<?php

declare(strict_types=1);

/**
 * SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
 * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
 * SPDX-License-Identifier: AGPL-3.0-only
 */
namespace OC\Core\Command\L10n;

use DirectoryIterator;

use OCP\App\IAppManager;
use Stecman\Component\Symfony\Console\BashCompletion\Completion\CompletionAwareInterface;
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;
use UnexpectedValueException;

class CreateJs extends Command implements CompletionAwareInterface {
	public function __construct(
		protected IAppManager $appManager,
	) {
		parent::__construct();
	}

	protected function configure() {
		$this
			->setName('l10n:createjs')
			->setDescription('Create javascript translation files for a given app')
			->addArgument(
				'app',
				InputOption::VALUE_REQUIRED,
				'name of the app'
			)
			->addArgument(
				'lang',
				InputOption::VALUE_OPTIONAL,
				'name of the language'
			);
	}

	protected function execute(InputInterface $input, OutputInterface $output): int {
		$app = $input->getArgument('app');
		$lang = $input->getArgument('lang');

		$path = $this->appManager->getAppPath($app);
		$languages = $lang;
		if (empty($lang)) {
			$languages = $this->getAllLanguages($path);
		}

		foreach ($languages as $lang) {
			$this->writeFiles($app, $path, $lang, $output);
		}
		return 0;
	}

	private function getAllLanguages($path) {
		$result = [];
		foreach (new DirectoryIterator("$path/l10n") as $fileInfo) {
			if ($fileInfo->isDot()) {
				continue;
			}
			if ($fileInfo->isDir()) {
				continue;
			}
			if ($fileInfo->getExtension() !== 'php') {
				continue;
			}
			$result[] = substr($fileInfo->getBasename(), 0, -4);
		}

		return $result;
	}

	private function writeFiles($app, $path, $lang, OutputInterface $output) {
		[$translations, $plurals] = $this->loadTranslations($path, $lang);
		$this->writeJsFile($app, $path, $lang, $output, $translations, $plurals);
		$this->writeJsonFile($path, $lang, $output, $translations, $plurals);
	}

	private function writeJsFile($app, $path, $lang, OutputInterface $output, $translations, $plurals) {
		$jsFile = "$path/l10n/$lang.js";
		if (file_exists($jsFile)) {
			$output->writeln("File already exists: $jsFile");
			return;
		}
		$content = "OC.L10N.register(\n    \"$app\",\n    {\n    ";
		$jsTrans = [];
		foreach ($translations as $id => $val) {
			if (is_array($val)) {
				$val = '[ ' . implode(',', $val) . ']';
			}
			$jsTrans[] = "\"$id\" : \"$val\"";
		}
		$content .= implode(",\n    ", $jsTrans);
		$content .= "\n},\n\"$plurals\");\n";

		file_put_contents($jsFile, $content);
		$output->writeln("Javascript translation file generated: $jsFile");
	}

	private function writeJsonFile($path, $lang, OutputInterface $output, $translations, $plurals) {
		$jsFile = "$path/l10n/$lang.json";
		if (file_exists($jsFile)) {
			$output->writeln("File already exists: $jsFile");
			return;
		}
		$content = ['translations' => $translations, 'pluralForm' => $plurals];
		file_put_contents($jsFile, json_encode($content));
		$output->writeln("Json translation file generated: $jsFile");
	}

	private function loadTranslations($path, $lang) {
		$phpFile = "$path/l10n/$lang.php";
		$TRANSLATIONS = [];
		$PLURAL_FORMS = '';
		if (!file_exists($phpFile)) {
			throw new UnexpectedValueException("PHP translation file <$phpFile> does not exist.");
		}
		require $phpFile;

		return [$TRANSLATIONS, $PLURAL_FORMS];
	}

	/**
	 * Return possible values for the named option
	 *
	 * @param string $optionName
	 * @param CompletionContext $context
	 * @return string[]
	 */
	public function completeOptionValues($optionName, CompletionContext $context) {
		return [];
	}

	/**
	 * Return possible values for the named argument
	 *
	 * @param string $argumentName
	 * @param CompletionContext $context
	 * @return string[]
	 */
	public function completeArgumentValues($argumentName, CompletionContext $context) {
		if ($argumentName === 'app') {
			return \OC_App::getAllApps();
		} elseif ($argumentName === 'lang') {
			$appName = $context->getWordAtIndex($context->getWordIndex() - 1);
			return $this->getAllLanguages(\OC_App::getAppPath($appName));
		}
		return [];
	}
}