<?php
  /**

   * ownCloud
   *
   * @author Frank Karlitschek
   * @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/>.
   *
   */

  
  /**
   * Public interface of ownCloud for apps to use.
   * Config Class
   *
   */
  
  /**

   * Use OCP namespace for all classes that are considered public.

   *
   * Classes that use this namespace are for use by apps, and not for use by internal
   * OC classes
   */
  namespace OCP;
  
  /**
   * This class provides functions to read and write configuration data.
   * configuration can be on a system, application or user level
   */
  class Config {
  	/**

  	 * Gets a value from config.php

  	 * @param string $key key
  	 * @param string $default = null default value
  	 * @return string the value or $default
  	 *
  	 * This function gets the value from config.php. If it does not exist,
  	 * $default will be returned.
  	 */
  	public static function getSystemValue( $key, $default = null ) {

  		return \OC_Config::getValue( $key, $default );

  	}
  
  	/**

  	 * Sets a value

  	 * @param string $key key
  	 * @param string $value value
  	 * @return bool
  	 *
  	 * This function sets the value and writes the config.php. If the file can
  	 * not be written, false will be returned.
  	 */
  	public static function setSystemValue( $key, $value ) {

  		try {
  			\OC_Config::setValue( $key, $value );
  		} catch (Exception $e) {
  			return false;
  		}
  		return true;

  	}
  
  	/**

  	 * Gets the config value

  	 * @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 appconfig table. If the key does
  	 * not exist the default value will be returned
  	 */
  	public static function getAppValue( $app, $key, $default = null ) {

  		return \OC_Appconfig::getValue( $app, $key, $default );

  	}
  
  	/**

  	 * Sets a value in the appconfig

  	 * @param string $app app
  	 * @param string $key key
  	 * @param string $value value
  	 * @return string true/false
  	 *
  	 * Sets a value. If the key did not exist before it will be created.
  	 */
  	public static function setAppValue( $app, $key, $value ) {

  		try {
  			\OC_Appconfig::setValue( $app, $key, $value );
  		} catch (Exception $e) {
  			return false;
  		}
  		return true;

  	}
  
  	/**

  	 * 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 getUserValue( $user, $app, $key, $default = null ) {

  		return \OC_Preferences::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

  	 * @return bool

  	 *
  	 * Adds a value to the preferences. If the key did not exist before, it
  	 * will be added automagically.
  	 */
  	public static function setUserValue( $user, $app, $key, $value ) {

  		try {
  			\OC_Preferences::setValue( $user, $app, $key, $value );
  		} catch (Exception $e) {
  			return false;
  		}
  		return true;

  	}
  }