<?php
  
  /**
   * ownCloud - Documents App
   *
   * @author Victor Dubiniuk
   * @copyright 2013 Victor Dubiniuk victor.dubiniuk@gmail.com
   *
   * This file is licensed under the Affero General Public License version 3 or
   * later.
   */
  
  namespace OCA\Documents;
  
  class SessionController extends Controller{
  	
  	public static function joinAsGuest($args){
  		self::preDispatchGuest();
  		
  		$uid = Helper::getArrayValueByKey($_POST, 'name');
  		$guestUid = substr($uid, 0, 16);
  		
  		try {
  			$token = Helper::getArrayValueByKey($args, 'token');
  			$file = File::getByShareToken($token);
  			$session = Db_Session::start($uid, $file, true);
  			\OCP\JSON::success($session);
  		} catch (\Exception $e){
  			Helper::warnLog('Starting a session failed. Reason: ' . $e->getMessage());
  			\OCP\JSON::error();
  			exit();
  		}
  	}
  
  	public static function joinAsUser($args){
  		$uid = self::preDispatch();
  		$fileId = Helper::getArrayValueByKey($args, 'file_id');
  		
  		try {
  			$view = \OC\Files\Filesystem::getView();
  			$path = $view->getPath($fileId);
  			
  			if ($view->isUpdatable($path)) {
  				$file = new File($fileId);
  				$session = Db_Session::start($uid, $file);
  				\OCP\JSON::success($session);
  			} else {
  				$info = $view->getFileInfo();
  				\OCP\JSON::success(array(
  					'permissions' => $info['permissions'],
  					'id' => $fileId
  				));
  			}
  			exit();
  		} catch (\Exception $e){
  			Helper::warnLog('Starting a session failed. Reason: ' . $e->getMessage());
  			\OCP\JSON::error();
  			exit();
  		}
  	}
  	
  
  	/**
  	 * Store the document content to its origin
  	 */
  	public static function save(){
  		try {
  			$esId = @$_SERVER['HTTP_WEBODF_SESSION_ID'];
  			if (!$esId){
  				throw new \Exception('Session id can not be empty');
  			}
  			
  			$memberId = @$_SERVER['HTTP_WEBODF_MEMBER_ID'];
  			$currentMember = new Db_Member();
  			$currentMember->load($memberId);
  			if (is_null($currentMember->getIsGuest()) || $currentMember->getIsGuest()){
  				$uid = self::preDispatchGuest();
  			} else {
  				self::preDispatch();
  			}
  			
  			//check if member belongs to the session
  			if ($esId != $currentMember->getEsId()){
  				throw new \Exception($memberId . ' does not belong to session ' . $esId);
  			}
  			
  			$sessionRevision = @$_SERVER['HTTP_WEBODF_SESSION_REVISION'];
  			
  			$stream = fopen('php://input','r');
  			if (!$stream){
  				throw new \Exception('New content missing');
  			}
  			$content = stream_get_contents($stream);
  
  			$session = new Db_Session();
  			$session->load($esId);
  			
  			if (!$session->getEsId()){
  				throw new \Exception('Session does not exist');
  			}
  
  			try {
  				if ($currentMember->getIsGuest()){
  					$file = File::getByShareToken($currentMember->getToken());
  				} else {
  					$file = new File($session->getFileId());
  				}
  				
  				list($view, $path) = $file->getOwnerViewAndPath();
  			} catch (\Exception $e){
  				//File was deleted or unshared. We need to save content as new file anyway
  				//Sorry, but for guests it would be lost :(
  				$view = new \OC\Files\View('/' . $uid . '/files');
  		
  				$dir = \OCP\Config::getUserValue(\OCP\User::getUser(), 'documents', 'save_path', '');
  				$path = Helper::getNewFileName($view, $dir . 'New Document.odt');
  			}
  			
  			$member = new Db_Member();
  			$members = $member->getActiveCollection($esId);
  			$memberIds = array_map(
  				function($x){
  					return ($x['member_id']);
  				},
  				$members
  			);
  			
  			// Active users except current user
  			$memberCount = count($memberIds) - 1;
  			
  			if ($view->file_exists($path)){
  				$proxyStatus = \OC_FileProxy::$enabled;
  				\OC_FileProxy::$enabled = false;	
  				$currentHash = sha1($view->file_get_contents($path));
  				\OC_FileProxy::$enabled = $proxyStatus;
  				
  				if (!Helper::isVersionsEnabled() && $currentHash !== $session->getGenesisHash()){
  					// Original file was modified externally. Save to a new one
  					$path = Helper::getNewFileName($view, $path, '-conflict');
  				}
  				
  				$mimetype = $view->getMimeType($path);
  			} else {
  				$mimetype = Storage::MIMETYPE_LIBREOFFICE_WORDPROCESSOR;
  			}
  			
  			$data = Filter::write($content, $mimetype);
  			
  			if ($view->file_put_contents($path, $data['content'])){
  				// Not a last user
  				if ($memberCount>0){
  					// Update genesis hash to prevent conflicts
  					Helper::debugLog('Update hash');
  					$session->updateGenesisHash($esId, sha1($data['content']));
  				} else {
  					// Last user. Kill session data
  					Db_Session::cleanUp($esId);
  				}
  				
  				$view->touch($path);
  			}
  			\OCP\JSON::success();
  		} catch (\Exception $e){
  			Helper::warnLog('Saving failed. Reason:' . $e->getMessage());
  			//\OCP\JSON::error(array('message'=>$e->getMessage()));
  			\OC_Response::setStatus(500);
  		}
  		exit();
  	}
  	
  	public static function info(){
  		self::preDispatch();
  		$items = @$_POST['items'];
  		$info = array();
  
  		if (is_array($items)){
  			$session = new Db_Session();
  			$info = $session->getInfoByFileId($items);
  		}
  
  		\OCP\JSON::success(array(
  			"info" => $info
  		));
  	}
  	
  	public static function listAll(){
  		self::preDispatch();
  		$session = new Db_Session();
  		$sessions = $session->getCollection();
  
  		$preparedSessions = array_map(
  				function($x){
  					return ($x['es_id']);
  				}, $sessions
  		);
  		\OCP\JSON::success(array(
  			"session_list" => $preparedSessions
  		));
  	}
  
  }