<?php

/**
 * @file
 * Test module for the entity API providing several entity types for testing.
 */

use Drupal\Core\Access\AccessResult;
use Drupal\Core\Entity\ContentEntityInterface;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Entity\FieldableEntityInterface;
use Drupal\Core\Entity\EntityTypeInterface;
use Drupal\Core\Field\BaseFieldDefinition;
use Drupal\Core\Field\FieldDefinitionInterface;
use Drupal\Core\Field\FieldItemListInterface;
use Drupal\Core\Field\FieldStorageDefinitionInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Session\AccountInterface;
use Drupal\Core\Entity\Entity\EntityFormDisplay;
use Drupal\Core\Url;

/**
 * Filter that limits test entity list to revisable ones.
 */
const ENTITY_TEST_TYPES_REVISABLE = 1;

/**
 * Filter that limits test entity list to multilingual ones.
 */
const ENTITY_TEST_TYPES_MULTILINGUAL = 2;

/**
 * Filter that limits test entity list to routeable ones.
 */
const ENTITY_TEST_TYPES_ROUTING = 3;

/**
 * Returns a list of test entity types.
 *
 * The returned entity types are one for each available entity storage type:
 * - The plain entity_test type supports neither revisions nor multilingual
 *   properties.
 * - The entity_test_mul type supports multilingual properties.
 * - The entity_test_rev type supports revisions.
 * - The entity_test_mulrev type supports both revisions and multilingual
 *   properties.
 *
 * @param int $filter
 *   Either ENTITY_TEST_TYPES_REVISABLE to only return revisable entity types or
 *   ENTITY_TEST_TYPES_MULTILINGUAL to only return multilingual ones. Defaults
 *   to NULL, which returns all.
 *
 * @return array
 *   List with entity_types.
 */
function entity_test_entity_types($filter = NULL) {
  $types = [];
  if ($filter === NULL || $filter === ENTITY_TEST_TYPES_ROUTING) {
    $types[] = 'entity_test';
  }
  if ($filter != ENTITY_TEST_TYPES_REVISABLE) {
    $types[] = 'entity_test_mul';
    $types[] = 'entity_test_mul_langcode_key';
    $types[] = 'entity_test_mul_changed';
  }
  if ($filter != ENTITY_TEST_TYPES_MULTILINGUAL) {
    $types[] = 'entity_test_rev';
  }
  if ($filter === ENTITY_TEST_TYPES_ROUTING) {
    $types[] = 'entity_test_base_field_display';
    $types[] = 'entity_test_string_id';
    $types[] = 'entity_test_no_id';
  }
  $types[] = 'entity_test_mulrev';
  $types[] = 'entity_test_mulrev_changed';

  return array_combine($types, $types);
}

/**
 * Implements hook_entity_type_alter().
 */
function entity_test_entity_type_alter(array &$entity_types) {
  $state = \Drupal::state();

  /** @var $entity_types \Drupal\Core\Entity\EntityTypeInterface[] */
  foreach (entity_test_entity_types() as $entity_type) {
    // Optionally specify a translation handler for testing translations.
    if ($state->get('entity_test.translation')) {
      $translation = $entity_types[$entity_type]->get('translation');
      $translation[$entity_type] = TRUE;
      $entity_types[$entity_type]->set('translation', $translation);
    }
  }

  // Allow entity_test_with_bundle tests to override the entity type definition.
  $entity_types['entity_test_with_bundle'] = $state->get('entity_test_with_bundle.entity_type', $entity_types['entity_test_with_bundle']);

  // Enable the entity_test_new only when needed.
  if (!$state->get('entity_test_new')) {
    unset($entity_types['entity_test_new']);
  }
}

/**
 * Implements hook_module_implements_alter().
 */
function entity_test_module_implements_alter(&$implementations, $hook) {
  // Move our hook_entity_type_alter() implementation to the beginning of the
  // list in order to run before content_moderation_entity_type_alter().
  if ($hook === 'entity_type_alter') {
    $implementations = ['entity_test' => $implementations['entity_test']] + $implementations;
  }
}

