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<?php

/**
 * Find and retrieve information about recently posted topics, messages, and the like.
 *
 * Simple Machines Forum (SMF)
 *
 * @package SMF
 * @author Simple Machines https://www.simplemachines.org
 * @copyright 2020 Simple Machines and individual contributors
 * @license https://www.simplemachines.org/about/smf/license.php BSD
 *
 * @version 2.1 RC2
 */

if (!defined('SMF'))
    die('No direct access...');

/**
 * Get the latest post made on the system
 *
 * - respects approved, recycled, and board permissions
 * - @todo is this even used anywhere?
 *
 * @return array An array of information about the last post that you can see
 */
function getLastPost()
{
    global $scripturl, $modSettings, $smcFunc;

    // Find it by the board - better to order by board than sort the entire messages table.
    $request = $smcFunc['db_query']('substring', '
        SELECT m.poster_time, m.subject, m.id_topic, m.poster_name, SUBSTRING(m.body, 1, 385) AS body,
            m.smileys_enabled
        FROM {db_prefix}messages AS m' . (!empty($modSettings['postmod_active']) ? '
            INNER JOIN {db_prefix}topics AS t ON (t.id_topic = m.id_topic)' : '') . '
        WHERE {query_wanna_see_message_board}' . (!empty($modSettings['recycle_enable']) && $modSettings['recycle_board'] > 0 ? '
            AND m.id_board != {int:recycle_board}' : '') . (!empty($modSettings['postmod_active']) ? '
            AND m.approved = {int:is_approved}
            AND t.approved = {int:is_approved}' : '') . '
        ORDER BY m.id_msg DESC
        LIMIT 1',
        array(
            'recycle_board' => $modSettings['recycle_board'],
            'is_approved' => 1,
        )
    );
    if ($smcFunc['db_num_rows']($request) == 0)
        return array();
    $row = $smcFunc['db_fetch_assoc']($request);
    $smcFunc['db_free_result']($request);

    // Censor the subject and post...
    censorText($row['subject']);
    censorText($row['body']);

    $row['body'] = strip_tags(strtr(parse_bbc($row['body'], $row['smileys_enabled']), array('<br>' => '&#10;')));
    if ($smcFunc['strlen']($row['body']) > 128)
        $row['body'] = $smcFunc['substr']($row['body'], 0, 128) . '...';

    // Send the data.
    return array(
        'topic' => $row['id_topic'],
        'subject' => $row['subject'],
        'short_subject' => shorten_subject($row['subject'], 24),
        'preview' => $row['body'],
        'time' => timeformat($row['poster_time']),
        'timestamp' => forum_time(true, $row['poster_time']),
        'href' => $scripturl . '?topic=' . $row['id_topic'] . '.new;topicseen#new',
        'link' => '<a href="' . $scripturl . '?topic=' . $row['id_topic'] . '.new;topicseen#new">' . $row['subject'] . '</a>'
    );
}

/**
 * Find the ten most recent posts.
 */
function RecentPosts()
{
    global $txt, $scripturl, $user_info, $context, $modSettings, $board, $smcFunc, $cache_enable;

    loadTemplate('Recent');
    $context['page_title'] = $txt['recent_posts'];
    $context['sub_template'] = 'recent';

    $context['is_redirect'] = false;

    if (isset($_REQUEST['start']) && $_REQUEST['start'] > 95)
        $_REQUEST['start'] = 95;

    $_REQUEST['start'] = (int) $_REQUEST['start'];

    $query_parameters = array();
    if (!empty($_REQUEST['c']) && empty($board))
    {
        $_REQUEST['c'] = explode(',', $_REQUEST['c']);
        foreach ($_REQUEST['c'] as $i => $c)
            $_REQUEST['c'][$i] = (int) $c;

        if (count($_REQUEST['c']) == 1)
        {
            $request = $smcFunc['db_query']('', '
                SELECT name
                FROM {db_prefix}categories
                WHERE id_cat = {int:id_cat}
                LIMIT 1',
                array(
                    'id_cat' => $_REQUEST['c'][0],
                )
            );
            list ($name) = $smcFunc['db_fetch_row']($request);
            $smcFunc['db_free_result']($request);

            if (empty($name))
                fatal_lang_error('no_access', false);

            $context['linktree'][] = array(
                'url' => $scripturl . '#c' . (int) $_REQUEST['c'],
                'name' => $name
            );
        }

        $recycling = !empty($modSettings['recycle_enable']) && !empty($modSettings['recycle_board']);

        $request = $smcFunc['db_query']('', '
            SELECT b.id_board, b.num_posts
            FROM {db_prefix}boards AS b
            WHERE b.id_cat IN ({array_int:category_list})
                AND b.redirect = {string:empty}' . ($recycling ? '
                AND b.id_board != {int:recycle_board}' : '') . '
                AND {query_wanna_see_board}',
            array(
                'category_list' => $_REQUEST['c'],
                'empty' => '',
                'recycle_board' => !empty($modSettings['recycle_board']) ? $modSettings['recycle_board'] : 0,
            )
        );
        $total_cat_posts = 0;
        $boards = array();
        while ($row = $smcFunc['db_fetch_assoc']($request))
        {
            $boards[] = $row['id_board'];
            $total_cat_posts += $row['num_posts'];
        }
        $smcFunc['db_free_result']($request);

        if (empty($boards))
            fatal_lang_error('error_no_boards_selected');

        $query_this_board = 'm.id_board IN ({array_int:boards})';
        $query_parameters['boards'] = $boards;

        // If this category has a significant number of posts in it...
        if ($total_cat_posts > 100 && $total_cat_posts > $modSettings['totalMessages'] / 15)
        {
            $query_this_board .= '
                    AND m.id_msg >= {int:max_id_msg}';
            $query_parameters['max_id_msg'] = max(0, $modSettings['maxMsgID'] - 400 - $_REQUEST['start'] * 7);
        }

        $context['page_index'] = constructPageIndex($scripturl . '?action=recent;c=' . implode(',', $_REQUEST['c']), $_REQUEST['start'], min(100, $total_cat_posts), 10, false);
    }
    elseif (!empty($_REQUEST['boards']))
    {
        $_REQUEST['boards'] = explode(',', $_REQUEST['boards']);
        foreach ($_REQUEST['boards'] as $i => $b)
            $_REQUEST['boards'][$i] = (int) $b;

        $request = $smcFunc['db_query']('', '
            SELECT b.id_board, b.num_posts
            FROM {db_prefix}boards AS b
            WHERE b.id_board IN ({array_int:board_list})
                AND b.redirect = {string:empty}
                AND {query_see_board}
            LIMIT {int:limit}',
            array(
                'board_list' => $_REQUEST['boards'],
                'limit' => count($_REQUEST['boards']),
                'empty' => '',
            )
        );
        $total_posts = 0;
        $boards = array();
        while ($row = $smcFunc['db_fetch_assoc']($request))
        {
            $boards[] = $row['id_board'];
            $total_posts += $row['num_posts'];
        }
        $smcFunc['db_free_result']($request);

        if (empty($boards))
            fatal_lang_error('error_no_boards_selected');

        $query_this_board = 'm.id_board IN ({array_int:boards})';
        $query_parameters['boards'] = $boards;

        // If these boards have a significant number of posts in them...
        if ($total_posts > 100 && $total_posts > $modSettings['totalMessages'] / 12)
        {
            $query_this_board .= '
                    AND m.id_msg >= {int:max_id_msg}';
            $query_parameters['max_id_msg'] = max(0, $modSettings['maxMsgID'] - 500 - $_REQUEST['start'] * 9);
        }

        $context['page_index'] = constructPageIndex($scripturl . '?action=recent;boards=' . implode(',', $_REQUEST['boards']), $_REQUEST['start'], min(100, $total_posts), 10, false);
    }
    elseif (!empty($board))
    {
        $request = $smcFunc['db_query']('', '
            SELECT num_posts, redirect
            FROM {db_prefix}boards
            WHERE id_board = {int:current_board}
            LIMIT 1',
            array(
                'current_board' => $board,
            )
        );
        list ($total_posts, $redirect) = $smcFunc['db_fetch_row']($request);
        $smcFunc['db_free_result']($request);

        // If this is a redirection board, don't bother counting topics here...
        if ($redirect != '')
        {
            $total_posts = 0;
            $context['is_redirect'] = true;
        }

        $query_this_board = 'm.id_board = {int:board}';
        $query_parameters['board'] = $board;

        // If this board has a significant number of posts in it...
        if ($total_posts > 80 && $total_posts > $modSettings['totalMessages'] / 10)
        {
            $query_this_board .= '
                    AND m.id_msg >= {int:max_id_msg}';
            $query_parameters['max_id_msg'] = max(0, $modSettings['maxMsgID'] - 600 - $_REQUEST['start'] * 10);
        }

