<?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 apps to store config values in the
 * database.
 */

class OC_OCSClient{

	/**
	 * @brief Get the url of the OCS AppStore server.
	 * @returns string of the AppStore server
	 *
	 * This function returns the url of the OCS AppStore server. It´s possible to set it in the config file or it will fallback to the default
	 */
	private static function getAppStoreURL() {
		$url = OC_Config::getValue('appstoreurl', 'http://api.apps.owncloud.com/v1');
		return($url);
	}

        /**
         * @brief Get the url of the OCS KB server.
         * @returns string of the KB server
         * This function returns the url of the OCS knowledge base server. It´s possible to set it in the config file or it will fallback to the default
         */
        private static function getKBURL() {
                $url = OC_Config::getValue('knowledgebaseurl', 'http://api.apps.owncloud.com/v1');
                return($url);
        }

	/**
	 * @brief Get the content of an OCS url call.
	 * @returns string of the response
	 * This function calls an OCS server and returns the response. It also sets a sane timeout
	*/
	private static function getOCSresponse($url) {
		// set a sensible timeout of 10 sec to stay responsive even if the server is down.
		$ctx = stream_context_create(
			array(
				'http' => array(
					'timeout' => 10
				)
			)
		);      
		$data=@file_get_contents($url, 0, $ctx);
		return($data);
	}


	/**
	 * @brief Get all the categories from the OCS server
	 * @returns array with category ids
	 * @note returns NULL if config value appstoreenabled is set to false
	 * This function returns a list of all the application categories on the OCS server
	 */
	public static function getCategories() {
		if(OC_Config::getValue('appstoreenabled', true)==false) {
			return NULL;
		}
		$url=OC_OCSClient::getAppStoreURL().'/content/categories';
		$xml=OC_OCSClient::getOCSresponse($url);
		if($xml==FALSE) {
			return NULL;
		}
		$data=simplexml_load_string($xml);

		$tmp=$data->data;
		$cats=array();

		foreach($tmp->category as $value) {

			$id= (int) $value->id;
			$name= (string) $value->name;
			$cats[$id]=$name;

		}

		return $cats;
	}

	/**
	 * @brief Get all the applications from the OCS server
	 * @returns array with application data
	 *
	 * This function returns a list of all the applications on the OCS server
	 */
	public static function getApplications($categories,$page,$filter) {
		if(OC_Config::getValue('appstoreenabled', true)==false) {
			return(array());
		}

		if(is_array($categories)) {
			$categoriesstring=implode('x',$categories);
		}else{
			$categoriesstring=$categories;
		}

		$version='&version='.implode('x',\OC_Util::getVersion());
		$filterurl='&filter='.urlencode($filter);
		$url=OC_OCSClient::getAppStoreURL().'/content/data?categories='.urlencode($categoriesstring).'&sortmode=new&page='.urlencode($page).'&pagesize=100'.$filterurl.$version;
		$apps=array();
		$xml=OC_OCSClient::getOCSresponse($url);

		if($xml==FALSE) {
			return NULL;
		}
		$data=simplexml_load_string($xml);

		$tmp=$data->data->content;
		for($i = 0; $i < count($tmp); $i++) {
			$app=array();
			$app['id']=(string)$tmp[$i]->id;
			$app['name']=(string)$tmp[$i]->name;
			$app['type']=(string)$tmp[$i]->typeid;
			$app['typename']=(string)$tmp[$i]->typename;
			$app['personid']=(string)$tmp[$i]->personid;
			$app['license']=(string)$tmp[$i]->license;
			$app['detailpage']=(string)$tmp[$i]->detailpage;
			$app['preview']=(string)$tmp[$i]->smallpreviewpic1;
			$app['changed']=strtotime($tmp[$i]->changed);
			$app['description']=(string)$tmp[$i]->description;
			$app['score']=(string)$tmp[$i]->score;

			$apps[]=$app;
		}
		return $apps;
	}


	/**
	 * @brief Get an the applications from the OCS server
	 * @returns array with application data
	 *
	 * This function returns an  applications from the OCS server
	 */
	public static function getApplication($id) {
		if(OC_Config::getValue('appstoreenabled', true)==false) {
			return NULL;
		}
		$url=OC_OCSClient::getAppStoreURL().'/content/data/'.urlencode($id);
		$xml=OC_OCSClient::getOCSresponse($url);

		if($xml==FALSE) {
			OC_Log::write('core','Unable to parse OCS content',OC_Log::FATAL);
			return NULL;
		}
		$data=simplexml_load_string($xml);

		$tmp=$data->data->content;
		$app=array();
		$app['id']=$tmp->id;
		$app['name']=$tmp->name;
		$app['type']=$tmp->typeid;
		$app['typename']=$tmp->typename;
		$app['personid']=$tmp->personid;
		$app['detailpage']=$tmp->detailpage;
		$app['preview1']=$tmp->smallpreviewpic1;
		$app['preview2']=$tmp->smallpreviewpic2;
		$app['preview3']=$tmp->smallpreviewpic3;
		$app['changed']=strtotime($tmp->changed);
		$app['description']=$tmp->description;
		$app['detailpage']=$tmp->detailpage;
		$app['score']=$tmp->score;

		return $app;
	}

	/**
		* @brief Get the download url for an application from the OCS server
		* @returns array with application data
		*
		* This function returns an download url for an applications from the OCS server
		*/
	public static function getApplicationDownload($id,$item) {
		if(OC_Config::getValue('appstoreenabled', true)==false) {
			return NULL;
		}
		$url=OC_OCSClient::getAppStoreURL().'/content/download/'.urlencode($id).'/'.urlencode($item);
		$xml=OC_OCSClient::getOCSresponse($url);

		if($xml==FALSE) {
			OC_Log::write('core','Unable to parse OCS content',OC_Log::FATAL);
			return NULL;
		}
		$data=simplexml_load_string($xml);

		$tmp=$data->data->content;
		$app=array();
		if(isset($tmp->downloadlink)) {
			$app['downloadlink']=$tmp->downloadlink;
		}else{
			$app['downloadlink']='';
		}
		return $app;
	}


	/**
	 * @brief Get all the knowledgebase entries from the OCS server
	 * @returns array with q and a data
	 *
	 * This function returns a list of all the knowledgebase entries from the OCS server
	 */
	public static function getKnownledgebaseEntries($page, $pagesize, $search='') {
		$kbe = array('totalitems' => 0);
		if(OC_Config::getValue('knowledgebaseenabled', true)) {
			$p = (int) $page;
			$s = (int) $pagesize;
			$searchcmd = '';
			if ($search) {
				$searchcmd = '&search='.urlencode($search);
			}
			$url = OC_OCSClient::getKBURL().'/knowledgebase/data?type=150&page='. $p .'&pagesize='. $s . $searchcmd;
			$xml = OC_OCSClient::getOCSresponse($url);
			$data = @simplexml_load_string($xml);
			if($data===false) {
				OC_Log::write('core', 'Unable to parse knowledgebase content', OC_Log::FATAL);
				return null;
			}
			$tmp = $data->data->content;
			for($i = 0; $i < count($tmp); $i++) {
				$kbe[] = array(
					'id' => $tmp[$i]->id,
					'name' => $tmp[$i]->name,
					'description' => $tmp[$i]->description,
					'answer' => $tmp[$i]->answer,
					'preview1' => $tmp[$i]->smallpreviewpic1,
					'detailpage' => $tmp[$i]->detailpage
				);
			}
			$kbe['totalitems'] = $data->meta->totalitems;
		}
		return $kbe;
	}

}