/**
     * The central part of the board - topic display.
     *
     * What it does:
     * - This function loads the posts in a topic up so they can be displayed.
     * - It uses the main sub template of the Display template.
     * - It requires a topic, and can go to the previous or next topic from it.
     * - It jumps to the correct post depending on a number/time/IS_MSG passed.
     * - It depends on the messages_per_page, defaultMaxMessages and enableAllMessages settings.
     * - It is accessed by ?topic=id_topic.START.
     */
    public function action_display()
    {
        global $scripturl, $txt, $modSettings, $context, $settings;
        global $options, $user_info, $board_info, $topic, $board;
        global $attachments, $messages_request;
        // What are you gonna display if these are empty?!
        if (empty($topic)) {
            fatal_lang_error('no_board', false);
        }
        // Load the template
        loadTemplate('Display');
        $context['sub_template'] = 'messages';
        // And the topic functions
        require_once SUBSDIR . '/Topic.subs.php';
        require_once SUBSDIR . '/Messages.subs.php';
        // Not only does a prefetch make things slower for the server, but it makes it impossible to know if they read it.
        if (isset($_SERVER['HTTP_X_MOZ']) && $_SERVER['HTTP_X_MOZ'] == 'prefetch') {
            @ob_end_clean();
            header('HTTP/1.1 403 Prefetch Forbidden');
            die;
        }
        // How much are we sticking on each page?
        $context['messages_per_page'] = empty($modSettings['disableCustomPerPage']) && !empty($options['messages_per_page']) ? $options['messages_per_page'] : $modSettings['defaultMaxMessages'];
        $template_layers = Template_Layers::getInstance();
        $template_layers->addEnd('messages_informations');
        $includeUnapproved = !$modSettings['postmod_active'] || allowedTo('approve_posts');
        // Let's do some work on what to search index.
        if (count($_GET) > 2) {
            foreach ($_GET as $k => $v) {
                if (!in_array($k, array('topic', 'board', 'start', session_name()))) {
                    $context['robot_no_index'] = true;
                }
            }
        }
        if (!empty($_REQUEST['start']) && (!is_numeric($_REQUEST['start']) || $_REQUEST['start'] % $context['messages_per_page'] != 0)) {
            $context['robot_no_index'] = true;
        }
        // Find the previous or next topic.  Make a fuss if there are no more.
        if (isset($_REQUEST['prev_next']) && ($_REQUEST['prev_next'] == 'prev' || $_REQUEST['prev_next'] == 'next')) {
            // No use in calculating the next topic if there's only one.
            if ($board_info['num_topics'] > 1) {
                $includeStickies = !empty($modSettings['enableStickyTopics']);
                $topic = $_REQUEST['prev_next'] === 'prev' ? previousTopic($topic, $board, $user_info['id'], $includeUnapproved, $includeStickies) : nextTopic($topic, $board, $user_info['id'], $includeUnapproved, $includeStickies);
                $context['current_topic'] = $topic;
            }
            // Go to the newest message on this topic.
            $_REQUEST['start'] = 'new';
        }
        // Add 1 to the number of views of this topic (except for robots).
        if (!$user_info['possibly_robot'] && (empty($_SESSION['last_read_topic']) || $_SESSION['last_read_topic'] != $topic)) {
            increaseViewCounter($topic);
            $_SESSION['last_read_topic'] = $topic;
        }
        $topic_selects = array();
        $topic_tables = array();
        $topic_parameters = array('topic' => $topic, 'member' => $user_info['id'], 'board' => (int) $board);
        // Allow addons to add additional details to the topic query
        call_integration_hook('integrate_topic_query', array(&$topic_selects, &$topic_tables, &$topic_parameters));
        // Load the topic details
        $topicinfo = getTopicInfo($topic_parameters, 'all', $topic_selects, $topic_tables);
        if (empty($topicinfo)) {
            fatal_lang_error('not_a_topic', false);
        }
        // Is this a moved topic that we are redirecting to?
        if (!empty($topicinfo['id_redirect_topic']) && !isset($_GET['noredir'])) {
            markTopicsRead(array($user_info['id'], $topic, $topicinfo['id_last_msg'], 0), $topicinfo['new_from'] !== 0);
            redirectexit('topic=' . $topicinfo['id_redirect_topic'] . '.0;redirfrom=' . $topicinfo['id_topic']);
        }
        $context['real_num_replies'] = $context['num_replies'] = $topicinfo['num_replies'];
        $context['topic_first_message'] = $topicinfo['id_first_msg'];
        $context['topic_last_message'] = $topicinfo['id_last_msg'];
        $context['topic_unwatched'] = isset($topicinfo['unwatched']) ? $topicinfo['unwatched'] : 0;
        if (isset($_GET['redirfrom'])) {
            $redir_topics = topicsList(array((int) $_GET['redirfrom']));
            if (!empty($redir_topics[(int) $_GET['redirfrom']])) {
                $context['topic_redirected_from'] = $redir_topics[(int) $_GET['redirfrom']];
                $context['topic_redirected_from']['redir_href'] = $scripturl . '?topic=' . $context['topic_redirected_from']['id_topic'] . '.0;noredir';
            }
        }
        // Add up unapproved replies to get real number of replies...
        if ($modSettings['postmod_active'] && allowedTo('approve_posts')) {
            $context['real_num_replies'] += $topicinfo['unapproved_posts'] - ($topicinfo['approved'] ? 0 : 1);
        }
        // If this topic was derived from another, set the followup details
        if (!empty($topicinfo['derived_from'])) {
            require_once SUBSDIR . '/FollowUps.subs.php';
            $context['topic_derived_from'] = topicStartedHere($topic, $includeUnapproved);
        }
        // If this topic has unapproved posts, we need to work out how many posts the user can see, for page indexing.
        if (!$includeUnapproved && $topicinfo['unapproved_posts'] && !$user_info['is_guest']) {
            $myUnapprovedPosts = unapprovedPosts($topic, $user_info['id']);
            $context['total_visible_posts'] = $context['num_replies'] + $myUnapprovedPosts + ($topicinfo['approved'] ? 1 : 0);
        } elseif ($user_info['is_guest']) {
            $context['total_visible_posts'] = $context['num_replies'] + ($topicinfo['approved'] ? 1 : 0);
        } else {
            $context['total_visible_posts'] = $context['num_replies'] + $topicinfo['unapproved_posts'] + ($topicinfo['approved'] ? 1 : 0);
        }
        // When was the last time this topic was replied to?  Should we warn them about it?
        if (!empty($modSettings['oldTopicDays'])) {
            $mgsOptions = basicMessageInfo($topicinfo['id_last_msg'], true);
            $context['oldTopicError'] = $mgsOptions['poster_time'] + $modSettings['oldTopicDays'] * 86400 < time() && empty($topicinfo['is_sticky']);
        } else {
            $context['oldTopicError'] = false;
        }
        // The start isn't a number; it's information about what to do, where to go.
        if (!is_numeric($_REQUEST['start'])) {
            // Redirect to the page and post with new messages, originally by Omar Bazavilvazo.
            if ($_REQUEST['start'] == 'new') {
                // Guests automatically go to the last post.
                if ($user_info['is_guest']) {
                    $context['start_from'] = $context['total_visible_posts'] - 1;
                    $_REQUEST['start'] = $context['start_from'];
                } else {
                    // Fall through to the next if statement.
                    $_REQUEST['start'] = 'msg' . $topicinfo['new_from'];
                }
            }
            // Start from a certain time index, not a message.
            if (substr($_REQUEST['start'], 0, 4) == 'from') {
                $timestamp = (int) substr($_REQUEST['start'], 4);
                if ($timestamp === 0) {
                    $_REQUEST['start'] = 0;
                } else {
                    // Find the number of messages posted before said time...
