<?
enforce_login();
authorize();
if (!check_perms('site_moderate_forums')) {
	error(403);
}

$ThreadID = $_GET['threadid'];
$PostID = $_GET['postid'];
$Delete = !empty($_GET['remove']);

if (!$ThreadID || !$PostID || !is_number($ThreadID) || !is_number($PostID)) {
	error(404);
}

$DB->query("
	SELECT
		CEIL(COUNT(ID)/".POSTS_PER_PAGE.") AS Pages,
		CEIL(SUM(IF(ID<=$PostID,1,0))/".POSTS_PER_PAGE.") AS Page
	FROM forums_posts
	WHERE TopicID=$ThreadID
	GROUP BY TopicID");

if ($DB->has_results()) {
	list($Pages,$Page) = $DB->next_record();
	if ($Delete) {
		$DB->query("
			UPDATE forums_topics
			SET StickyPostID = 0
			WHERE ID = $ThreadID");
	} else {
		$DB->query("
			UPDATE forums_topics
			SET StickyPostID = $PostID
			WHERE ID = $ThreadID");
	}
	$Cache->delete_value('thread_'.$ThreadID.'_info');
	$ThisCatalogue = floor((POSTS_PER_PAGE * $Page - POSTS_PER_PAGE) / THREAD_CATALOGUE);
	$LastCatalogue = floor((POSTS_PER_PAGE * $Pages - POSTS_PER_PAGE) / THREAD_CATALOGUE);
	for ($i = $ThisCatalogue; $i <= $LastCatalogue; $i++) {
		$Cache->delete_value('thread_'.$ThreadID.'_catalogue_'.$i);
	}
}

header('Location: forums.php?action=viewthread&threadid='.$ThreadID);