<?
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($DB->record_count()) {
	list($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++) {
		$Cache->delete('thread_'.$ThreadID.'_catalogue_'.$i);
	}
}

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