                    $context['start_from'] = countNewPosts($topic, $topicinfo, $timestamp);
                    $_REQUEST['start'] = $context['start_from'];
                }
            } elseif (substr($_REQUEST['start'], 0, 3) == 'msg') {
                $virtual_msg = (int) substr($_REQUEST['start'], 3);
                if (!$topicinfo['unapproved_posts'] && $virtual_msg >= $topicinfo['id_last_msg']) {
                    $context['start_from'] = $context['total_visible_posts'] - 1;
                } elseif (!$topicinfo['unapproved_posts'] && $virtual_msg <= $topicinfo['id_first_msg']) {
                    $context['start_from'] = 0;
                } else {
                    $only_approved = $modSettings['postmod_active'] && $topicinfo['unapproved_posts'] && !allowedTo('approve_posts');
                    $context['start_from'] = countMessagesBefore($topic, $virtual_msg, false, $only_approved, !$user_info['is_guest']);
                }
                // We need to reverse the start as well in this case.
                $_REQUEST['start'] = $context['start_from'];
            }
        }
        // Mark the mention as read if requested
        if (isset($_REQUEST['mentionread']) && !empty($virtual_msg)) {
            require_once CONTROLLERDIR . '/Mentions.controller.php';
            $mentions = new Mentions_Controller();
            $mentions->setData(array('id_mention' => $_REQUEST['item'], 'mark' => $_REQUEST['mark']));
            $mentions->action_markread();
        }
        // Create a previous next string if the selected theme has it as a selected option.
        if ($modSettings['enablePreviousNext']) {
            $context['links'] += array('go_prev' => $scripturl . '?topic=' . $topic . '.0;prev_next=prev#new', 'go_next' => $scripturl . '?topic=' . $topic . '.0;prev_next=next#new');
        }
        // Derived from, set the link back
        if (!empty($context['topic_derived_from'])) {
            $context['links']['derived_from'] = $scripturl . '?msg=' . $context['topic_derived_from']['derived_from'];
        }
        // Check if spellchecking is both enabled and actually working. (for quick reply.)
        $context['show_spellchecking'] = !empty($modSettings['enableSpellChecking']) && function_exists('pspell_new');
        if ($context['show_spellchecking']) {
            loadJavascriptFile('spellcheck.js', array('defer' => true));
        }
        // Do we need to show the visual verification image?
        $context['require_verification'] = !$user_info['is_mod'] && !$user_info['is_admin'] && !empty($modSettings['posts_require_captcha']) && ($user_info['posts'] < $modSettings['posts_require_captcha'] || $user_info['is_guest'] && $modSettings['posts_require_captcha'] == -1);
        if ($context['require_verification']) {
            require_once SUBSDIR . '/VerificationControls.class.php';
            $verificationOptions = array('id' => 'post');
            $context['require_verification'] = create_control_verification($verificationOptions);
            $context['visual_verification_id'] = $verificationOptions['id'];
        }
        // Are we showing signatures - or disabled fields?
        $context['signature_enabled'] = substr($modSettings['signature_settings'], 0, 1) == 1;
        $context['disabled_fields'] = isset($modSettings['disabled_profile_fields']) ? array_flip(explode(',', $modSettings['disabled_profile_fields'])) : array();
        // Censor the title...
        censorText($topicinfo['subject']);
        $context['page_title'] = $topicinfo['subject'];
        // Is this topic sticky, or can it even be?
        $topicinfo['is_sticky'] = empty($modSettings['enableStickyTopics']) ? '0' : $topicinfo['is_sticky'];
        // Allow addons access to the topicinfo array
        call_integration_hook('integrate_display_topic', array($topicinfo));
        // Default this topic to not marked for notifications... of course...
        $context['is_marked_notify'] = false;
        // Did we report a post to a moderator just now?
        $context['report_sent'] = isset($_GET['reportsent']);
        if ($context['report_sent']) {
            $template_layers->add('report_sent');
        }
        // Let's get nosey, who is viewing this topic?
        if (!empty($settings['display_who_viewing'])) {
            require_once SUBSDIR . '/Who.subs.php';
            formatViewers($topic, 'topic');
        }
        // If all is set, but not allowed... just unset it.
        $can_show_all = !empty($modSettings['enableAllMessages']) && $context['total_visible_posts'] > $context['messages_per_page'] && $context['total_visible_posts'] < $modSettings['enableAllMessages'];
        if (isset($_REQUEST['all']) && !$can_show_all) {
            unset($_REQUEST['all']);
        } elseif (isset($_REQUEST['all'])) {
            $_REQUEST['start'] = -1;
        }
        // Construct the page index, allowing for the .START method...
        $context['page_index'] = constructPageIndex($scripturl . '?topic=' . $topic . '.%1$d', $_REQUEST['start'], $context['total_visible_posts'], $context['messages_per_page'], true, array('all' => $can_show_all, 'all_selected' => isset($_REQUEST['all'])));
        $context['start'] = $_REQUEST['start'];
        // This is information about which page is current, and which page we're on - in case you don't like the constructed page index. (again, wireles..)
        $context['page_info'] = array('current_page' => $_REQUEST['start'] / $context['messages_per_page'] + 1, 'num_pages' => floor(($context['total_visible_posts'] - 1) / $context['messages_per_page']) + 1);
        // Figure out all the link to the next/prev
        $context['links'] += array('prev' => $_REQUEST['start'] >= $context['messages_per_page'] ? $scripturl . '?topic=' . $topic . '.' . ($_REQUEST['start'] - $context['messages_per_page']) : '', 'next' => $_REQUEST['start'] + $context['messages_per_page'] < $context['total_visible_posts'] ? $scripturl . '?topic=' . $topic . '.' . ($_REQUEST['start'] + $context['messages_per_page']) : '');
        // If they are viewing all the posts, show all the posts, otherwise limit the number.
        if ($can_show_all && isset($_REQUEST['all'])) {
            // No limit! (actually, there is a limit, but...)
            $context['messages_per_page'] = -1;
            // Set start back to 0...
            $_REQUEST['start'] = 0;
        }
        // Build the link tree.
        $context['linktree'][] = array('url' => $scripturl . '?topic=' . $topic . '.0', 'name' => $topicinfo['subject']);
        // Build a list of this board's moderators.
        $context['moderators'] =& $board_info['moderators'];
        $context['link_moderators'] = array();
        // Information about the current topic...
        $context['is_locked'] = $topicinfo['locked'];
        $context['is_sticky'] = $topicinfo['is_sticky'];
        $context['is_very_hot'] = $topicinfo['num_replies'] >= $modSettings['hotTopicVeryPosts'];
        $context['is_hot'] = $topicinfo['num_replies'] >= $modSettings['hotTopicPosts'];
        $context['is_approved'] = $topicinfo['approved'];
        $context['is_poll'] = $topicinfo['id_poll'] > 0 && !empty($modSettings['pollMode']) && allowedTo('poll_view');
        determineTopicClass($context);
        // Did this user start the topic or not?
        $context['user']['started'] = $user_info['id'] == $topicinfo['id_member_started'] && !$user_info['is_guest'];
        $context['topic_starter_id'] = $topicinfo['id_member_started'];
        // Set the topic's information for the template.
        $context['subject'] = $topicinfo['subject'];
        $context['num_views'] = $topicinfo['num_views'];
        $context['num_views_text'] = $context['num_views'] == 1 ? $txt['read_one_time'] : sprintf($txt['read_many_times'], $context['num_views']);
        $context['mark_unread_time'] = !empty($virtual_msg) ? $virtual_msg : $topicinfo['new_from'];
        // Set a canonical URL for this page.
        $context['canonical_url'] = $scripturl . '?topic=' . $topic . '.' . $context['start'];
        // For quick reply we need a response prefix in the default forum language.
        $context['response_prefix'] = response_prefix();
        // If we want to show event information in the topic, prepare the data.
        if (allowedTo('calendar_view') && !empty($modSettings['cal_showInTopic']) && !empty($modSettings['cal_enabled'])) {
            // We need events details and all that jazz
            require_once SUBSDIR . '/Calendar.subs.php';
            // First, try create a better time format, ignoring the "time" elements.
            if (preg_match('~%[AaBbCcDdeGghjmuYy](?:[^%]*%[AaBbCcDdeGghjmuYy])*~', $user_info['time_format'], $matches) == 0 || empty($matches[0])) {
                $date_string = $user_info['time_format'];
            } else {
                $date_string = $matches[0];
            }
            // Get event information for this topic.
