<?php

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

use Drupal\Component\Utility\UrlHelper;
use Drupal\Component\Serialization\Json;
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\Template\Attribute;
use Drupal\Core\Url;
use Drupal\views\Form\ViewsForm;
use Drupal\views\Plugin\views\cache\CachePluginBase;
use Drupal\views\Plugin\views\query\QueryPluginBase;
use Drupal\views\Plugin\views\query\Sql;
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_theme().
 */
function media_library_theme() {
  return [
    'media__media_library' => [
      'base hook' => 'media',
    ],
  ];
}

/**
 * Implements hook_preprocess_view().
 *
 * Adds a link to add media above the view.
 */
function media_library_preprocess_views_view(&$variables) {
  $view = $variables['view'];
  if ($view->id() === 'media_library' && $view->current_display === 'widget') {
    $url = Url::fromRoute('media_library.upload');
    if ($url->access()) {
      $url->setOption('query', \Drupal::request()->query->all());
      $variables['header']['add_media'] = [
        '#type' => 'link',
        '#title' => t('Add media'),
        '#url' => $url,
        '#attributes' => [
          'class' => ['button', 'button-action', 'button--primary', 'use-ajax'],
          'data-dialog-type' => 'modal',
          'data-dialog-options' => Json::encode([
            'dialogClass' => 'media-library-widget-modal',
            'height' => '75%',
            'width' => '75%',
            'title' => t('Add media'),
          ]),
        ],
      ];
    }
  }
}

/**
 * Implements hook_views_post_render().
 */
function media_library_views_post_render(ViewExecutable $view, &$output, CachePluginBase $cache) {
  if ($view->id() === 'media_library') {
    $output['#attached']['library'][] = 'media_library/view';
    if ($view->current_display === 'widget') {
      $query = array_intersect_key(\Drupal::request()->query->all(), array_flip([
        'media_library_widget_id',
        'media_library_allowed_types',
        'media_library_remaining',
      ]));
      // If the current query contains any parameters we use to contextually
      // filter the view, ensure they persist across AJAX rebuilds.
      // The ajax_path is shared for all AJAX views on the page, but our query
      // parameters are prefixed and should not interfere with any other views.
      // @todo Rework or remove this in https://www.drupal.org/node/2983451
      if (!empty($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);
        if (isset($query['media_library_remaining'])) {
          $output['#attached']['drupalSettings']['media_library']['selection_remaining'] = (int) $query['media_library_remaining'];
        }
      }
    }
  }
}

/**
 * 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' && $form['#id'] === 'views-exposed-form-media-library-widget') {
    $form['#after_build'][] = '_media_library_views_form_media_library_after_build';
  }
}

/**
 * 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;
}

/**
 * Implements hook_views_query_alter().
 *
 * Alters the widget view's query to only show media that can be selected,
 * based on what types are allowed in the field settings.
 *
 * @todo Remove in https://www.drupal.org/node/2983454
 */
function media_library_views_query_alter(ViewExecutable $view, QueryPluginBase $query) {
  if ($query instanceof Sql && $view->id() === 'media_library' && $view->current_display === 'widget') {
    $types = _media_library_get_allowed_types();
    if ($types) {
      $entity_type = \Drupal::entityTypeManager()->getDefinition('media');
      $group = $query->setWhereGroup();
      $query->addWhere($group, $entity_type->getDataTable() . '.' . $entity_type->getKey('bundle'), $types, 'in');
    }
  }
}

/**
 * Implements hook_form_FORM_ID_alter().
 *
 * Limits the types available in the exposed filter to avoid users trying to
 * filter by a type that is un-selectable.
 *
 * @see media_library_views_query_alter()
 *
 * @todo Remove in https://www.drupal.org/node/2983454
 */
function media_library_form_views_exposed_form_alter(array &$form, FormStateInterface $form_state) {
  if (isset($form['#id']) && $form['#id'] === 'views-exposed-form-media-library-widget') {
    $types = _media_library_get_allowed_types();
    if ($types && isset($form['type']['#options'])) {
      $keys = array_flip($types);
      // Ensure that the default value (by default "All") persists.
      if (isset($form['type']['#default_value'])) {
        $keys[$form['type']['#default_value']] = TRUE;
      }
      $form['type']['#options'] = array_intersect_key($form['type']['#options'], $keys);
    }
  }
}

/**
 * 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]);
    }
  }
}

/**
 * Determines what types are allowed based on the current request.
 *
 * @return array
 *   An array of allowed types.
 */
function _media_library_get_allowed_types() {
  $types = \Drupal::request()->query->get('media_library_allowed_types');
  if ($types && is_array($types)) {
    return array_filter($types, 'is_string');
  }
  return [];
}