/**
 * Given a course and a date, prints a summary of all the new
 * messages posted in the course since that date
 *
 * @global object
 * @global object
 * @global object
 * @uses CONTEXT_MODULE
 * @uses VISIBLEGROUPS
 * @param object $course
 * @param bool $viewfullnames capability
 * @param int $timestart
 * @return bool success
 */
function forum_print_recent_activity($course, $viewfullnames, $timestart)
{
    global $CFG, $USER, $DB, $OUTPUT;
    // do not use log table if possible, it may be huge and is expensive to join with other tables
    $allnamefields = user_picture::fields('u', null, 'duserid');
    if (!($posts = $DB->get_records_sql("SELECT p.*, f.type AS forumtype, d.forum, d.groupid,\n                                              d.timestart, d.timeend, {$allnamefields}\n                                         FROM {forum_posts} p\n                                              JOIN {forum_discussions} d ON d.id = p.discussion\n                                              JOIN {forum} f             ON f.id = d.forum\n                                              JOIN {user} u              ON u.id = p.userid\n                                        WHERE p.created > ? AND f.course = ?\n                                     ORDER BY p.id ASC", array($timestart, $course->id)))) {
        // order by initial posting date
        return false;
    }
    $modinfo = get_fast_modinfo($course);
    $groupmodes = array();
    $cms = array();
    $strftimerecent = get_string('strftimerecent');
    $printposts = array();
    foreach ($posts as $post) {
        if (!isset($modinfo->instances['forum'][$post->forum])) {
            // not visible
            continue;
        }
        $cm = $modinfo->instances['forum'][$post->forum];
        if (!$cm->uservisible) {
            continue;
        }
        $context = context_module::instance($cm->id);
        if (!has_capability('mod/forum:viewdiscussion', $context)) {
            continue;
        }
        if (!empty($CFG->forum_enabletimedposts) and $USER->id != $post->duserid and ($post->timestart > 0 and $post->timestart > time() or $post->timeend > 0 and $post->timeend < time())) {
            if (!has_capability('mod/forum:viewhiddentimedposts', $context)) {
                continue;
            }
        }
        // Check that the user can see the discussion.
        if (forum_is_user_group_discussion($cm, $post->groupid)) {
            $printposts[] = $post;
        }
    }
    unset($posts);
    if (!$printposts) {
        return false;
    }
    echo $OUTPUT->heading(get_string('newforumposts', 'forum') . ':', 3);
    echo "\n<ul class='unlist'>\n";
    foreach ($printposts as $post) {
        $subjectclass = empty($post->parent) ? ' bold' : '';
        echo '<li><div class="head">' . '<div class="date">' . userdate($post->modified, $strftimerecent) . '</div>' . '<div class="name">' . fullname($post, $viewfullnames) . '</div>' . '</div>';
        echo '<div class="info' . $subjectclass . '">';
        if (empty($post->parent)) {
            echo '"<a href="' . $CFG->wwwroot . '/mod/forum/discuss.php?d=' . $post->discussion . '">';
        } else {
            echo '"<a href="' . $CFG->wwwroot . '/mod/forum/discuss.php?d=' . $post->discussion . '&amp;parent=' . $post->parent . '#p' . $post->id . '">';
        }
        $post->subject = break_up_long_words(format_string($post->subject, true));
        echo $post->subject;
        echo "</a>\"</div></li>\n";
    }
    echo "</ul>\n";
    return true;
}

/**
 * Given a course and a date, prints a summary of all the new
 * messages posted in the course since that date
 *
 * @global object
 * @global object
 * @global object
 * @uses CONTEXT_MODULE
 * @uses VISIBLEGROUPS
 * @param object $course
 * @param bool $viewfullnames capability
 * @param int $timestart
 * @return bool success
 */
function forum_print_recent_activity($course, $viewfullnames, $timestart)
{
    global $CFG, $USER, $DB, $OUTPUT;
    // do not use log table if possible, it may be huge and is expensive to join with other tables
    $allnamefields = user_picture::fields('u', null, 'duserid');
    if (!($posts = $DB->get_records_sql("SELECT p.*, f.type AS forumtype, d.forum, d.groupid,\n                                              d.timestart, d.timeend, {$allnamefields}\n                                         FROM {forum_posts} p\n                                              JOIN {forum_discussions} d ON d.id = p.discussion\n                                              JOIN {forum} f             ON f.id = d.forum\n                                              JOIN {user} u              ON u.id = p.userid\n                                        WHERE p.created > ? AND f.course = ?\n                                     ORDER BY p.id ASC", array($timestart, $course->id)))) {
        // order by initial posting date
        return false;
    }
    $modinfo = get_fast_modinfo($course);
    $groupmodes = array();
    $cms = array();
    $strftimerecent = get_string('strftimerecent');
    $printposts = array();
    foreach ($posts as $post) {
        if (!isset($modinfo->instances['forum'][$post->forum])) {
            // not visible
            continue;
        }
        $cm = $modinfo->instances['forum'][$post->forum];
        if (!$cm->uservisible) {
            continue;
        }
        $context = context_module::instance($cm->id);
        if (!has_capability('mod/forum:viewdiscussion', $context)) {
            continue;
        }
        if (!empty($CFG->forum_enabletimedposts) and $USER->id != $post->duserid and ($post->timestart > 0 and $post->timestart > time() or $post->timeend > 0 and $post->timeend < time())) {
            if (!has_capability('mod/forum:viewhiddentimedposts', $context)) {
                continue;
            }
        }
        // Check that the user can see the discussion.
        if (forum_is_user_group_discussion($cm, $post->groupid)) {
            $printposts[] = $post;
        }
    }
    unset($posts);
    if (!$printposts) {
        return false;
    }
    echo $OUTPUT->heading(get_string('newforumposts', 'forum') . ':', 3);
    $list = html_writer::start_tag('ul', ['class' => 'unlist']);
    foreach ($printposts as $post) {
        $subjectclass = empty($post->parent) ? ' bold' : '';
        $authorhidden = forum_is_author_hidden($post, (object) ['type' => $post->forumtype]);
        $list .= html_writer::start_tag('li');
        $list .= html_writer::start_div('head');
        $list .= html_writer::div(userdate($post->modified, $strftimerecent), 'date');
        if (!$authorhidden) {
            $list .= html_writer::div(fullname($post, $viewfullnames), 'name');
        }
        $list .= html_writer::end_div();
        // Head.
        $list .= html_writer::start_div('info' . $subjectclass);
        $discussionurl = new moodle_url('/mod/forum/discuss.php', ['d' => $post->discussion]);
        if (!empty($post->parent)) {
            $discussionurl->param('parent', $post->parent);
            $discussionurl->set_anchor('p' . $post->id);
        }
        $post->subject = break_up_long_words(format_string($post->subject, true));
        $list .= html_writer::link($discussionurl, $post->subject);
        $list .= html_writer::end_div();
        // Info.
        $list .= html_writer::end_tag('li');
    }
    $list .= html_writer::end_tag('ul');
    echo $list;
    return true;
}