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

use ChamiloSession as Session;

/**
 * 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
 */

$current_course_tool = TOOL_FORUM;
$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);

$nameTools = get_lang('Forums');
$_course = api_get_course_info();
$sessionId = api_get_session_id();
$_user = api_get_user_info();

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

if (api_is_in_gradebook()) {
    $interbreadcrumb[]= array(
        'url' => api_get_path(WEB_CODE_PATH).'gradebook/index.php?'.api_get_cidreq(),
        'name' => get_lang('ToolGradebook')
    );
}

$search_forum = isset($_GET['search']) ? Security::remove_XSS($_GET['search']) : '';

/* ACTIONS */

$actions = isset($_GET['action']) ? $_GET['action'] : '';

if ($actions === 'add') {
    switch ($_GET['content']) {
        case 'forum':
            $interbreadcrumb[] = array(
                'url' => 'index.php?search=' . $search_forum . '&' . api_get_cidreq(),
                'name' => get_lang('Forum'),
            );
            $interbreadcrumb[] = array(
                'url' => '#',
                'name' => get_lang('AddForum'),
            );
            break;
        case 'forumcategory':
            $interbreadcrumb[] = array(
                'url' => 'index.php?search=' . $search_forum . '&' . api_get_cidreq(),
                'name' => get_lang('Forum'),
            );
            $interbreadcrumb[] = array(
                'url' => '#',
                'name' => get_lang('AddForumCategory'),
            );
            break;
        default:
            break;
    }
} else {
    $interbreadcrumb[] = array(
        'url' => '#',
        'name' => get_lang('ForumCategories'),
    );
}

Display::display_header('');

// Tool introduction
Display::display_introduction_section(TOOL_FORUM);

$form_count = 0;

if (api_is_allowed_to_edit(false, true)) {
    //if is called from a learning path lp_id
    $lp_id = isset($_REQUEST['lp_id']) ? intval($_REQUEST['lp_id']) : null;
    handle_forum_and_forumcategories($lp_id);
}

// Notification
if ($actions == 'notify' && isset($_GET['content']) && isset($_GET['id'])) {
    if (
        api_get_session_id() != 0 &&
        api_is_allowed_to_session_edit(false, true) == false
    ) {
        api_not_allowed();
    }
    $return_message = set_notification($_GET['content'], $_GET['id']);
    Display:: display_confirmation_message($return_message, false);
}

get_whats_new();

$whatsnew_post_info = Session::read('whatsnew_post_info');

/* TRACKING */

Event::event_access_tool(TOOL_FORUM);

/*
    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.
$forumCategories = get_forum_categories();

// Step 2: We find all the forums (only the visible ones if it is a student).
// display group forum in general forum tool depending to configuration option
$setting = api_get_setting('forum.display_groups_forum_in_general_tool');

$forum_list = get_forums('', '', $setting === 'true');
$user_id = api_get_user_id();

/* 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_id);

// All groups in the course (and sorting them as the
// id of the group = the key of the array).
if (!api_is_anonymous()) {
    $all_groups = GroupManager::get_group_list();
    if (is_array($all_groups)) {
        foreach ($all_groups as $group) {
            $all_groups[$group['id']] = $group;
        }
    }
}

/* ACTION LINKS */
echo '<div class="actions">';
//if is called from learning path
if (!empty($_GET['lp_id']) || !empty($_POST['lp_id'])) {
    echo "<a href=\"../lp/lp_controller.php?"
        . api_get_cidreq()
        . "&gradebook=&action=add_item&type=step&lp_id=$lp_id#resource_tab-5\">"
        . Display::return_icon(
            'back.png',
            get_lang("BackTo") . ' ' . get_lang("LearningPaths"),
            '',
            ICON_SIZE_MEDIUM
        )
        . "</a>";
}
if (!empty($forum_list)) {
    echo search_link();
}

if (api_is_allowed_to_edit(false, true)) {
    echo '<a href="'
        . api_get_self() . '?' . api_get_cidreq()
        . '&action=add&content=forumcategory&lp_id=' . $lp_id . '"> ' .
        Display::return_icon(
            'new_folder.png', get_lang('AddForumCategory'), '', ICON_SIZE_MEDIUM
        )
        . '</a>';

    if (is_array($forumCategories) && !empty($forumCategories)) {
        echo '<a href="'.api_get_self().'?'.api_get_cidreq(
            ).'&action=add&content=forum&lp_id='.$lp_id.'"> '.
            Display::return_icon(
                'new_forum.png',
                get_lang('AddForum'),
                '',
                ICON_SIZE_MEDIUM
            ).'</a>';
    }
}

echo '</div>';

