class LanguageTest

class LanguageTest extends KernelTestBase {
  
  /**
   * The CKEditor 5 plugin.
   *
   * @var \Drupal\ckeditor5\Plugin\Editor\CKEditor5
   */
  protected $ckeditor5;
  
  /**
   * {@inheritdoc}
   */
  protected static $modules = [
    'system',
    'user',
    'ckeditor5',
    'editor',
    'filter',
    'language',
    'locale',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $this->ckeditor5 = $this->container
      ->get('plugin.manager.editor')
      ->createInstance('ckeditor5');
    FilterFormat::create(Yaml::parseFile('core/profiles/standard/config/install/filter.format.basic_html.yml'))->save();
    Editor::create([
      'format' => 'basic_html',
      'editor' => 'ckeditor5',
    ])->save();
    $this->installConfig([
      'language',
    ]);
  }
  
  /**
   * Ensure that languages are resolved correctly.
   *
   * @param string $drupal_langcode
   *   The language code in Drupal.
   * @param string $cke5_langcode
   *   The language code in CKEditor 5.
   * @param bool $is_missing_mapping
   *   Whether this mapping is expected to be missing from language.mappings.
   *
   * @dataProvider provider
   */
  public function test(string $drupal_langcode, string $cke5_langcode, bool $is_missing_mapping = FALSE) : void {
    $editor = Editor::load('basic_html');
    ConfigurableLanguage::createFromLangcode($drupal_langcode)->save();
    $this->config('system.site')
      ->set('default_langcode', $drupal_langcode)
      ->save();
    if ($is_missing_mapping) {
      // CKEditor 5's UI language falls back to English, until the language
      // mapping is expanded.
      $settings = $this->ckeditor5
        ->getJSSettings($editor);
      $this->assertSame('en', $settings['language']['ui']);
      // Expand the language mapping.
      $config = $this->config('language.mappings');
      $mapping = $config->get('map');
      $mapping += [
        $cke5_langcode => $drupal_langcode,
      ];
      $config->set('map', $mapping)
        ->save();
    }
    $settings = $this->ckeditor5
      ->getJSSettings($editor);
    $this->assertSame($cke5_langcode, $settings['language']['ui']);
  }
  
  /**
   * Provides a list of language code pairs.
   *
   * @return \string[][]
   */
  public function provider() : array {
    $random_langcode = $this->randomMachineName();
    return [
      'Language code transformed from browser mappings' => [
        'drupal_langcode' => 'pt-pt',
        'cke_langcode' => 'pt',
      ],
      'Language code transformed from browser mappings 2' => [
        'drupal_langcode' => 'zh-hans',
        'cke_langcode' => 'zh-cn',
      ],
      'Language code both in Drupal and CKEditor' => [
        'drupal_langcode' => 'fi',
        'cke_langcode' => 'fi',
      ],
      'Language code not in Drupal but in CKEditor 5 requires new language.mappings entry' => [
        'drupal_langcode' => $random_langcode,
        'cke_langcode' => 'de-ch',
        'is_missing_mapping' => TRUE,
      ],
    ];
  }

}