<?php

namespace Drupal\taxonomy\Entity;

use Drupal\Core\Entity\Attribute\ContentEntityType;
use Drupal\Core\Entity\EntityListBuilder;
use Drupal\Core\Entity\EntityViewBuilder;
use Drupal\Core\Entity\Routing\RevisionHtmlRouteProvider;
use Drupal\Core\Entity\Form\RevisionRevertForm;
use Drupal\Core\Entity\Form\RevisionDeleteForm;
use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\Core\Entity\EditorialContentEntityBase;
use Drupal\Core\Entity\EntityStorageInterface;
use Drupal\Core\Entity\EntityTypeInterface;
use Drupal\Core\Field\BaseFieldDefinition;
use Drupal\taxonomy\Form\TermDeleteForm;
use Drupal\taxonomy\TermAccessControlHandler;
use Drupal\taxonomy\TermForm;
use Drupal\taxonomy\TermInterface;
use Drupal\taxonomy\TermStorage;
use Drupal\taxonomy\TermStorageSchema;
use Drupal\taxonomy\TermTranslationHandler;
use Drupal\taxonomy\TermViewsData;
use Drupal\user\StatusItem;

/**
 * Defines the taxonomy term entity.
 */
#[ContentEntityType(
  id: 'taxonomy_term',
  label: new TranslatableMarkup('Taxonomy term'),
  label_collection: new TranslatableMarkup('Taxonomy terms'),
  label_singular: new TranslatableMarkup('taxonomy term'),
  label_plural: new TranslatableMarkup('taxonomy terms'),
  entity_keys: [
    'id' => 'tid',
    'revision' => 'revision_id',
    'bundle' => 'vid',
    'label' => 'name',
    'langcode' => 'langcode',
    'uuid' => 'uuid',
    'published' => 'status',
  ],
  handlers: [
    'storage' => TermStorage::class,
    'storage_schema' => TermStorageSchema::class,
    'view_builder' => EntityViewBuilder::class,
    'list_builder' => EntityListBuilder::class,
    'access' => TermAccessControlHandler::class,
    'views_data' => TermViewsData::class,
    'form' => [
      'default' => TermForm::class,
      'delete' => TermDeleteForm::class,
      'revision-delete' => RevisionDeleteForm::class,
      'revision-revert' => RevisionRevertForm::class,
    ],
    'route_provider' => [
      'revision' => RevisionHtmlRouteProvider::class,
    ],
    'translation' => TermTranslationHandler::class,
  ],
  links: [
    'canonical' => '/taxonomy/term/{taxonomy_term}',
    'delete-form' => '/taxonomy/term/{taxonomy_term}/delete',
    'edit-form' => '/taxonomy/term/{taxonomy_term}/edit',
    'create' => '/taxonomy/term',
    'revision' => '/taxonomy/term/{taxonomy_term}/revision/{taxonomy_term_revision}/view',
    'revision-delete-form' => '/taxonomy/term/{taxonomy_term}/revision/{taxonomy_term_revision}/delete',
    'revision-revert-form' => '/taxonomy/term/{taxonomy_term}/revision/{taxonomy_term_revision}/revert',
    'version-history' => '/taxonomy/term/{taxonomy_term}/revisions',
  ],
  collection_permission: 'access taxonomy overview',
  permission_granularity: 'bundle',
  bundle_entity_type: 'taxonomy_vocabulary',
  bundle_label: new TranslatableMarkup('Vocabulary'),
  base_table: 'taxonomy_term_data',
  data_table: 'taxonomy_term_field_data',
  revision_table: 'taxonomy_term_revision',
  revision_data_table: 'taxonomy_term_field_revision',
  translatable: TRUE,
  show_revision_ui: TRUE,
  label_count: [
    'singular' => '@count taxonomy term',
    'plural' => '@count taxonomy terms',
  ],
  field_ui_base_route: 'entity.taxonomy_vocabulary.overview_form',
  common_reference_target: TRUE,
  constraints: [
    'TaxonomyHierarchy' => [],
  ],
  revision_metadata_keys: [
    'revision_user' => 'revision_user',
    'revision_created' => 'revision_created',
    'revision_log_message' => 'revision_log_message',
  ],
)]
class Term extends EditorialContentEntityBase implements TermInterface {

  /**
   * {@inheritdoc}
   */
  public static function postDelete(EntityStorageInterface $storage, array $entities) {
    parent::postDelete($storage, $entities);

    // See if any of the term's children are about to be become orphans.
    $orphans = [];
    /** @var \Drupal\taxonomy\TermInterface $term */
    foreach ($entities as $tid => $term) {
      if ($children = $storage->getChildren($term)) {
        /** @var \Drupal\taxonomy\TermInterface $child */
        foreach ($children as $child) {
          $parent = $child->get('parent');
          // Update child parents item list.
          $parent->filter(function ($item) use ($tid) {
            return $item->target_id != $tid;
          });

