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<?php

/**
 * @file
 * Contains hook implementations for the media_library module.
 */

use Drupal\Component\Utility\UrlHelper;
use Drupal\Core\Access\AccessResult;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Entity\Entity\EntityFormDisplay;
use Drupal\Core\Entity\Entity\EntityViewDisplay;
use Drupal\Core\Field\Plugin\Field\FieldType\EntityReferenceItem;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Render\Element;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\Session\AccountInterface;
use Drupal\Core\Template\Attribute;
use Drupal\image\Entity\ImageStyle;
use Drupal\image\Plugin\Field\FieldType\ImageItem;
use Drupal\media\MediaTypeForm;
use Drupal\media\MediaTypeInterface;
use Drupal\media_library\Form\FileUploadForm;
use Drupal\media_library\Form\OEmbedForm;
use Drupal\media_library\MediaLibraryState;
use Drupal\views\Form\ViewsForm;
use Drupal\views\Plugin\views\cache\CachePluginBase;
use Drupal\views\ViewExecutable;

/**
 * Implements hook_help().
 *
 * @todo Update in https://www.drupal.org/project/drupal/issues/2964789
 */
function media_library_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    case 'help.page.media_library':
      $output = '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('The Media library module overrides the /admin/content/media view to provide a rich visual interface for performing administrative operations on media. For more information, see the <a href=":media">online documentation for the Media library module</a>.', [':media' => 'https://www.drupal.org/docs/8/core/modules/media']) . '</p>';
      return $output;
  }
}

/**
 * Implements hook_media_source_info_alter().
 */
function media_library_media_source_info_alter(array &$sources) {
  $sources['audio_file']['forms']['media_library_add'] = FileUploadForm::class;
  $sources['file']['forms']['media_library_add'] = FileUploadForm::class;
  $sources['image']['forms']['media_library_add'] = FileUploadForm::class;
  $sources['video_file']['forms']['media_library_add'] = FileUploadForm::class;
  $sources['oembed:video']['forms']['media_library_add'] = OEmbedForm::class;
}

/**
 * Implements hook_theme().
 */
function media_library_theme() {
  return [
    'media__media_library' => [
      'base hook' => 'media',
    ],
  ];
}

/**
 * Implements hook_views_post_render().
 */
function media_library_views_post_render(ViewExecutable $view, &$output, CachePluginBase $cache) {
  if ($view->id() === 'media_library') {
    $output['#attached']['library'][] = 'media_library/view';
    if (strpos($view->current_display, 'widget') === 0) {
      $query = MediaLibraryState::fromRequest($view->getRequest())->all();
      // If the current query contains any parameters we use to contextually
      // filter the view, ensure they persist across AJAX rebuilds.
      // The ajax_path is shared for all AJAX views on the page, but our query
      // parameters are prefixed and should not interfere with any other views.
      // @todo Rework or remove this in https://www.drupal.org/node/2983451
      if (!empty($query)) {
        $ajax_path = &$output['#attached']['drupalSettings']['views']['ajax_path'];
        $parsed_url = UrlHelper::parse($ajax_path);
        $query = array_merge($query, $parsed_url['query']);
        $ajax_path = $parsed_url['path'] . '?' . UrlHelper::buildQuery($query);
      }
    }
  }
}

/**
 * Implements hook_preprocess_media().
 */
function media_library_preprocess_media(&$variables) {
  if ($variables['view_mode'] === 'media_library') {
    /** @var \Drupal\media\MediaInterface $media */
    $media = $variables['media'];
    $variables['#cache']['contexts'][] = 'user.permissions';
    $rel = $media->access('edit') ? 'edit-form' : 'canonical';
    $variables['url'] = $media->toUrl($rel, [
      'language' => $media->language(),
    ]);
    $variables['preview_attributes'] = new Attribute();
    $variables['preview_attributes']->addClass('media-library-item__preview', 'js-media-library-item-preview', 'js-click-to-select-trigger');
    $variables['metadata_attributes'] = new Attribute();
    $variables['metadata_attributes']->addClass('media-library-item__attributes');
    $variables['status'] = $media->isPublished();
  }
}