/**
 * Implements hook_entity_base_field_info().
 */
function entity_test_entity_base_field_info(EntityTypeInterface $entity_type) {
  $fields = [];

  if ($entity_type->id() == 'entity_test_mulrev' && \Drupal::state()->get('entity_test.field_test_item')) {
    $fields['field_test_item'] = BaseFieldDefinition::create('field_test')
      ->setLabel(t('Field test'))
      ->setDescription(t('A field test.'))
      ->setRevisionable(TRUE)
      ->setTranslatable(TRUE);
  }
  if ($entity_type->id() == 'entity_test_mulrev' && \Drupal::state()->get('entity_test.multi_column')) {
    $fields['description'] = BaseFieldDefinition::create('shape')
      ->setLabel(t('Some custom description'))
      ->setTranslatable(TRUE);
  }

  return $fields;
}

/**
 * Implements hook_entity_base_field_info_alter().
 */
function entity_test_entity_base_field_info_alter(&$fields, EntityTypeInterface $entity_type) {
  $state = \Drupal::state();
  if ($entity_type->id() == 'entity_test_mulrev' && ($names = $state->get('entity_test.field_definitions.translatable'))) {
    foreach ($names as $name => $value) {
      $fields[$name]->setTranslatable($value);
    }
  }
  if ($entity_type->id() == 'node' && $state->get('entity_test.node_remove_status_field')) {
    unset($fields['status']);
  }
  if ($entity_type->id() == 'entity_test' && $state->get('entity_test.remove_name_field')) {
    unset($fields['name']);
  }
  // In 8001 we are assuming that a new definition with multiple cardinality has
  // been deployed.
  // @todo Remove this if we end up using state definitions at runtime. See
  //    https://www.drupal.org/node/2554235.
  if ($entity_type->id() == 'entity_test' && $state->get('entity_test.db_updates.entity_definition_updates') == 8001) {
    $fields['user_id']->setCardinality(FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED);
  }
}

/**
 * Implements hook_entity_field_storage_info().
 */
function entity_test_entity_field_storage_info(EntityTypeInterface $entity_type) {
  if ($entity_type->id() == 'entity_test_update') {
    return \Drupal::state()->get('entity_test_update.additional_field_storage_definitions', []);
  }
}

/**
 * Creates a new bundle for entity_test entities.
 *
 * @param string $bundle
 *   The machine-readable name of the bundle.
 * @param string $text
 *   (optional) The human-readable name of the bundle. If none is provided, the
 *   machine name will be used.
 * @param string $entity_type
 *   (optional) The entity type for which the bundle is created. Defaults to
 *   'entity_test'.
 */
function entity_test_create_bundle($bundle, $text = NULL, $entity_type = 'entity_test') {
  $bundles = \Drupal::state()->get($entity_type . '.bundles') ?: [$entity_type => ['label' => 'Entity Test Bundle']];
  $bundles += [$bundle => ['label' => $text ? $text : $bundle]];
  \Drupal::state()->set($entity_type . '.bundles', $bundles);

  \Drupal::entityManager()->onBundleCreate($bundle, $entity_type);
}

/**
 * Deletes a bundle for entity_test entities.
 *
 * @param string $bundle
 *   The machine-readable name of the bundle to delete.
 * @param string $entity_type
 *   (optional) The entity type for which the bundle is deleted. Defaults to
 *   'entity_test'.
 */
function entity_test_delete_bundle($bundle, $entity_type = 'entity_test') {
  $bundles = \Drupal::state()->get($entity_type . '.bundles') ?: [$entity_type => ['label' => 'Entity Test Bundle']];
  unset($bundles[$bundle]);
  \Drupal::state()->set($entity_type . '.bundles', $bundles);

  \Drupal::entityManager()->onBundleDelete($bundle, $entity_type);
}

/**
 * Implements hook_entity_bundle_info().
 */
function entity_test_entity_bundle_info() {
  $bundles = [];
  $entity_types = \Drupal::entityManager()->getDefinitions();
  foreach ($entity_types as $entity_type_id => $entity_type) {
    if ($entity_type->getProvider() == 'entity_test' && $entity_type_id != 'entity_test_with_bundle') {
      $bundles[$entity_type_id] = \Drupal::state()->get($entity_type_id . '.bundles') ?: [$entity_type_id => ['label' => 'Entity Test Bundle']];
    }
  }
  return $bundles;
}