// Fixes error if there forums with no category.
$forumsInNoCategory = get_forums_in_category(0);
if (!empty($forumsInNoCategory)) {
    $forumCategories = array_merge(
        $forumCategories,
        array(
            array(
                'cat_id' => 0,
                'session_id' => 0,
                'visibility' => 1,
                'cat_comment' => null
            )
        )
    );
}

/* Display Forum Categories and the Forums in it */
// Step 3: We display the forum_categories first.
if (is_array($forumCategories)) {
    foreach ($forumCategories as $forumCategory) {
        // The forums in this category.
        $forumsInCategory = get_forums_in_category($forumCategory['cat_id']);

        // Validation when belongs to a session.
        $session_img = api_get_session_image(
            $forumCategory['session_id'],
            $_user['status']
        );

        if (empty($sessionId) && !empty($forumCategory['session_name'])) {
            $session_displayed = ' (' . Security::remove_XSS($forumCategory['session_name']) . ')';
        } else {
            $session_displayed = '';
        }

        if (empty($forumCategory['cat_title'])) {
            $forumCategory['cat_title'] = get_lang('WithoutCategory');
        }

        $html = '';
        $iconsEdit = '';
        $idCategory = $forumCategory['cat_id'];
        $urlCategory = 'viewforumcategory.php?' . api_get_cidreq() . '&forumcategory=' . intval($idCategory);
        $titleCategory = Display::tag(
            'a',
            $forumCategory['cat_title'],
            array(
                'href' => $urlCategory,
                'class' => empty($forumCategory['visibility']) ? 'text-muted' : null
            )
        );

        $descriptionCategory = $forumCategory['cat_comment'];

        if (!empty($idCategory)) {
            if (
                api_is_allowed_to_edit(false, true) &&
                !($forumCategory['session_id'] == 0 &&
                intval($sessionId) != 0)
            ) {
                $iconsEdit .= '<a href="' . api_get_self() . '?' . api_get_cidreq()
                    . '&action=edit&content=forumcategory&id=' . intval($idCategory)
                    . '">' . Display::return_icon(
                        'edit.png',
                        get_lang('Edit'),
                        array(),
                        ICON_SIZE_SMALL
                    )
                    . '</a>';

                $iconsEdit .='<a href="' . api_get_self() . '?' . api_get_cidreq()
                    . '&action=delete&content=forumcategory&id=' . intval($idCategory)
                    . "\" 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>';
                $iconsEdit .=  return_visible_invisible_icon(
                    'forumcategory',
                    strval(intval($idCategory)),
                    strval(intval($forumCategory['visibility']))
                );
                $iconsEdit .= return_lock_unlock_icon(
                    'forumcategory',
                    strval(intval($idCategory)),
                    strval(intval($forumCategory['locked']))
                );
                $iconsEdit .= return_up_down_icon(
                    'forumcategory',
                    strval(intval($idCategory)),
                    $forumCategories
                );
            }
        }

        $html .= '<div class="category-forum">';
        $html .= Display::tag(
            'div',
            $iconsEdit,
            array(
                'class' => 'pull-right'
            )
        );
        $icoCategory = Display::return_icon(
            'forum_blue.png',
            get_lang(
                $forumCategory['cat_title']
            ),
            array(),
            ICON_SIZE_MEDIUM
        );
        $html .= '<h3>' . $icoCategory . $titleCategory . '</h3>';

        if ($descriptionCategory != '' && trim($descriptionCategory) != '&nbsp;') {
            $html .= '<div class="forum-description">'.$descriptionCategory.'</div>';
        }

