<?php
/**
 * @copyright Copyright (c) 2016, ownCloud, Inc.
 *
 * @author Joas Schilling <coding@schilljs.com>
 * @author Morris Jobke <hey@morrisjobke.de>
 * @author Robin McCorkell <robin@mccorkell.me.uk>
 * @author Roeland Jago Douma <roeland@famdouma.nl>
 * @author Thomas Pulzer <t.pulzer@kniel.de>
 *
 * @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\Log;

use OCP\IConfig;

use Stecman\Component\Symfony\Console\BashCompletion\Completion;
use Stecman\Component\Symfony\Console\BashCompletion\Completion\ShellPathCompletion;
use Stecman\Component\Symfony\Console\BashCompletion\CompletionContext;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;

class File extends Command implements Completion\CompletionAwareInterface {

	/** @var IConfig */
	protected $config;

	public function __construct(IConfig $config) {
		$this->config = $config;
		parent::__construct();
	}

	protected function configure() {
		$this
			->setName('log:file')
			->setDescription('manipulate logging backend')
			->addOption(
				'enable',
				null,
				InputOption::VALUE_NONE,
				'enable this logging backend'
			)
			->addOption(
				'file',
				null,
				InputOption::VALUE_REQUIRED,
				'set the log file path'
			)
			->addOption(
				'rotate-size',
				null,
				InputOption::VALUE_REQUIRED,
				'set the file size for log rotation, 0 = disabled'
			)
		;
	}

	protected function execute(InputInterface $input, OutputInterface $output) {
		$toBeSet = [];

		if ($input->getOption('enable')) {
			$toBeSet['log_type'] = 'file';
		}

		if ($file = $input->getOption('file')) {
			$toBeSet['logfile'] = $file;
		}

		if (($rotateSize = $input->getOption('rotate-size')) !== null) {
			$rotateSize = \OCP\Util::computerFileSize($rotateSize);
			$this->validateRotateSize($rotateSize);
			$toBeSet['log_rotate_size'] = $rotateSize;
		}

		// set config
		foreach ($toBeSet as $option => $value) {
			$this->config->setSystemValue($option, $value);
		}

		// display config
		// TODO: Drop backwards compatibility for config in the future
		$logType = $this->config->getSystemValue('log_type', 'file');
		if ($logType === 'file' || $logType === 'owncloud') {
			$enabledText = 'enabled';
		} else {
			$enabledText = 'disabled';
		}
		$output->writeln('Log backend file: '.$enabledText);

		$dataDir = $this->config->getSystemValue('datadirectory', \OC::$SERVERROOT.'/data');
		$defaultLogFile = rtrim($dataDir, '/').'/nextcloud.log';
		$output->writeln('Log file: '.$this->config->getSystemValue('logfile', $defaultLogFile));

		$rotateSize = $this->config->getSystemValue('log_rotate_size', 100*1024*1024);
		if ($rotateSize) {
			$rotateString = \OCP\Util::humanFileSize($rotateSize);
		} else {
			$rotateString = 'disabled';
		}
		$output->writeln('Rotate at: '.$rotateString);
	}

	/**
	 * @param mixed $rotateSize
	 * @throws \InvalidArgumentException
	 */
	protected function validateRotateSize(&$rotateSize) {
		if ($rotateSize === false) {
			throw new \InvalidArgumentException('Error parsing log rotation file size');
		}
		$rotateSize = (int) $rotateSize;
		if ($rotateSize < 0) {
			throw new \InvalidArgumentException('Log rotation file size must be non-negative');
		}
	}

	/**
	 * @param string $optionName
	 * @param CompletionContext $context
	 * @return string[]
	 */
	public function completeOptionValues($optionName, CompletionContext $context) {
		if ($optionName === 'file') {
			$helper = new ShellPathCompletion(
				$this->getName(),
				'file',
				Completion::TYPE_OPTION
			);
			return $helper->run();
		} else if ($optionName === 'rotate-size') {
			return [0];
		}
		return [];
	}

	/**
	 * @param string $argumentName
	 * @param CompletionContext $context
	 * @return string[]
	 */
	public function completeArgumentValues($argumentName, CompletionContext $context) {
		return [];
	}
}