<?php

	authorize();

	$CollageID = $_POST['collageid'];
	if(!is_number($CollageID)) { error(404); }

	$DB->query("SELECT UserID, CategoryID FROM collages WHERE ID='$CollageID'");
	list($UserID, $CategoryID) = $DB->next_record();
	if($CategoryID == 0 && $UserID!=$LoggedUser['ID'] && !check_perms('site_collages_delete')) { error(403); }

	$GroupID = $_POST['groupid'];
	if(!is_number($GroupID)) { error(404); }

	if($_POST['submit'] == 'Remove') {
		$DB->query("DELETE FROM collages_torrents WHERE CollageID='$CollageID' AND GroupID='$GroupID'");
		$Rows = $DB->affected_rows();
		$DB->query("UPDATE collages SET NumTorrents=NumTorrents-$Rows WHERE ID='$CollageID'");
		$Cache->delete_value('torrents_details_'.$GroupID);
		$Cache->delete_value('torrent_collages_'.$GroupID);
		$Cache->delete_value('torrent_collages_personal_'.$GroupID);
	} elseif(isset($_POST['drag_drop_collage_sort_order'])) {

		@parse_str($_POST['drag_drop_collage_sort_order'], $Series);
		$Series = @array_shift($Series);
		if(is_array($Series)){
			$SQL = array();
			foreach($Series as $Sort => $GroupID){
				if(is_number($Sort) && is_number($GroupID)){
					$Sort = ($Sort+1) * 10;
					$SQL[] = sprintf('(%d, %d, %d)', $GroupID, $Sort, $CollageID);
				}
			}

			$SQL = 'INSERT INTO collages_torrents (GroupID, Sort, CollageID) VALUES '
				. implode(', ', $SQL)
				. ' ON DUPLICATE KEY UPDATE Sort = VALUES (Sort)';

			$DB->query($SQL);
		}

	} else {
		$Sort = $_POST['sort'];
		if(!is_number($Sort)) { error(404); }
		$DB->query("UPDATE collages_torrents SET Sort='$Sort' WHERE CollageID='$CollageID' AND GroupID='$GroupID'");
	}

	$Cache->delete_value('collage_'.$CollageID);
	header('Location: collages.php?action=manage&collageid='.$CollageID);