        $context['page_index'] = constructPageIndex($scripturl . '?action=recent;board=' . $board . '.%1$d', $_REQUEST['start'], min(100, $total_posts), 10, true);
    }
    else
    {
        $query_this_board = '{query_wanna_see_message_board}' . (!empty($modSettings['recycle_enable']) && $modSettings['recycle_board'] > 0 ? '
                    AND m.id_board != {int:recycle_board}' : '') . '
                    AND m.id_msg >= {int:max_id_msg}';
        $query_parameters['max_id_msg'] = max(0, $modSettings['maxMsgID'] - 100 - $_REQUEST['start'] * 6);
        $query_parameters['recycle_board'] = $modSettings['recycle_board'];

        $query_these_boards = '{query_wanna_see_board}' . (!empty($modSettings['recycle_enable']) && $modSettings['recycle_board'] > 0 ? '
                    AND b.id_board != {int:recycle_board}' : '');
        $query_these_boards_params = $query_parameters;
        unset($query_these_boards_params['max_id_msg']);

        $get_num_posts = $smcFunc['db_query']('', '
            SELECT COALESCE(SUM(b.num_posts), 0)
            FROM {db_prefix}boards AS b
            WHERE ' . $query_these_boards . '
                AND b.redirect = {string:empty}',
            array_merge($query_these_boards_params, array('empty' => ''))
        );

        list($db_num_posts) = $smcFunc['db_fetch_row']($get_num_posts);
        $num_posts = min(100, $db_num_posts);

        $smcFunc['db_free_result']($get_num_posts);

        $context['page_index'] = constructPageIndex($scripturl . '?action=recent', $_REQUEST['start'], $num_posts, 10, false);
    }

    $context['linktree'][] = array(
        'url' => $scripturl . '?action=recent' . (empty($board) ? (empty($_REQUEST['c']) ? '' : ';c=' . (int) $_REQUEST['c']) : ';board=' . $board . '.0'),
        'name' => $context['page_title']
    );

    // If you selected a redirection board, don't try getting posts for it...
    if ($context['is_redirect'])
        $messages = 0;

    $key = 'recent-' . $user_info['id'] . '-' . md5($smcFunc['json_encode'](array_diff_key($query_parameters, array('max_id_msg' => 0)))) . '-' . (int) $_REQUEST['start'];
    if (!$context['is_redirect'] && (empty($cache_enable) || ($messages = cache_get_data($key, 120)) == null))
    {
        $done = false;
        while (!$done)
        {
            // Find the 10 most recent messages they can *view*.
            // @todo SLOW This query is really slow still, probably?
            $request = $smcFunc['db_query']('', '
                SELECT m.id_msg
                FROM {db_prefix}messages AS m ' . (!empty($modSettings['postmod_active']) ? '
                    INNER JOIN {db_prefix}topics AS t ON (t.id_topic = m.id_topic)' : '') . '
                WHERE ' . $query_this_board . (!empty($modSettings['postmod_active']) ? '
                    AND m.approved = {int:is_approved}
                    AND t.approved = {int:is_approved}' : '') . '
                ORDER BY m.id_msg DESC
                LIMIT {int:offset}, {int:limit}',
                array_merge($query_parameters, array(
                    'is_approved' => 1,
                    'offset' => $_REQUEST['start'],
                    'limit' => 10,
                ))
            );
            // If we don't have 10 results, try again with an unoptimized version covering all rows, and cache the result.
            if (isset($query_parameters['max_id_msg']) && $smcFunc['db_num_rows']($request) < 10)
            {
                $smcFunc['db_free_result']($request);
                $query_this_board = str_replace('AND m.id_msg >= {int:max_id_msg}', '', $query_this_board);
                $cache_results = true;
                unset($query_parameters['max_id_msg']);
            }
            else
                $done = true;
        }
        $messages = array();
        while ($row = $smcFunc['db_fetch_assoc']($request))
            $messages[] = $row['id_msg'];
        $smcFunc['db_free_result']($request);
        if (!empty($cache_results))
            cache_put_data($key, $messages, 120);
    }

    // Nothing here... Or at least, nothing you can see...
    if (empty($messages))
    {
        $context['posts'] = array();
        return;
    }

    // Get all the most recent posts.
    $request = $smcFunc['db_query']('', '
        SELECT
            m.id_msg, m.subject, m.smileys_enabled, m.poster_time, m.body, m.id_topic, t.id_board, b.id_cat,
            b.name AS bname, c.name AS cname, t.num_replies, m.id_member, m2.id_member AS id_first_member,
            COALESCE(mem2.real_name, m2.poster_name) AS first_poster_name, t.id_first_msg,
            COALESCE(mem.real_name, m.poster_name) AS poster_name, t.id_last_msg
        FROM {db_prefix}messages AS m
            INNER JOIN {db_prefix}topics AS t ON (t.id_topic = m.id_topic)
            INNER JOIN {db_prefix}boards AS b ON (b.id_board = t.id_board)
            INNER JOIN {db_prefix}categories AS c ON (c.id_cat = b.id_cat)
            INNER JOIN {db_prefix}messages AS m2 ON (m2.id_msg = t.id_first_msg)
            LEFT JOIN {db_prefix}members AS mem ON (mem.id_member = m.id_member)
            LEFT JOIN {db_prefix}members AS mem2 ON (mem2.id_member = m2.id_member)
        WHERE m.id_msg IN ({array_int:message_list})
        ORDER BY m.id_msg DESC
        LIMIT {int:limit}',
        array(
            'message_list' => $messages,
            'limit' => count($messages),
        )
    );
    $counter = $_REQUEST['start'] + 1;
    $context['posts'] = array();
    $board_ids = array('own' => array(), 'any' => array());
    while ($row = $smcFunc['db_fetch_assoc']($request))
    {
        // Censor everything.
        censorText($row['body']);
        censorText($row['subject']);

        // BBC-atize the message.
        $row['body'] = parse_bbc($row['body'], $row['smileys_enabled'], $row['id_msg']);

        // And build the array.
        $context['posts'][$row['id_msg']] = array(
            'id' => $row['id_msg'],
            'counter' => $counter++,
            'category' => array(
                'id' => $row['id_cat'],
                'name' => $row['cname'],
                'href' => $scripturl . '#c' . $row['id_cat'],
                'link' => '<a href="' . $scripturl . '#c' . $row['id_cat'] . '">' . $row['cname'] . '</a>'
            ),
            'board' => array(
                'id' => $row['id_board'],
                'name' => $row['bname'],
                'href' => $scripturl . '?board=' . $row['id_board'] . '.0',
                'link' => '<a href="' . $scripturl . '?board=' . $row['id_board'] . '.0">' . $row['bname'] . '</a>'
            ),
            'topic' => $row['id_topic'],
            'href' => $scripturl . '?topic=' . $row['id_topic'] . '.msg' . $row['id_msg'] . '#msg' . $row['id_msg'],
            'link' => '<a href="' . $scripturl . '?topic=' . $row['id_topic'] . '.msg' . $row['id_msg'] . '#msg' . $row['id_msg'] . '" rel="nofollow" title="' . $row['subject'] . '">' . shorten_subject($row['subject'], 30) . '</a>',
            'start' => $row['num_replies'],
            'subject' => $row['subject'],
            'shorten_subject' => shorten_subject($row['subject'], 30),
            'time' => timeformat($row['poster_time']),
            'timestamp' => forum_time(true, $row['poster_time']),
            'first_poster' => array(
                'id' => $row['id_first_member'],
                'name' => $row['first_poster_name'],
                'href' => empty($row['id_first_member']) ? '' : $scripturl . '?action=profile;u=' . $row['id_first_member'],
                'link' => empty($row['id_first_member']) ? $row['first_poster_name'] : '<a href="' . $scripturl . '?action=profile;u=' . $row['id_first_member'] . '">' . $row['first_poster_name'] . '</a>'
            ),
            'poster' => array(
                'id' => $row['id_member'],
                'name' => $row['poster_name'],
                'href' => empty($row['id_member']) ? '' : $scripturl . '?action=profile;u=' . $row['id_member'],
                'link' => empty($row['id_member']) ? $row['poster_name'] : '<a href="' . $scripturl . '?action=profile;u=' . $row['id_member'] . '">' . $row['poster_name'] . '</a>'
            ),
            'message' => $row['body'],
            'can_reply' => false,
            'can_delete' => false,
            'delete_possible' => ($row['id_first_msg'] != $row['id_msg'] || $row['id_last_msg'] == $row['id_msg']) && (empty($modSettings['edit_disable_time']) || $row['poster_time'] + $modSettings['edit_disable_time'] * 60 >= time()),
            'css_class' => 'windowbg',
        );

        if ($user_info['id'] == $row['id_first_member'])
            $board_ids['own'][$row['id_board']][] = $row['id_msg'];
        $board_ids['any'][$row['id_board']][] = $row['id_msg'];
    }
    $smcFunc['db_free_result']($request);

    // There might be - and are - different permissions between any and own.
    $permissions = array(
        'own' => array(
            'post_reply_own' => 'can_reply',
            'delete_own' => 'can_delete',
        ),
        'any' => array(
            'post_reply_any' => 'can_reply',
            'delete_any' => 'can_delete',
        )
    );

