<?php

authorize();

if (($_GET['forumid'] ?? '') == 'all') {
    $Viewer->updateCatchup();
    header('Location: forums.php');
    exit;
}

$forum = (new Gazelle\Manager\Forum)->findById((int)($_GET['forumid'] ?? 0));
if (is_null($forum)) {
    error(404);
}

$forum->userCatchup($Viewer->id());
header('Location: ' . $forum->location());