts
                $my_number_threads = isset($forum['number_of_threads']) ? $forum['number_of_threads'] : 0 ;

                $my_number_posts = isset($forum['number_of_posts']) ? $forum['number_of_posts'] : 0 ;

                $html .= '<div class="row">';
                $html .= '<div class="col-md-6">';
                $html .= '<div class="col-md-3">';
                $html .= '<div class="number-post">'.$forum_image .'<p>' . $my_number_posts . ' ' . get_lang('Posts') . '</p></div>';
                $html .= '</div>';

                $html .= '<div class="col-md-9">';
                $iconForum = Display::return_icon(
                    'forum_yellow.png',
                    get_lang($forum_category['cat_title']),
                    null,
                    ICON_SIZE_MEDIUM
                );
                $linkForum = '';
                $linkForum .= Display::tag(
                    'a',
                    $forum['forum_title'].$session_displayed,
                    array(
                        'href' => 'viewforum.php?' . api_get_cidreq()
                            . "&gidReq={$forum['forum_of_group']}&forum={$forum['forum_id']}&origin=$origin&search="
                            . Security::remove_XSS(urlencode(isset($_GET['search']) ? $_GET['search'] : '')),
                        'class' => return_visible_invisible($forum['visibility'])
                    )
                );
                $html .= Display::tag(
                    'h3',
                    $linkForum . ' ' . $forum_title_group_addition,
                    array(
                        'class' => 'title'
                    )
                );
                $html .= Display::tag(
                    'p',
                    strip_tags($forum['forum_comment']),
                    array(
                        'class' => 'description'
                    )
                );
                $html .= '</div>';
                $html .= '</div>';
                $html .= '<div class="col-md-6">';

                $iconEmpty='';

                // The number of topics and posts.
                if ($forum['forum_of_group'] !== '0') {
                    $newPost='';
                    if (is_array($my_whatsnew_post_info) && !empty($my_whatsnew_post_info)) {
                        $newPost = ' ' . Display::return_icon('alert.png', get_lang('Forum'), null, ICON_SIZE_SMALL);
                    } else {
                        $newPost = $iconEmpty;
                    }
                } else {
                    if (is_array($my_whatsnew_post_info) && !empty($my_whatsnew_post_info)) {
                        $newPost = ' ' . Display::return_icon('alert.png', get_lang('Forum'), null, ICON_SIZE_SMALL);
                    } else {
                        $newPost = $iconEmpty;
                    }
                }

                $html .= '<div class="row">';
                $html .= '<div class="col-md-2">';
                $html .= Display::return_icon('post-forum.png', null, null, ICON_SIZE_SMALL);
                $html .= ' ' . $my_number_threads . '<br>' . $newPost . '</div>';

                // the last post in the forum
                if ($forum['last_poster_name'] != '') {
                    $name = $forum['last_poster_name'];
                    $poster_id = 0;
                } else {
                    $name = api_get_person_name($forum['last_poster_firstname'], $forum['last_poster_lastname']);
                    $poster_id = $forum['last_poster_id'];
                }
                $html .= '<div class="col-md-6">';
                if (!empty($forum['last_post_id'])) {
                    $html .= Display::return_icon('post-item.png', null, null, ICON_SIZE_TINY) . ' ';
                    $html .= api_convert_and_format_date($forum['last_post_date'])
                        . ' ' . get_lang('By') . ' '
                        . display_user_link($poster_id, $name);
                }
                $html .= '</div>';
                $html .= '<div class="col-md-4">';

                if (
                    api_is_allowed_to_edit(false, true) &&
                    !($forum['session_id'] == 0 &&
                    intval(isset($_SESSION['id_session']) ? $_SESSION['id_session'] : null) != 0)
                ) {
                    $html .= '<a href="' . api_get_self() . '?' . api_get_cidreq() . '&forumcategory='
                        . Security::remove_XSS($_GET['forumcategory'])
                        . '&action=edit&content=forum&id=' . $forum['forum_id'] . '">'
                        . Display::return_icon('edit.png', get_lang('Edit'), array(), ICON_SIZE_SMALL) . '</a>';
                    $html .= '<a href="' . api_get_self() . '?' . api_get_cidreq() . '&forumcategory='
                        . Security::remove_XSS($_GET['forumcategory'])
                        . '&action=delete&content=forum&id=' . $forum['forum_id']
                        . "\" onclick=\"javascript:if(!confirm('"
                        . addslashes(api_htmlentities(get_lang('DeleteForum'), ENT_QUOTES))
                        . "')) return false;\">"
                        . Display::return_icon('delete.png', get_lang('Delete'), array(), ICON_SIZE_SMALL)
                        . '</a>';
                    $html .= return_visible_invisible_icon(
                        'forum',
                        $forum['forum_id'],
                        $forum['visibility'],
                        array('forumcategory' => $_GET['forumcategory'])
                    );
                    $html .= return_lock_unlock_icon(
                        'forum',
                        $forum['forum_id'],
                        $forum['locked'],
                        array('forumcategory' => $_GET['forumcategory'])
                    );
                    $html .= return_up_down_icon('forum', $forum['forum_id'], $forums_in_category);
                }

                $iconnotify = 'notification_mail_na.png';
                if (is_array(isset($_SESSION['forum_notification']['forum']) ? $_SESSION['forum_notification']['forum'] : null)) {
                    if (in_array($forum['forum_id'],$_SESSION['forum_notification']['forum'])) {
                        $iconnotify = 'notification_mail.png';
                    }
                }
                if (!api_is_anonymous()) {
                    $html .= '<a href="' . api_get_self() . '?' . api_get_cidreq() . '&forumcategory='
                        . Security::remove_XSS($_GET['forumcategory']) . '&action=notify&content=forum&id='
                        . $forum['forum_id'] . '">' . Display::return_icon($iconnotify, get_lang('NotifyMe')) . '</a>';
                }
                $html .= '</div>';
                $html .= '</div>';

                $html .= '</div>';
                $html .= '</div>';

                $html .= '</div></div>';
            }
           echo $html;
        }
    }
    if (count($forum_list) == 0) {
        echo '<div class="alert alert-warning">'.get_lang('NoForumInThisCategory').'</div>';
    }

    echo '</div>';
}

/* FOOTER */
if ($origin != 'learnpath') {
    Display::display_footer();
}