<?php
  /**
   * ownCloud - Backend for Shared contacts
   *
   * @author Thomas Tanghus

   * @copyright 2013-2014 Thomas Tanghus (thomas@tanghus.net)

   *
   * 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 OCA\Contacts\Backend;
  
  use OCA\Contacts;
  
  /**

   * Backend class for shared address books.

   */

  class Shared extends Database {

  	/**
  	 * The name of the backend.
  	 *
  	 * @var string
  	 */

  	public $name = 'shared';

  
  	/**

  	 * The cached address books.

  	 *

  	 * @var array[]

  	 */

  	public $addressBooks = array();
  
  	/**
  	* {@inheritdoc}
  	*/

  	public function getAddressBooksForUser(array $options = array()) {
  
  		// workaround for https://github.com/owncloud/core/issues/2814
  		$maybeSharedAddressBook = \OCP\Share::getItemsSharedWith(
  			'addressbook',
  			Contacts\Share\Addressbook::FORMAT_ADDRESSBOOKS
  		);

  		foreach ($maybeSharedAddressBook as $sharedAddressbook) {
  
  			if (isset($sharedAddressbook['id'])) {
  				$this->addressBooks[$sharedAddressbook['id']] = $sharedAddressbook;
  				$this->addressBooks[$sharedAddressbook['id']]['backend'] = $this->name;
  			}

  		}
  
  		return $this->addressBooks;
  	}
  
  	/**

  	* {@inheritdoc}
  	*/
  	public function getAddressBook($addressBookId, array $options = array()) {
  
  		foreach ($this->addressBooks as $addressBook) {
  
  			if ($addressBook['id'] === $addressBookId) {
  				return $addressBook;
  			}
  
  		}

  		$addressBook = \OCP\Share::getItemSharedWithBySource(
  			'addressbook',

  			$addressBookId,

  			Contacts\Share\Addressbook::FORMAT_ADDRESSBOOKS
  		);

  		// Not sure if I'm doing it wrongly, or if its supposed to return
  		// the info in an array?
  		$addressBook = (isset($addressBook['permissions']) ? $addressBook : $addressBook[0]);

  
  		if(!isset($addressBook['permissions'])) {
  			return null;
  		}

  		$addressBook['backend'] = $this->name;

  		$this->addressBooks[] = $addressBook;

  		return $addressBook;
  	}
  
  	/**

  	* {@inheritdoc}
  	*/
  	public function getContacts($addressBookId, array $options = array()) {

  		$addressBook = $this->getAddressBook($addressBookId);
  
  		if (!$addressBook) {
  			throw new \Exception('Shared Address Book not found: ' . $addressBookId, 404);

  		}

  		$permissions = $addressBook['permissions'];

  		$cards = parent::getContacts($addressBookId, $options);

  		foreach ($cards as &$card) {

  			$card['permissions'] = $permissions;
  		}
  
  		return $cards;
  	}
  
  	/**

  	* {@inheritdoc}
  	*/
  	public function getContact($addressBookId, $id, array $options = array()) {
  
  		$addressBook = $this->getAddressBook($addressBookId);
  
  		if (!$addressBook) {
  			throw new \Exception('Shared Address Book not found: ' . $addressBookId, 404);

  		}

  		$permissions = $addressBook['permissions'];

  		$card = parent::getContact($addressBookId, $id, $options);
  
  		if (!$card) {

  			throw new \Exception('Shared Contact not found: ' . implode(',', $id), 404);
  		}

  		$card['permissions'] = $permissions;
  		return $card;
  	}
  }