/**
 * Implements hook_entity_view_mode_info_alter().
 */
function entity_test_entity_view_mode_info_alter(&$view_modes) {
  $entity_info = \Drupal::entityManager()->getDefinitions();
  foreach ($entity_info as $entity_type => $info) {
    if ($entity_info[$entity_type]->getProvider() == 'entity_test' && !isset($view_modes[$entity_type])) {
      $view_modes[$entity_type] = [
        'full' => [
          'label' => t('Full object'),
          'status' => TRUE,
          'cache' => TRUE,
        ],
        'teaser' => [
          'label' => t('Teaser'),
          'status' => TRUE,
          'cache' => TRUE,
        ],
      ];
    }
  }
}

/**
 * Implements hook_entity_form_mode_info_alter().
 */
function entity_test_entity_form_mode_info_alter(&$form_modes) {
  $entity_info = \Drupal::entityManager()->getDefinitions();
  foreach ($entity_info as $entity_type => $info) {
    if ($entity_info[$entity_type]->getProvider() == 'entity_test') {
      $form_modes[$entity_type] = [
        'compact' => [
          'label' => t('Compact version'),
          'status' => TRUE,
        ],
      ];
    }
  }
}

/**
 * Implements hook_entity_extra_field_info().
 */
function entity_test_entity_extra_field_info() {
  $extra['entity_test']['bundle_with_extra_fields'] = [
    'display' => [
      // Note: those extra fields do not currently display anything, they are
      // just used in \Drupal\Tests\field_ui\Kernel\EntityDisplayTest to test
      // the behavior of entity display objects.
      'display_extra_field' => [
        'label' => t('Display extra field'),
        'description' => t('An extra field on the display side.'),
        'weight' => 5,
        'visible' => TRUE,
      ],
      'display_extra_field_hidden' => [
        'label' => t('Display extra field (hidden)'),
        'description' => t('An extra field on the display side, hidden by default.'),
        'visible' => FALSE,
      ],
    ]
  ];

  return $extra;
}

/**
 * Implements hook_form_BASE_FORM_ID_alter().
 */
function entity_test_form_entity_test_form_alter(&$form) {
  switch (\Drupal::state()->get('entity_test.form.validate.test')) {
    case 'form-level':
      $form['#validate'][] = 'entity_test_form_entity_test_form_validate';
      $form['#validate'][] = 'entity_test_form_entity_test_form_validate_check';
      break;

    case 'button-level':
      $form['actions']['submit']['#validate'][] = 'entity_test_form_entity_test_form_validate';
  }
}

/**
 * Validation handler for the entity_test entity form.
 */
function entity_test_form_entity_test_form_validate(array &$form, FormStateInterface $form_state) {
  $form['#entity_test_form_validate'] = TRUE;
}

/**
 * Validation handler for the entity_test entity form.
 */
function entity_test_form_entity_test_form_validate_check(array &$form, FormStateInterface $form_state) {
  if (!empty($form['#entity_test_form_validate'])) {
    \Drupal::state()->set('entity_test.form.validate.result', TRUE);
  }
}

/**
 * Implements hook_form_BASE_FORM_ID_alter().
 */
function entity_test_form_node_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  $langcode = $form_state->getFormObject()->getFormLangcode($form_state);
  \Drupal::state()->set('entity_test.form_langcode', $langcode);
}

/**
 * Loads a test entity.
 *
 * @param int $id
 *   A test entity ID.
 * @param bool $reset
 *   A boolean indicating that the internal cache should be reset.
 *
 * @return \Drupal\entity_test\Entity\EntityTest
 *   The loaded entity object, or NULL if the entity cannot be loaded.
 */
function entity_test_load($id, $reset = FALSE) {
  $storage = \Drupal::entityTypeManager()->getStorage('entity_test');
  if ($reset) {
    $storage->resetCache([$id]);
  }
  return $storage->load($id);
}

