class Language

class Language extends CKEditor5PluginDefault implements CKEditor5PluginConfigurableInterface {
    use CKEditor5PluginConfigurableTrait;
    
    /**
     * {@inheritdoc}
     */
    public function getDynamicPluginConfig(array $static_plugin_config, EditorInterface $editor) : array {
        $predefined_languages = $this->configuration['language_list'] === 'all' ? LanguageManager::getStandardLanguageList() : LanguageManager::getUnitedNationsLanguageList();
        // Generate the language_list setting as expected by the CKEditor Language
        // plugin, but key the values by the full language name so that we can sort
        // them later on.
        $language_list = [];
        foreach ($predefined_languages as $langcode => $language) {
            $english_name = $language[0];
            $direction = empty($language[2]) ? NULL : $language[2];
            $language_list[$english_name] = [
                'title' => $english_name,
                'languageCode' => $langcode,
            ];
            if ($direction === LanguageInterface::DIRECTION_RTL) {
                $language_list[$english_name]['textDirection'] = 'rtl';
            }
        }
        // Sort on full language name.
        ksort($language_list);
        $dynamic_plugin_config = $static_plugin_config;
        $dynamic_plugin_config['language']['textPartLanguage'] = array_values($language_list);
        return $dynamic_plugin_config;
    }
    
    /**
     * {@inheritdoc}
     *
     * @see \Drupal\editor\Form\EditorImageDialog
     * @see editor_image_upload_settings_form()
     */
    public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
        $predefined_languages = LanguageManager::getStandardLanguageList();
        $form['language_list'] = [
            '#title' => $this->t('Language list'),
            '#title_display' => 'invisible',
            '#type' => 'select',
            '#options' => [
                'un' => $this->t("United Nations' official languages"),
                'all' => $this->t('All @count languages', [
                    '@count' => count($predefined_languages),
                ]),
            ],
            '#default_value' => $this->configuration['language_list'],
            '#description' => $this->t('The list of languages to show in the language dropdown. The basic list will only show the <a href=":url">six official languages of the UN</a>. The extended list will show all @count languages that are available in Drupal.', [
                ':url' => 'https://www.un.org/en/sections/about-un/official-languages',
                '@count' => count($predefined_languages),
            ]),
        ];
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    public function validateConfigurationForm(array &$form, FormStateInterface $form_state) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
        $this->configuration['language_list'] = $form_state->getValue('language_list');
    }
    
    /**
     * {@inheritdoc}
     */
    public function defaultConfiguration() {
        return [
            'language_list' => 'un',
        ];
    }

}