<?php

/**
 * @file
 */

use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Entity\Sql\SqlContentEntityStorage;
use Drupal\Core\Render\Element;
use Drupal\taxonomy\Entity\Term;

/**
 * Implements hook_theme_suggestions_HOOK().
 */
function taxonomy_theme_suggestions_taxonomy_term(array $variables): array {
  $suggestions = [];

  /** @var \Drupal\taxonomy\TermInterface $term */
  $term = $variables['elements']['#taxonomy_term'];

  $suggestions[] = 'taxonomy_term__' . $term->bundle();
  $suggestions[] = 'taxonomy_term__' . $term->id();

  return $suggestions;
}

/**
 * Prepares variables for taxonomy term templates.
 *
 * Default template: taxonomy-term.html.twig.
 *
 * By default this function performs special preprocessing to move the name
 * base field out of the elements array into a separate variable. This
 * preprocessing is skipped if:
 * - a module makes the field's display configurable via the field UI by means
 *   of BaseFieldDefinition::setDisplayConfigurable()
 * - AND the additional entity type property
 *   'enable_base_field_custom_preprocess_skipping' has been set using
 *   hook_entity_type_build().
 *
 * @param array $variables
 *   An associative array containing:
 *   - elements: An associative array containing the taxonomy term and any
 *     fields attached to the term. Properties used:
 *     - #taxonomy_term: A \Drupal\taxonomy\TermInterface object.
 *     - #view_mode: The current view mode for this taxonomy term, e.g.
 *       'full' or 'teaser'.
 *   - attributes: HTML attributes for the containing element.
 */
function template_preprocess_taxonomy_term(&$variables): void {
  $variables['view_mode'] = $variables['elements']['#view_mode'];
  $variables['term'] = $variables['elements']['#taxonomy_term'];
  /** @var \Drupal\taxonomy\TermInterface $term */
  $term = $variables['term'];

  $variables['url'] = !$term->isNew() ? $term->toUrl()->toString() : NULL;

  // Make name field available separately.  Skip this custom preprocessing if
  // the field display is configurable and skipping has been enabled.
  // @todo https://www.drupal.org/project/drupal/issues/3015623
  //   Eventually delete this code and matching template lines. Using
  //   $variables['content'] is more flexible and consistent.
  $skip_custom_preprocessing = $term->getEntityType()->get('enable_base_field_custom_preprocess_skipping');
  if (!$skip_custom_preprocessing || !$term->getFieldDefinition('name')->isDisplayConfigurable('view')) {
    // We use name here because that is what appears in the UI.
    $variables['name'] = $variables['elements']['name'];
    unset($variables['elements']['name']);
  }

  $variables['page'] = $variables['view_mode'] == 'full' && taxonomy_term_is_page($term);

  // Helpful $content variable for templates.
  $variables['content'] = [];
  foreach (Element::children($variables['elements']) as $key) {
    $variables['content'][$key] = $variables['elements'][$key];
  }
}

/**
 * Returns whether the current page is the page of the passed-in term.
 *
 * @param \Drupal\taxonomy\Entity\Term $term
 *   A taxonomy term entity.
 */
function taxonomy_term_is_page(Term $term) {
  if (\Drupal::routeMatch()->getRouteName() == 'entity.taxonomy_term.canonical' && $page_term_id = \Drupal::routeMatch()->getRawParameter('taxonomy_term')) {
    return $page_term_id == $term->id();
  }
  return FALSE;
}

/**
 * @addtogroup taxonomy_index
 * @{
 */

/**
 * Builds and inserts taxonomy index entries for a given node.
 *
 * The index lists all terms that are related to a given node entity, and is
 * therefore maintained at the entity level.
 *
 * @param \Drupal\node\NodeInterface $node
 *   The node entity.
 */
function taxonomy_build_node_index($node): void {
  // We maintain a denormalized table of term/node relationships, containing
  // only data for current, published nodes.
  if (!\Drupal::config('taxonomy.settings')->get('maintain_index_table') || !(\Drupal::entityTypeManager()->getStorage('node') instanceof SqlContentEntityStorage)) {
    return;
  }

  $status = $node->isPublished();
  $sticky = (int) $node->isSticky();
  // We only maintain the taxonomy index for published nodes.
  if ($status && $node->isDefaultRevision()) {
    // Collect a unique list of all the term IDs from all node fields.
    $tid_all = [];
    $entity_reference_class = 'Drupal\Core\Field\Plugin\Field\FieldType\EntityReferenceItem';
    foreach ($node->getFieldDefinitions() as $field) {
      $field_name = $field->getName();
      $class = $field->getItemDefinition()->getClass();
      $is_entity_reference_class = ($class === $entity_reference_class) || is_subclass_of($class, $entity_reference_class);
      if ($is_entity_reference_class && $field->getSetting('target_type') == 'taxonomy_term') {
        foreach ($node->getTranslationLanguages() as $language) {
          foreach ($node->getTranslation($language->getId())->$field_name as $item) {
            if (!$item->isEmpty()) {
              $tid_all[$item->target_id] = $item->target_id;
            }
          }
        }
      }
    }
    // Insert index entries for all the node's terms.
    if (!empty($tid_all)) {
      $connection = \Drupal::database();
      foreach ($tid_all as $tid) {
        $connection->merge('taxonomy_index')
          ->keys(['nid' => $node->id(), 'tid' => $tid, 'status' => $node->isPublished()])
          ->fields(['sticky' => $sticky, 'created' => $node->getCreatedTime()])
          ->execute();
      }
    }
  }
}

/**
 * Deletes taxonomy index entries for a given node.
 *
 * @param \Drupal\Core\Entity\EntityInterface $node
 *   The node entity.
 */
function taxonomy_delete_node_index(EntityInterface $node): void {
  if (\Drupal::config('taxonomy.settings')->get('maintain_index_table')) {
    \Drupal::database()->delete('taxonomy_index')->condition('nid', $node->id())->execute();
  }
}

/**
 * @} End of "addtogroup taxonomy_index".
 */