/**
 * Loads a test entity.
 *
 * @param int $id
 *   A test entity ID.
 * @param bool $reset
 *   A boolean indicating that the internal cache should be reset.
 *
 * @return \Drupal\entity_test\Entity\EntityTestRev
 *   The loaded entity object, or NULL if the entity cannot be loaded.
 */
function entity_test_rev_load($id, $reset = FALSE) {
  $storage = \Drupal::entityTypeManager()->getStorage('entity_test_rev');
  if ($reset) {
    $storage->resetCache([$id]);
  }
  return $storage->load($id);
}

/**
 * Loads a test entity.
 *
 * @param int $id
 *   A test entity ID.
 * @param bool $reset
 *   A boolean indicating that the internal cache should be reset.
 *
 * @return \Drupal\entity_test\Entity\EntityTestMul
 *   The loaded entity object, or FALSE if the entity cannot be loaded.
 */
function entity_test_mul_load($id, $reset = FALSE) {
  $storage = \Drupal::entityTypeManager()->getStorage('entity_test_mul');
  if ($reset) {
    $storage->resetCache([$id]);
  }
  return $storage->load($id);
}

/**
 * Loads a test entity.
 *
 * @param int $id
 *   A test entity ID.
 * @param bool $reset
 *   A boolean indicating that the internal cache should be reset.
 *
 * @return \Drupal\entity_test\Entity\EntityTestMulRev
 *   The loaded entity object, or NULL if the entity cannot be loaded.
 */
function entity_test_mulrev_load($id, $reset = FALSE) {
  $storage = \Drupal::entityTypeManager()->getStorage('entity_test_mulrev');
  if ($reset) {
    $storage->resetCache([$id]);
  }
  return $storage->load($id);
}

/**
 * Implements hook_ENTITY_TYPE_insert() for 'entity_test'.
 */
function entity_test_entity_test_insert($entity) {
  if ($entity->name->value == 'fail_insert') {
    throw new Exception("Test exception rollback.");
  }
}

/**
 * Implements hook_entity_insert().
 */
function entity_test_entity_insert(EntityInterface $entity) {
  if ($entity->getEntityTypeId() == 'entity_test_mulrev' && $entity->label() == 'EntityLoadedRevisionTest') {
    $entity->setNewRevision(FALSE);
    $entity->save();
  }
}

/**
 * Implements hook_entity_update().
 */
function entity_test_entity_update(EntityInterface $entity) {
  if ($entity instanceof ContentEntityInterface) {
    \Drupal::state()->set('entity_test.loadedRevisionId', $entity->getLoadedRevisionId());
  }
}

/**
 * Implements hook_entity_field_access().
 *
 * @see \Drupal\system\Tests\Entity\FieldAccessTest::testFieldAccess()
 */
function entity_test_entity_field_access($operation, FieldDefinitionInterface $field_definition, AccountInterface $account, FieldItemListInterface $items = NULL) {
  if ($field_definition->getName() == 'field_test_text') {
    if ($items) {
      if ($items->value == 'no access value') {
        return AccessResult::forbidden()->addCacheableDependency($items->getEntity());
      }
      elseif ($items->value == 'custom cache tag value') {
        return AccessResult::allowed()->addCacheableDependency($items->getEntity())->addCacheTags(['entity_test_access:field_test_text']);
      }
      elseif ($operation == 'edit' && $items->value == 'no edit access value') {
        return AccessResult::forbidden()->addCacheableDependency($items->getEntity());
      }
    }
  }
  if ($field = \Drupal::state()->get('views_field_access_test-field')) {
    if ($field_definition->getName() === $field) {
      $result = AccessResult::allowedIfHasPermission($account, 'view test entity field');
      // For test purposes we want to actively deny access.
      if ($result->isNeutral()) {
        $result = AccessResult::forbidden();
      }
      return $result;
    }
  }

