<?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/>.
 *
 */

/**
 * Class that handels autoupdating of ownCloud
 */
class OC_Updater{

	/**
	 * Check if a new version is available
	 */
	public static function check() {
		OC_Appconfig::setValue('core', 'lastupdatedat',microtime(true));
		if(OC_Appconfig::getValue('core', 'installedat','')=='') OC_Appconfig::setValue('core', 'installedat',microtime(true));

		$updaterurl='http://apps.owncloud.com/updater.php';
		$version=OC_Util::getVersion();
		$version['installed']=OC_Appconfig::getValue('core', 'installedat');
		$version['updated']=OC_Appconfig::getValue('core', 'lastupdatedat');
		$version['updatechannel']='stable';
		$version['edition']=OC_Util::getEditionString();
		$versionstring=implode('x',$version);

		//fetch xml data from updater
		$url=$updaterurl.'?version='.$versionstring;

		// set a sensible timeout of 10 sec to stay responsive even if the update server is down.
		$ctx = stream_context_create(
			array( 
				'http' => array( 
					'timeout' => 10 
				) 
			) 
		); 
		$xml=@file_get_contents($url, 0, $ctx);
                if($xml==FALSE) {
                        return array();
                }
                $data=@simplexml_load_string($xml);

		$tmp=array();
                $tmp['version'] = $data->version;
                $tmp['versionstring'] = $data->versionstring;
                $tmp['url'] = $data->url;
                $tmp['web'] = $data->web;

                return $tmp;
	}

	public static function ShowUpdatingHint() {
		$l = OC_L10N::get('lib');

		if(OC_Config::getValue('updatechecker', true)==true) {
			$data=OC_Updater::check();
			if(isset($data['version']) and $data['version']<>'') {
				$txt='<span style="color:#AA0000; font-weight:bold;">'.$l->t('%s is available. Get <a href="%s">more information</a>',array($data['versionstring'], $data['web'])).'</span>';
			}else{
				$txt=$l->t('up to date');
			}
		}else{
			$txt=$l->t('updates check is disabled');
		}
		return($txt);
	}


	/**
	 * do ownCloud update
	 */
	public static function doUpdate() {

		//update ownCloud core

		//update all apps

		//update version in config

	}
}