    // Create an array for the permissions.
    $boards_can = boardsAllowedTo(array_keys(iterator_to_array(
        new RecursiveIteratorIterator(new RecursiveArrayIterator($permissions)))
    ), true, false);

    // Now go through all the permissions, looking for boards they can do it on.
    foreach ($permissions as $type => $list)
    {
        foreach ($list as $permission => $allowed)
        {
            // They can do it on these boards...
            $boards = $boards_can[$permission];

            // If 0 is the only thing in the array, they can do it everywhere!
            if (!empty($boards) && $boards[0] == 0)
                $boards = array_keys($board_ids[$type]);

            // Go through the boards, and look for posts they can do this on.
            foreach ($boards as $board_id)
            {
                // Hmm, they have permission, but there are no topics from that board on this page.
                if (!isset($board_ids[$type][$board_id]))
                    continue;

                // Okay, looks like they can do it for these posts.
                foreach ($board_ids[$type][$board_id] as $counter)
                    if ($type == 'any' || $context['posts'][$counter]['poster']['id'] == $user_info['id'])
                        $context['posts'][$counter][$allowed] = true;
            }
        }
    }

    $quote_enabled = empty($modSettings['disabledBBC']) || !in_array('quote', explode(',', $modSettings['disabledBBC']));
    foreach ($context['posts'] as $counter => $dummy)
    {
        // Some posts - the first posts - can't just be deleted.
        $context['posts'][$counter]['can_delete'] &= $context['posts'][$counter]['delete_possible'];

        // And some cannot be quoted...
        $context['posts'][$counter]['can_quote'] = $context['posts'][$counter]['can_reply'] && $quote_enabled;
    }

    // Last but not least, the quickbuttons
    foreach ($context['posts'] as $key => $post)
    {
        $context['posts'][$key]['quickbuttons'] = array(
            'reply' => array(
                'label' => $txt['reply'],
                'href' => $scripturl.'?action=post;topic='.$post['topic'].'.'.$post['start'],
                'icon' => 'reply_button',
                'show' => $post['can_reply']
            ),
            'quote' => array(
                'label' => $txt['quote_action'],
                'href' => $scripturl.'?action=post;topic='.$post['topic'].'.'.$post['start'].';quote='.$post['id'],
                'icon' => 'quote',
                'show' => $post['can_quote']
            ),
            'delete' => array(
                'label' => $txt['remove'],
                'href' => $scripturl.'?action=deletemsg;msg='.$post['id'].';topic='.$post['topic'].';recent;'.$context['session_var'].'='.$context['session_id'],
                'javascript' => 'data-confirm="'.$txt['remove_message'].'" class="you_sure"',
                'icon' => 'remove_button',
                'show' => $post['can_delete']
            ),
        );
    }

    // Allow last minute changes.
    call_integration_hook('integrate_recent_RecentPosts');
}

/**
 * Find unread topics and replies.
 */
function UnreadTopics()
{
    global $board, $txt, $scripturl, $sourcedir;
    global $user_info, $context, $settings, $modSettings, $smcFunc, $options;

    // Guests can't have unread things, we don't know anything about them.
    is_not_guest();

    // Prefetching + lots of MySQL work = bad mojo.
    if (isset($_SERVER['HTTP_X_MOZ']) && $_SERVER['HTTP_X_MOZ'] == 'prefetch')
    {
        ob_end_clean();
        send_http_status(403);
        die;
    }

    $context['showCheckboxes'] = !empty($options['display_quick_mod']) && $options['display_quick_mod'] == 1;

    $context['showing_all_topics'] = isset($_GET['all']);
    $context['start'] = (int) $_REQUEST['start'];
    $context['topics_per_page'] = empty($modSettings['disableCustomPerPage']) && !empty($options['topics_per_page']) ? $options['topics_per_page'] : $modSettings['defaultMaxTopics'];
    if ($_REQUEST['action'] == 'unread')
        $context['page_title'] = $context['showing_all_topics'] ? $txt['unread_topics_all'] : $txt['unread_topics_visit'];
    else
        $context['page_title'] = $txt['unread_replies'];

    if ($context['showing_all_topics'] && !empty($context['load_average']) && !empty($modSettings['loadavg_allunread']) && $context['load_average'] >= $modSettings['loadavg_allunread'])
        fatal_lang_error('loadavg_allunread_disabled', false);
    elseif ($_REQUEST['action'] != 'unread' && !empty($context['load_average']) && !empty($modSettings['loadavg_unreadreplies']) && $context['load_average'] >= $modSettings['loadavg_unreadreplies'])
        fatal_lang_error('loadavg_unreadreplies_disabled', false);
    elseif (!$context['showing_all_topics'] && $_REQUEST['action'] == 'unread' && !empty($context['load_average']) && !empty($modSettings['loadavg_unread']) && $context['load_average'] >= $modSettings['loadavg_unread'])
        fatal_lang_error('loadavg_unread_disabled', false);

    // Parameters for the main query.
    $query_parameters = array();

    // Are we specifying any specific board?
    if (isset($_REQUEST['children']) && (!empty($board) || !empty($_REQUEST['boards'])))
    {
        $boards = array();

        if (!empty($_REQUEST['boards']))
        {
            $_REQUEST['boards'] = explode(',', $_REQUEST['boards']);
            foreach ($_REQUEST['boards'] as $b)
                $boards[] = (int) $b;
        }

        if (!empty($board))
            $boards[] = (int) $board;

        // The easiest thing is to just get all the boards they can see, but since we've specified the top of tree we ignore some of them
        $request = $smcFunc['db_query']('', '
            SELECT b.id_board, b.id_parent
            FROM {db_prefix}boards AS b
            WHERE {query_wanna_see_board}
                AND b.child_level > {int:no_child}
                AND b.id_board NOT IN ({array_int:boards})
            ORDER BY child_level ASC',
            array(
                'no_child' => 0,
                'boards' => $boards,
            )
        );

        while ($row = $smcFunc['db_fetch_assoc']($request))
            if (in_array($row['id_parent'], $boards))
                $boards[] = $row['id_board'];

        $smcFunc['db_free_result']($request);

        if (empty($boards))
            fatal_lang_error('error_no_boards_selected');

        $query_this_board = 'id_board IN ({array_int:boards})';
        $query_parameters['boards'] = $boards;
        $context['querystring_board_limits'] = ';boards=' . implode(',', $boards) . ';start=%d';
    }
    elseif (!empty($board))
    {
        $query_this_board = 'id_board = {int:board}';
        $query_parameters['board'] = $board;
        $context['querystring_board_limits'] = ';board=' . $board . '.%1$d';
    }
    elseif (!empty($_REQUEST['boards']))
    {
        $_REQUEST['boards'] = explode(',', $_REQUEST['boards']);
        foreach ($_REQUEST['boards'] as $i => $b)
            $_REQUEST['boards'][$i] = (int) $b;

        $request = $smcFunc['db_query']('', '
            SELECT b.id_board
            FROM {db_prefix}boards AS b
            WHERE {query_see_board}
                AND b.id_board IN ({array_int:board_list})',
            array(
                'board_list' => $_REQUEST['boards'],
            )
        );
        $boards = array();
        while ($row = $smcFunc['db_fetch_assoc']($request))
            $boards[] = $row['id_board'];
        $smcFunc['db_free_result']($request);

        if (empty($boards))
            fatal_lang_error('error_no_boards_selected');

        $query_this_board = 'id_board IN ({array_int:boards})';
        $query_parameters['boards'] = $boards;
        $context['querystring_board_limits'] = ';boards=' . implode(',', $boards) . ';start=%1$d';
    }
    elseif (!empty($_REQUEST['c']))
    {
        $_REQUEST['c'] = explode(',', $_REQUEST['c']);
        foreach ($_REQUEST['c'] as $i => $c)
            $_REQUEST['c'][$i] = (int) $c;

        $see_board = isset($_REQUEST['action']) && $_REQUEST['action'] == 'unreadreplies' ? 'query_see_board' : 'query_wanna_see_board';

        $request = $smcFunc['db_query']('', '
            SELECT b.id_board
            FROM {db_prefix}boards AS b
            WHERE ' . $user_info[$see_board] . '
                AND b.id_cat IN ({array_int:id_cat})',
            array(
                'id_cat' => $_REQUEST['c'],
            )
        );
        $boards = array();
        while ($row = $smcFunc['db_fetch_assoc']($request))
            $boards[] = $row['id_board'];
        $smcFunc['db_free_result']($request);

        if (empty($boards))
            fatal_lang_error('error_no_boards_selected');