  // No opinion.
  return AccessResult::neutral();
}

/**
 * Implements hook_entity_field_access_alter().
 *
 * @see \Drupal\system\Tests\Entity\FieldAccessTest::testFieldAccess()
 */
function entity_test_entity_field_access_alter(array &$grants, array $context) {
  if ($context['field_definition']->getName() == 'field_test_text' && $context['items']->value == 'access alter value') {
    $grants[':default'] = AccessResult::forbidden()->inheritCacheability($grants[':default'])->addCacheableDependency($context['items']->getEntity());
  }
}

/**
 * Implements hook_entity_form_display_alter().
 */
function entity_test_entity_form_display_alter(EntityFormDisplay $form_display, $context) {
  // Make the field_test_text field 42 characters for entity_test_mul.
  if ($context['entity_type'] == 'entity_test') {
    if ($component_options = $form_display->getComponent('field_test_text')) {
      $component_options['settings']['size'] = 42;
      $form_display->setComponent('field_test_text', $component_options);
    }
  }
}

/**
 * Implements hook_entity_presave().
 */
function entity_test_entity_presave(EntityInterface $entity) {
  if (isset($GLOBALS['entity_test_throw_exception'])) {
    throw new Exception('Entity presave exception', 1);
  }

  if ($entity->getEntityType()->id() == 'entity_view_display') {
    $entity->setThirdPartySetting('entity_test', 'foo', 'bar');
  }
}

/**
 * Implements hook_entity_predelete().
 */
function entity_test_entity_predelete(EntityInterface $entity) {
  if (isset($GLOBALS['entity_test_throw_exception'])) {
    throw new Exception('Entity predelete exception', 2);
  }
}

/**
 * Implements hook_entity_operation_alter().
 */
function entity_test_entity_operation_alter(array &$operations, EntityInterface $entity) {
  $valid_entity_type_ids = [
    'user_role',
    'block',
  ];
  if (in_array($entity->getEntityTypeId(), $valid_entity_type_ids)) {
    if (\Drupal::service('router.route_provider')->getRouteByName("entity.{$entity->getEntityTypeId()}.test_operation")) {
      $operations['test_operation'] = [
        'title' => format_string('Test Operation: @label', ['@label' => $entity->label()]),
        'url' => Url::fromRoute("entity.{$entity->getEntityTypeId()}.test_operation", [$entity->getEntityTypeId() => $entity->id()]),
        'weight' => 50,
      ];
    }
  }
}

/**
 * Implements hook_entity_translation_create().
 */
function entity_test_entity_translation_create(EntityInterface $translation) {
  _entity_test_record_hooks('entity_translation_create', $translation->language()->getId());
}

/**
 * Implements hook_entity_translation_insert().
 */
function entity_test_entity_translation_insert(EntityInterface $translation) {
  _entity_test_record_hooks('entity_translation_insert', $translation->language()->getId());
}

/**
 * Implements hook_entity_translation_delete().
 */
function entity_test_entity_translation_delete(EntityInterface $translation) {
  _entity_test_record_hooks('entity_translation_delete', $translation->language()->getId());
}

/**
 * Implements hook_ENTITY_TYPE_translation_create() for 'entity_test_mul'.
 */
function entity_test_entity_test_mul_translation_create(EntityInterface $translation) {
  _entity_test_record_hooks('entity_test_mul_translation_create', $translation->language()->getId());
}

/**
 * Implements hook_ENTITY_TYPE_translation_insert() for 'entity_test_mul'.
 */
function entity_test_entity_test_mul_translation_insert(EntityInterface $translation) {
  _entity_test_record_hooks('entity_test_mul_translation_insert', $translation->language()->getId());
}

/**
 * Implements hook_ENTITY_TYPE_translation_delete() for 'entity_test_mul'.
 */
function entity_test_entity_test_mul_translation_delete(EntityInterface $translation) {
  _entity_test_record_hooks('entity_test_mul_translation_delete', $translation->language()->getId());
}

/**
 * Implements hook_ENTITY_TYPE_translation_create() for 'entity_test_mul_changed'.
 */
function entity_test_entity_test_mul_changed_translation_create(EntityInterface $translation) {
  _entity_test_record_hooks('entity_test_mul_changed_translation_create', $translation->language()->getId());
}

