<?php
/**
 * ownCloud
 *
 * @author Michael Gapczynski
 * @copyright 2013 Michael Gapczynski mtgap@owncloud.com
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU AFFERO GENERAL PUBLIC LICENSE for more details.
 *
 * You should have received a copy of the GNU Affero General Public
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */

namespace OC\Files\Cache;

class Shared_Updater {

	/**
	* Correct the parent folders' ETags for all users shared the file at $target
	*
	* @param string $target
	*/
	static public function correctFolders($target) {
		$uid = \OCP\User::getUser();
		$uidOwner = \OC\Files\Filesystem::getOwner($target);
		$info = \OC\Files\Filesystem::getFileInfo($target);
		// Correct Shared folders of other users shared with
		$users = \OCP\Share::getUsersItemShared('file', $info['fileid'], $uidOwner, true);
		if (!empty($users)) {
			foreach ($users as $user) {
				// The ETag of the logged in user should already be updated
				if ($user !== $uid) {
					$etag = \OC\Files\Filesystem::getETag(''); 
					\OCP\Config::setUserValue($user, 'files_sharing', 'etag', $etag);
				}
			}
			// Correct folders of shared file owner
			if ($uidOwner !== $uid && $source = \OC_Share_Backend_File::getSource($target)) {
				\OC\Files\Filesystem::initMountPoints($source['uid_owner']);
				$source = '/'.$source['uid_owner'].'/'.$source['path'];
				$mtime = \OC\Files\Filesystem::filemtime($target);
				\OC\Files\Cache\Updater::correctFolder($source, $mtime);
			}
		}
	}

	/**
	 * @param array $params
	 */
	static public function writeHook($params) {
		self::correctFolders($params['path']);
	}

	/**
	 * @param array $params
	 */
	static public function renameHook($params) {
		self::correctFolders($params['oldpath']);
		self::correctFolders($params['newpath']);
	}

	/**
	 * @param array $params
	 */
	static public function deleteHook($params) {
		self::correctFolders($params['path']);
	}

}