/**
 * Alter the bulk form to add a more accessible label.
 *
 * @param array $form
 *   An associative array containing the structure of the form.
 * @param \Drupal\Core\Form\FormStateInterface $form_state
 *   The current state of the form.
 *
 * @todo Remove in https://www.drupal.org/node/2983454
 */
function media_library_form_views_form_media_library_page_alter(array &$form, FormStateInterface $form_state) {
  if (isset($form['media_bulk_form']) && isset($form['output'])) {
    /** @var \Drupal\views\ViewExecutable $view */
    $view = $form['output'][0]['#view'];
    foreach (Element::getVisibleChildren($form['media_bulk_form']) as $key) {
      if (isset($view->result[$key])) {
        $media = $view->field['media_bulk_form']->getEntity($view->result[$key]);
        $form['media_bulk_form'][$key]['#title'] = t('Select @label', [
          '@label' => $media->label(),
        ]);
      }
    }
  }
}

/**
 * Implements hook_form_alter().
 */
function media_library_form_alter(array &$form, FormStateInterface $form_state, $form_id) {
  $form_object = $form_state->getFormObject();
  if ($form_object instanceof ViewsForm && strpos($form_object->getBaseFormId(), 'views_form_media_library') === 0) {
    $form['#attributes']['class'][] = 'media-library-views-form';
    if (isset($form['header'])) {
      $form['header']['#attributes']['class'][] = 'media-library-views-form__header';
      $form['header']['media_bulk_form']['#attributes']['class'][] = 'media-library-views-form__bulk_form';
    }
  }

  // Add after build to fix media library views exposed filter's submit button.
  if ($form_id === 'views_exposed_form' && strpos($form['#id'], 'views-exposed-form-media-library-widget') === 0) {
    $form['#after_build'][] = '_media_library_views_form_media_library_after_build';
  }

  // Configures media_library displays when a type is submitted.
  if ($form_object instanceof MediaTypeForm) {
    $form['actions']['submit']['#submit'][] = '_media_library_media_type_form_submit';
  }
}

/**
 * After build callback for views form media library.
 */
function _media_library_views_form_media_library_after_build(array $form, FormStateInterface $form_state) {
  // Remove .form-actions from media library views exposed filter actions
  // and replace with .media-library-view--form-actions.
  //
  // This prevents the views exposed filter's 'Apply filter' submit button from
  // being moved into the dialog's buttons.
  // @see \Drupal\Core\Render\Element\Actions::processActions
  // @see Drupal.behaviors.dialog.prepareDialogButtons
  if (($key = array_search('form-actions', $form['actions']['#attributes']['class'])) !== FALSE) {
    unset($form['actions']['#attributes']['class'][$key]);
  }
  $form['actions']['#attributes']['class'][] = 'media-library-view--form-actions';
  return $form;
}

/**
 * Submit callback for media type form.
 */
function _media_library_media_type_form_submit(array &$form, FormStateInterface $form_state) {
  $form_object = $form_state->getFormObject();
  if ($form_object->getOperation() === 'add') {
    $type = $form_object->getEntity();
    $form_display_created = _media_library_configure_form_display($type);
    $view_display_created = _media_library_configure_view_display($type);
    if ($form_display_created || $view_display_created) {
      \Drupal::messenger()->addStatus(t('Media Library form and view displays have been created for the %type media type.', [
        '%type' => $type->label(),
      ]));
    }
  }
}

/**
 * Implements hook_field_ui_preconfigured_options_alter().
 */
function media_library_field_ui_preconfigured_options_alter(array &$options, $field_type) {
  // If the field is not an "entity_reference"-based field, bail out.
  $class = \Drupal::service('plugin.manager.field.field_type')->getPluginClass($field_type);
  if (!is_a($class, EntityReferenceItem::class, TRUE)) {
    return;
  }

  // Set the default field widget for media to be the Media library.
  if (!empty($options['media'])) {
    $options['media']['entity_form_display']['type'] = 'media_library_widget';
  }
}