        $query_this_board = 'id_board IN ({array_int:boards})';
        $query_parameters['boards'] = $boards;
        $context['querystring_board_limits'] = ';c=' . implode(',', $_REQUEST['c']) . ';start=%1$d';
    }
    else
    {
        $see_board = isset($_REQUEST['action']) && $_REQUEST['action'] == 'unreadreplies' ? 'query_see_board' : 'query_wanna_see_board';
        // Don't bother to show deleted posts!
        $request = $smcFunc['db_query']('', '
            SELECT b.id_board
            FROM {db_prefix}boards AS b
            WHERE ' . $user_info[$see_board] . (!empty($modSettings['recycle_enable']) && $modSettings['recycle_board'] > 0 ? '
                AND b.id_board != {int:recycle_board}' : ''),
            array(
                'recycle_board' => (int) $modSettings['recycle_board'],
            )
        );
        $boards = array();
        while ($row = $smcFunc['db_fetch_assoc']($request))
            $boards[] = $row['id_board'];
        $smcFunc['db_free_result']($request);

        if (empty($boards))
            fatal_lang_error('error_no_boards_available', false);

        $query_this_board = 'id_board IN ({array_int:boards})';
        $query_parameters['boards'] = $boards;
        $context['querystring_board_limits'] = ';start=%1$d';
        $context['no_board_limits'] = true;
    }

    $sort_methods = array(
        'subject' => 'ms.subject',
        'starter' => 'COALESCE(mems.real_name, ms.poster_name)',
        'replies' => 't.num_replies',
        'views' => 't.num_views',
        'first_post' => 't.id_topic',
        'last_post' => 't.id_last_msg'
    );

    // The default is the most logical: newest first.
    if (!isset($_REQUEST['sort']) || !isset($sort_methods[$_REQUEST['sort']]))
    {
        $context['sort_by'] = 'last_post';
        $_REQUEST['sort'] = 't.id_last_msg';
        $ascending = isset($_REQUEST['asc']);

        $context['querystring_sort_limits'] = $ascending ? ';asc' : '';
    }
    // But, for other methods the default sort is ascending.
    else
    {
        $context['sort_by'] = $_REQUEST['sort'];
        $_REQUEST['sort'] = $sort_methods[$_REQUEST['sort']];
        $ascending = !isset($_REQUEST['desc']);

        $context['querystring_sort_limits'] = ';sort=' . $context['sort_by'] . ($ascending ? '' : ';desc');
    }
    $context['sort_direction'] = $ascending ? 'up' : 'down';

    if (!empty($_REQUEST['c']) && is_array($_REQUEST['c']) && count($_REQUEST['c']) == 1)
    {
        $request = $smcFunc['db_query']('', '
            SELECT name
            FROM {db_prefix}categories
            WHERE id_cat = {int:id_cat}
            LIMIT 1',
            array(
                'id_cat' => (int) $_REQUEST['c'][0],
            )
        );
        list ($name) = $smcFunc['db_fetch_row']($request);
        $smcFunc['db_free_result']($request);

        $context['linktree'][] = array(
            'url' => $scripturl . '#c' . (int) $_REQUEST['c'][0],
            'name' => $name
        );
    }

    $context['linktree'][] = array(
        'url' => $scripturl . '?action=' . $_REQUEST['action'] . sprintf($context['querystring_board_limits'], 0) . $context['querystring_sort_limits'],
        'name' => $_REQUEST['action'] == 'unread' ? $txt['unread_topics_visit'] : $txt['unread_replies']
    );

    if ($context['showing_all_topics'])
        $context['linktree'][] = array(
            'url' => $scripturl . '?action=' . $_REQUEST['action'] . ';all' . sprintf($context['querystring_board_limits'], 0) . $context['querystring_sort_limits'],
            'name' => $txt['unread_topics_all']
        );
    else
        $txt['unread_topics_visit_none'] = strtr($txt['unread_topics_visit_none'], array('?action=unread;all' => '?action=unread;all' . sprintf($context['querystring_board_limits'], 0) . $context['querystring_sort_limits']));

    loadTemplate('Recent');
    loadTemplate('MessageIndex');
    $context['sub_template'] = $_REQUEST['action'] == 'unread' ? 'unread' : 'replies';

    // Setup the default topic icons... for checking they exist and the like ;)
    $context['icon_sources'] = array();
    foreach ($context['stable_icons'] as $icon)
        $context['icon_sources'][$icon] = 'images_url';

    $is_topics = $_REQUEST['action'] == 'unread';

    // This part is the same for each query.
    $select_clause = '
        ms.subject AS first_subject, ms.poster_time AS first_poster_time, ms.id_topic, t.id_board, b.name AS bname,
        t.num_replies, t.num_views, ms.id_member AS id_first_member, ml.id_member AS id_last_member,' . (!empty($settings['avatars_on_indexes']) ? ' meml.avatar, meml.email_address, mems.avatar AS first_poster_avatar, mems.email_address AS first_poster_email, COALESCE(af.id_attach, 0) AS first_poster_id_attach, af.filename AS first_poster_filename, af.attachment_type AS first_poster_attach_type, COALESCE(al.id_attach, 0) AS last_poster_id_attach, al.filename AS last_poster_filename, al.attachment_type AS last_poster_attach_type,' : '') . '
        ml.poster_time AS last_poster_time, COALESCE(mems.real_name, ms.poster_name) AS first_poster_name,
        COALESCE(meml.real_name, ml.poster_name) AS last_poster_name, ml.subject AS last_subject,
        ml.icon AS last_icon, ms.icon AS first_icon, t.id_poll, t.is_sticky, t.locked, ml.modified_time AS last_modified_time,
        COALESCE(lt.id_msg, lmr.id_msg, -1) + 1 AS new_from, SUBSTRING(ml.body, 1, 385) AS last_body,
        SUBSTRING(ms.body, 1, 385) AS first_body, ml.smileys_enabled AS last_smileys, ms.smileys_enabled AS first_smileys, t.id_first_msg, t.id_last_msg';

    if ($context['showing_all_topics'])
    {
        if (!empty($board))
        {
            $request = $smcFunc['db_query']('', '
                SELECT MIN(id_msg)
                FROM {db_prefix}log_mark_read
                WHERE id_member = {int:current_member}
                    AND id_board = {int:current_board}',
                array(
                    'current_board' => $board,
                    'current_member' => $user_info['id'],
                )
            );
            list ($earliest_msg) = $smcFunc['db_fetch_row']($request);
            $smcFunc['db_free_result']($request);
        }
        else
        {
            $request = $smcFunc['db_query']('', '
                SELECT MIN(lmr.id_msg)
                FROM {db_prefix}boards AS b
                    LEFT JOIN {db_prefix}log_mark_read AS lmr ON (lmr.id_board = b.id_board AND lmr.id_member = {int:current_member})
                WHERE {query_see_board}',
                array(
                    'current_member' => $user_info['id'],
                )
            );
            list ($earliest_msg) = $smcFunc['db_fetch_row']($request);
            $smcFunc['db_free_result']($request);
        }

        // This is needed in case of topics marked unread.
        if (empty($earliest_msg))
            $earliest_msg = 0;
        else
        {
            // Using caching, when possible, to ignore the below slow query.
            if (isset($_SESSION['cached_log_time']) && $_SESSION['cached_log_time'][0] + 45 > time())
                $earliest_msg2 = $_SESSION['cached_log_time'][1];
            else
            {
                // This query is pretty slow, but it's needed to ensure nothing crucial is ignored.
                $request = $smcFunc['db_query']('', '
                    SELECT MIN(id_msg)
                    FROM {db_prefix}log_topics
                    WHERE id_member = {int:current_member}',
                    array(
                        'current_member' => $user_info['id'],
                    )
                );
                list ($earliest_msg2) = $smcFunc['db_fetch_row']($request);
                $smcFunc['db_free_result']($request);

                // In theory this could be zero, if the first ever post is unread, so fudge it ;)
                if ($earliest_msg2 == 0)
                    $earliest_msg2 = -1;

                $_SESSION['cached_log_time'] = array(time(), $earliest_msg2);
            }

            $earliest_msg = min($earliest_msg2, $earliest_msg);
        }
    }

    // @todo Add modified_time in for log_time check?

    if ($modSettings['totalMessages'] > 100000 && $context['showing_all_topics'])
    {
        $smcFunc['db_query']('', '
            DROP TABLE IF EXISTS {db_prefix}log_topics_unread',
            array(
            )
        );

