<?php
/**
 * @copyright Copyright (c) 2016, ownCloud, Inc.
 *
 * @author Lukas Reschke <lukas@statuscode.ch>
 * @author Thomas Müller <thomas.mueller@tmit.eu>
 *
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program 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, version 3,
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */
namespace OC\Migration;

use OC\BackgroundJob\JobList;
use OC\BackgroundJob\TimedJob;
use OC\NeedsUpdateException;
use OC\Repair;
use OC_App;
use OCP\BackgroundJob\IJobList;
use OCP\ILogger;
use Symfony\Component\EventDispatcher\EventDispatcherInterface;

/**
 * Class BackgroundRepair
 *
 * @package OC\Migration
 */
class BackgroundRepair extends TimedJob {

	/** @var IJobList */
	private $jobList;

	/** @var ILogger */
	private $logger;

	/** @var EventDispatcherInterface */
	private $dispatcher;

	public function __construct(EventDispatcherInterface $dispatcher) {
		$this->dispatcher = $dispatcher;
	}

	/**
	 * run the job, then remove it from the job list
	 *
	 * @param JobList $jobList
	 * @param ILogger|null $logger
	 */
	public function execute($jobList, ILogger $logger = null) {
		// add an interval of 15 mins
		$this->setInterval(15*60);

		$this->jobList = $jobList;
		$this->logger = $logger;
		parent::execute($jobList, $logger);
	}

	/**
	 * @param array $argument
	 * @throws \Exception
	 * @throws \OC\NeedsUpdateException
	 */
	protected function run($argument) {
		if (!isset($argument['app']) || !isset($argument['step'])) {
			// remove the job - we can never execute it
			$this->jobList->remove($this, $this->argument);
			return;
		}
		$app = $argument['app'];

		try {
			$this->loadApp($app);
		} catch (NeedsUpdateException $ex) {
			// as long as the app is not yet done with it's offline migration
			// we better not start with the live migration
			return;
		}

		$step = $argument['step'];
		$repair = new Repair([], $this->dispatcher);
		try {
			$repair->addStep($step);
		} catch (\Exception $ex) {
			$this->logger->logException($ex,[
				'app' => 'migration'
			]);

			// remove the job - we can never execute it
			$this->jobList->remove($this, $this->argument);
			return;
		}

		// execute the repair step
		$repair->run();

		// remove the job once executed successfully
		$this->jobList->remove($this, $this->argument);
	}

	/**
	 * @codeCoverageIgnore
	 * @param $app
	 * @throws NeedsUpdateException
	 */
	protected function loadApp($app) {
		OC_App::loadApp($app);
	}
}