<?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;
	}
}