            $events = eventInfoForTopic($topic);
            $context['linked_calendar_events'] = array();
            foreach ($events as $event) {
                // Prepare the dates for being formatted.
                $start_date = sscanf($event['start_date'], '%04d-%02d-%02d');
                $start_date = mktime(12, 0, 0, $start_date[1], $start_date[2], $start_date[0]);
                $end_date = sscanf($event['end_date'], '%04d-%02d-%02d');
                $end_date = mktime(12, 0, 0, $end_date[1], $end_date[2], $end_date[0]);
                $context['linked_calendar_events'][] = array('id' => $event['id_event'], 'title' => $event['title'], 'can_edit' => allowedTo('calendar_edit_any') || $event['id_member'] == $user_info['id'] && allowedTo('calendar_edit_own'), 'modify_href' => $scripturl . '?action=post;msg=' . $topicinfo['id_first_msg'] . ';topic=' . $topic . '.0;calendar;eventid=' . $event['id_event'] . ';' . $context['session_var'] . '=' . $context['session_id'], 'can_export' => allowedTo('calendar_edit_any') || $event['id_member'] == $user_info['id'] && allowedTo('calendar_edit_own'), 'export_href' => $scripturl . '?action=calendar;sa=ical;eventid=' . $event['id_event'] . ';' . $context['session_var'] . '=' . $context['session_id'], 'start_date' => standardTime($start_date, $date_string, 'none'), 'start_timestamp' => $start_date, 'end_date' => standardTime($end_date, $date_string, 'none'), 'end_timestamp' => $end_date, 'is_last' => false);
            }
            if (!empty($context['linked_calendar_events'])) {
                $context['linked_calendar_events'][count($context['linked_calendar_events']) - 1]['is_last'] = true;
                $template_layers->add('display_calendar');
            }
        }
        // Create the poll info if it exists.
        if ($context['is_poll']) {
            $template_layers->add('display_poll');
            require_once SUBSDIR . '/Poll.subs.php';
            loadPollContext($topicinfo['id_poll']);
            // Build the poll moderation button array.
            $context['poll_buttons'] = array('vote' => array('test' => 'allow_return_vote', 'text' => 'poll_return_vote', 'image' => 'poll_options.png', 'lang' => true, 'url' => $scripturl . '?topic=' . $context['current_topic'] . '.' . $context['start']), 'results' => array('test' => 'allow_poll_view', 'text' => 'poll_results', 'image' => 'poll_results.png', 'lang' => true, 'url' => $scripturl . '?topic=' . $context['current_topic'] . '.' . $context['start'] . ';viewresults'), 'change_vote' => array('test' => 'allow_change_vote', 'text' => 'poll_change_vote', 'image' => 'poll_change_vote.png', 'lang' => true, 'url' => $scripturl . '?action=poll;sa=vote;topic=' . $context['current_topic'] . '.' . $context['start'] . ';poll=' . $context['poll']['id'] . ';' . $context['session_var'] . '=' . $context['session_id']), 'lock' => array('test' => 'allow_lock_poll', 'text' => !$context['poll']['is_locked'] ? 'poll_lock' : 'poll_unlock', 'image' => 'poll_lock.png', 'lang' => true, 'url' => $scripturl . '?action=lockvoting;topic=' . $context['current_topic'] . '.' . $context['start'] . ';' . $context['session_var'] . '=' . $context['session_id']), 'edit' => array('test' => 'allow_edit_poll', 'text' => 'poll_edit', 'image' => 'poll_edit.png', 'lang' => true, 'url' => $scripturl . '?action=editpoll;topic=' . $context['current_topic'] . '.' . $context['start']), 'remove_poll' => array('test' => 'can_remove_poll', 'text' => 'poll_remove', 'image' => 'admin_remove_poll.png', 'lang' => true, 'custom' => 'onclick="return confirm(\'' . $txt['poll_remove_warn'] . '\');"', 'url' => $scripturl . '?action=poll;sa=remove;topic=' . $context['current_topic'] . '.' . $context['start'] . ';' . $context['session_var'] . '=' . $context['session_id']));
            // Allow mods to add additional buttons here
            call_integration_hook('integrate_poll_buttons');
        }
        // Calculate the fastest way to get the messages!
        $ascending = true;
        $start = $_REQUEST['start'];
        $limit = $context['messages_per_page'];
        $firstIndex = 0;
        if ($start >= $context['total_visible_posts'] / 2 && $context['messages_per_page'] != -1) {
            $ascending = !$ascending;
            $limit = $context['total_visible_posts'] <= $start + $limit ? $context['total_visible_posts'] - $start : $limit;
            $start = $context['total_visible_posts'] <= $start + $limit ? 0 : $context['total_visible_posts'] - $start - $limit;
            $firstIndex = $limit - 1;
        }
        // Taking care of member specific settings
        $limit_settings = array('messages_per_page' => $context['messages_per_page'], 'start' => $start, 'offset' => $limit);
        // Get each post and poster in this topic.
        $topic_details = getTopicsPostsAndPoster($topic, $limit_settings, $ascending);
        $messages = $topic_details['messages'];
        $posters = array_unique($topic_details['all_posters']);
        $all_posters = $topic_details['all_posters'];
        unset($topic_details);
        call_integration_hook('integrate_display_message_list', array(&$messages, &$posters));
        // Guests can't mark topics read or for notifications, just can't sorry.
        if (!$user_info['is_guest'] && !empty($messages)) {
            $mark_at_msg = max($messages);
            if ($mark_at_msg >= $topicinfo['id_last_msg']) {
                $mark_at_msg = $modSettings['maxMsgID'];
            }
            if ($mark_at_msg >= $topicinfo['new_from']) {
                markTopicsRead(array($user_info['id'], $topic, $mark_at_msg, $topicinfo['unwatched']), $topicinfo['new_from'] !== 0);
            }
            updateReadNotificationsFor($topic, $board);
            // Have we recently cached the number of new topics in this board, and it's still a lot?
            if (isset($_REQUEST['topicseen']) && isset($_SESSION['topicseen_cache'][$board]) && $_SESSION['topicseen_cache'][$board] > 5) {
                $_SESSION['topicseen_cache'][$board]--;
            } elseif (isset($_REQUEST['topicseen'])) {
                // Use the mark read tables... and the last visit to figure out if this should be read or not.
                $numNewTopics = getUnreadCountSince($board, empty($_SESSION['id_msg_last_visit']) ? 0 : $_SESSION['id_msg_last_visit']);
                // If there're no real new topics in this board, mark the board as seen.
                if (empty($numNewTopics)) {
                    $_REQUEST['boardseen'] = true;
                } else {
                    $_SESSION['topicseen_cache'][$board] = $numNewTopics;
                }
            } elseif (isset($_SESSION['topicseen_cache'][$board])) {
                $_SESSION['topicseen_cache'][$board]--;
            }
            // Mark board as seen if we came using last post link from BoardIndex. (or other places...)
            if (isset($_REQUEST['boardseen'])) {
                require_once SUBSDIR . '/Boards.subs.php';
                markBoardsRead($board, false, false);
            }
        }
        $attachments = array();
        // If there _are_ messages here... (probably an error otherwise :!)
        if (!empty($messages)) {
            require_once SUBSDIR . '/Attachments.subs.php';
            // Fetch attachments.
