<?php
  /**
   * ownCloud
   *
   * @author Bjoern Schiessle
   * @copyright 2014 Bjoern Schiessle <schiessle@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\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` = ?');
  		$result = $query->execute(array($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 = $result->fetchRow()) {
  			if ($item['item_type'] == 'file' || $item['item_type'] == 'file') {
  				$itemTarget = null;
  			} else {
  				$itemTarget = Helper::generateTarget($item['item_type'], $item['item_source'], self::SHARE_TYPE_USER,
  						$arguments['uid'], $item['uid_owner'], $item['item_target'], $item['id']);
  			}
  			if (isset($item['file_source'])) {
  				$fileTarget = Helper::generateTarget($item['item_type'], $item['item_source'], self::SHARE_TYPE_USER,
  					$arguments['uid'], $item['uid_owner'], $item['file_target'], $item['id']);
  			} 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']);
  		}
  	}
  
  }