<?php
  /**
   * ownCloud
   *
   * @author Frank Karlitschek
   * @author Jakob Sack
   * @copyright 2012 Frank Karlitschek frank@owncloud.org
   *
   * 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/>.
   *
   */

  
  /**
   * This class provides an easy way for storing user preferences.
   */

  OC_Preferences::$object = new \OC\Preferences(OC_DB::getConnection());

  class OC_Preferences{

  	public static $object;

  	/**

  	 * Get all users using the preferences
  	 * @return array an array of user ids

  	 *
  	 * This function returns a list of all users that have at least one entry
  	 * in the preferences table.
  	 */
  	public static function getUsers() {

  		return self::$object->getUsers();

  	}
  
  	/**

  	 * Get all apps of a user

  	 * @param string $user user

  	 * @return integer[] with app ids

  	 *
  	 * This function returns a list of all apps of the user that have at least
  	 * one entry in the preferences table.
  	 */
  	public static function getApps( $user ) {

  		return self::$object->getApps( $user );

  	}
  
  	/**

  	 * Get the available keys for an app

  	 * @param string $user user
  	 * @param string $app the app we are looking for

  	 * @return array an array of key names

  	 *
  	 * This function gets all keys of an app of an user. Please note that the
  	 * values are not returned.
  	 */
  	public static function getKeys( $user, $app ) {

  		return self::$object->getKeys( $user, $app );

  	}
  
  	/**

  	 * Gets the preference

  	 * @param string $user user
  	 * @param string $app app
  	 * @param string $key key
  	 * @param string $default = null, default value if the key does not exist
  	 * @return string the value or $default
  	 *
  	 * This function gets a value from the preferences table. If the key does
  	 * not exist the default value will be returned
  	 */
  	public static function getValue( $user, $app, $key, $default = null ) {

  		return self::$object->getValue( $user, $app, $key, $default );

  	}
  
  	/**

  	 * sets a value in the preferences

  	 * @param string $user user
  	 * @param string $app app
  	 * @param string $key key
  	 * @param string $value value

  	 * @param string $preCondition only set value if the key had a specific value before
  	 * @return bool true if value was set, otherwise false

  	 *
  	 * Adds a value to the preferences. If the key did not exist before, it
  	 * will be added automagically.
  	 */

  	public static function setValue( $user, $app, $key, $value, $preCondition = null ) {
  		return self::$object->setValue( $user, $app, $key, $value, $preCondition );

  	}
  
  	/**

  	 * Deletes a key

  	 * @param string $user user
  	 * @param string $app app
  	 * @param string $key key

  	 *
  	 * Deletes a key.
  	 */
  	public static function deleteKey( $user, $app, $key ) {

  		self::$object->deleteKey( $user, $app, $key );

  		return true;
  	}
  
  	/**

  	 * Remove app of user from preferences

  	 * @param string $user user
  	 * @param string $app app
  	 * @return bool
  	 *

  	 * Removes all keys in preferences belonging to the app and the user.

  	 */
  	public static function deleteApp( $user, $app ) {

  		self::$object->deleteApp( $user, $app );

  		return true;
  	}
  
  	/**

  	 * Remove user from preferences

  	 * @param string $user user
  	 * @return bool
  	 *

  	 * Removes all keys in preferences belonging to the user.

  	 */
  	public static function deleteUser( $user ) {

  		self::$object->deleteUser( $user );

  		return true;
  	}
  
  	/**

  	 * Remove app from all users

  	 * @param string $app app
  	 * @return bool
  	 *
  	 * Removes all keys in preferences belonging to the app.
  	 */
  	public static function deleteAppFromAllUsers( $app ) {

  		self::$object->deleteAppFromAllUsers( $app );

  		return true;
  	}
  }