<?php

declare(strict_types=1);
/**
 * @copyright Copyright (c) 2020 Joas Schilling <coding@schilljs.com>
 *
 * @license GNU AGPL version 3 or any later version
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * 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
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

namespace OCA\Talk\Command\Developer;

use OC\Core\Command\Base;
use OCP\App\IAppManager;
use OCP\IConfig;
use OCP\Server;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;

class UpdateDocs extends Base {
	public function __construct(
		private IConfig $config,
		private IAppManager $appManager,
	) {
		parent::__construct();
	}

	public function isEnabled(): bool {
		return $this->config->getSystemValue('debug', false) === true;
	}

	protected function configure(): void {
		$this
			->setName('talk:developer:update-docs')
			->setDescription('Update documentation of commands')
		;
	}

	protected function execute(InputInterface $input, OutputInterface $output): int {
		$info = $this->appManager->getAppInfo('spreed');
		$documentation = "# Talk occ commands\n\n";
		foreach ($info['commands'] as $namespace) {
			if ($namespace === self::class) {
				continue;
			}

			$command = $this->getCommand($namespace);
			$documentation .= $this->getDocumentation($command) . "\n";
		}

		$handle = fopen(__DIR__ . '/../../../docs/occ.md', 'w');
		fwrite($handle, $documentation);
		fclose($handle);
		return 0;
	}

	protected function getCommand(string $namespace): Command {
		$command = Server::get($namespace);
		// Clean full definition of command that have the default Symfony options
		$command->setApplication($this->getApplication());
		return $command;
	}

	protected function getDocumentation(Command $command): string {
		$doc = '## ' . $command->getName() . "\n\n";
		$doc .= $command->getDescription() . "\n\n";
		$doc .=
			'### Usage' . "\n\n" .
			array_reduce(
				array_merge(
					[$command->getSynopsis()],
					$command->getAliases(),
					$command->getUsages()
				),
				function ($carry, $usage) {
					return $carry.'* `'.$usage.'`'."\n";
				}
			);
		$doc .= $this->describeInputDefinition($command);

		return $doc;
	}

	protected function describeInputDefinition(Command $command): string {
		$definition = $command->getDefinition();
		$text = '';
		if (\count($definition->getArguments()) > 0) {
			$text .= "\n";
			$text .= "| Arguments | Description | Is required | Is array | Default |\n";
			$text .= '|---|---|---|---|---|';
			foreach ($definition->getArguments() as $argument) {
				$describeInputArgument = $this->describeInputArgument($argument);
				if ($describeInputArgument) {
					$text .= "\n" . $describeInputArgument;
				}
			}
			$text .= "\n";
		}

		if (\count($definition->getOptions()) > 0) {
			$text .= "\n";

			$text .= "| Options | Description | Accept value | Is value required | Is multiple | Default |\n";
			$text .= '|---|---|---|---|---|---|';
			foreach ($definition->getOptions() as $option) {
				$describeInputOption = $this->describeInputOption($option);
				if ($describeInputOption) {
					$text .= "\n" . $describeInputOption;
				}
			}
			$text .= "\n";
		}
		return $text;
	}

	protected function describeInputArgument(InputArgument $argument): string {
		$description = $argument->getDescription();

		return
			'| `'.($argument->getName() ?: '<none>') . '` | ' .
			($description ? preg_replace('/\s*[\r\n]\s*/', ' ', $description) : '') . ' | ' .
			($argument->isRequired() ? 'yes' : 'no') . ' | ' .
			($argument->isArray() ? 'yes' : 'no') . ' | ' .
			($argument->isRequired() ? '*Required*' : '`' . str_replace("\n", '', var_export($argument->getDefault(), true)) . '`') . ' |';
	}

	protected function describeInputOption(InputOption $option): string {
		$name = '--'.$option->getName();
		if ($option->getShortcut()) {
			$name .= '\|-'.str_replace('|', '\|-', $option->getShortcut());
		}
		$description = $option->getDescription();

		return
			'| `' . $name . '` | ' .
			($description ? preg_replace('/\s*[\r\n]\s*/', " ", $description) : '') . ' | '.
			($option->acceptValue() ? 'yes' : 'no') . ' | ' .
			($option->isValueRequired() ? 'yes' : 'no') . ' | ' .
			($option->isArray() ? 'yes' : 'no') . ' | ' .
			($option->isValueRequired() ? '*Required*' : '`' . str_replace("\n", '', var_export($option->getDefault(), true)) . '`') . ' |';
	}
}