<?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
 */

// Language file that needs to be included.
$language_file = 'forum';

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

$htmlHeadXtra[] = '<script type="text/javascript" language="javascript">
    $(document).ready(function(){ $(\'.hide-me\').slideUp() });
    function hidecontent(content){ $(content).slideToggle(\'normal\'); }
    </script>';
$htmlHeadXtra[] = '<script type="text/javascript" language="javascript">

        function advanced_parameters() {
            if(document.getElementById(\'options\').style.display == \'none\') {
                    document.getElementById(\'options\').style.display = \'block\';
                    document.getElementById(\'plus_minus\').innerHTML=\'&nbsp;'.Display::return_icon('div_hide.gif',get_lang('Hide'),array('style'=>'vertical-align:middle')).'&nbsp;'.get_lang('AdvancedParameters').'\';
            } else {
                    document.getElementById(\'options\').style.display = \'none\';
                    document.getElementById(\'plus_minus\').innerHTML=\'&nbsp;'.Display::return_icon('div_show.gif',get_lang('Show'),array('style'=>'vertical-align:middle')).'&nbsp;'.get_lang('AdvancedParameters').'\';
            }
        }
    </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';


/* MAIN DISPLAY SECTION */

/* Header and Breadcrumbs */

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.'&amp;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'].'&amp;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']);
}

// Are we in a lp ?
$origin = '';
if (isset($_GET['origin'])) {
    $origin =  Security::remove_XSS($_GET['origin']);
}

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

/* ACTIONS */

$whatsnew_post_info = $_SESSION['whatsnew_post_info'];

/* 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 */

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

/* ACTIONS */

$action_forums = isset($_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;
        }
    }

    /* CLEAN GROUP ID FOR AJAXFILEMANAGER */

    if (isset($_SESSION['_gid'])) {
        unset($_SESSION['_gid']);
    }

    /* Display Forum Categories and the Forums in it */

    echo '<table class="forum_table" width="100%">';
    $my_session = isset($_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 = '';
    echo '<thead>';
    echo '<tr><th class="forum_head" '.(api_is_allowed_to_edit(null, true) ? 'colspan="5"' : 'colspan="6"').'>';

    echo '<a href="viewforumcategory.php?'.api_get_cidreq().'&amp;forumcategory='.strval(intval($forum_category['cat_id'])).'" '.class_visible_invisible(strval(intval($forum_category['visibility']))).'>'.prepare4display($forum_category['cat_title']).$session_displayed.'</a>'. $session_img .'<br />';

    echo '<span class="forum_description">'.prepare4display($forum_category['cat_comment']).'</span>';

    if (api_is_allowed_to_edit(false, true) && !($forum_category['session_id'] == 0 && intval($my_session) != 0)) {
        echo '<th style="vertical-align: top;" align="center">';
        echo '<a href="'.api_get_self().'?'.api_get_cidreq().'&amp;forumcategory='.Security::remove_XSS($_GET['forumcategory']).'&amp;action=edit&amp;content=forumcategory&amp;id='.$forum_category['cat_id'].'">'.Display::return_icon('edit.png', get_lang('Edit'), array(), ICON_SIZE_SMALL).'</a>';
        echo '<a href="'.api_get_self().'?'.api_get_cidreq().'&amp;forumcategory='.Security::remove_XSS($_GET['forumcategory']).'&amp;action=delete&amp;content=forumcategory&amp;amp;id='.$forum_category['cat_id']."\" 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>';
        display_visible_invisible_icon('forumcategory', $forum_category['cat_id'], $forum_category['visibility'], array('forumcategory' => $_GET['forumcategory']));
        display_lock_unlock_icon('forumcategory', $forum_category['cat_id'], $forum_category['locked'], array('forumcategory' => $_GET['forumcategory']));
        display_up_down_icon('forumcategory', $forum_category['cat_id'], $forum_categories_list);
        echo '</th>';
    }
    echo '</tr>';

    // 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>';