            $includeUnapproved = !$modSettings['postmod_active'] || allowedTo('approve_posts');
            if (!empty($modSettings['attachmentEnable']) && allowedTo('view_attachments')) {
                $attachments = getAttachments($messages, $includeUnapproved, 'filter_accessible_attachment', $all_posters);
            }
            $msg_parameters = array('message_list' => $messages, 'new_from' => $topicinfo['new_from']);
            $msg_selects = array();
            $msg_tables = array();
            call_integration_hook('integrate_message_query', array(&$msg_selects, &$msg_tables, &$msg_parameters));
            // What?  It's not like it *couldn't* be only guests in this topic...
            if (!empty($posters)) {
                loadMemberData($posters);
            }
            // Load in the likes for this group of messages
            if (!empty($modSettings['likes_enabled'])) {
                require_once SUBSDIR . '/Likes.subs.php';
                $context['likes'] = loadLikes($messages, true);
                // ajax controller for likes
                loadJavascriptFile('like_posts.js', array('defer' => true));
                loadLanguage('Errors');
                // Initiate likes and the tooltips for likes
                addInlineJavascript('
				$(document).ready(function () {
					var likePostInstance = likePosts.prototype.init({
						oTxt: ({
							btnText : ' . JavaScriptEscape($txt['ok_uppercase']) . ',
							likeHeadingError : ' . JavaScriptEscape($txt['like_heading_error']) . ',
							error_occurred : ' . JavaScriptEscape($txt['error_occurred']) . '
						}),
					});

					$(".like_button, .unlike_button").SiteTooltip({
						hoverIntent: {
							sensitivity: 10,
							interval: 150,
							timeout: 50
						}
					});
				});', true);
            }
            $messages_request = loadMessageRequest($msg_selects, $msg_tables, $msg_parameters);
            if (!empty($modSettings['enableFollowup'])) {
                require_once SUBSDIR . '/FollowUps.subs.php';
                $context['follow_ups'] = followupTopics($messages, $includeUnapproved);
            }
            // Go to the last message if the given time is beyond the time of the last message.
            if (isset($context['start_from']) && $context['start_from'] >= $topicinfo['num_replies']) {
                $context['start_from'] = $topicinfo['num_replies'];
            }
            // Since the anchor information is needed on the top of the page we load these variables beforehand.
            $context['first_message'] = isset($messages[$firstIndex]) ? $messages[$firstIndex] : $messages[0];
            $context['first_new_message'] = isset($context['start_from']) && $_REQUEST['start'] == $context['start_from'];
        } else {
            $messages_request = false;
            $context['first_message'] = 0;
            $context['first_new_message'] = false;
        }
        $context['jump_to'] = array('label' => addslashes(un_htmlspecialchars($txt['jump_to'])), 'board_name' => htmlspecialchars(strtr(strip_tags($board_info['name']), array('&amp;' => '&')), ENT_COMPAT, 'UTF-8'), 'child_level' => $board_info['child_level']);
        // Set the callback.  (do you REALIZE how much memory all the messages would take?!?)
        // This will be called from the template.
        $context['get_message'] = array($this, 'prepareDisplayContext_callback');
        // Now set all the wonderful, wonderful permissions... like moderation ones...
        $common_permissions = array('can_approve' => 'approve_posts', 'can_ban' => 'manage_bans', 'can_sticky' => 'make_sticky', 'can_merge' => 'merge_any', 'can_split' => 'split_any', 'calendar_post' => 'calendar_post', 'can_mark_notify' => 'mark_any_notify', 'can_send_topic' => 'send_topic', 'can_send_pm' => 'pm_send', 'can_send_email' => 'send_email_to_members', 'can_report_moderator' => 'report_any', 'can_moderate_forum' => 'moderate_forum', 'can_issue_warning' => 'issue_warning', 'can_restore_topic' => 'move_any', 'can_restore_msg' => 'move_any');
        foreach ($common_permissions as $contextual => $perm) {
            $context[$contextual] = allowedTo($perm);
        }
        // Permissions with _any/_own versions.  $context[YYY] => ZZZ_any/_own.
        $anyown_permissions = array('can_move' => 'move', 'can_lock' => 'lock', 'can_delete' => 'remove', 'can_add_poll' => 'poll_add', 'can_remove_poll' => 'poll_remove', 'can_reply' => 'post_reply', 'can_reply_unapproved' => 'post_unapproved_replies');
        foreach ($anyown_permissions as $contextual => $perm) {
            $context[$contextual] = allowedTo($perm . '_any') || $context['user']['started'] && allowedTo($perm . '_own');
        }
        // Cleanup all the permissions with extra stuff...
        $context['can_mark_notify'] &= !$context['user']['is_guest'];
        $context['can_sticky'] &= !empty($modSettings['enableStickyTopics']);
        $context['calendar_post'] &= !empty($modSettings['cal_enabled']) && (allowedTo('modify_any') || $context['user']['started'] && allowedTo('modify_own'));
        $context['can_add_poll'] &= !empty($modSettings['pollMode']) && $topicinfo['id_poll'] <= 0;
        $context['can_remove_poll'] &= !empty($modSettings['pollMode']) && $topicinfo['id_poll'] > 0;
        $context['can_reply'] &= empty($topicinfo['locked']) || allowedTo('moderate_board');
        $context['can_reply_unapproved'] &= $modSettings['postmod_active'] && (empty($topicinfo['locked']) || allowedTo('moderate_board'));
        $context['can_issue_warning'] &= in_array('w', $context['admin_features']) && !empty($modSettings['warning_enable']);
        // Handle approval flags...
        $context['can_reply_approved'] = $context['can_reply'];
        $context['can_reply'] |= $context['can_reply_unapproved'];
        $context['can_quote'] = $context['can_reply'] && (empty($modSettings['disabledBBC']) || !in_array('quote', explode(',', $modSettings['disabledBBC'])));
        $context['can_mark_unread'] = !$user_info['is_guest'] && $settings['show_mark_read'];
        $context['can_unwatch'] = !$user_info['is_guest'] && $modSettings['enable_unwatch'];
        $context['can_send_topic'] = (!$modSettings['postmod_active'] || $topicinfo['approved']) && allowedTo('send_topic');
        $context['can_print'] = empty($modSettings['disable_print_topic']);
        // Start this off for quick moderation - it will be or'd for each post.
        $context['can_remove_post'] = allowedTo('delete_any') || allowedTo('delete_replies') && $context['user']['started'];
        // Can restore topic?  That's if the topic is in the recycle board and has a previous restore state.
        $context['can_restore_topic'] &= !empty($modSettings['recycle_enable']) && $modSettings['recycle_board'] == $board && !empty($topicinfo['id_previous_board']);
        $context['can_restore_msg'] &= !empty($modSettings['recycle_enable']) && $modSettings['recycle_board'] == $board && !empty($topicinfo['id_previous_topic']);
        $context['can_follow_up'] = !empty($modSettings['enableFollowup']) && boardsallowedto('post_new') !== array();
        // Check if the draft functions are enabled and that they have permission to use them (for quick reply.)
        $context['drafts_save'] = !empty($modSettings['drafts_enabled']) && !empty($modSettings['drafts_post_enabled']) && allowedTo('post_draft') && $context['can_reply'];
        $context['drafts_autosave'] = !empty($context['drafts_save']) && !empty($modSettings['drafts_autosave_enabled']) && allowedTo('post_autosave_draft');
        if (!empty($context['drafts_save'])) {
            loadLanguage('Drafts');
        }
        if (!empty($context['drafts_autosave']) && empty($options['use_editor_quick_reply'])) {
            loadJavascriptFile('drafts.js');
        }
        if (!empty($modSettings['mentions_enabled'])) {
            $context['mentions_enabled'] = true;
            // Just using the plain text quick reply and not the editor
            if (empty($options['use_editor_quick_reply'])) {
                loadJavascriptFile(array('jquery.atwho.js', 'jquery.caret.min.js', 'mentioning.js'));
            }
            loadCSSFile('jquery.atwho.css');
            addInlineJavascript('
			$(document).ready(function () {
				for (var i = 0, count = all_elk_mentions.length; i < count; i++)
					all_elk_mentions[i].oMention = new elk_mentions(all_elk_mentions[i].oOptions);
			});');
        }
        // Load up the Quick ModifyTopic and Quick Reply scripts
        loadJavascriptFile('topic.js');
        // Auto video embeding enabled?
        if (!empty($modSettings['enableVideoEmbeding'])) {
            addInlineJavascript('
		$(document).ready(function() {
			$().linkifyvideo(oEmbedtext);
		});');
        }
        // Load up the "double post" sequencing magic.
        if (!empty($options['display_quick_reply'])) {
            checkSubmitOnce('register');
            $context['name'] = isset($_SESSION['guest_name']) ? $_SESSION['guest_name'] : '';
            $context['email'] = isset($_SESSION['guest_email']) ? $_SESSION['guest_email'] : '';
            if (!empty($options['use_editor_quick_reply']) && $context['can_reply']) {
                // Needed for the editor and message icons.
                require_once SUBSDIR . '/Editor.subs.php';
                // Now create the editor.
