<?php
/**
 * @copyright Copyright (c) 2016, ownCloud, Inc.
 *
 * @author Daniel Kesselberg <mail@danielkesselberg.de>
 * @author Joas Schilling <coding@schilljs.com>
 * @author Morris Jobke <hey@morrisjobke.de>
 * @author Robin Appelman <robin@icewind.nl>
 * @author Roeland Jago Douma <roeland@famdouma.nl>
 * @author Temtaime <temtaime@gmail.com>
 * @author Thomas Müller <thomas.mueller@tmit.eu>
 * @author Vincent Petry <vincent@nextcloud.com>
 *
 * @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\Core\Command\Maintenance;

use Exception;
use OCP\App\IAppManager;
use OCP\EventDispatcher\Event;
use OCP\EventDispatcher\IEventDispatcher;
use OCP\IConfig;
use OC\Repair\Events\RepairAdvanceEvent;
use OC\Repair\Events\RepairErrorEvent;
use OC\Repair\Events\RepairFinishEvent;
use OC\Repair\Events\RepairInfoEvent;
use OC\Repair\Events\RepairStartEvent;
use OC\Repair\Events\RepairStepEvent;
use OC\Repair\Events\RepairWarningEvent;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Helper\ProgressBar;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;

class Repair extends Command {
	protected \OC\Repair $repair;
	protected IConfig $config;
	private IEventDispatcher $dispatcher;
	private ProgressBar $progress;
	private OutputInterface $output;
	private IAppManager $appManager;

	public function __construct(\OC\Repair $repair, IConfig $config, IEventDispatcher $dispatcher, IAppManager $appManager) {
		$this->repair = $repair;
		$this->config = $config;
		$this->dispatcher = $dispatcher;
		$this->appManager = $appManager;
		parent::__construct();
	}

	protected function configure() {
		$this
			->setName('maintenance:repair')
			->setDescription('repair this installation')
			->addOption(
				'include-expensive',
				null,
				InputOption::VALUE_NONE,
				'Use this option when you want to include resource and load expensive tasks');
	}

	protected function execute(InputInterface $input, OutputInterface $output): int {
		$repairSteps = $this->repair::getRepairSteps();

		if ($input->getOption('include-expensive')) {
			$repairSteps = array_merge($repairSteps, $this->repair::getExpensiveRepairSteps());
		}

		foreach ($repairSteps as $step) {
			$this->repair->addStep($step);
		}

		$apps = $this->appManager->getInstalledApps();
		foreach ($apps as $app) {
			if (!$this->appManager->isEnabledForUser($app)) {
				continue;
			}
			$info = $this->appManager->getAppInfo($app);
			if (!is_array($info)) {
				continue;
			}
			\OC_App::loadApp($app);
			$steps = $info['repair-steps']['post-migration'];
			foreach ($steps as $step) {
				try {
					$this->repair->addStep($step);
				} catch (Exception $ex) {
					$output->writeln("<error>Failed to load repair step for $app: {$ex->getMessage()}</error>");
				}
			}
		}

		$maintenanceMode = $this->config->getSystemValueBool('maintenance');
		$this->config->setSystemValue('maintenance', true);

		$this->progress = new ProgressBar($output);
		$this->output = $output;
		$this->dispatcher->addListener(RepairStartEvent::class, [$this, 'handleRepairFeedBack']);
		$this->dispatcher->addListener(RepairAdvanceEvent::class, [$this, 'handleRepairFeedBack']);
		$this->dispatcher->addListener(RepairFinishEvent::class, [$this, 'handleRepairFeedBack']);
		$this->dispatcher->addListener(RepairStepEvent::class, [$this, 'handleRepairFeedBack']);
		$this->dispatcher->addListener(RepairInfoEvent::class, [$this, 'handleRepairFeedBack']);
		$this->dispatcher->addListener(RepairWarningEvent::class, [$this, 'handleRepairFeedBack']);
		$this->dispatcher->addListener(RepairErrorEvent::class, [$this, 'handleRepairFeedBack']);

		$this->repair->run();

		$this->config->setSystemValue('maintenance', $maintenanceMode);
		return 0;
	}

	public function handleRepairFeedBack(Event $event): void {
		if ($event instanceof RepairStartEvent) {
			$this->progress->start($event->getMaxStep());
		} elseif ($event instanceof RepairAdvanceEvent) {
			$this->progress->advance($event->getIncrement());
		} elseif ($event instanceof RepairFinishEvent) {
			$this->progress->finish();
			$this->output->writeln('');
		} elseif ($event instanceof RepairStepEvent) {
			$this->output->writeln('<info> - ' . $event->getStepName() . '</info>');
		} elseif ($event instanceof RepairInfoEvent) {
			$this->output->writeln('<info>     - ' . $event->getMessage() . '</info>');
		} elseif ($event instanceof RepairWarningEvent) {
			$this->output->writeln('<comment>     - WARNING: ' . $event->getMessage() . '</comment>');
		} elseif ($event instanceof RepairErrorEvent) {
			$this->output->writeln('<error>     - ERROR: ' . $event->getMessage() . '</error>');
		}
	}
}
