class LanguageThemeHooks

class LanguageThemeHooks {
  use StringTranslationTrait;
  
  /**
   * Implements hook_theme().
   */
  public function theme() : array {
    return [
      'language_negotiation_configure_form' => [
        'render element' => 'form',
        'initial preprocess' => static::class . ':preprocessLanguageNegotiationConfigureForm',
      ],
      'language_content_settings_table' => [
        'render element' => 'element',
        'initial preprocess' => static::class . ':preprocessLanguageContentSettingsTable',
      ],
    ];
  }
  
  /**
   * Prepares variables for language negotiation configuration form.
   *
   * Default template: language-content-configuration-form.html.twig.
   *
   * @param array $variables
   *   An associative array containing:
   *   - form: A render element representing the form.
   */
  public function preprocessLanguageNegotiationConfigureForm(array &$variables) : void {
    $form =& $variables['form'];
    $variables['language_types'] = [];
    foreach ($form['#language_types'] as $type) {
      $header = [
        $this->t('Detection method'),
        $this->t('Description'),
        $this->t('Enabled'),
        $this->t('Weight'),
      ];
      // If there is at least one operation enabled show the operation column.
      if ($form[$type]['#show_operations']) {
        $header[] = $this->t('Operations');
      }
      $table = [
        '#type' => 'table',
        '#header' => $header,
        '#attributes' => [
          'id' => 'language-negotiation-methods-' . $type,
        ],
        '#tabledrag' => [
          [
            'action' => 'order',
            'relationship' => 'sibling',
            'group' => 'language-method-weight-' . $type,
          ],
        ],
      ];
      foreach ($form[$type]['title'] as $id => $element) {
        // Do not take form control structures.
        if (is_array($element) && Element::child($id)) {
          $table[$id]['#attributes']['class'][] = 'draggable';
          $table[$id]['#weight'] = $element['#weight'];
          $table[$id]['title'] = [
            '#prefix' => '<strong>',
            $form[$type]['title'][$id],
            '#suffix' => '</strong>',
          ];
          $table[$id]['description'] = $form[$type]['description'][$id];
          $table[$id]['enabled'] = $form[$type]['enabled'][$id];
          $table[$id]['weight'] = $form[$type]['weight'][$id];
          if ($form[$type]['#show_operations']) {
            $table[$id]['operation'] = $form[$type]['operation'][$id];
          }
          // Unset to prevent rendering along with children.
          unset($form[$type]['title'][$id]);
          unset($form[$type]['description'][$id]);
          unset($form[$type]['enabled'][$id]);
          unset($form[$type]['weight'][$id]);
          unset($form[$type]['operation'][$id]);
        }
      }
      // Unset configurable to prevent rendering twice with children.
      $configurable = $form[$type]['configurable'] ?? NULL;
      unset($form[$type]['configurable']);
      $variables['language_types'][] = [
        'type' => $type,
        'title' => $form[$type]['#title'],
        'description' => $form[$type]['#description'],
        'configurable' => $configurable,
        'table' => $table,
        'children' => $form[$type],
        'attributes' => new Attribute(),
      ];
      // Prevent the type from rendering with the remaining form child elements.
      unset($form[$type]);
    }
    $variables['children'] = $form;
  }
  
  /**
   * Prepares variables for language content settings table templates.
   *
   * Default template: language-content-settings-table.html.twig.
   *
   * @param array $variables
   *   An associative array containing:
   *   - element: An associative array containing the properties of the element.
   *     Properties used: #bundle_label, #title.
   */
  public function preprocessLanguageContentSettingsTable(array &$variables) : void {
    // Add a render element representing the bundle language settings table.
    $element = $variables['element'];
    $header = [
      [
        'data' => $element['#bundle_label'],
        'class' => [
          'bundle',
        ],
      ],
      [
        'data' => $this->t('Configuration'),
        'class' => [
          'operations',
        ],
      ],
    ];
    $rows = [];
    foreach (Element::children($element) as $bundle) {
      $rows[$bundle] = [
        'data' => [
          [
            'data' => [
              '#prefix' => '<label>',
              '#suffix' => '</label>',
              '#plain_text' => $element[$bundle]['settings']['#label'],
            ],
            'class' => [
              'bundle',
            ],
          ],
          [
            'data' => $element[$bundle]['settings'],
            'class' => [
              'operations',
            ],
          ],
        ],
        'class' => [
          'bundle-settings',
        ],
      ];
    }
    $variables['title'] = $element['#title'];
    $variables['build'] = [
      '#header' => $header,
      '#rows' => $rows,
      '#type' => 'table',
    ];
  }
  
  /**
   * Implements hook_preprocess_HOOK() for block templates.
   */
  public function preprocessBlock(&$variables) : void {
    if ($variables['configuration']['provider'] == 'language') {
      $variables['attributes']['role'] = 'navigation';
    }
  }

}