                $editorOptions = array('id' => 'message', 'value' => '', 'labels' => array('post_button' => $txt['post']), 'height' => '250px', 'width' => '100%', 'preview_type' => 0);
                create_control_richedit($editorOptions);
                $context['attached'] = '';
                $context['make_poll'] = isset($_REQUEST['poll']);
                // Message icons - customized icons are off?
                $context['icons'] = getMessageIcons($board);
                if (!empty($context['icons'])) {
                    $context['icons'][count($context['icons']) - 1]['is_last'] = true;
                }
            }
        }
        addJavascriptVar(array('notification_topic_notice' => $context['is_marked_notify'] ? $txt['notification_disable_topic'] : $txt['notification_enable_topic']), true);
        if ($context['can_send_topic']) {
            addJavascriptVar(array('sendtopic_cancel' => $txt['modify_cancel'], 'sendtopic_back' => $txt['back'], 'sendtopic_close' => $txt['find_close'], 'sendtopic_error' => $txt['send_error_occurred'], 'required_field' => $txt['require_field']), true);
        }
        // Build the normal button array.
        $context['normal_buttons'] = array('reply' => array('test' => 'can_reply', 'text' => 'reply', 'image' => 'reply.png', 'lang' => true, 'url' => $scripturl . '?action=post;topic=' . $context['current_topic'] . '.' . $context['start'] . ';last_msg=' . $context['topic_last_message'], 'active' => true), 'notify' => array('test' => 'can_mark_notify', 'text' => $context['is_marked_notify'] ? 'unnotify' : 'notify', 'image' => ($context['is_marked_notify'] ? 'un' : '') . 'notify.png', 'lang' => true, 'custom' => 'onclick="return notifyButton(this);"', 'url' => $scripturl . '?action=notify;sa=' . ($context['is_marked_notify'] ? 'off' : 'on') . ';topic=' . $context['current_topic'] . '.' . $context['start'] . ';' . $context['session_var'] . '=' . $context['session_id']), 'mark_unread' => array('test' => 'can_mark_unread', 'text' => 'mark_unread', 'image' => 'markunread.png', 'lang' => true, 'url' => $scripturl . '?action=markasread;sa=topic;t=' . $context['mark_unread_time'] . ';topic=' . $context['current_topic'] . '.' . $context['start'] . ';' . $context['session_var'] . '=' . $context['session_id']), 'unwatch' => array('test' => 'can_unwatch', 'text' => ($context['topic_unwatched'] ? '' : 'un') . 'watch', 'image' => ($context['topic_unwatched'] ? '' : 'un') . 'watched.png', 'lang' => true, 'custom' => 'onclick="return unwatchButton(this);"', 'url' => $scripturl . '?action=unwatchtopic;topic=' . $context['current_topic'] . '.' . $context['start'] . ';sa=' . ($context['topic_unwatched'] ? 'off' : 'on') . ';' . $context['session_var'] . '=' . $context['session_id']), 'send' => array('test' => 'can_send_topic', 'text' => 'send_topic', 'image' => 'sendtopic.png', 'lang' => true, 'url' => $scripturl . '?action=emailuser;sa=sendtopic;topic=' . $context['current_topic'] . '.0', 'custom' => 'onclick="return sendtopicOverlayDiv(this.href, \'' . $txt['send_topic'] . '\');"'), 'print' => array('test' => 'can_print', 'text' => 'print', 'image' => 'print.png', 'lang' => true, 'custom' => 'rel="nofollow"', 'class' => 'new_win', 'url' => $scripturl . '?action=topic;sa=printpage;topic=' . $context['current_topic'] . '.0'));
        // Build the mod button array
        $context['mod_buttons'] = array('move' => array('test' => 'can_move', 'text' => 'move_topic', 'image' => 'admin_move.png', 'lang' => true, 'url' => $scripturl . '?action=movetopic;current_board=' . $context['current_board'] . ';topic=' . $context['current_topic'] . '.0'), 'delete' => array('test' => 'can_delete', 'text' => 'remove_topic', 'image' => 'admin_rem.png', 'lang' => true, 'custom' => 'onclick="return confirm(\'' . $txt['are_sure_remove_topic'] . '\');"', 'url' => $scripturl . '?action=removetopic2;topic=' . $context['current_topic'] . '.0;' . $context['session_var'] . '=' . $context['session_id']), 'lock' => array('test' => 'can_lock', 'text' => empty($context['is_locked']) ? 'set_lock' : 'set_unlock', 'image' => 'admin_lock.png', 'lang' => true, 'url' => $scripturl . '?action=topic;sa=lock;topic=' . $context['current_topic'] . '.' . $context['start'] . ';' . $context['session_var'] . '=' . $context['session_id']), 'sticky' => array('test' => 'can_sticky', 'text' => empty($context['is_sticky']) ? 'set_sticky' : 'set_nonsticky', 'image' => 'admin_sticky.png', 'lang' => true, 'url' => $scripturl . '?action=topic;sa=sticky;topic=' . $context['current_topic'] . '.' . $context['start'] . ';' . $context['session_var'] . '=' . $context['session_id']), 'merge' => array('test' => 'can_merge', 'text' => 'merge', 'image' => 'merge.png', 'lang' => true, 'url' => $scripturl . '?action=mergetopics;board=' . $context['current_board'] . '.0;from=' . $context['current_topic']), 'calendar' => array('test' => 'calendar_post', 'text' => 'calendar_link', 'image' => 'linktocal.png', 'lang' => true, 'url' => $scripturl . '?action=post;calendar;msg=' . $context['topic_first_message'] . ';topic=' . $context['current_topic'] . '.0'));
        // Restore topic. eh?  No monkey business.
        if ($context['can_restore_topic']) {
            $context['mod_buttons'][] = array('text' => 'restore_topic', 'image' => '', 'lang' => true, 'url' => $scripturl . '?action=restoretopic;topics=' . $context['current_topic'] . ';' . $context['session_var'] . '=' . $context['session_id']);
        }
        if ($context['can_reply'] && !empty($options['display_quick_reply'])) {
            $template_layers->add('quickreply');
        }
        $template_layers->add('pages_and_buttons');
        // Allow adding new buttons easily.
        call_integration_hook('integrate_display_buttons');
        call_integration_hook('integrate_mod_buttons');
    }
 /**
  * Show the list of topics in this board, along with any sub-boards.
  * @uses MessageIndex template topic_listing sub template
  */
 public function action_messageindex()
 {
     global $txt, $scripturl, $board, $modSettings, $context;
     global $options, $settings, $board_info, $user_info;
     // Fairly often, we'll work with boards. Current board, sub-boards.
     require_once SUBSDIR . '/Boards.subs.php';
     // If this is a redirection board head off.
     if ($board_info['redirect']) {
         incrementBoard($board, 'num_posts');
         redirectexit($board_info['redirect']);
     }
     loadTemplate('MessageIndex');
     loadJavascriptFile('topic.js');
     $context['name'] = $board_info['name'];
     $context['sub_template'] = 'topic_listing';
     $context['description'] = $board_info['description'];
     $template_layers = Template_Layers::getInstance();
     // How many topics do we have in total?
     $board_info['total_topics'] = allowedTo('approve_posts') ? $board_info['num_topics'] + $board_info['unapproved_topics'] : $board_info['num_topics'] + $board_info['unapproved_user_topics'];
     // View all the topics, or just a few?