        // Let's copy things out of the log_topics table, to reduce searching.
        $have_temp_table = $smcFunc['db_query']('', '
            CREATE TEMPORARY TABLE {db_prefix}log_topics_unread (
                PRIMARY KEY (id_topic)
            )
            SELECT lt.id_topic, lt.id_msg
            FROM {db_prefix}topics AS t
                INNER JOIN {db_prefix}log_topics AS lt ON (lt.id_topic = t.id_topic)
            WHERE lt.id_member = {int:current_member}
                AND t.' . $query_this_board . (empty($earliest_msg) ? '' : '
                AND t.id_last_msg > {int:earliest_msg}') . ($modSettings['postmod_active'] ? '
                AND t.approved = {int:is_approved}' : '') . ' AND lt.unwatched != 1',
            array_merge($query_parameters, array(
                'current_member' => $user_info['id'],
                'earliest_msg' => !empty($earliest_msg) ? $earliest_msg : 0,
                'is_approved' => 1,
                'db_error_skip' => true,
            ))
        ) !== false;
    }
    else
        $have_temp_table = false;

    if ($context['showing_all_topics'] && $have_temp_table)
    {
        $request = $smcFunc['db_query']('', '
            SELECT COUNT(*), MIN(t.id_last_msg)
            FROM {db_prefix}topics AS t
                LEFT JOIN {db_prefix}log_topics_unread AS lt ON (lt.id_topic = t.id_topic)
                LEFT JOIN {db_prefix}log_mark_read AS lmr ON (lmr.id_board = t.id_board AND lmr.id_member = {int:current_member})
            WHERE t.' . $query_this_board . (!empty($earliest_msg) ? '
                AND t.id_last_msg > {int:earliest_msg}' : '') . '
                AND COALESCE(lt.id_msg, lmr.id_msg, 0) < t.id_last_msg' . ($modSettings['postmod_active'] ? '
                AND t.approved = {int:is_approved}' : ''),
            array_merge($query_parameters, array(
                'current_member' => $user_info['id'],
                'earliest_msg' => !empty($earliest_msg) ? $earliest_msg : 0,
                'is_approved' => 1,
            ))
        );
        list ($num_topics, $min_message) = $smcFunc['db_fetch_row']($request);
        $smcFunc['db_free_result']($request);

        // Make sure the starting place makes sense and construct the page index.
        $context['page_index'] = constructPageIndex($scripturl . '?action=' . $_REQUEST['action'] . ($context['showing_all_topics'] ? ';all' : '') . $context['querystring_board_limits'] . $context['querystring_sort_limits'], $_REQUEST['start'], $num_topics, $context['topics_per_page'], true);
        $context['current_page'] = (int) $_REQUEST['start'] / $context['topics_per_page'];

        $context['links'] = array(
            'first' => $_REQUEST['start'] >= $context['topics_per_page'] ? $scripturl . '?action=' . $_REQUEST['action'] . ($context['showing_all_topics'] ? ';all' : '') . sprintf($context['querystring_board_limits'], 0) . $context['querystring_sort_limits'] : '',
            'prev' => $_REQUEST['start'] >= $context['topics_per_page'] ? $scripturl . '?action=' . $_REQUEST['action'] . ($context['showing_all_topics'] ? ';all' : '') . sprintf($context['querystring_board_limits'], $_REQUEST['start'] - $context['topics_per_page']) . $context['querystring_sort_limits'] : '',
            'next' => $_REQUEST['start'] + $context['topics_per_page'] < $num_topics ? $scripturl . '?action=' . $_REQUEST['action'] . ($context['showing_all_topics'] ? ';all' : '') . sprintf($context['querystring_board_limits'], $_REQUEST['start'] + $context['topics_per_page']) . $context['querystring_sort_limits'] : '',
            'last' => $_REQUEST['start'] + $context['topics_per_page'] < $num_topics ? $scripturl . '?action=' . $_REQUEST['action'] . ($context['showing_all_topics'] ? ';all' : '') . sprintf($context['querystring_board_limits'], floor(($num_topics - 1) / $context['topics_per_page']) * $context['topics_per_page']) . $context['querystring_sort_limits'] : '',
            'up' => $scripturl,
        );
        $context['page_info'] = array(
            'current_page' => $_REQUEST['start'] / $context['topics_per_page'] + 1,
            'num_pages' => floor(($num_topics - 1) / $context['topics_per_page']) + 1
        );

        if ($num_topics == 0)
        {
            // Mark the boards as read if there are no unread topics!
            require_once($sourcedir . '/Subs-Boards.php');
            markBoardsRead(empty($boards) ? $board : $boards);

            $context['topics'] = array();
            $context['no_topic_listing'] = true;
            if ($context['querystring_board_limits'] == ';start=%1$d')
                $context['querystring_board_limits'] = '';
            else
                $context['querystring_board_limits'] = sprintf($context['querystring_board_limits'], $_REQUEST['start']);
            return;
        }
        else
            $min_message = (int) $min_message;

        $request = $smcFunc['db_query']('substring', '
            SELECT ' . $select_clause . '
            FROM {db_prefix}messages AS ms
                INNER JOIN {db_prefix}topics AS t ON (t.id_topic = ms.id_topic AND t.id_first_msg = ms.id_msg)
                INNER JOIN {db_prefix}messages AS ml ON (ml.id_msg = t.id_last_msg)
                LEFT JOIN {db_prefix}boards AS b ON (b.id_board = ms.id_board)
                LEFT JOIN {db_prefix}members AS mems ON (mems.id_member = ms.id_member)
                LEFT JOIN {db_prefix}members AS meml ON (meml.id_member = ml.id_member)' . (!empty($settings['avatars_on_indexes']) ? '
                LEFT JOIN {db_prefix}attachments AS af ON (af.id_member = mems.id_member)
                LEFT JOIN {db_prefix}attachments AS al ON (al.id_member = meml.id_member)' : '') . '
                LEFT JOIN {db_prefix}log_topics_unread AS lt ON (lt.id_topic = t.id_topic)
                LEFT JOIN {db_prefix}log_mark_read AS lmr ON (lmr.id_board = t.id_board AND lmr.id_member = {int:current_member})
            WHERE b.' . $query_this_board . '
                AND t.id_last_msg >= {int:min_message}
                AND COALESCE(lt.id_msg, lmr.id_msg, 0) < t.id_last_msg' . ($modSettings['postmod_active'] ? '
                AND ms.approved = {int:is_approved}' : '') . '
            ORDER BY {raw:sort}
            LIMIT {int:offset}, {int:limit}',
            array_merge($query_parameters, array(
                'current_member' => $user_info['id'],
                'min_message' => $min_message,
                'is_approved' => 1,
                'sort' => $_REQUEST['sort'] . ($ascending ? '' : ' DESC'),
                'offset' => $_REQUEST['start'],
                'limit' => $context['topics_per_page'],
            ))
        );
    }
    elseif ($is_topics)
    {
        $request = $smcFunc['db_query']('', '
            SELECT COUNT(*), MIN(t.id_last_msg)
            FROM {db_prefix}topics AS t' . (!empty($have_temp_table) ? '
                LEFT JOIN {db_prefix}log_topics_unread AS lt ON (lt.id_topic = t.id_topic)' : '
                LEFT JOIN {db_prefix}log_topics AS lt ON (lt.id_topic = t.id_topic AND lt.id_member = {int:current_member} AND lt.unwatched != 1)') . '
                LEFT JOIN {db_prefix}log_mark_read AS lmr ON (lmr.id_board = t.id_board AND lmr.id_member = {int:current_member})
            WHERE t.' . $query_this_board . ($context['showing_all_topics'] && !empty($earliest_msg) ? '
                AND t.id_last_msg > {int:earliest_msg}' : (!$context['showing_all_topics'] && empty($_SESSION['first_login']) ? '
                AND t.id_last_msg > {int:id_msg_last_visit}' : '')) . '
                AND COALESCE(lt.id_msg, lmr.id_msg, 0) < t.id_last_msg' . ($modSettings['postmod_active'] ? '
                AND t.approved = {int:is_approved}' : '') . '',
            array_merge($query_parameters, array(
                'current_member' => $user_info['id'],
                'earliest_msg' => !empty($earliest_msg) ? $earliest_msg : 0,
                'id_msg_last_visit' => $_SESSION['id_msg_last_visit'],
                'is_approved' => 1,
            ))
        );
        list ($num_topics, $min_message) = $smcFunc['db_fetch_row']($request);
        $smcFunc['db_free_result']($request);

        // Make sure the starting place makes sense and construct the page index.
        $context['page_index'] = constructPageIndex($scripturl . '?action=' . $_REQUEST['action'] . ($context['showing_all_topics'] ? ';all' : '') . $context['querystring_board_limits'] . $context['querystring_sort_limits'], $_REQUEST['start'], $num_topics, $context['topics_per_page'], true);
        $context['current_page'] = (int) $_REQUEST['start'] / $context['topics_per_page'];

