<?php
  /**

   * ownCloud
   *
   * @author Jakob Sack
   * @copyright 2012 Jakob Sack owncloud@jakobsack.de
   *
   * 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/>.
   *
   */

  
  // Unfortunately we need this class for shutdown function

  class TemporaryCronClass {

  	public static $sent = false;
  	public static $lockfile = "";
  	public static $keeplock = false;
  }
  
  // We use this function to handle (unexpected) shutdowns
  function handleUnexpectedShutdown() {
  	// Delete lockfile

  	if (!TemporaryCronClass::$keeplock && file_exists(TemporaryCronClass::$lockfile)) {
  		unlink(TemporaryCronClass::$lockfile);

  	}

  	// Say goodbye if the app did not shutdown properly

  	if (!TemporaryCronClass::$sent) {
  		if (OC::$CLI) {
  			echo 'Unexpected error!' . PHP_EOL;
  		} else {
  			OC_JSON::error(array('data' => array('message' => 'Unexpected error!')));

  		}
  	}
  }

  try {

  	require_once 'lib/base.php';

  	session_write_close();

  	$logger = \OC_Log::$object;

  	// Don't do anything if ownCloud has not been installed
  	if (!OC_Config::getValue('installed', false)) {
  		exit(0);

  	}

  	// Handle unexpected errors
  	register_shutdown_function('handleUnexpectedShutdown');
  
  	// Delete temp folder
  	OC_Helper::cleanTmpNoClean();

  	// Exit if background jobs are disabled!
  	$appmode = OC_BackgroundJob::getExecutionType();
  	if ($appmode == 'none') {
  		TemporaryCronClass::$sent = true;
  		if (OC::$CLI) {
  			echo 'Background Jobs are disabled!' . PHP_EOL;
  		} else {
  			OC_JSON::error(array('data' => array('message' => 'Background jobs disabled!')));
  		}
  		exit(1);

  	}

  	if (OC::$CLI) {
  		// Create lock file first
  		TemporaryCronClass::$lockfile = OC_Config::getValue("datadirectory", OC::$SERVERROOT . '/data') . '/cron.lock';

  		// We call ownCloud from the CLI (aka cron)
  		if ($appmode != 'cron') {
  			// Use cron in future!
  			OC_BackgroundJob::setExecutionType('cron');
  		}
  
  		// check if backgroundjobs is still running
  		if (file_exists(TemporaryCronClass::$lockfile)) {
  			TemporaryCronClass::$keeplock = true;
  			TemporaryCronClass::$sent = true;
  			echo "Another instance of cron.php is still running!";
  			exit(1);
  		}
  
  		// Create a lock file
  		touch(TemporaryCronClass::$lockfile);
  
  		// Work
  		$jobList = new \OC\BackgroundJob\JobList();
  		$jobs = $jobList->getAll();
  		foreach ($jobs as $job) {
  			$job->execute($jobList, $logger);
  		}
  	} else {
  		// We call cron.php from some website
  		if ($appmode == 'cron') {
  			// Cron is cron :-P
  			OC_JSON::error(array('data' => array('message' => 'Backgroundjobs are using system cron!')));
  		} else {
  			// Work and success :-)
  			$jobList = new \OC\BackgroundJob\JobList();
  			$job = $jobList->getNext();
  			$job->execute($jobList, $logger);
  			$jobList->setLastJob($job);
  			OC_JSON::success();
  		}

  	}

  	// done!
  	TemporaryCronClass::$sent = true;
  	exit();
  
  } catch (Exception $ex) {
  	\OCP\Util::writeLog('cron', $ex->getMessage(), \OCP\Util::FATAL);
  }