class EntityDefinitionUpdateManager

class EntityDefinitionUpdateManager implements EntityDefinitionUpdateManagerInterface {
    use StringTranslationTrait;
    
    /**
     * The entity field manager service.
     *
     * @var \Drupal\Core\Entity\EntityFieldManagerInterface
     */
    protected $entityFieldManager;
    
    /**
     * The entity type listener service.
     *
     * @var \Drupal\Core\Entity\EntityTypeListenerInterface
     */
    protected $entityTypeListener;
    
    /**
     * The entity type manager service.
     *
     * @var \Drupal\Core\Entity\EntityTypeManagerInterface
     */
    protected $entityTypeManager;
    
    /**
     * The field storage definition listener service.
     *
     * @var \Drupal\Core\Field\FieldStorageDefinitionListenerInterface
     */
    protected $fieldStorageDefinitionListener;
    
    /**
     * The last installed schema repository.
     *
     * @var \Drupal\Core\Entity\EntityLastInstalledSchemaRepositoryInterface
     */
    protected $entityLastInstalledSchemaRepository;
    
    /**
     * Constructs a new EntityDefinitionUpdateManager.
     *
     * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
     *   The entity type manager service.
     * @param \Drupal\Core\Entity\EntityLastInstalledSchemaRepositoryInterface $entity_last_installed_schema_repository
     *   The last installed schema repository service.
     * @param \Drupal\Core\Entity\EntityFieldManagerInterface $entity_field_manager
     *   The entity field manager service.
     * @param \Drupal\Core\Entity\EntityTypeListenerInterface $entity_type_listener
     *   The entity type listener interface.
     * @param \Drupal\Core\Field\FieldStorageDefinitionListenerInterface $field_storage_definition_listener
     *   The field storage definition listener service.
     */
    public function __construct(EntityTypeManagerInterface $entity_type_manager, EntityLastInstalledSchemaRepositoryInterface $entity_last_installed_schema_repository, EntityFieldManagerInterface $entity_field_manager, EntityTypeListenerInterface $entity_type_listener, FieldStorageDefinitionListenerInterface $field_storage_definition_listener) {
        $this->entityTypeManager = $entity_type_manager;
        $this->entityLastInstalledSchemaRepository = $entity_last_installed_schema_repository;
        $this->entityFieldManager = $entity_field_manager;
        $this->entityTypeListener = $entity_type_listener;
        $this->fieldStorageDefinitionListener = $field_storage_definition_listener;
    }
    
    /**
     * {@inheritdoc}
     */
    public function needsUpdates() {
        return (bool) $this->getChangeList();
    }
    
    /**
     * {@inheritdoc}
     */
    public function getChangeSummary() {
        $summary = [];
        foreach ($this->getChangeList() as $entity_type_id => $change_list) {
            // Process entity type definition changes.
            if (!empty($change_list['entity_type'])) {
                $entity_type = $this->entityTypeManager
                    ->getDefinition($entity_type_id);
                switch ($change_list['entity_type']) {
                    case static::DEFINITION_CREATED:
                        $summary[$entity_type_id][] = $this->t('The %entity_type entity type needs to be installed.', [
                            '%entity_type' => $entity_type->getLabel(),
                        ]);
                        break;
                    case static::DEFINITION_UPDATED:
                        $summary[$entity_type_id][] = $this->t('The %entity_type entity type needs to be updated.', [
                            '%entity_type' => $entity_type->getLabel(),
                        ]);
                        break;
                }
            }
            // Process field storage definition changes.
            if (!empty($change_list['field_storage_definitions'])) {
                $storage_definitions = $this->entityFieldManager
                    ->getFieldStorageDefinitions($entity_type_id);
                $original_storage_definitions = $this->entityLastInstalledSchemaRepository
                    ->getLastInstalledFieldStorageDefinitions($entity_type_id);
                foreach ($change_list['field_storage_definitions'] as $field_name => $change) {
                    switch ($change) {
                        case static::DEFINITION_CREATED:
                            $summary[$entity_type_id][] = $this->t('The %field_name field needs to be installed.', [
                                '%field_name' => $storage_definitions[$field_name]->getLabel() ?: $field_name,
                            ]);
                            break;
                        case static::DEFINITION_UPDATED:
                            $summary[$entity_type_id][] = $this->t('The %field_name field needs to be updated.', [
                                '%field_name' => $storage_definitions[$field_name]->getLabel() ?: $field_name,
                            ]);
                            break;
                        case static::DEFINITION_DELETED:
                            $summary[$entity_type_id][] = $this->t('The %field_name field needs to be uninstalled.', [
                                '%field_name' => $original_storage_definitions[$field_name]->getLabel() ?: $field_name,
                            ]);
                            break;
                    }
                }
            }
        }
        return $summary;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getEntityType($entity_type_id) {
        $entity_type = $this->entityLastInstalledSchemaRepository
            ->getLastInstalledDefinition($entity_type_id);
        return $entity_type ? clone $entity_type : NULL;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getEntityTypes() {
        return $this->entityLastInstalledSchemaRepository
            ->getLastInstalledDefinitions();
    }
    
    /**
     * {@inheritdoc}
     */
    public function installEntityType(EntityTypeInterface $entity_type) {
        $this->clearCachedDefinitions();
        $this->entityTypeListener
            ->onEntityTypeCreate($entity_type);
    }
    
    /**
     * {@inheritdoc}
     */
    public function updateEntityType(EntityTypeInterface $entity_type) {
        $original = $this->getEntityType($entity_type->id());
        $this->clearCachedDefinitions();
        $this->entityTypeListener
            ->onEntityTypeUpdate($entity_type, $original);
    }
    
