<?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
 *
 * @package chamilo.forum
 */

require_once __DIR__.'/../inc/global.inc.php';

$this_section = SECTION_COURSES;

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

$nameTools = get_lang('ForumCategories');
$origin = api_get_origin();

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

$forumId = isset($_GET['forum']) ? (int) $_GET['forum'] : 0;
$threadId = isset($_GET['thread']) ? (int) $_GET['thread'] : 0;

/* MAIN DISPLAY SECTION */

/* Retrieving forum and forum categorie information */
// We are getting all the information about the current forum and forum category.
// Note pcool: I tried to use only one sql statement (and function) for this,
// but the problem is that the visibility of the forum AND forum cateogory are stored in the item_property table.
$current_thread = get_thread_information($forumId, $threadId); // Note: This has to be validated that it is an existing thread.
$current_forum = get_forum_information($current_thread['forum_id']); // Note: This has to be validated that it is an existing forum.
$current_forum_category = get_forumcategory_information(Security::remove_XSS($current_forum['forum_category']));

/* Is the user allowed here? */
// The user is not allowed here if
// 1. the forumcategory, forum or thread is invisible (visibility==0
// 2. the forumcategory, forum or thread is locked (locked <>0)
// 3. if anonymous posts are not allowed
// The only exception is the course manager
// I have split this is several pieces for clarity.
if (!api_is_allowed_to_edit(false, true) &&
    (($current_forum_category && $current_forum_category['visibility'] == 0) || $current_forum['visibility'] == 0)
) {
    api_not_allowed(true);
}
if (!api_is_allowed_to_edit(false, true) &&
    (($current_forum_category && $current_forum_category['locked'] <> 0) || $current_forum['locked'] <> 0 || $current_thread['locked'] <> 0)
) {
    api_not_allowed(true);
}
if (!$_user['user_id'] && $current_forum['allow_anonymous'] == 0) {
    api_not_allowed(true);
}

if ($current_forum['forum_of_group'] != 0) {
    $show_forum = GroupManager::user_has_access(
        api_get_user_id(),
        $current_forum['forum_of_group'],
        GroupManager::GROUP_TOOL_FORUM
    );
    if (!$show_forum) {
        api_not_allowed();
    }
}

/* Breadcrumbs */

$gradebook = null;
if (isset($_SESSION['gradebook'])) {
    $gradebook = Security::remove_XSS($_SESSION['gradebook']);
}

if (!empty($gradebook) && $gradebook == 'view') {
    $interbreadcrumb[] = array(
        'url' => '../gradebook/'.Security::remove_XSS($_SESSION['gradebook_dest']),
        'name' => get_lang('ToolGradebook')
    );
}
$groupId = api_get_group_id();
if (!empty($groupId)) {
    $_clean['toolgroup'] = $groupId;
    $group_properties = GroupManager :: get_group_properties($_clean['toolgroup']);
    $interbreadcrumb[] = array(
        'url' => api_get_path(WEB_CODE_PATH).'group/group.php?'.api_get_cidreq(),
        'name' => get_lang('Groups'),
    );

    $interbreadcrumb[] = array(
        'url' => api_get_path(WEB_CODE_PATH).'group/group_space.php?'.api_get_cidreq(),
        'name' => get_lang('GroupSpace').' '.$group_properties['name']
    );

    $interbreadcrumb[] = array(
        'url' => api_get_path(WEB_CODE_PATH).'forum/viewforum.php?forum='.$forumId.'&'.api_get_cidreq(),
        'name' => $current_forum['forum_title']
    );
    $interbreadcrumb[] = array(
        'url' => api_get_path(WEB_CODE_PATH).'forum/viewthread.php?gradebook='.$gradebook.'&forum='.$forumId.'&thread='.$threadId.'&'.api_get_cidreq(),
        'name' => $current_thread['thread_title']
    );

    $interbreadcrumb[] = array(
        'url' => 'javascript: void(0);',
        'name' => get_lang('Reply'),
    );
} else {
    $interbreadcrumb[] = array(
        'url' => 'index.php?gradebook='.$gradebook,
        'name' => $nameTools
    );
    $interbreadcrumb[] = array(
        'url' => api_get_path(WEB_CODE_PATH).'forum/viewforumcategory.php?forumcategory='.$current_forum_category['cat_id'].'&'.api_get_cidreq(),
        'name' => $current_forum_category['cat_title']
    );
    $interbreadcrumb[] = array(
        'url' => api_get_path(WEB_CODE_PATH).'forum/viewforum.php?forum='.$forumId.'&'.api_get_cidreq(),
        'name' => $current_forum['forum_title']
    );
    $interbreadcrumb[] = array(
        'url' => api_get_path(WEB_CODE_PATH).'forum/viewthread.php?gradebook='.$gradebook.'&forum='.$forumId.'&thread='.$threadId.'&'.api_get_cidreq(),
        'name' => $current_thread['thread_title']
    );
    $interbreadcrumb[] = array('url' => '#', 'name' => get_lang('Reply'));
}

/* Header */
$htmlHeadXtra[] = <<<JS
    <script>
    $(document).on('ready', function() {
        $('#reply-add-attachment').on('click', function(e) {
            e.preventDefault();

            var newInputFile = $('<input>', {
                type: 'file',
                name: 'user_upload[]'
            });

            $('[name="user_upload[]"]').parent().append(newInputFile);
        });
    });
    </script>
JS;

/* End new display forum */
// The form for the reply
$my_action = isset($_GET['action']) ? Security::remove_XSS($_GET['action']) : '';
$my_post = isset($_GET['post']) ? Security::remove_XSS($_GET['post']) : '';
$my_elements = isset($_SESSION['formelements']) ? $_SESSION['formelements'] : '';

$form = show_add_post_form(
    $current_forum,
    $forum_setting,
    $my_action,
    $my_post,
    $my_elements
);

if ($origin == 'learnpath') {
    Display::display_reduced_header();
} else {
    // The last element of the breadcrumb navigation is already set in interbreadcrumb, so give an empty string.
    Display::display_header();
}
/* Action links */

if ($origin != 'learnpath') {
    echo '<div class="actions">';
    echo '<span style="float:right;">'.search_link().'</span>';
    echo '<a href="viewthread.php?'.api_get_cidreq().'&forum='.$forumId.'&gradebook='.$gradebook.'&thread='.$threadId.'">'.
        Display::return_icon('back.png', get_lang('BackToThread'), '', ICON_SIZE_MEDIUM).'</a>';
    echo '</div>';
}
/*New display forum div*/
echo '<div class="forum_title">';
echo '<h1>';
echo Display::url(
    prepare4display($current_forum['forum_title']),
    'viewforum.php?'.api_get_cidreq().'&'.http_build_query(['forum' => $current_forum['forum_id']]),
    ['class' => empty($current_forum['visibility']) ? 'text-muted' : null]
);
echo '</h1>';
echo '<p class="forum_description">'.prepare4display($current_forum['forum_comment']).'</p>';
echo '</div>';
if ($form) {
    $form->display();
}

if ($origin == 'learnpath') {
    Display::display_reduced_footer();
} else {
    Display::display_footer();
}