     $context['topics_per_page'] = empty($modSettings['disableCustomPerPage']) && !empty($options['topics_per_page']) ? $options['topics_per_page'] : $modSettings['defaultMaxTopics'];
     $context['messages_per_page'] = empty($modSettings['disableCustomPerPage']) && !empty($options['messages_per_page']) ? $options['messages_per_page'] : $modSettings['defaultMaxMessages'];
     $maxindex = isset($_REQUEST['all']) && !empty($modSettings['enableAllMessages']) ? $board_info['total_topics'] : $context['topics_per_page'];
     // Right, let's only index normal stuff!
     if (count($_GET) > 1) {
         $session_name = session_name();
         foreach ($_GET as $k => $v) {
             if (!in_array($k, array('board', 'start', $session_name))) {
                 $context['robot_no_index'] = true;
             }
         }
     }
     if (!empty($_REQUEST['start']) && (!is_numeric($_REQUEST['start']) || $_REQUEST['start'] % $context['messages_per_page'] != 0)) {
         $context['robot_no_index'] = true;
     }
     // If we can view unapproved messages and there are some build up a list.
     if (allowedTo('approve_posts') && ($board_info['unapproved_topics'] || $board_info['unapproved_posts'])) {
         $untopics = $board_info['unapproved_topics'] ? '<a href="' . $scripturl . '?action=moderate;area=postmod;sa=topics;brd=' . $board . '">' . $board_info['unapproved_topics'] . '</a>' : 0;
         $unposts = $board_info['unapproved_posts'] ? '<a href="' . $scripturl . '?action=moderate;area=postmod;sa=posts;brd=' . $board . '">' . ($board_info['unapproved_posts'] - $board_info['unapproved_topics']) . '</a>' : 0;
         $context['unapproved_posts_message'] = sprintf($txt['there_are_unapproved_topics'], $untopics, $unposts, $scripturl . '?action=moderate;area=postmod;sa=' . ($board_info['unapproved_topics'] ? 'topics' : 'posts') . ';brd=' . $board);
     }
     // We only know these.
     if (isset($_REQUEST['sort']) && !in_array($_REQUEST['sort'], array('subject', 'starter', 'last_poster', 'replies', 'views', 'likes', 'first_post', 'last_post'))) {
         $_REQUEST['sort'] = 'last_post';
     }
     // Make sure the starting place makes sense and construct the page index.
     if (isset($_REQUEST['sort'])) {
         $sort_string = ';sort=' . $_REQUEST['sort'] . (isset($_REQUEST['desc']) ? ';desc' : '');
     } else {
         $sort_string = '';
     }
     $context['page_index'] = constructPageIndex($scripturl . '?board=' . $board . '.%1$d' . $sort_string, $_REQUEST['start'], $board_info['total_topics'], $maxindex, true);
     $context['start'] =& $_REQUEST['start'];
     // Set a canonical URL for this page.
     $context['canonical_url'] = $scripturl . '?board=' . $board . '.' . $context['start'];
     $context['links'] += array('prev' => $_REQUEST['start'] >= $context['topics_per_page'] ? $scripturl . '?board=' . $board . '.' . ($_REQUEST['start'] - $context['topics_per_page']) : '', 'next' => $_REQUEST['start'] + $context['topics_per_page'] < $board_info['total_topics'] ? $scripturl . '?board=' . $board . '.' . ($_REQUEST['start'] + $context['topics_per_page']) : '');
     $context['page_info'] = array('current_page' => $_REQUEST['start'] / $context['topics_per_page'] + 1, 'num_pages' => floor(($board_info['total_topics'] - 1) / $context['topics_per_page']) + 1);
     if (isset($_REQUEST['all']) && !empty($modSettings['enableAllMessages']) && $maxindex > $modSettings['enableAllMessages']) {
         $maxindex = $modSettings['enableAllMessages'];
         $_REQUEST['start'] = 0;
     }
     // Build a list of the board's moderators.
     $context['moderators'] =& $board_info['moderators'];
     $context['link_moderators'] = array();
     if (!empty($board_info['moderators'])) {
         foreach ($board_info['moderators'] as $mod) {
             $context['link_moderators'][] = '<a href="' . $scripturl . '?action=profile;u=' . $mod['id'] . '" title="' . $txt['board_moderator'] . '">' . $mod['name'] . '</a>';
         }
     }
     // Mark current and parent boards as seen.
     if (!$user_info['is_guest']) {
         // We can't know they read it if we allow prefetches.
         if (isset($_SERVER['HTTP_X_MOZ']) && $_SERVER['HTTP_X_MOZ'] == 'prefetch') {
             @ob_end_clean();
             header('HTTP/1.1 403 Prefetch Forbidden');
             die;
         }
         // Mark the board as read, and its parents.
         if (!empty($board_info['parent_boards'])) {
             $board_list = array_keys($board_info['parent_boards']);
             $board_list[] = $board;
         } else {
             $board_list = array($board);
         }
         // Mark boards as read. Boards alone, no need for topics.
         markBoardsRead($board_list, false, false);
         // Clear topicseen cache
         if (!empty($board_info['parent_boards'])) {
             // We've seen all these boards now!
             foreach ($board_info['parent_boards'] as $k => $dummy) {
                 if (isset($_SESSION['topicseen_cache'][$k])) {
                     unset($_SESSION['topicseen_cache'][$k]);
                 }
             }
         }
         if (isset($_SESSION['topicseen_cache'][$board])) {
             unset($_SESSION['topicseen_cache'][$board]);
         }
         // From now on, they've seen it. So we reset notifications.
         $context['is_marked_notify'] = resetSentBoardNotification($user_info['id'], $board);
     } else {
         $context['is_marked_notify'] = false;
     }
     // 'Print' the header and board info.
     $context['page_title'] = strip_tags($board_info['name']);
     // Set the variables up for the template.
     $context['can_mark_notify'] = allowedTo('mark_notify') && !$user_info['is_guest'];
     $context['can_post_new'] = allowedTo('post_new') || $modSettings['postmod_active'] && allowedTo('post_unapproved_topics');
     $context['can_post_poll'] = !empty($modSettings['pollMode']) && allowedTo('poll_post') && $context['can_post_new'];
     $context['can_moderate_forum'] = allowedTo('moderate_forum');
     $context['can_approve_posts'] = allowedTo('approve_posts');
     // Prepare sub-boards for display.
     require_once SUBSDIR . '/BoardsList.class.php';
     $boardIndexOptions = array('include_categories' => false, 'base_level' => $board_info['child_level'] + 1, 'parent_id' => $board_info['id'], 'set_latest_post' => false, 'countChildPosts' => !empty($modSettings['countChildPosts']));
     $boardlist = new Boards_List($boardIndexOptions);
     $context['boards'] = $boardlist->getBoards();
     // Nosey, nosey - who's viewing this board?
     if (!empty($settings['display_who_viewing'])) {
         require_once SUBSDIR . '/Who.subs.php';
         formatViewers($board, 'board');
     }
     // And now, what we're here for: topics!
     require_once SUBSDIR . '/MessageIndex.subs.php';
     // Known sort methods.
     $sort_methods = messageIndexSort();
     // They didn't pick one, default to by last post descending.
     if (!isset($_REQUEST['sort']) || !isset($sort_methods[$_REQUEST['sort']])) {
         $context['sort_by'] = 'last_post';
         $ascending = isset($_REQUEST['asc']);
     } else {
         $context['sort_by'] = $_REQUEST['sort'];
         $ascending = !isset($_REQUEST['desc']);
     }
     $sort_column = $sort_methods[$context['sort_by']];
     $context['sort_direction'] = $ascending ? 'up' : 'down';
     $context['sort_title'] = $ascending ? $txt['sort_desc'] : $txt['sort_asc'];
     // Trick
     $txt['starter'] = $txt['started_by'];
     foreach ($sort_methods as $key => $val) {
         $context['topics_headers'][$key] = array('url' => $scripturl . '?board=' . $context['current_board'] . '.' . $context['start'] . ';sort=' . $key . ($context['sort_by'] == $key && $context['sort_direction'] == 'up' ? ';desc' : ''), 'sort_dir_img' => $context['sort_by'] == $key ? '<img class="sort" src="' . $settings['images_url'] . '/sort_' . $context['sort_direction'] . '.png" alt="" title="' . $context['sort_title'] . '" />' : '');
     }
     // Calculate the fastest way to get the topics.
