class ViewsHooks

readonly class ViewsHooks {
  
  /**
   * Implements hook_views_ui_display_tab_alter().
   */
  public function viewsUiDisplayTabAlter(array &$element) : void {
    // We process the dropbutton-like element on views edit form's
    // display settings top section.
    //
    // That element should be a regular Dropbutton.
    //
    // After that the reported issue is fixed and the element is rendered with
    // the Dropbutton type, we just have to set it's '#dropbutton_type' to
    // 'extrasmall'.
    //
    // @todo Revisit after https://www.drupal.org/node/3057577 is fixed.
    $dummy_dropbutton =& $element['details']['top']['actions'];
    if ($dummy_dropbutton) {
      $child_keys = Element::children($dummy_dropbutton);
      $prefix_regex = '/(<.*class\\s*= *["\']?)([^"\']*)(.*)/i';
      $child_count = 0;
      foreach ($child_keys as $key) {
        if (in_array($key, [
          'prefix',
          'suffix',
        ])) {
          continue;
        }
        $nested_child_keys = Element::children($dummy_dropbutton[$key], TRUE);
        if (!empty($nested_child_keys)) {
          foreach ($nested_child_keys as $nested_key) {
            $child_count++;
            $prefix = $dummy_dropbutton[$key][$nested_key]['#prefix'];
            $dummy_dropbutton[$key][$nested_key]['#prefix'] = preg_replace($prefix_regex, '$1$2 dropbutton__item$3', $prefix);
          }
        }
        else {
          $child_count++;
          $prefix = $dummy_dropbutton[$key]['#prefix'];
          $dummy_dropbutton[$key]['#prefix'] = preg_replace($prefix_regex, '$1$2 dropbutton__item$3', $prefix);
        }
      }
      if (!empty($dummy_dropbutton['prefix']) && !empty($dummy_dropbutton['prefix']['#markup'])) {
        $classes = 'dropbutton--extrasmall ';
        $classes .= $child_count > 1 ? 'dropbutton--multiple' : 'dropbutton--single';
        $prefix = $dummy_dropbutton['prefix']['#markup'];
        $dummy_dropbutton['prefix']['#markup'] = preg_replace($prefix_regex, '$1$2 ' . $classes . '$3', $prefix);
      }
    }
    // If the top details have both actions and title, the `actions` weights
    // need to be adjusted so the DOM order matches the order of appearance.
    if (isset($element['details']['top']['actions'], $element['details']['top']['display_title'])) {
      $top =& $element['details']['top'];
      $top['actions']['#weight'] = 10;
      $top['#attributes']['class'] = array_diff($top['#attributes']['class'], [
        'clearfix',
      ]);
    }
  }
  
  /**
   * Implements hook_views_ui_display_top_alter().
   */
  public function viewsUiDisplayTopAlter(array &$element) : void {
    // @todo Remove this after https://www.drupal.org/node/3051605 has been
    //   solved.
    $element['tabs']['#prefix'] = preg_replace('/(class="(.+\\s)?)tabs(\\s.+"|")/', '$1views-tabs$3', $element['tabs']['#prefix']);
    $element['tabs']['#prefix'] = preg_replace('/(class="(.+\\s)?)secondary(\\s.+"|")/', '$1views-tabs--secondary$3', $element['tabs']['#prefix']);
    foreach (Element::children($element['tabs']) as $tab) {
      $element['tabs'][$tab]['#theme'] = 'menu_local_task__views_ui';
    }
    // Change top extra actions to use the small dropbutton variant.
    // @todo Revisit after https://www.drupal.org/node/3057581 is added.
    if (!empty($element['extra_actions'])) {
      $element['extra_actions']['#dropbutton_type'] = 'small';
    }
    // Add a class to each item in the add display dropdown so they can be
    // styled with a single selector.
    if (isset($element['add_display'])) {
      foreach ($element['add_display'] as &$display_item) {
        if (isset($display_item['#type']) && in_array($display_item['#type'], [
          'submit',
          'button',
        ], TRUE)) {
          $display_item['#attributes']['class'][] = 'views-tabs__action-list-button';
        }
      }
      unset($display_item);
    }
    // Rearrange top bar contents so floats aren't necessary for positioning.
    if (isset($element['extra_actions'], $element['add_display'])) {
      $element['extra_actions']['#weight'] = 10;
      $element['extra_actions']['#theme_wrappers'] = [
        'container' => [
          '#attributes' => [
            'class' => [
              'views-display-top__extra-actions-wrapper',
            ],
          ],
        ],
      ];
      $element['#attributes']['class'] = array_diff($element['#attributes']['class'], [
        'clearfix',
      ]);
    }
  }
  
  /**
   * Implements hook_views_pre_render().
   */
  public function preRender(ViewExecutable $view) : void {
    $add_classes = static function (&$option, array $classes_to_add) {
      $classes = preg_split('/\\s+/', $option);
      $classes = array_filter($classes);
      $classes = array_merge($classes, $classes_to_add);
      $option = implode(' ', array_unique($classes));
    };
    if ($view->id() === 'media_library') {
      if ($view->display_handler->options['defaults']['css_class']) {
        $add_classes($view->displayHandlers
          ->get('default')->options['css_class'], [
          'media-library-view',
        ]);
      }
      else {
        $add_classes($view->display_handler->options['css_class'], [
          'media-library-view',
        ]);
      }
      if ($view->current_display === 'page') {
        if (array_key_exists('media_bulk_form', $view->field)) {
          $add_classes($view->field['media_bulk_form']->options['element_class'], [
            'media-library-item__click-to-select-checkbox',
          ]);
        }
        if (array_key_exists('rendered_entity', $view->field)) {
          $add_classes($view->field['rendered_entity']->options['element_class'], [
            'media-library-item__content',
          ]);
        }
        if (array_key_exists('edit_media', $view->field)) {
          $add_classes($view->field['edit_media']->options['alter']['link_class'], [
            'media-library-item__edit',
          ]);
          $add_classes($view->field['edit_media']->options['alter']['link_class'], [
            'icon-link',
          ]);
        }
        if (array_key_exists('delete_media', $view->field)) {
          $add_classes($view->field['delete_media']->options['alter']['link_class'], [
            'media-library-item__remove',
          ]);
          $add_classes($view->field['delete_media']->options['alter']['link_class'], [
            'icon-link',
          ]);
        }
      }
      elseif (str_starts_with($view->current_display, 'widget')) {
        if (array_key_exists('rendered_entity', $view->field)) {
          $add_classes($view->field['rendered_entity']->options['element_class'], [
            'media-library-item__content',
          ]);
        }
        if (array_key_exists('media_library_select_form', $view->field)) {
          $add_classes($view->field['media_library_select_form']->options['element_wrapper_class'], [
            'media-library-item__click-to-select-checkbox',
          ]);
        }
        if ($view->display_handler->options['defaults']['css_class']) {
          $add_classes($view->displayHandlers
            ->get('default')->options['css_class'], [
            'media-library-view--widget',
          ]);
        }
        else {
          $add_classes($view->display_handler->options['css_class'], [
            'media-library-view--widget',
          ]);
        }
      }
    }
  }

}