<?php
/**
 * @author Björn Schießle <schiessle@owncloud.com>
 * @author Morris Jobke <hey@morrisjobke.de>
 * @author Robin McCorkell <rmccorkell@karoshi.org.uk>
 *
 * @copyright Copyright (c) 2015, ownCloud, Inc.
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program 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, version 3,
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */

namespace OC\Share;

class Hooks extends \OC\Share\Constants {
	/**
	 * Function that is called after a user is deleted. Cleans up the shares of that user.
	 * @param array $arguments
	 */
	public static function post_deleteUser($arguments) {
		// Delete any items shared with the deleted user
		$query = \OC_DB::prepare('DELETE FROM `*PREFIX*share`'
			.' WHERE `share_with` = ? AND `share_type` = ? OR `share_type` = ?');
		$query->execute(array($arguments['uid'], self::SHARE_TYPE_USER, self::$shareTypeGroupUserUnique));
		// Delete any items the deleted user shared
		$query = \OC_DB::prepare('SELECT `id` FROM `*PREFIX*share` WHERE `uid_owner` = ?');
		$result = $query->execute(array($arguments['uid']));
		while ($item = $result->fetchRow()) {
			Helper::delete($item['id']);
		}
	}

	/**
	 * Function that is called after a user is added to a group.
	 * TODO what does it do?
	 * @param array $arguments
	 */
	public static function post_addToGroup($arguments) {

		// Find the group shares and check if the user needs a unique target
		$query = \OC_DB::prepare('SELECT * FROM `*PREFIX*share` WHERE `share_type` = ? AND `share_with` = ?');
		$result = $query->execute(array(self::SHARE_TYPE_GROUP, $arguments['gid']));
		$query = \OC_DB::prepare('INSERT INTO `*PREFIX*share` (`item_type`, `item_source`,'
			.' `item_target`, `parent`, `share_type`, `share_with`, `uid_owner`, `permissions`,'
			.' `stime`, `file_source`, `file_target`) VALUES (?,?,?,?,?,?,?,?,?,?,?)');
		while ($item = $result->fetchRow()) {

			$sourceExists = \OC\Share\Share::getItemSharedWithBySource($item['item_type'], $item['item_source'], self::FORMAT_NONE, null, true, $arguments['uid']);

			if ($sourceExists) {
				$fileTarget = $sourceExists['file_target'];
				$itemTarget = $sourceExists['item_target'];
			} else {
				$itemTarget = Helper::generateTarget($item['item_type'], $item['item_source'], self::SHARE_TYPE_USER, $arguments['uid'],
					$item['uid_owner'], null, $item['parent']);

				// do we also need a file target
				if ($item['item_type'] === 'file' || $item['item_type'] === 'folder') {
					$fileTarget = Helper::generateTarget('file', $item['file_target'], self::SHARE_TYPE_USER, $arguments['uid'],
							$item['uid_owner'], null, $item['parent']);
				} else {
					$fileTarget = null;
				}
			}

			// Insert an extra row for the group share if the item or file target is unique for this user
			if ($itemTarget != $item['item_target'] || $fileTarget != $item['file_target']) {
				$query->execute(array($item['item_type'], $item['item_source'], $itemTarget, $item['id'],
					self::$shareTypeGroupUserUnique, $arguments['uid'], $item['uid_owner'], $item['permissions'],
					$item['stime'], $item['file_source'], $fileTarget));
				\OC_DB::insertid('*PREFIX*share');
			}
		}
	}

	/**
	 * Function that is called after a user is removed from a group. Shares are cleaned up.
	 * @param array $arguments
	 */
	public static function post_removeFromGroup($arguments) {
		$sql = 'SELECT `id`, `share_type` FROM `*PREFIX*share`'
			.' WHERE (`share_type` = ? AND `share_with` = ?) OR (`share_type` = ? AND `share_with` = ?)';
		$result = \OC_DB::executeAudited($sql, array(self::SHARE_TYPE_GROUP, $arguments['gid'],
			self::$shareTypeGroupUserUnique, $arguments['uid']));
		while ($item = $result->fetchRow()) {
			if ($item['share_type'] == self::SHARE_TYPE_GROUP) {
				// Delete all reshares by this user of the group share
				Helper::delete($item['id'], true, $arguments['uid']);
			} else {
				Helper::delete($item['id']);
			}
		}
	}

	/**
	 * Function that is called after a group is removed. Cleans up the shares to that group.
	 * @param array $arguments
	 */
	public static function post_deleteGroup($arguments) {
		$sql = 'SELECT `id` FROM `*PREFIX*share` WHERE `share_type` = ? AND `share_with` = ?';
		$result = \OC_DB::executeAudited($sql, array(self::SHARE_TYPE_GROUP, $arguments['gid']));
		while ($item = $result->fetchRow()) {
			Helper::delete($item['id']);
		}
	}

}