/**
 * Implements hook_ENTITY_TYPE_translation_insert() for 'entity_test_mul_changed'.
 */
function entity_test_entity_test_mul_changed_translation_insert(EntityInterface $translation) {
  _entity_test_record_hooks('entity_test_mul_changed_translation_insert', $translation->language()->getId());
}

/**
 * Implements hook_ENTITY_TYPE_translation_delete().
 */
function entity_test_entity_test_mul_changed_translation_delete(EntityInterface $translation) {
  _entity_test_record_hooks('entity_test_mul_changed_translation_delete', $translation->language()->getId());
}

/**
 * Implements hook_ENTITY_TYPE_translation_create().
 */
function entity_test_entity_test_mulrev_translation_create(EntityInterface $translation) {
  _entity_test_record_hooks('entity_test_mulrev_translation_create', $translation->language()->getId());
}

/**
 * Implements hook_ENTITY_TYPE_translation_insert().
 */
function entity_test_entity_test_mulrev_translation_insert(EntityInterface $translation) {
  _entity_test_record_hooks('entity_test_mulrev_translation_insert', $translation->language()->getId());
}

/**
 * Implements hook_ENTITY_TYPE_translation_delete() for 'entity_test_mulrev'.
 */
function entity_test_entity_test_mulrev_translation_delete(EntityInterface $translation) {
  _entity_test_record_hooks('entity_test_mulrev_translation_delete', $translation->language()->getId());
}

/**
 * Implements hook_ENTITY_TYPE_translation_create() for 'entity_test_mulrev_changed'.
 */
function entity_test_entity_test_mulrev_changed_translation_create(EntityInterface $translation) {
  _entity_test_record_hooks('entity_test_mulrev_changed_translation_create', $translation->language()->getId());
}

/**
 * Implements hook_ENTITY_TYPE_translation_insert() for 'entity_test_mulrev'.
 */
function entity_test_entity_test_mulrev_changed_translation_insert(EntityInterface $translation) {
  _entity_test_record_hooks('entity_test_mulrev_changed_translation_insert', $translation->language()->getId());
}

/**
 * Implements hook_ENTITY_TYPE_translation_delete().
 */
function entity_test_entity_test_mulrev_changed_translation_delete(EntityInterface $translation) {
  _entity_test_record_hooks('entity_test_mulrev_changed_translation_delete', $translation->language()->getId());
}

/**
 * Implements hook_ENTITY_TYPE_translation_create() for 'entity_test_mul_langcode_key'.
 */
function entity_test_entity_test_mul_langcode_key_translation_create(EntityInterface $translation) {
  _entity_test_record_hooks('entity_test_mul_langcode_key_translation_create', $translation->language()->getId());
}

/**
 * Implements hook_ENTITY_TYPE_translation_insert() for 'entity_test_mul_langcode_key'.
 */
function entity_test_entity_test_mul_langcode_key_translation_insert(EntityInterface $translation) {
  _entity_test_record_hooks('entity_test_mul_langcode_key_translation_insert', $translation->language()->getId());
}

/**
 * Implements hook_ENTITY_TYPE_translation_delete() for 'entity_test_mul_langcode_key'.
 */
function entity_test_entity_test_mul_langcode_key_translation_delete(EntityInterface $translation) {
  _entity_test_record_hooks('entity_test_mul_langcode_key_translation_delete', $translation->language()->getId());
}

/**
 * Field default value callback.
 *
 * @param \Drupal\Core\Entity\FieldableEntityInterface $entity
 *   The entity being created.
 * @param \Drupal\Core\Field\FieldDefinitionInterface $definition
 *   The field definition.
 *
 * @return array
 *   An array of default values, in the same format as the $default_value
 *   property.
 *
 * @see \Drupal\field\Entity\FieldConfig::$default_value
 */
function entity_test_field_default_value(FieldableEntityInterface $entity, FieldDefinitionInterface $definition) {
  // Include the field name and entity language in the generated values to check
  // that they are correctly passed.
  $string = $definition->getName() . '_' . $entity->language()->getId();
  // Return a "default value" with multiple items.
  return [
    [
      'shape' => "shape:0:$string",
      'color' => "color:0:$string",
    ],
    [
      'shape' => "shape:1:$string",
      'color' => "color:1:$string",
    ],
  ];
}