          // If the term has multiple parents, we don't delete it.
          if ($parent->count()) {
            $child->save();
          }
          else {
            $orphans[] = $child;
          }
        }
      }
    }

    if (!empty($orphans)) {
      $storage->delete($orphans);
    }
  }

  /**
   * {@inheritdoc}
   */
  public function preSave(EntityStorageInterface $storage) {
    parent::preSave($storage);
    // Terms with no parents are mandatory children of <root>.
    if (!$this->get('parent')->count()) {
      $this->parent->target_id = 0;
    }
  }

  /**
   * {@inheritdoc}
   */
  public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
    /** @var \Drupal\Core\Field\BaseFieldDefinition[] $fields */
    $fields = parent::baseFieldDefinitions($entity_type);

    // @todo Remove the usage of StatusItem in
    //   https://www.drupal.org/project/drupal/issues/2936864.
    $fields['status']->getItemDefinition()->setClass(StatusItem::class);

    $fields['tid']->setLabel(t('Term ID'))
      ->setDescription(t('The term ID.'));

    $fields['uuid']->setDescription(t('The term UUID.'));

    $fields['status']
      ->setDisplayOptions('form', [
        'type' => 'boolean_checkbox',
        'settings' => [
          'display_label' => TRUE,
        ],
        'weight' => 100,
      ])
      ->setDisplayConfigurable('form', TRUE);

    $fields['vid']->setLabel(t('Vocabulary'))
      ->setDescription(t('The vocabulary to which the term is assigned.'));

    $fields['langcode']->setDescription(t('The term language code.'));

    $fields['name'] = BaseFieldDefinition::create('string')
      ->setLabel(t('Name'))
      ->setTranslatable(TRUE)
      ->setRevisionable(TRUE)
      ->setRequired(TRUE)
      ->setSetting('max_length', 255)
      ->setDisplayOptions('view', [
        'label' => 'hidden',
        'type' => 'string',
        'weight' => -5,
      ])
      ->setDisplayOptions('form', [
        'type' => 'string_textfield',
        'weight' => -5,
      ])
      ->setDisplayConfigurable('form', TRUE);

    $fields['description'] = BaseFieldDefinition::create('text_long')
      ->setLabel(t('Description'))
      ->setTranslatable(TRUE)
      ->setRevisionable(TRUE)
      ->setDisplayOptions('view', [
        'label' => 'hidden',
        'type' => 'text_default',
        'weight' => 0,
      ])
      ->setDisplayConfigurable('view', TRUE)
      ->setDisplayOptions('form', [
        'type' => 'text_textfield',
        'weight' => 0,
      ])
      ->setDisplayConfigurable('form', TRUE);

    $fields['weight'] = BaseFieldDefinition::create('integer')
      ->setLabel(t('Weight'))
      ->setDescription(t('The weight of this term in relation to other terms.'))
      ->setDefaultValue(0);

    $fields['parent'] = BaseFieldDefinition::create('entity_reference')
      ->setLabel(t('Term Parents'))
      ->setDescription(t('The parents of this term.'))
      ->setSetting('target_type', 'taxonomy_term')
      ->setCardinality(BaseFieldDefinition::CARDINALITY_UNLIMITED);

    $fields['changed'] = BaseFieldDefinition::create('changed')
      ->setLabel(t('Changed'))
      ->setDescription(t('The time that the term was last edited.'))
      ->setTranslatable(TRUE)
      ->setRevisionable(TRUE);

    return $fields;
  }

  /**
   * {@inheritdoc}
   */
  public static function bundleFieldDefinitions(EntityTypeInterface $entity_type, $bundle, array $base_field_definitions) {
    // Only terms in the same bundle can be a parent.
    $fields['parent'] = clone $base_field_definitions['parent'];
    $fields['parent']->setSetting('handler_settings', ['target_bundles' => [$bundle => $bundle]]);
    return $fields;
  }

  /**
   * {@inheritdoc}
   */
  public function getDescription() {
    return $this->get('description')->value;
  }

  /**
   * {@inheritdoc}
   */
  public function setDescription($description) {
    $this->set('description', $description);
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function getFormat() {
    return $this->get('description')->format;
  }

  /**
   * {@inheritdoc}
   */
  public function setFormat($format) {
    $this->get('description')->format = $format;
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function getName() {
    return $this->label() ?? '';
  }

  /**
   * {@inheritdoc}
   */
  public function setName($name) {
    $this->set('name', $name);
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function getWeight() {
    return (int) $this->get('weight')->value;
  }

  /**
   * {@inheritdoc}
   */
  public function setWeight($weight) {
    $this->set('weight', $weight);
    return $this;
  }

}