        $context['links'] = array(
            'first' => $_REQUEST['start'] >= $context['topics_per_page'] ? $scripturl . '?action=' . $_REQUEST['action'] . ($context['showing_all_topics'] ? ';all' : '') . sprintf($context['querystring_board_limits'], 0) . $context['querystring_sort_limits'] : '',
            'prev' => $_REQUEST['start'] >= $context['topics_per_page'] ? $scripturl . '?action=' . $_REQUEST['action'] . ($context['showing_all_topics'] ? ';all' : '') . sprintf($context['querystring_board_limits'], $_REQUEST['start'] - $context['topics_per_page']) . $context['querystring_sort_limits'] : '',
            'next' => $_REQUEST['start'] + $context['topics_per_page'] < $num_topics ? $scripturl . '?action=' . $_REQUEST['action'] . ($context['showing_all_topics'] ? ';all' : '') . sprintf($context['querystring_board_limits'], $_REQUEST['start'] + $context['topics_per_page']) . $context['querystring_sort_limits'] : '',
            'last' => $_REQUEST['start'] + $context['topics_per_page'] < $num_topics ? $scripturl . '?action=' . $_REQUEST['action'] . ($context['showing_all_topics'] ? ';all' : '') . sprintf($context['querystring_board_limits'], floor(($num_topics - 1) / $context['topics_per_page']) * $context['topics_per_page']) . $context['querystring_sort_limits'] : '',
            'up' => $scripturl,
        );
        $context['page_info'] = array(
            'current_page' => $_REQUEST['start'] / $context['topics_per_page'] + 1,
            'num_pages' => floor(($num_topics - 1) / $context['topics_per_page']) + 1
        );

        if ($num_topics == 0)
        {
            // Is this an all topics query?
            if ($context['showing_all_topics'])
            {
                // Since there are no unread topics, mark the boards as read!
                require_once($sourcedir . '/Subs-Boards.php');
                markBoardsRead(empty($boards) ? $board : $boards);
            }

            $context['topics'] = array();
            $context['no_topic_listing'] = true;
            if ($context['querystring_board_limits'] == ';start=%d')
                $context['querystring_board_limits'] = '';
            else
                $context['querystring_board_limits'] = sprintf($context['querystring_board_limits'], $_REQUEST['start']);
            return;
        }
        else
            $min_message = (int) $min_message;

        $request = $smcFunc['db_query']('substring', '
            SELECT ' . $select_clause . '
            FROM {db_prefix}messages AS ms
                INNER JOIN {db_prefix}topics AS t ON (t.id_topic = ms.id_topic AND t.id_first_msg = ms.id_msg)
                INNER JOIN {db_prefix}messages AS ml ON (ml.id_msg = t.id_last_msg)
                LEFT JOIN {db_prefix}boards AS b ON (b.id_board = t.id_board)
                LEFT JOIN {db_prefix}members AS mems ON (mems.id_member = ms.id_member)
                LEFT JOIN {db_prefix}members AS meml ON (meml.id_member = ml.id_member)' . (!empty($settings['avatars_on_indexes']) ? '
                LEFT JOIN {db_prefix}attachments AS af ON (af.id_member = mems.id_member)
                LEFT JOIN {db_prefix}attachments AS al ON (al.id_member = meml.id_member)' : '') . '' . (!empty($have_temp_table) ? '
                LEFT JOIN {db_prefix}log_topics_unread AS lt ON (lt.id_topic = t.id_topic)' : '
                LEFT JOIN {db_prefix}log_topics AS lt ON (lt.id_topic = t.id_topic AND lt.id_member = {int:current_member} AND lt.unwatched != 1)') . '
                LEFT JOIN {db_prefix}log_mark_read AS lmr ON (lmr.id_board = t.id_board AND lmr.id_member = {int:current_member})
            WHERE t.' . $query_this_board . '
                AND t.id_last_msg >= {int:min_message}
                AND COALESCE(lt.id_msg, lmr.id_msg, 0) < ml.id_msg' . ($modSettings['postmod_active'] ? '
                AND ms.approved = {int:is_approved}' : '') . '
            ORDER BY {raw:order}
            LIMIT {int:offset}, {int:limit}',
            array_merge($query_parameters, array(
                'current_member' => $user_info['id'],
                'min_message' => $min_message,
                'is_approved' => 1,
                'order' => $_REQUEST['sort'] . ($ascending ? '' : ' DESC'),
                'offset' => $_REQUEST['start'],
                'limit' => $context['topics_per_page'],
            ))
        );
    }
    else
    {
        if ($modSettings['totalMessages'] > 100000)
        {
            $smcFunc['db_query']('', '
                DROP TABLE IF EXISTS {db_prefix}topics_posted_in',
                array(
                )
            );

            $smcFunc['db_query']('', '
                DROP TABLE IF EXISTS {db_prefix}log_topics_posted_in',
                array(
                )
            );

            $sortKey_joins = array(
                'ms.subject' => '
                    INNER JOIN {db_prefix}messages AS ms ON (ms.id_msg = t.id_first_msg)',
                'COALESCE(mems.real_name, ms.poster_name)' => '
                    INNER JOIN {db_prefix}messages AS ms ON (ms.id_msg = t.id_first_msg)
                    LEFT JOIN {db_prefix}members AS mems ON (mems.id_member = ms.id_member)',
            );

            // The main benefit of this temporary table is not that it's faster; it's that it avoids locks later.
            $have_temp_table = $smcFunc['db_query']('', '
                CREATE TEMPORARY TABLE {db_prefix}topics_posted_in (
                    id_topic mediumint(8) unsigned NOT NULL default {string:string_zero},
                    id_board smallint(5) unsigned NOT NULL default {string:string_zero},
                    id_last_msg int(10) unsigned NOT NULL default {string:string_zero},
                    id_msg int(10) unsigned NOT NULL default {string:string_zero},
                    PRIMARY KEY (id_topic)
                )
                SELECT t.id_topic, t.id_board, t.id_last_msg, COALESCE(lmr.id_msg, 0) AS id_msg' . (!in_array($_REQUEST['sort'], array('t.id_last_msg', 't.id_topic')) ? ', ' . $_REQUEST['sort'] . ' AS sort_key' : '') . '
                FROM {db_prefix}messages AS m
                    INNER JOIN {db_prefix}topics AS t ON (t.id_topic = m.id_topic)
                    LEFT JOIN {db_prefix}log_topics_unread AS lt ON (lt.id_topic = t.id_topic)
                    LEFT JOIN {db_prefix}log_mark_read AS lmr ON (lmr.id_board = t.id_board AND lmr.id_member = {int:current_member})' . (isset($sortKey_joins[$_REQUEST['sort']]) ? $sortKey_joins[$_REQUEST['sort']] : '') . '
                WHERE m.id_member = {int:current_member}' . (!empty($board) ? '
                    AND t.id_board = {int:current_board}' : '') . ($modSettings['postmod_active'] ? '
                    AND t.approved = {int:is_approved}' : '') . '
                GROUP BY m.id_topic',
                array(
                    'current_board' => $board,
                    'current_member' => $user_info['id'],
                    'is_approved' => 1,
                    'string_zero' => '0',
                    'db_error_skip' => true,
                )
            ) !== false;

            // If that worked, create a sample of the log_topics table too.
            if ($have_temp_table)
                $have_temp_table = $smcFunc['db_query']('', '
                    CREATE TEMPORARY TABLE {db_prefix}log_topics_posted_in (
                        PRIMARY KEY (id_topic)
                    )
                    SELECT lt.id_topic, lt.id_msg
                    FROM {db_prefix}log_topics AS lt
                        INNER JOIN {db_prefix}topics_posted_in AS pi ON (pi.id_topic = lt.id_topic)
                    WHERE lt.id_member = {int:current_member}',
                    array(
                        'current_member' => $user_info['id'],
                        'db_error_skip' => true,
                    )
                ) !== false;
        }

        if (!empty($have_temp_table))
        {
            $request = $smcFunc['db_query']('', '
                SELECT COUNT(*)
                FROM {db_prefix}topics_posted_in AS pi
                    LEFT JOIN {db_prefix}log_topics_posted_in AS lt ON (lt.id_topic = pi.id_topic)
                WHERE pi.' . $query_this_board . '
                    AND COALESCE(lt.id_msg, pi.id_msg) < pi.id_last_msg',
                array_merge($query_parameters, array(
                ))
            );
            list ($num_topics) = $smcFunc['db_fetch_row']($request);
            $smcFunc['db_free_result']($request);
        }
        else
        {
            $request = $smcFunc['db_query']('unread_fetch_topic_count', '
                SELECT COUNT(DISTINCT t.id_topic), MIN(t.id_last_msg)
                FROM {db_prefix}topics AS t
                    INNER JOIN {db_prefix}messages AS m ON (m.id_topic = t.id_topic)
                    LEFT JOIN {db_prefix}log_topics AS lt ON (lt.id_topic = t.id_topic AND lt.id_member = {int:current_member})
                    LEFT JOIN {db_prefix}log_mark_read AS lmr ON (lmr.id_board = t.id_board AND lmr.id_member = {int:current_member})
                WHERE t.' . $query_this_board . '
                    AND m.id_member = {int:current_member}
                    AND COALESCE(lt.id_msg, lmr.id_msg, 0) < t.id_last_msg' . ($modSettings['postmod_active'] ? '
                    AND t.approved = {int:is_approved}' : '') . ' AND lt.unwatched != 1',
                array_merge($query_parameters, array(
                    'current_member' => $user_info['id'],
                    'is_approved' => 1,
                ))
            );
            list ($num_topics, $min_message) = $smcFunc['db_fetch_row']($request);
            $smcFunc['db_free_result']($request);
        }