     $start = (int) $_REQUEST['start'];
     if ($start > ($board_info['total_topics'] - 1) / 2) {
         $ascending = !$ascending;
         $fake_ascending = true;
         $maxindex = $board_info['total_topics'] < $start + $maxindex + 1 ? $board_info['total_topics'] - $start : $maxindex;
         $start = $board_info['total_topics'] < $start + $maxindex + 1 ? 0 : $board_info['total_topics'] - $start - $maxindex;
     } else {
         $fake_ascending = false;
     }
     // Setup the default topic icons...
     $context['icon_sources'] = MessageTopicIcons();
     $topic_ids = array();
     $context['topics'] = array();
     // Set up the query options
     $indexOptions = array('include_sticky' => !empty($modSettings['enableStickyTopics']), 'only_approved' => $modSettings['postmod_active'] && !allowedTo('approve_posts'), 'previews' => !empty($modSettings['message_index_preview']) ? empty($modSettings['preview_characters']) ? -1 : $modSettings['preview_characters'] : 0, 'include_avatars' => !empty($settings['avatars_on_indexes']), 'ascending' => $ascending, 'fake_ascending' => $fake_ascending);
     // Allow integration to modify / add to the $indexOptions
     call_integration_hook('integrate_messageindex_topics', array(&$sort_column, &$indexOptions));
     $topics_info = messageIndexTopics($board, $user_info['id'], $start, $maxindex, $context['sort_by'], $sort_column, $indexOptions);
     // Prepare for links to guests (for search engines)
     $context['pageindex_multiplier'] = empty($modSettings['disableCustomPerPage']) && !empty($options['messages_per_page']) ? $options['messages_per_page'] : $modSettings['defaultMaxMessages'];
     // Begin 'printing' the message index for current board.
     foreach ($topics_info as $row) {
         $topic_ids[] = $row['id_topic'];
         // Do they want message previews?
         if (!empty($modSettings['message_index_preview'])) {
             // Limit them to $modSettings['preview_characters'] characters
             $row['first_body'] = strip_tags(strtr(parse_bbc($row['first_body'], false, $row['id_first_msg']), array('<br />' => "\n", '&nbsp;' => ' ')));
             $row['first_body'] = Util::shorten_text($row['first_body'], !empty($modSettings['preview_characters']) ? $modSettings['preview_characters'] : 128, true);
             // No reply then they are the same, no need to process it again
             if ($row['num_replies'] == 0) {
                 $row['last_body'] == $row['first_body'];
             } else {
                 $row['last_body'] = strip_tags(strtr(parse_bbc($row['last_body'], false, $row['id_last_msg']), array('<br />' => "\n", '&nbsp;' => ' ')));
                 $row['last_body'] = Util::shorten_text($row['last_body'], !empty($modSettings['preview_characters']) ? $modSettings['preview_characters'] : 128, true);
             }
             // Censor the subject and message preview.
             censorText($row['first_subject']);
             censorText($row['first_body']);
             // Don't censor them twice!
             if ($row['id_first_msg'] == $row['id_last_msg']) {
                 $row['last_subject'] = $row['first_subject'];
                 $row['last_body'] = $row['first_body'];
             } else {
                 censorText($row['last_subject']);
                 censorText($row['last_body']);
             }
         } else {
             $row['first_body'] = '';
             $row['last_body'] = '';
             censorText($row['first_subject']);
             if ($row['id_first_msg'] == $row['id_last_msg']) {
                 $row['last_subject'] = $row['first_subject'];
             } else {
                 censorText($row['last_subject']);
             }
         }
         // Decide how many pages the topic should have.
         if ($row['num_replies'] + 1 > $context['messages_per_page']) {
             // We can't pass start by reference.
             $start = -1;
             $pages = constructPageIndex($scripturl . '?topic=' . $row['id_topic'] . '.%1$d', $start, $row['num_replies'] + 1, $context['messages_per_page'], true, array('prev_next' => false, 'all' => !empty($modSettings['enableAllMessages']) && $row['num_replies'] + 1 < $modSettings['enableAllMessages']));
         } else {
             $pages = '';
         }
         // We need to check the topic icons exist...
         if (!empty($modSettings['messageIconChecks_enable'])) {
             if (!isset($context['icon_sources'][$row['first_icon']])) {
                 $context['icon_sources'][$row['first_icon']] = file_exists($settings['theme_dir'] . '/images/post/' . $row['first_icon'] . '.png') ? 'images_url' : 'default_images_url';
             }
             if (!isset($context['icon_sources'][$row['last_icon']])) {
                 $context['icon_sources'][$row['last_icon']] = file_exists($settings['theme_dir'] . '/images/post/' . $row['last_icon'] . '.png') ? 'images_url' : 'default_images_url';
             }
         } else {
             if (!isset($context['icon_sources'][$row['first_icon']])) {
                 $context['icon_sources'][$row['first_icon']] = 'images_url';
             }
             if (!isset($context['icon_sources'][$row['last_icon']])) {
                 $context['icon_sources'][$row['last_icon']] = 'images_url';
             }
         }
         // 'Print' the topic info.
         $context['topics'][$row['id_topic']] = array('id' => $row['id_topic'], 'first_post' => array('id' => $row['id_first_msg'], 'member' => array('username' => $row['first_member_name'], 'name' => $row['first_display_name'], 'id' => $row['first_id_member'], 'href' => !empty($row['first_id_member']) ? $scripturl . '?action=profile;u=' . $row['first_id_member'] : '', 'link' => !empty($row['first_id_member']) ? '<a href="' . $scripturl . '?action=profile;u=' . $row['first_id_member'] . '" title="' . $txt['profile_of'] . ' ' . $row['first_display_name'] . '" class="preview">' . $row['first_display_name'] . '</a>' : $row['first_display_name']), 'time' => standardTime($row['first_poster_time']), 'html_time' => htmlTime($row['first_poster_time']), 'timestamp' => forum_time(true, $row['first_poster_time']), 'subject' => $row['first_subject'], 'preview' => trim($row['first_body']), 'icon' => $row['first_icon'], 'icon_url' => $settings[$context['icon_sources'][$row['first_icon']]] . '/post/' . $row['first_icon'] . '.png', 'href' => $scripturl . '?topic=' . $row['id_topic'] . '.0', 'link' => '<a href="' . $scripturl . '?topic=' . $row['id_topic'] . '.0">' . $row['first_subject'] . '</a>'), 'last_post' => array('id' => $row['id_last_msg'], 'member' => array('username' => $row['last_member_name'], 'name' => $row['last_display_name'], 'id' => $row['last_id_member'], 'href' => !empty($row['last_id_member']) ? $scripturl . '?action=profile;u=' . $row['last_id_member'] : '', 'link' => !empty($row['last_id_member']) ? '<a href="' . $scripturl . '?action=profile;u=' . $row['last_id_member'] . '">' . $row['last_display_name'] . '</a>' : $row['last_display_name']), 'time' => standardTime($row['last_poster_time']), 'html_time' => htmlTime($row['last_poster_time']), 'timestamp' => forum_time(true, $row['last_poster_time']), 'subject' => $row['last_subject'], 'preview' => trim($row['last_body']), 'icon' => $row['last_icon'], 'icon_url' => $settings[$context['icon_sources'][$row['last_icon']]] . '/post/' . $row['last_icon'] . '.png', 'href' => $scripturl . '?topic=' . $row['id_topic'] . ($user_info['is_guest'] ? '.' . (int) ($row['num_replies'] / $context['pageindex_multiplier']) * $context['pageindex_multiplier'] . '#msg' . $row['id_last_msg'] : ($row['num_replies'] == 0 ? '.0' : '.msg' . $row['id_last_msg']) . '#new'), 'link' => '<a href="' . $scripturl . '?topic=' . $row['id_topic'] . ($user_info['is_guest'] ? '.' . (int) ($row['num_replies'] / $context['pageindex_multiplier']) * $context['pageindex_multiplier'] . '#msg' . $row['id_last_msg'] : ($row['num_replies'] == 0 ? '.0' : '.msg' . $row['id_last_msg']) . '#new') . '" ' . ($row['num_replies'] == 0 ? '' : 'rel="nofollow"') . '>' . $row['last_subject'] . '</a>'), 'default_preview' => trim($row[!empty($modSettings['message_index_preview']) && $modSettings['message_index_preview'] == 2 ? 