/**
 * Implements hook_local_tasks_alter().
 *
 * Removes tasks for the Media library if the view display no longer exists.
 */
function media_library_local_tasks_alter(&$local_tasks) {
  /** @var \Symfony\Component\Routing\RouteCollection $route_collection */
  $route_collection = \Drupal::service('router')->getRouteCollection();
  foreach (['media_library.grid', 'media_library.table'] as $key) {
    if (isset($local_tasks[$key]) && !$route_collection->get($local_tasks[$key]['route_name'])) {
      unset($local_tasks[$key]);
    }
  }
}

/**
 * Implements hook_ENTITY_TYPE_access().
 */
function media_library_image_style_access(EntityInterface $entity, $operation, AccountInterface $account) {
  // Prevent the fallback 'media_library' image style from being deleted.
  // @todo: Lock the image style instead of preventing delete access.
  //   https://www.drupal.org/project/drupal/issues/2247293
  if ($operation === 'delete' && $entity->id() === 'media_library') {
    return AccessResult::forbidden();
  }
}

/**
 * Ensures that the given media type has a media_library form display.
 *
 * @param \Drupal\media\MediaTypeInterface $type
 *   The media type to configure.
 *
 * @return bool
 *   Whether a form display has been created or not.
 *
 * @throws \Drupal\Core\Entity\EntityStorageException
 */
function _media_library_configure_form_display(MediaTypeInterface $type) {
  $display = EntityFormDisplay::load('media.' . $type->id() . '.media_library');

  if ($display) {
    return FALSE;
  }

  $values = [
    'targetEntityType' => 'media',
    'bundle' => $type->id(),
    'mode' => 'media_library',
    'status' => TRUE,
  ];
  $display = EntityFormDisplay::create($values);
  // Remove all default components.
  foreach (array_keys($display->getComponents()) as $name) {
    $display->removeComponent($name);
  }
  // Expose the name field when it is not mapped.
  $field_map = $type->getFieldMap();
  if (empty($field_map['name'])) {
    $display->setComponent('name', [
      'type' => 'string_textfield',
      'settings' => [
        'size' => 60,
      ],
    ]);
  }
  // If the source field is an image field, expose it so that users can set alt
  // and title text.
  $source_field = $type->getSource()->getSourceFieldDefinition($type);
  if ($source_field->isDisplayConfigurable('form') && is_a($source_field->getItemDefinition()->getClass(), ImageItem::class, TRUE)) {
    $type->getSource()->prepareFormDisplay($type, $display);
  }
  return (bool) $display->save();
}

/**
 * Ensures that the given media type has a media_library view display.
 *
 * @param \Drupal\media\MediaTypeInterface $type
 *   The media type to configure.
 *
 * @return bool
 *   Whether a view display has been created or not.
 *
 * @throws \Drupal\Core\Entity\EntityStorageException
 */
function _media_library_configure_view_display(MediaTypeInterface $type) {
  $display = EntityViewDisplay::load('media.' . $type->id() . '.media_library');

  if ($display) {
    return FALSE;
  }

  $values = [
    'targetEntityType' => 'media',
    'bundle' => $type->id(),
    'mode' => 'media_library',
    'status' => TRUE,
  ];
  $display = EntityViewDisplay::create($values);
  // Remove all default components.
  foreach (array_keys($display->getComponents()) as $name) {
    $display->removeComponent($name);
  }

  // @todo: Remove dependency on 'medium' and 'thumbnail' image styles from
  //   media and media library modules.
  //   https://www.drupal.org/project/drupal/issues/3030437
  $image_style = ImageStyle::load('medium');

  // Expose the thumbnail component. If the medium image style doesn't exist,
  // use the fallback 'media_library' image style.
  $display->setComponent('thumbnail', [
    'type' => 'image',
    'label' => 'hidden',
    'settings' => [
      'image_style' => $image_style ? $image_style->id() : 'media_library',
      'image_link' => '',
    ],
  ]);
  return (bool) $display->save();
}