        // Make sure the starting place makes sense and construct the page index.
        $context['page_index'] = constructPageIndex($scripturl . '?action=' . $_REQUEST['action'] . $context['querystring_board_limits'] . $context['querystring_sort_limits'], $_REQUEST['start'], $num_topics, $context['topics_per_page'], true);
        $context['current_page'] = (int) $_REQUEST['start'] / $context['topics_per_page'];

        $context['links'] = array(
            'first' => $_REQUEST['start'] >= $context['topics_per_page'] ? $scripturl . '?action=' . $_REQUEST['action'] . ($context['showing_all_topics'] ? ';all' : '') . sprintf($context['querystring_board_limits'], 0) . $context['querystring_sort_limits'] : '',
            'prev' => $_REQUEST['start'] >= $context['topics_per_page'] ? $scripturl . '?action=' . $_REQUEST['action'] . ($context['showing_all_topics'] ? ';all' : '') . sprintf($context['querystring_board_limits'], $_REQUEST['start'] - $context['topics_per_page']) . $context['querystring_sort_limits'] : '',
            'next' => $_REQUEST['start'] + $context['topics_per_page'] < $num_topics ? $scripturl . '?action=' . $_REQUEST['action'] . ($context['showing_all_topics'] ? ';all' : '') . sprintf($context['querystring_board_limits'], $_REQUEST['start'] + $context['topics_per_page']) . $context['querystring_sort_limits'] : '',
            'last' => $_REQUEST['start'] + $context['topics_per_page'] < $num_topics ? $scripturl . '?action=' . $_REQUEST['action'] . ($context['showing_all_topics'] ? ';all' : '') . sprintf($context['querystring_board_limits'], floor(($num_topics - 1) / $context['topics_per_page']) * $context['topics_per_page']) . $context['querystring_sort_limits'] : '',
            'up' => $scripturl,
        );
        $context['page_info'] = array(
            'current_page' => $_REQUEST['start'] / $context['topics_per_page'] + 1,
            'num_pages' => floor(($num_topics - 1) / $context['topics_per_page']) + 1
        );

        if ($num_topics == 0)
        {
            $context['topics'] = array();
            $context['no_topic_listing'] = true;
            if ($context['querystring_board_limits'] == ';start=%d')
                $context['querystring_board_limits'] = '';
            else
                $context['querystring_board_limits'] = sprintf($context['querystring_board_limits'], $_REQUEST['start']);
            return;
        }

        if (!empty($have_temp_table))
            $request = $smcFunc['db_query']('', '
                SELECT t.id_topic
                FROM {db_prefix}topics_posted_in AS t
                    LEFT JOIN {db_prefix}log_topics_posted_in AS lt ON (lt.id_topic = t.id_topic)
                WHERE t.' . $query_this_board . '
                    AND COALESCE(lt.id_msg, t.id_msg) < t.id_last_msg
                ORDER BY {raw:order}
                LIMIT {int:offset}, {int:limit}',
                array_merge($query_parameters, array(
                    'order' => (in_array($_REQUEST['sort'], array('t.id_last_msg', 't.id_topic')) ? $_REQUEST['sort'] : 't.sort_key') . ($ascending ? '' : ' DESC'),
                    'offset' => $_REQUEST['start'],
                    'limit' => $context['topics_per_page'],
                ))
            );
        else
            $request = $smcFunc['db_query']('', '
                SELECT DISTINCT t.id_topic,' . $_REQUEST['sort'] . '
                FROM {db_prefix}topics AS t
                    INNER JOIN {db_prefix}messages AS m ON (m.id_topic = t.id_topic AND m.id_member = {int:current_member})' . (strpos($_REQUEST['sort'], 'ms.') === false ? '' : '
                    INNER JOIN {db_prefix}messages AS ms ON (ms.id_msg = t.id_first_msg)') . (strpos($_REQUEST['sort'], 'mems.') === false ? '' : '
                    LEFT JOIN {db_prefix}members AS mems ON (mems.id_member = ms.id_member)') . '
                    LEFT JOIN {db_prefix}log_topics AS lt ON (lt.id_topic = t.id_topic AND lt.id_member = {int:current_member})
                    LEFT JOIN {db_prefix}log_mark_read AS lmr ON (lmr.id_board = t.id_board AND lmr.id_member = {int:current_member})
                WHERE t.' . $query_this_board . '
                    AND t.id_last_msg >= {int:min_message}
                    AND (COALESCE(lt.id_msg, lmr.id_msg, 0)) < t.id_last_msg
                    AND t.approved = {int:is_approved} AND lt.unwatched != 1
                ORDER BY {raw:order}
                LIMIT {int:offset}, {int:limit}',
                array_merge($query_parameters, array(
                    'current_member' => $user_info['id'],
                    'min_message' => (int) $min_message,
                    'is_approved' => 1,
                    'order' => $_REQUEST['sort'] . ($ascending ? '' : ' DESC'),
                    'offset' => $_REQUEST['start'],
                    'limit' => $context['topics_per_page'],
                    'sort' => $_REQUEST['sort'],
                ))
            );

        $topics = array();
        while ($row = $smcFunc['db_fetch_assoc']($request))
            $topics[] = $row['id_topic'];
        $smcFunc['db_free_result']($request);

        // Sanity... where have you gone?
        if (empty($topics))
        {
            $context['topics'] = array();
            $context['no_topic_listing'] = true;
            if ($context['querystring_board_limits'] == ';start=%d')
                $context['querystring_board_limits'] = '';
            else
                $context['querystring_board_limits'] = sprintf($context['querystring_board_limits'], $_REQUEST['start']);
            return;
        }

        $request = $smcFunc['db_query']('substring', '
            SELECT ' . $select_clause . '
            FROM {db_prefix}topics AS t
                INNER JOIN {db_prefix}messages AS ms ON (ms.id_topic = t.id_topic AND ms.id_msg = t.id_first_msg)
                INNER JOIN {db_prefix}messages AS ml ON (ml.id_msg = t.id_last_msg)
                INNER JOIN {db_prefix}boards AS b ON (b.id_board = t.id_board)
                LEFT JOIN {db_prefix}members AS mems ON (mems.id_member = ms.id_member)
                LEFT JOIN {db_prefix}members AS meml ON (meml.id_member = ml.id_member)' . (!empty($settings['avatars_on_indexes']) ? '
                LEFT JOIN {db_prefix}attachments AS af ON (af.id_member = mems.id_member)
                LEFT JOIN {db_prefix}attachments AS al ON (al.id_member = meml.id_member)' : '') . '
                LEFT JOIN {db_prefix}log_topics AS lt ON (lt.id_topic = t.id_topic AND lt.id_member = {int:current_member})
                LEFT JOIN {db_prefix}log_mark_read AS lmr ON (lmr.id_board = t.id_board AND lmr.id_member = {int:current_member})
            WHERE t.id_topic IN ({array_int:topic_list})
            ORDER BY {raw:sort}' . ($ascending ? '' : ' DESC') . '
            LIMIT {int:limit}',
            array(
                'current_member' => $user_info['id'],
                'topic_list' => $topics,
                'sort' => $_REQUEST['sort'],
                'limit' => count($topics),
            )
        );
    }

    $context['topics'] = array();
    $topic_ids = array();
    $recycle_board = !empty($modSettings['recycle_enable']) && !empty($modSettings['recycle_board']) ? $modSettings['recycle_board'] : 0;

    while ($row = $smcFunc['db_fetch_assoc']($request))
    {
        if ($row['id_poll'] > 0 && $modSettings['pollMode'] == '0')
            continue;

        $topic_ids[] = $row['id_topic'];

        if (!empty($modSettings['preview_characters']))
        {
            // Limit them to 128 characters - do this FIRST because it's a lot of wasted censoring otherwise.
            $row['first_body'] = strip_tags(strtr(parse_bbc($row['first_body'], $row['first_smileys'], $row['id_first_msg']), array('<br>' => '&#10;')));
            if ($smcFunc['strlen']($row['first_body']) > 128)
                $row['first_body'] = $smcFunc['substr']($row['first_body'], 0, 128) . '...';
            $row['last_body'] = strip_tags(strtr(parse_bbc($row['last_body'], $row['last_smileys'], $row['id_last_msg']), array('<br>' => '&#10;')));
            if ($smcFunc['strlen']($row['last_body']) > 128)
                $row['last_body'] = $smcFunc['substr']($row['last_body'], 0, 128) . '...';

            // 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.
        $topic_length = $row['num_replies'] + 1;
        $messages_per_page = empty($modSettings['disableCustomPerPage']) && !empty($options['messages_per_page']) ? $options['messages_per_page'] : $modSettings['defaultMaxMessages'];
        if ($topic_length > $messages_per_page)
        {
            $start = -1;
            $pages = constructPageIndex($scripturl . '?topic=' . $row['id_topic'] . '.%1$d', $start, $topic_length, $messages_per_page, true, false);

            // If we can use all, show all.
            if (!empty($modSettings['enableAllMessages']) && $topic_length < $modSettings['enableAllMessages'])
                $pages .= ' &nbsp;<a href="' . $scripturl . '?topic=' . $row['id_topic'] . '.0;all">' . $txt['all'] . '</a>';
        }

        else
            $pages = '';

