<?
// perform the back end of subscribing to collages
authorize();

if (!is_number($_GET['collageid'])) {
	error(0);
}

$CollageID = (int) $_GET['collageid'];

if (!$UserSubscriptions = $Cache->get_value('collage_subs_user_'.$LoggedUser['ID'])) {
	$DB->query('SELECT CollageID FROM users_collage_subs WHERE UserID = '.db_string($LoggedUser['ID']));
	$UserSubscriptions = $DB->collect(0);
	$Cache->cache_value('collage_subs_user_'.$LoggedUser['ID'],$UserSubscriptions,0);
}

if (($Key = array_search($CollageID, $UserSubscriptions)) !== false) {
	$DB->query('DELETE FROM users_collage_subs WHERE UserID = '.db_string($LoggedUser['ID']).' AND CollageID = '.$CollageID);
	unset($UserSubscriptions[$Key]);
	Collages::decrease_subscriptions($CollageID);
} else {
	$DB->query("INSERT IGNORE INTO users_collage_subs (UserID, CollageID, LastVisit) VALUES ($LoggedUser[ID], ".$CollageID.", NOW())");
	array_push($UserSubscriptions, $CollageID);
	Collages::increase_subscriptions($CollageID);
}
$Cache->replace_value('collage_subs_user_'.$LoggedUser['ID'], $UserSubscriptions, 0);
$Cache->delete_value('collage_subs_user_new_'.$LoggedUser['ID']);
$Cache->delete_value('collage_'.$CollageID);