    // 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++;
                echo '<tr class="forum">';
                echo '<td width="20">';
                $my_whatsnew_post_info = isset($whatsnew_post_info[$forum['forum_id']]) ? $whatsnew_post_info[$forum['forum_id']] : null;
                if ($forum['forum_of_group'] !== '0') {
                    if (is_array($my_whatsnew_post_info) && !empty($my_whatsnew_post_info)) {
                        echo Display::return_icon('forumgroupnew.gif');
                    } else {
                        echo Display::return_icon('forumgroup.gif', get_lang('GroupForum'));
                    }
                } else {
                    if (is_array($my_whatsnew_post_info) && !empty($my_whatsnew_post_info)) {
                        echo Display::return_icon('forum.gif', get_lang('Forum'));
                    } else {
                        echo Display::return_icon('forum.gif');
                    }
                }
                echo '</td>';

                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);
                    $forum_title_group_addition = ' (<a href="../group/group_space.php?'.api_get_cidreq().'&amp;gidReq='.$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 {
                    $session_displayed = '';
                }
                echo '<td><a href="viewforum.php?'.api_get_cidreq().'&amp;gidReq='.$forum['forum_of_group'].'&amp;forum='.$forum['forum_id'].'&amp;origin='.$origin.'&amp;search='.Security::remove_XSS(urlencode(isset($_GET['search']) ? $_GET['search'] : '')).'" '.class_visible_invisible($forum['visibility']).'>'.prepare4display($forum['forum_title']).$session_displayed.'</a>'.$forum_title_group_addition.'<br />'.prepare4display($forum['forum_comment']).'</td>';

                //$number_forum_topics_and_posts=get_post_topics_of_forum($forum['forum_id']); // deprecated
                // the number of topics and posts
                $my_number_threads = isset($forum['number_of_threads']) ? $forum['number_of_threads'] : '';
                
                $my_number_posts = isset($forum['number_of_posts']) ? $forum['number_of_posts'] : '';
                echo '<td>'.$my_number_threads.'</td>';
                echo '<td>'.$my_number_posts.'</td>';
                // the last post in the forum
                if ($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 = $forum['last_poster_id'];
                }
                echo '<td>';
                if (!empty($forum['last_post_id'])) {
                    echo $forum['last_post_date'].' '.get_lang('By').' '.display_user_link($poster_id, $name);
                }
                echo '</td>';
                echo '<td class="td_actions">';

                if (api_is_allowed_to_edit(false, true) && !($forum['session_id'] == 0 && intval(isset($_SESSION['id_session']) ? $_SESSION['id_session'] : null) != 0)) {
                    echo '<a href="'.api_get_self().'?'.api_get_cidreq().'&amp;forumcategory='.Security::remove_XSS($_GET['forumcategory']).'&amp;action=edit&amp;content=forum&amp;id='.$forum['forum_id'].'">'.Display::return_icon('edit.png', get_lang('Edit'), array(), ICON_SIZE_SMALL).'</a>';
                    echo '<a href="'.api_get_self().'?'.api_get_cidreq().'&amp;forumcategory='.Security::remove_XSS($_GET['forumcategory']).'&amp;action=delete&amp;content=forum&amp;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>';
                    display_visible_invisible_icon('forum', $forum['forum_id'], $forum['visibility'], array('forumcategory' => $_GET['forumcategory']));
                    display_lock_unlock_icon('forum', $forum['forum_id'], $forum['locked'], array('forumcategory' => $_GET['forumcategory']));
                    display_up_down_icon('forum', $forum['forum_id'], $forums_in_category);
                }

                $iconnotify = 'send_mail.gif';
                if (is_array(isset($_SESSION['forum_notification']['forum']) ? $_SESSION['forum_notification']['forum'] : null)) {
                    if (in_array($forum['forum_id'],$_SESSION['forum_notification']['forum'])) {
                        $iconnotify = 'send_mail_checked.gif';
                    }
                }
                if (!api_is_anonymous()) {
                    echo '<a href="'.api_get_self().'?'.api_get_cidreq().'&amp;forumcategory='.Security::remove_XSS($_GET['forumcategory']).'&amp;action=notify&amp;content=forum&amp;id='.$forum['forum_id'].'">'.Display::return_icon($iconnotify, get_lang('NotifyMe')).'</a>';
                }
                echo '</td></tr>';
            }
        }
    }
    if (count($forum_list) == 0) {
        echo '<tr><td>'.get_lang('NoForumInThisCategory').'</td></tr>';
    }
    echo '</table>';
}

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