'last_body' : 'first_body']), 'is_sticky' => !empty($modSettings['enableStickyTopics']) && !empty($row['is_sticky']), 'is_locked' => !empty($row['locked']), 'is_poll' => !empty($modSettings['pollMode']) && $row['id_poll'] > 0, 'is_hot' => !empty($modSettings['useLikesNotViews']) ? $row['num_likes'] >= $modSettings['hotTopicPosts'] : $row['num_replies'] >= $modSettings['hotTopicPosts'], 'is_very_hot' => !empty($modSettings['useLikesNotViews']) ? $row['num_likes'] >= $modSettings['hotTopicVeryPosts'] : $row['num_replies'] >= $modSettings['hotTopicVeryPosts'], 'is_posted_in' => false, 'icon' => $row['first_icon'], 'icon_url' => $settings[$context['icon_sources'][$row['first_icon']]] . '/post/' . $row['first_icon'] . '.png', 'subject' => $row['first_subject'], 'new' => $row['new_from'] <= $row['id_msg_modified'], 'new_from' => $row['new_from'], 'newtime' => $row['new_from'], 'new_href' => $scripturl . '?topic=' . $row['id_topic'] . '.msg' . $row['new_from'] . '#new', 'redir_href' => !empty($row['id_redirect_topic']) ? $scripturl . '?topic=' . $row['id_topic'] . '.0;noredir' : '', 'pages' => $pages, 'replies' => comma_format($row['num_replies']), 'views' => comma_format($row['num_views']), 'likes' => comma_format($row['num_likes']), 'approved' => $row['approved'], 'unapproved_posts' => $row['unapproved_posts']);
         if (!empty($settings['avatars_on_indexes'])) {
             $context['topics'][$row['id_topic']]['last_post']['member']['avatar'] = determineAvatar($row);
         }
         determineTopicClass($context['topics'][$row['id_topic']]);
     }
     // Allow addons to add to the $context['topics']
     call_integration_hook('integrate_messageindex_listing', array($topics_info));
     // Fix the sequence of topics if they were retrieved in the wrong order. (for speed reasons...)
     if ($fake_ascending) {
         $context['topics'] = array_reverse($context['topics'], true);
     }
     if (!empty($modSettings['enableParticipation']) && !$user_info['is_guest'] && !empty($topic_ids)) {
         $topics_participated_in = topicsParticipation($user_info['id'], $topic_ids);
         foreach ($topics_participated_in as $participated) {
             $context['topics'][$participated['id_topic']]['is_posted_in'] = true;
             $context['topics'][$participated['id_topic']]['class'] = 'my_' . $context['topics'][$participated['id_topic']]['class'];
         }
     }
     $context['jump_to'] = array('label' => addslashes(un_htmlspecialchars($txt['jump_to'])), 'board_name' => htmlspecialchars(strtr(strip_tags($board_info['name']), array('&amp;' => '&')), ENT_COMPAT, 'UTF-8'), 'child_level' => $board_info['child_level']);
     // Is Quick Moderation active/needed?
     if (!empty($options['display_quick_mod']) && !empty($context['topics'])) {
         $context['can_markread'] = $context['user']['is_logged'];
         $context['can_lock'] = allowedTo('lock_any');
         $context['can_sticky'] = allowedTo('make_sticky') && !empty($modSettings['enableStickyTopics']);
         $context['can_move'] = allowedTo('move_any');
         $context['can_remove'] = allowedTo('remove_any');
         $context['can_merge'] = allowedTo('merge_any');
         // Ignore approving own topics as it's unlikely to come up...
         $context['can_approve'] = $modSettings['postmod_active'] && allowedTo('approve_posts') && !empty($board_info['unapproved_topics']);
         // Can we restore topics?
         $context['can_restore'] = allowedTo('move_any') && !empty($modSettings['recycle_enable']) && $modSettings['recycle_board'] == $board;
         // Set permissions for all the topics.
         foreach ($context['topics'] as $t => $topic) {
             $started = $topic['first_post']['member']['id'] == $user_info['id'];
             $context['topics'][$t]['quick_mod'] = array('lock' => allowedTo('lock_any') || $started && allowedTo('lock_own'), 'sticky' => allowedTo('make_sticky') && !empty($modSettings['enableStickyTopics']), 'move' => allowedTo('move_any') || $started && allowedTo('move_own'), 'modify' => allowedTo('modify_any') || $started && allowedTo('modify_own'), 'remove' => allowedTo('remove_any') || $started && allowedTo('remove_own'), 'approve' => $context['can_approve'] && $topic['unapproved_posts']);
             $context['can_lock'] |= $started && allowedTo('lock_own');
             $context['can_move'] |= $started && allowedTo('move_own');
             $context['can_remove'] |= $started && allowedTo('remove_own');
         }
         // Can we use quick moderation checkboxes?
         if ($options['display_quick_mod'] == 1) {
             $context['can_quick_mod'] = $context['user']['is_logged'] || $context['can_approve'] || $context['can_remove'] || $context['can_lock'] || $context['can_sticky'] || $context['can_move'] || $context['can_merge'] || $context['can_restore'];
         } else {
             $context['can_quick_mod'] = $context['can_remove'] || $context['can_lock'] || $context['can_sticky'] || $context['can_move'];
         }
     }
     if (!empty($context['can_quick_mod']) && $options['display_quick_mod'] == 1) {
         $context['qmod_actions'] = array('approve', 'remove', 'lock', 'sticky', 'move', 'merge', 'restore', 'markread');
         call_integration_hook('integrate_quick_mod_actions');
     }
     if (!empty($context['boards']) && $context['start'] == 0) {
         $template_layers->add('display_child_boards');
     }
     // If there are children, but no topics and no ability to post topics...
     $context['no_topic_listing'] = !empty($context['boards']) && empty($context['topics']) && !$context['can_post_new'];
     $template_layers->add('topic_listing');
     addJavascriptVar(array('notification_board_notice' => $context['is_marked_notify'] ? $txt['notification_disable_board'] : $txt['notification_enable_board']), true);
     // Build the message index button array.
     $context['normal_buttons'] = array('new_topic' => array('test' => 'can_post_new', 'text' => 'new_topic', 'image' => 'new_topic.png', 'lang' => true, 'url' => $scripturl . '?action=post;board=' . $context['current_board'] . '.0', 'active' => true), 'notify' => array('test' => 'can_mark_notify', 'text' => $context['is_marked_notify'] ? 'unnotify' : 'notify', 'image' => ($context['is_marked_notify'] ? 'un' : '') . 'notify.png', 'lang' => true, 'custom' => 'onclick="return notifyboardButton(this);"', 'url' => $scripturl . '?action=notifyboard;sa=' . ($context['is_marked_notify'] ? 'off' : 'on') . ';board=' . $context['current_board'] . '.' . $context['start'] . ';' . $context['session_var'] . '=' . $context['session_id']));
     // They can only mark read if they are logged in and it's enabled!
     if (!$user_info['is_guest'] && $settings['show_mark_read']) {
         $context['normal_buttons']['markread'] = array('text' => 'mark_read_short', 'image' => 'markread.png', 'lang' => true, 'url' => $scripturl . '?action=markasread;sa=board;board=' . $context['current_board'] . '.0;' . $context['session_var'] . '=' . $context['session_id'], 'custom' => 'onclick="return markboardreadButton(this);"');
     }
     // Allow adding new buttons easily.
     call_integration_hook('integrate_messageindex_buttons');
 }