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<?php

declare(strict_types=1);

namespace Mautic\CoreBundle\Command;

use Mautic\CoreBundle\Factory\TransifexFactory;
use Mautic\CoreBundle\Helper\LanguageHelper;
use Mautic\CoreBundle\Helper\PathsHelper;
use Mautic\CoreBundle\Helper\UrlHelper;
use Mautic\Transifex\Connector\Statistics;
use Mautic\Transifex\Connector\Translations;
use Mautic\Transifex\Exception\InvalidConfigurationException;
use Mautic\Transifex\Exception\ResponseException;
use Mautic\Transifex\Promise;
use Psr\Http\Message\ResponseInterface;
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 Symfony\Contracts\Translation\TranslatorInterface;

/**
 * CLI Command to pull language resources from Transifex.
 */
class PullTransifexCommand extends Command
{
    public const NAME = 'mautic:transifex:pull';

    public function __construct(
        private TransifexFactory $transifexFactory,
        private TranslatorInterface $translator,
        private PathsHelper $pathsHelper,
        private LanguageHelper $languageHelper
    ) {
        parent::__construct();
    }

    protected function configure(): void
    {
        $this->setName(self::NAME)
            ->addOption('language', null, InputOption::VALUE_OPTIONAL, 'Optional language to pull', null)
            ->addOption('bundle', null, InputOption::VALUE_OPTIONAL, 'Optional bundle to pull. Example value: WebhookBundle', null)
            ->addOption('path', null, InputOption::VALUE_OPTIONAL, 'Optional path to a directory where to store the traslations.', null)
            ->setHelp(<<<'EOT'
The <info>%command.name%</info> command is used to retrieve updated Mautic translations from Transifex and writes them to the filesystem.

<info>php %command.full_name%</info>

The command can optionally only pull files for a specific language with the --language option

<info>php %command.full_name% --language=<language_code></info>
EOT
            );
    }

    protected function execute(InputInterface $input, OutputInterface $output): int
    {
        $languageFilter = $input->getOption('language');
        $bundleFilter   = $input->getOption('bundle');
        $path           = $input->getOption('path');
        $files          = $this->languageHelper->getLanguageFiles();
        $translationDir = ($path ?? $this->pathsHelper->getTranslationsPath()).'/';

        try {
            $transifex = $this->transifexFactory->getTransifex();
        } catch (InvalidConfigurationException) {
            $output->writeln($this->translator->trans('mautic.core.command.transifex_no_credentials'));

            return Command::FAILURE;
        }

        $statistics = $transifex->getConnector(Statistics::class);
        \assert($statistics instanceof Statistics);

        $translations = $transifex->getConnector(Translations::class);
        \assert($translations instanceof Translations);

        /** @var \SplQueue<Promise> $queue */
        $queue = new \SplQueue();

        foreach ($files as $bundle => $stringFiles) {
            if ($bundleFilter && $bundle !== $bundleFilter) {
                continue;
            }
            foreach ($stringFiles as $file) {
                $name     = $bundle.' '.str_replace('.ini', '', basename($file));
                $resource = UrlHelper::stringURLUnicodeSlug($name);
                $output->writeln($this->translator->trans('mautic.core.command.transifex_processing_resource', ['%resource%' => $name]));

                try {
                    $response      = $statistics->getLanguageStats($resource);
                    $languageStats = json_decode((string) $response->getBody(), true);

                    foreach ($languageStats['data'] as $stats) {
                        $language = ltrim($stats['relationships']['language']['data']['id'], 'l:');
                        if ('en' === $language) {
                            continue;
                        }

                        // If we are filtering on a specific language, skip anything that doesn't match
                        if ($languageFilter && $languageFilter !== $language) {
                            continue;
                        }

                        $output->writeln($this->translator->trans('mautic.core.command.transifex_processing_language', ['%language%' => $language]));

                        $completed = $stats['attributes']['translated_strings'] / $stats['attributes']['total_strings'];

                        // We only want resources which are 80% completed
                        if ($completed >= 0.8) {
                            $path = $translationDir.$language.'/'.$bundle.'/'.basename($file);
                            try {
                                $promise = $transifex->getApiConnector()->createPromise($translations->download($resource, $language));
                                $promise->setFilePath($path);
                                $queue->enqueue($promise);
                            } catch (ResponseException $responseException) {
                                $output->writeln($this->translator->trans($responseException->getMessage()));
                            }
                        }
                    }
                } catch (\Exception $exception) {
                    $output->writeln($this->translator->trans('mautic.core.command.transifex_error_pulling_data', ['%message%' => $exception->getMessage()]));

                    return Command::FAILURE;
                }
            }
        }

        $transifex->getApiConnector()->fulfillPromises(
            $queue,
            function (ResponseInterface $response, Promise $promise) use ($output): void {
                try {
                    $this->languageHelper->createLanguageFile($promise->getFilePath(), $response->getBody()->__toString());
                } catch (\Exception $exception) {
                    $output->writeln($exception->getMessage());
                }
            },
            function (ResponseException $exception) use ($output): void {
                $output->writeln($exception->getMessage());
            }
        );

        $output->writeln($this->translator->trans('mautic.core.command.transifex_resource_downloaded'));

        return Command::SUCCESS;
    }

    protected static $defaultDescription = 'Fetches translations for Mautic from Transifex';
}