/**
 * Helper function to be used to record hook invocations.
 *
 * @param string $hook
 *   The hook name.
 * @param mixed $data
 *   Arbitrary data associated with the hook invocation.
 */
function _entity_test_record_hooks($hook, $data) {
  $state = \Drupal::state();
  $key = 'entity_test.hooks';
  $hooks = $state->get($key);
  $hooks[$hook] = $data;
  $state->set($key, $hooks);
}

/**
 * Implements hook_entity_prepare_view().
 */
function entity_test_entity_prepare_view($entity_type, array $entities, array $displays) {
  if ($entity_type == 'entity_test') {
    foreach ($entities as $entity) {
      /** @var \Drupal\Core\Entity\ContentEntityInterface $entity */

      // Add a dummy field item attribute on field_test_text if it exists.
      if ($entity->hasField('field_test_text') && $displays[$entity->bundle()]->getComponent('field_test_text')) {
        foreach ($entity->get('field_test_text') as $item) {
          $item->_attributes += ['data-field-item-attr' => 'foobar'];
        }
      }

      // Add a dummy field item attribute on daterange fields if they exist.
      $fields = $entity->getFieldDefinitions();
      foreach ($fields as $field) {
        if ($field->getType() === 'daterange') {
          $item = $entity->get($field->getName());
          $item->_attributes += ['data-field-item-attr' => 'foobar'];
        }
      }
    }
  }
}

/**
 * Implements hook_entity_display_build_alter().
 */
function entity_test_entity_display_build_alter(&$build, $context) {
  /** @var \Drupal\Core\Entity\ContentEntityInterface $entity */
  $entity = $context['entity'];
  if ($entity->getEntityTypeId() == 'entity_test' && $entity->bundle() == 'display_build_alter_bundle') {
    $build['entity_display_build_alter']['#markup'] = 'Content added in hook_entity_display_build_alter for entity id ' . $entity->id();
  }
}

/**
 * Implements hook_entity_access().
 */
function entity_test_entity_access(EntityInterface $entity, $operation, AccountInterface $account) {
  // Only apply to the 'entity_test' entities.
  if ($entity->getEntityType()->getProvider() != 'entity_test') {
    return AccessResult::neutral();
  }
  \Drupal::state()->set('entity_test_entity_access', TRUE);

  // Attempt to allow access to entities with the title forbid_access,
  // this will be overridden by
  // \Drupal\entity_test\EntityTestAccessControlHandler::checkAccess().
  if ($entity->label() == 'forbid_access') {
    return AccessResult::allowed();
  }

  // Uncacheable because the access result depends on a State key-value pair and
  // might therefore change at any time.
  $condition = \Drupal::state()->get("entity_test_entity_access.{$operation}." . $entity->id(), FALSE);
  return AccessResult::allowedIf($condition)->setCacheMaxAge(0);
}

/**
 * Implements hook_ENTITY_TYPE_access() for 'entity_test'.
 */
function entity_test_entity_test_access(EntityInterface $entity, $operation, AccountInterface $account) {
  \Drupal::state()->set('entity_test_entity_test_access', TRUE);

  // No opinion.
  return AccessResult::neutral();
}

/**
 * Implements hook_entity_create_access().
 */
function entity_test_entity_create_access(AccountInterface $account, $context, $entity_bundle) {
  \Drupal::state()->set('entity_test_entity_create_access', TRUE);
  \Drupal::state()->set('entity_test_entity_create_access_context', $context);

  // No opinion.
  return AccessResult::neutral();
}

/**
 * Implements hook_ENTITY_TYPE_create_access() for 'entity_test'.
 */
function entity_test_entity_test_create_access(AccountInterface $account, $context, $entity_bundle) {
  \Drupal::state()->set('entity_test_entity_test_create_access', TRUE);

  // No opinion.
  return AccessResult::neutral();
}