<?php
  /**
   * ownCloud
   *
   * @author Thomas Müller
   * @copyright 2013 Thomas Müller thomas.mueller@tmit.eu
   *
   * 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 {
  
  	class ContactsManager implements \OCP\Contacts\IManager {
  
  		/**
  		 * This function is used to search and find contacts within the users address books.
  		 * In case $pattern is empty all contacts will be returned.
  		 *
  		 * @param string $pattern which should match within the $searchProperties
  		 * @param array $searchProperties defines the properties within the query pattern should match
  		 * @param array $options - for future use. One should always have options!
  		 * @return array of contacts which are arrays of key-value-pairs
  		 */
  		public function search($pattern, $searchProperties = array(), $options = array()) {
  			$result = array();
  			foreach($this->address_books as $address_book) {
  				$r = $address_book->search($pattern, $searchProperties, $options);
  				$result = array_merge($result, $r);
  			}
  
  			return $result;
  		}
  
  		/**
  		 * This function can be used to delete the contact identified by the given id
  		 *
  		 * @param object $id the unique identifier to a contact
  		 * @param $address_book_key
  		 * @return bool successful or not
  		 */
  		public function delete($id, $address_book_key) {
  			if (!array_key_exists($address_book_key, $this->address_books))
  				return null;
  
  			$address_book = $this->address_books[$address_book_key];
  			if ($address_book->getPermissions() & \OCP\PERMISSION_DELETE)
  				return null;
  
  			return $address_book->delete($id);
  		}
  
  		/**
  		 * This function is used to create a new contact if 'id' is not given or not present.
  		 * Otherwise the contact will be updated by replacing the entire data set.
  		 *
  		 * @param array $properties this array if key-value-pairs defines a contact
  		 * @param $address_book_key string to identify the address book in which the contact shall be created or updated
  		 * @return array representing the contact just created or updated
  		 */
  		public function createOrUpdate($properties, $address_book_key) {
  
  			if (!array_key_exists($address_book_key, $this->address_books))
  				return null;
  
  			$address_book = $this->address_books[$address_book_key];
  			if ($address_book->getPermissions() & \OCP\PERMISSION_CREATE)
  				return null;
  
  			return $address_book->createOrUpdate($properties);
  		}
  
  		/**
  		 * Check if contacts are available (e.g. contacts app enabled)
  		 *
  		 * @return bool true if enabled, false if not
  		 */
  		public function isEnabled() {
  			return !empty($this->address_books);
  		}
  
  		/**
  		 * @param \OCP\IAddressBook $address_book
  		 */
  		public function registerAddressBook(\OCP\IAddressBook $address_book) {
  			$this->address_books[$address_book->getKey()] = $address_book;
  		}
  
  		/**
  		 * @param \OCP\IAddressBook $address_book
  		 */
  		public function unregisterAddressBook(\OCP\IAddressBook $address_book) {
  			unset($this->address_books[$address_book->getKey()]);
  		}
  
  		/**
  		 * @return array
  		 */
  		public function getAddressBooks() {
  			$result = array();
  			foreach($this->address_books as $address_book) {
  				$result[$address_book->getKey()] = $address_book->getDisplayName();
  			}
  
  			return $result;
  		}
  
  		/**
  		 * removes all registered address book instances
  		 */
  		public function clear() {
  			$this->address_books = array();
  		}
  
  		/**
  		 * @var \OCP\IAddressBook[] which holds all registered address books
  		 */
  		private $address_books = array();
  
  		/**
  		 * In order to improve lazy loading a closure can be registered which will be called in case
  		 * address books are actually requested
  		 *
  		 * @param string $key
  		 * @param \Closure $callable
  		 */
  		function register($key, \Closure $callable)
  		{
  			//
  			//TODO: implement me
  			//
  		}
  	}
  }