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

        echo '<div class="forum_display">';
        if (!empty($forumsInCategory)) {
            // We display all the forums in this category.
            foreach ($forum_list as $forum) {
                // Here we clean the whatnew_post_info array a little bit because to display the icon we
                // test if $whatsnew_post_info[$forum['forum_id']] is empty or not.
                if (isset($forum['forum_id'])) {
                    if (!empty($whatsnew_post_info)) {
                        if (
                            isset($whatsnew_post_info[$forum['forum_id']]) &&
                            is_array($whatsnew_post_info[$forum['forum_id']])
                        ) {
                            foreach ($whatsnew_post_info[$forum['forum_id']] as $key_thread_id => $new_post_array) {
                                if (empty($whatsnew_post_info[$forum['forum_id']][$key_thread_id])) {
                                    unset($whatsnew_post_info[$forum['forum_id']][$key_thread_id]);
                                    unset($_SESSION['whatsnew_post_info'][$forum['forum_id']][$key_thread_id]);
                                }
                            }
                        }
                    }
                }

                // Note: This can be speed up if we transform the $forum_list
                // to an array that uses the forum_category as the key.
                if (
                    isset($forum['forum_category']) &&
                    $forum['forum_category'] == $forumCategory['cat_id']
                ) {
                    $show_forum = false;

                    // SHOULD WE SHOW THIS PARTICULAR FORUM
                    // you are teacher => show forum
                    if (api_is_allowed_to_edit(false, true)) {
                        $show_forum = true;
                    } else {
                        // you are not a teacher
                        // it is not a group forum => show forum
                        // (invisible forums are already left out see get_forums function)
                        if ($forum['forum_of_group'] == '0') {
                            $show_forum = true;
                        } else {
                            $show_forum = GroupManager::user_has_access(
                                $user_id,
                                $forum['forum_of_group'],
                                GroupManager::GROUP_TOOL_FORUM
                            );
                        }
                    }

                    if ($show_forum) {
                        $form_count++;
                        $mywhatsnew_post_info = isset($whatsnew_post_info[$forum['forum_id']]) ?
                            $whatsnew_post_info[$forum['forum_id']] : null;

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

                        $forum_image = '';
                        $imgForum = '';
                        // Showing the image
                        if (!empty($forum['forum_image'])) {
                            $image_path = api_get_path(WEB_COURSE_PATH). api_get_course_path(). '/upload/forum/images/'. $forum['forum_image'];
                            $image_size = api_getimagesize($image_path);
                            $img_attributes = '';
                            if (!empty($image_size)) {
                                //limit display width and height to 100px
                                $img_attributes = ' style="width:80px" height="80px"';
                                $imgForum = "<img src=\"$image_path\" $img_attributes>";
                            } else {
                                $imgForum = '';
                            }

                            $forum_image = $imgForum;
                        } else {
                            if ($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
                                );
                            }
                        }

                        // Validation when belongs to a session
                        $session_img = api_get_session_image(
                            $forum['session_id'],
                            $_user['status']
                        );

                        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=' . $forum['forum_of_group']
                                . '" class="forum_group_link">' . get_lang('GoTo') . ' ' . $group_title . '</a>)'
                                . $session_img;
                        } else {
                            $forum_title_group_addition = '';
                        }

                        if (empty($sessionId) && !empty($forum['session_name'])) {
                            $session_displayed = ' (' . $forum['session_name'] . ')';
                        } else {
                            $session_displayed = '';
                        }
                        $forum['forum_of_group'] == 0 ? $groupid = '' : $groupid = $forum['forum_of_group'];

                        $number_threads = isset($forum['number_of_threads']) ? (int) $forum['number_of_threads'] : 0;
                        $number_posts = isset($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>'.$number_threads.' ' . get_lang('ForumThreads') . '</p>'
                            . '</div>';
                        $html .= '</div>';

                        $html .= '<div class="col-md-9">';
                        $iconForum = Display::return_icon(
                            'forum_yellow.png',
                            get_lang($forumCategory['cat_title']),
                            null,
                            ICON_SIZE_MEDIUM
                        );

