class PackageManagerFixtureCreator

final class PackageManagerFixtureCreator {
    private const FIXTURE_PATH = __DIR__ . '/../modules/package_manager/tests/fixtures/fake_site';
    private const CORE_ROOT_PATH = __DIR__ . '/../..';
    
    /**
     * Creates the fixture.
     */
    public static function createFixture() : void {
        // Copy drupal scaffold file mapping from core/composer.json to
        // fixtures' core/composer.json.
        $core_composer_json = new JsonFile(static::CORE_ROOT_PATH . '/core/composer.json');
        $core_composer_data = $core_composer_json->read();
        $fixture_core_composer_file = new JsonFile(static::FIXTURE_PATH . "/../path_repos/drupal--core/composer.json");
        $fixture_core_composer_data = $fixture_core_composer_file->read();
        $fixture_core_composer_data['extra']['drupal-scaffold']['file-mapping'] = $core_composer_data['extra']['drupal-scaffold']['file-mapping'];
        $fixture_core_composer_file->write($fixture_core_composer_data);
        $fixture_packages_json = new JsonFile(static::FIXTURE_PATH . '/packages.json');
        $fixture_packages_data = $fixture_packages_json->read();
        foreach ($fixture_packages_data['packages']['drupal/core'] as &$release) {
            $release['extra']['drupal-scaffold']['file-mapping'] = $core_composer_data['extra']['drupal-scaffold']['file-mapping'];
        }
        $fixture_packages_json->write($fixture_packages_data);
        $fs = new Filesystem();
        $fs->remove(static::FIXTURE_PATH . "/composer.lock");
        // Remove all the vendor folders but leave our 2 test files.
        // @see \Drupal\Tests\package_manager\Kernel\PathExcluder\VendorHardeningExcluderTest
        self::removeAllExcept(static::FIXTURE_PATH . "/vendor", [
            '.htaccess',
            'web.config',
        ]);
        self::runComposerCommand([
            'install',
        ]);
        static::removeAllExcept(static::FIXTURE_PATH . '/vendor/composer', [
            'installed.json',
            'installed.php',
        ]);
        $fs->remove(static::FIXTURE_PATH . '/vendor/autoload.php');
        print "\nFixture updated.\nRunning phpcbf";
        $process = new Process([
            'composer',
            'phpcbf',
            static::FIXTURE_PATH,
        ], static::CORE_ROOT_PATH);
        $process->run();
        print "\nFixture created 🎉.";
    }
    
    /**
     * Runs a Composer command at the fixture root.
     *
     * @param array $command
     *   The command to run as passed to
     *   \Symfony\Component\Process\Process::__construct.
     *
     * @return string
     *   The Composer command output.
     */
    private static function runComposerCommand(array $command) : string {
        array_unshift($command, 'composer');
        $command[] = "--working-dir=" . static::FIXTURE_PATH;
        $process = new Process($command, env: [
            'COMPOSER_MIRROR_PATH_REPOS' => '1',
        ]);
        $process->run();
        if (!$process->isSuccessful()) {
            throw new ProcessFailedException($process);
        }
        return $process->getOutput();
    }
    
    /**
     * Removes all files in a directory except the ones specified.
     *
     * @param string $directory
     *   The directory path.
     * @param string[] $files_to_keep
     *   The files to not delete.
     */
    private static function removeAllExcept(string $directory, array $files_to_keep) : void {
        if (!is_dir($directory)) {
            throw new \LogicException("Expected directory {$directory}");
        }
        $paths_to_remove = glob("{$directory}/*");
        $fs = new Filesystem();
        foreach ($paths_to_remove as $path_to_remove) {
            $base_name = basename($path_to_remove);
            if (!in_array($base_name, $files_to_keep, TRUE)) {
                $fs->remove($path_to_remove);
            }
        }
    }

}