        // We need to check the topic icons exist... you can never be too sure!
        if (!empty($modSettings['messageIconChecks_enable']))
        {
            // First icon first... as you'd expect.
            if (!isset($context['icon_sources'][$row['first_icon']]))
                $context['icon_sources'][$row['first_icon']] = file_exists($settings['theme_dir'] . '/images/post/' . $row['first_icon'] . '.png') ? 'images_url' : 'default_images_url';
            // Last icon... last... duh.
            if (!isset($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';
        }

        // Force the recycling icon if appropriate
        if ($recycle_board == $row['id_board'])
        {
            $row['first_icon'] = 'recycled';
            $row['last_icon'] = 'recycled';
        }

        // Reference the main color class.
        $colorClass = 'windowbg';

        // Sticky topics should get a different color, too.
        if ($row['is_sticky'])
            $colorClass .= ' sticky';

        // Locked topics get special treatment as well.
        if ($row['locked'])
            $colorClass .= ' locked';

        // And build the array.
        $context['topics'][$row['id_topic']] = array(
            'id' => $row['id_topic'],
            'first_post' => array(
                'id' => $row['id_first_msg'],
                'member' => array(
                    'name' => $row['first_poster_name'],
                    'id' => $row['id_first_member'],
                    'href' => $scripturl . '?action=profile;u=' . $row['id_first_member'],
                    'link' => !empty($row['id_first_member']) ? '<a class="preview" href="' . $scripturl . '?action=profile;u=' . $row['id_first_member'] . '" title="' . $txt['profile_of'] . ' ' . $row['first_poster_name'] . '">' . $row['first_poster_name'] . '</a>' : $row['first_poster_name']
                ),
                'time' => timeformat($row['first_poster_time']),
                'timestamp' => forum_time(true, $row['first_poster_time']),
                'subject' => $row['first_subject'],
                'preview' => $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;topicseen',
                'link' => '<a href="' . $scripturl . '?topic=' . $row['id_topic'] . '.0;topicseen">' . $row['first_subject'] . '</a>'
            ),
            'last_post' => array(
                'id' => $row['id_last_msg'],
                'member' => array(
                    'name' => $row['last_poster_name'],
                    'id' => $row['id_last_member'],
                    'href' => $scripturl . '?action=profile;u=' . $row['id_last_member'],
                    'link' => !empty($row['id_last_member']) ? '<a href="' . $scripturl . '?action=profile;u=' . $row['id_last_member'] . '">' . $row['last_poster_name'] . '</a>' : $row['last_poster_name']
                ),
                'time' => timeformat($row['last_poster_time']),
                'timestamp' => forum_time(true, $row['last_poster_time']),
                'subject' => $row['last_subject'],
                'preview' => $row['last_body'],
                'icon' => $row['last_icon'],
                'icon_url' => $settings[$context['icon_sources'][$row['last_icon']]] . '/post/' . $row['last_icon'] . '.png',
                'href' => $scripturl . '?topic=' . $row['id_topic'] . ($row['num_replies'] == 0 ? '.0' : '.msg' . $row['id_last_msg']) . ';topicseen#msg' . $row['id_last_msg'],
                'link' => '<a href="' . $scripturl . '?topic=' . $row['id_topic'] . ($row['num_replies'] == 0 ? '.0' : '.msg' . $row['id_last_msg']) . ';topicseen#msg' . $row['id_last_msg'] . '" rel="nofollow">' . $row['last_subject'] . '</a>'
            ),
            'new_from' => $row['new_from'],
            'new_href' => $scripturl . '?topic=' . $row['id_topic'] . '.msg' . $row['new_from'] . ';topicseen#new',
            'href' => $scripturl . '?topic=' . $row['id_topic'] . ($row['num_replies'] == 0 ? '.0' : '.msg' . $row['new_from']) . ';topicseen' . ($row['num_replies'] == 0 ? '' : 'new'),
            'link' => '<a href="' . $scripturl . '?topic=' . $row['id_topic'] . ($row['num_replies'] == 0 ? '.0' : '.msg' . $row['new_from']) . ';topicseen#msg' . $row['new_from'] . '" rel="nofollow">' . $row['first_subject'] . '</a>',
            'is_sticky' => !empty($row['is_sticky']),
            'is_locked' => !empty($row['locked']),
            'css_class' => $colorClass,
            'is_poll' => $modSettings['pollMode'] == '1' && $row['id_poll'] > 0,
            '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'],
            'pages' => $pages,
            'replies' => comma_format($row['num_replies']),
            'views' => comma_format($row['num_views']),
            'board' => array(
                'id' => $row['id_board'],
                'name' => $row['bname'],
                'href' => $scripturl . '?board=' . $row['id_board'] . '.0',
                'link' => '<a href="' . $scripturl . '?board=' . $row['id_board'] . '.0">' . $row['bname'] . '</a>'
            )
        );
        if (!empty($settings['avatars_on_indexes']))
        {
            $context['topics'][$row['id_topic']]['last_post']['member']['avatar'] = set_avatar_data(array(
                'avatar' => $row['avatar'],
                'email' => $row['email_address'],
                'filename' => $row['last_poster_filename'],
            ));

            $context['topics'][$row['id_topic']]['first_post']['member']['avatar'] = set_avatar_data(array(
                'avatar' => $row['first_poster_avatar'],
                'email' => $row['first_poster_email'],
                'filename' => $row['first_poster_filename'],
            ));
        }

        $context['topics'][$row['id_topic']]['first_post']['started_by'] = sprintf($txt['topic_started_by'], $context['topics'][$row['id_topic']]['first_post']['member']['link'], $context['topics'][$row['id_topic']]['board']['link']);
    }
    $smcFunc['db_free_result']($request);

    if ($is_topics && !empty($modSettings['enableParticipation']) && !empty($topic_ids))
    {
        $result = $smcFunc['db_query']('', '
            SELECT id_topic
            FROM {db_prefix}messages
            WHERE id_topic IN ({array_int:topic_list})
                AND id_member = {int:current_member}
            GROUP BY id_topic
            LIMIT {int:limit}',
            array(
                'current_member' => $user_info['id'],
                'topic_list' => $topic_ids,
                'limit' => count($topic_ids),
            )
        );
        while ($row = $smcFunc['db_fetch_assoc']($result))
        {
            if (empty($context['topics'][$row['id_topic']]['is_posted_in']))
                $context['topics'][$row['id_topic']]['is_posted_in'] = true;
        }
        $smcFunc['db_free_result']($result);
    }

    $context['querystring_board_limits'] = sprintf($context['querystring_board_limits'], $_REQUEST['start']);
    $context['topics_to_mark'] = implode('-', $topic_ids);

    // Build the recent button array.
    if ($is_topics)
    {
        $context['recent_buttons'] = array(
            'markread' => array('text' => !empty($context['no_board_limits']) ? 'mark_as_read' : 'mark_read_short', 'image' => 'markread.png', 'custom' => 'data-confirm="' . $txt['are_sure_mark_read'] . '"', 'class' => 'you_sure', 'url' => $scripturl . '?action=markasread;sa=' . (!empty($context['no_board_limits']) ? 'all' : 'board' . $context['querystring_board_limits']) . ';' . $context['session_var'] . '=' . $context['session_id']),
        );

        if ($context['showCheckboxes'])
            $context['recent_buttons']['markselectread'] = array(
                'text' => 'quick_mod_markread',
                'image' => 'markselectedread.png',
                'url' => 'javascript:document.quickModForm.submit();',
            );

        if (!empty($context['topics']) && !$context['showing_all_topics'])
            $context['recent_buttons']['readall'] = array('text' => 'unread_topics_all', 'image' => 'markreadall.png', 'url' => $scripturl . '?action=unread;all' . $context['querystring_board_limits'], 'active' => true);
    }
    elseif (!$is_topics && isset($context['topics_to_mark']))
    {
        $context['recent_buttons'] = array(
            'markread' => array('text' => 'mark_as_read', 'image' => 'markread.png', 'custom' => 'data-confirm="' . $txt['are_sure_mark_read'] . '"', 'class' => 'you_sure', 'url' => $scripturl . '?action=markasread;sa=unreadreplies;topics=' . $context['topics_to_mark'] . ';' . $context['session_var'] . '=' . $context['session_id']),
        );

        if ($context['showCheckboxes'])
            $context['recent_buttons']['markselectread'] = array(
                'text' => 'quick_mod_markread',
                'image' => 'markselectedread.png',
                'url' => 'javascript:document.quickModForm.submit();',
            );
    }

    // Allow mods to add additional buttons here
    call_integration_hook('integrate_recent_buttons');

    $context['no_topic_listing'] = empty($context['topics']);

    // Allow helpdesks and bug trackers and what not to add their own unread data (just add a template_layer to show custom stuff in the template!)
    call_integration_hook('integrate_unread_list');
}

?>