                        $linkForum = Display::tag(
                            'a',
                            $forum['forum_title'],
                            [
                                'href' => 'viewforum.php?' . api_get_cidreq()
                                    . '&gidReq=' . intval($groupid)
                                    . '&forum=' . intval($forum['forum_id']),
                                'class' => empty($forum['visibility']) ? 'text-muted' : null
                            ]
                        );

                        if (!empty($forum['start_time']) && !empty($forum['end_time'])) {
                            $res = api_is_date_in_date_range($forum['start_time'], $forum['end_time']);
                            if (!$res) {
                                $linkForum = $forum['forum_title'];
                            }
                        }

                        $html .= '<h3 class="title">' . $iconForum . $linkForum . '</h3>';
                        $html .= Display::tag(
                            'p',
                            Security::remove_XSS($forum['forum_comment']),
                            [
                                'class'=>'description'
                            ]
                        );
                        $html .= '</div>';
                        $html .= '</div>';

                        $iconEmpty = '';

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

                        $html .= '<div class="col-md-6">';
                        $html .= '<div class="row">';
                        $html .= '<div class="col-md-2">';
                        $html .= $newPost.'</div>';
                        $html .= '<div class="col-md-6">';

                        // The last post in the forum.
                        if (isset($forum['last_poster_name']) && $forum['last_poster_name'] != '') {
                            $name = $forum['last_poster_name'];
                            $poster_id = 0;
                            $username = "";
                        } else {
                            if (isset($forum['last_poster_firstname'])) {
                                $name = api_get_person_name(
                                    $forum['last_poster_firstname'],
                                    $forum['last_poster_lastname']
                                );
                                $poster_id = $forum['last_poster_id'];
                                $userinfo = api_get_user_info($poster_id);
                                $username = sprintf(
                                    get_lang('LoginX'),
                                    $userinfo['username']
                                );
                            }
                        }

                        if (!empty($forum['last_post_id'])) {
                            $html .= Display::return_icon(
                                    'post-item.png',
                                    null,
                                    null,
                                    ICON_SIZE_TINY
                                )
                                . ' ' .
                                api_convert_and_format_date($forum['last_post_date'])
                                . '<br /> ' . get_lang('By') . ' ' .
                                display_user_link(
                                    $poster_id,
                                    $name,
                                    '',
                                    $username
                                );
                        }
                        $html .= '</div>';
                        $html .= '<div class="col-md-4">';

                        if (api_is_allowed_to_edit(false, true) &&
                            !($forum['session_id'] == 0 && intval($sessionId) != 0)
                        ) {
                            $html .= '<a href="'.api_get_self() . '?' . api_get_cidreq()
                                . '&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()
                                . '&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']
                            );

                            $html .= return_lock_unlock_icon(
                                'forum',
                                $forum['forum_id'],
                                $forum['locked']
                            );

                            $html .= return_up_down_icon(
                                'forum',
                                $forum['forum_id'],
                                $forumsInCategory
                            );
                        }
                        $iconnotify = 'notification_mail_na.png';
                        $session_forum_notification = isset($_SESSION['forum_notification']['forum']) ?
                            $_SESSION['forum_notification']['forum'] : false;
                        if (is_array($session_forum_notification)) {
                            if (in_array(
                                $forum['forum_id'],
                                $session_forum_notification
                            )) {
                                $iconnotify = 'notification_mail.png';
                            }
                        }

                        if (
                            !api_is_anonymous() &&
                            api_is_allowed_to_session_edit(false, true)
                        ) {
                            $html .= '<a href="' . api_get_self() . '?' . api_get_cidreq()
                                . '&action=notify&content=forum&id=' . $forum['forum_id'] . '">'
                                . Display::return_icon($iconnotify, get_lang('NotifyMe'), null, ICON_SIZE_SMALL)
                                . '</a>';
                        }

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

                        $html .= '</div>';
                        $html .= '</div>';
                        $html .= '</div>';
                    }
                    echo $html;
                }
            }
        } else {
            echo '<div class="alert alert-warning">' . get_lang('NoForumInThisCategory') . '</div>'
                . (api_is_allowed_to_edit(false, true) ? '<div>' : '</div>')
                . '</div>';
        }

        echo '</div>';
    }
}
Display:: display_footer();