    /**
     * {@inheritdoc}
     */
    public function uninstallEntityType(EntityTypeInterface $entity_type) {
        $this->clearCachedDefinitions();
        $this->entityTypeListener
            ->onEntityTypeDelete($entity_type);
    }
    
    /**
     * {@inheritdoc}
     */
    public function installFieldableEntityType(EntityTypeInterface $entity_type, array $field_storage_definitions) {
        $this->clearCachedDefinitions();
        foreach ($field_storage_definitions as $name => $field_storage_definition) {
            if ($field_storage_definition instanceof BaseFieldDefinition) {
                $field_storage_definition->setName($name)
                    ->setTargetEntityTypeId($entity_type->id())
                    ->setProvider($entity_type->getProvider())
                    ->setTargetBundle(NULL);
            }
        }
        $this->entityTypeListener
            ->onFieldableEntityTypeCreate($entity_type, $field_storage_definitions);
    }
    
    /**
     * {@inheritdoc}
     */
    public function updateFieldableEntityType(EntityTypeInterface $entity_type, array $field_storage_definitions, array &$sandbox = NULL) {
        $original = $this->getEntityType($entity_type->id());
        if ($this->requiresEntityDataMigration($entity_type, $original) && $sandbox === NULL) {
            throw new \InvalidArgumentException('The entity schema update for the ' . $entity_type->id() . ' entity type requires a data migration.');
        }
        $original_field_storage_definitions = $this->entityLastInstalledSchemaRepository
            ->getLastInstalledFieldStorageDefinitions($entity_type->id());
        $this->entityTypeListener
            ->onFieldableEntityTypeUpdate($entity_type, $original, $field_storage_definitions, $original_field_storage_definitions, $sandbox);
        $this->clearCachedDefinitions();
    }
    
    /**
     * {@inheritdoc}
     */
    public function installFieldStorageDefinition($name, $entity_type_id, $provider, FieldStorageDefinitionInterface $storage_definition) {
        // @todo Pass a mutable field definition interface when we have one. See
        //   https://www.drupal.org/node/2346329.
        if ($storage_definition instanceof BaseFieldDefinition) {
            $storage_definition->setName($name)
                ->setTargetEntityTypeId($entity_type_id)
                ->setProvider($provider)
                ->setTargetBundle(NULL);
        }
        $this->clearCachedDefinitions();
        $this->fieldStorageDefinitionListener
            ->onFieldStorageDefinitionCreate($storage_definition);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFieldStorageDefinition($name, $entity_type_id) {
        $storage_definitions = $this->entityLastInstalledSchemaRepository
            ->getLastInstalledFieldStorageDefinitions($entity_type_id);
        return isset($storage_definitions[$name]) ? clone $storage_definitions[$name] : NULL;
    }
    
    /**
     * {@inheritdoc}
     */
    public function updateFieldStorageDefinition(FieldStorageDefinitionInterface $storage_definition) {
        $original = $this->getFieldStorageDefinition($storage_definition->getName(), $storage_definition->getTargetEntityTypeId());
        $this->clearCachedDefinitions();
        $this->fieldStorageDefinitionListener
            ->onFieldStorageDefinitionUpdate($storage_definition, $original);
    }
    
    /**
     * {@inheritdoc}
     */
    public function uninstallFieldStorageDefinition(FieldStorageDefinitionInterface $storage_definition) {
        $this->clearCachedDefinitions();
        $this->fieldStorageDefinitionListener
            ->onFieldStorageDefinitionDelete($storage_definition);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getChangeList() {
        $this->entityTypeManager
            ->useCaches(FALSE);
        $this->entityFieldManager
            ->useCaches(FALSE);
        $change_list = [];
        foreach ($this->entityTypeManager
            ->getDefinitions() as $entity_type_id => $entity_type) {
            $original = $this->entityLastInstalledSchemaRepository
                ->getLastInstalledDefinition($entity_type_id);
            // @todo Support non-storage-schema-changing definition updates too:
            //   https://www.drupal.org/node/2336895.
            if (!$original) {
                $change_list[$entity_type_id]['entity_type'] = static::DEFINITION_CREATED;
            }
            else {
                if ($this->requiresEntityStorageSchemaChanges($entity_type, $original)) {
                    $change_list[$entity_type_id]['entity_type'] = static::DEFINITION_UPDATED;
                }
                if ($this->entityTypeManager
                    ->getStorage($entity_type_id) instanceof DynamicallyFieldableEntityStorageInterface) {
                    $field_changes = [];
                    $storage_definitions = $this->entityFieldManager
                        ->getFieldStorageDefinitions($entity_type_id);
                    $original_storage_definitions = $this->entityLastInstalledSchemaRepository
                        ->getLastInstalledFieldStorageDefinitions($entity_type_id);
                    // Detect created field storage definitions.
                    foreach (array_diff_key($storage_definitions, $original_storage_definitions) as $field_name => $storage_definition) {
                        $field_changes[$field_name] = static::DEFINITION_CREATED;
                    }
                    // Detect deleted field storage definitions.
                    foreach (array_diff_key($original_storage_definitions, $storage_definitions) as $field_name => $original_storage_definition) {
                        $field_changes[$field_name] = static::DEFINITION_DELETED;
                    }
                    // Detect updated field storage definitions.
                    foreach (array_intersect_key($storage_definitions, $original_storage_definitions) as $field_name => $storage_definition) {
                        // @todo Support non-storage-schema-changing definition updates too:
                        //   https://www.drupal.org/node/2336895. So long as we're checking
                        //   based on schema change requirements rather than definition
                        //   equality, skip the check if the entity type itself needs to be
                        //   updated, since that can affect the schema of all fields, so we
                        //   want to process that update first without reporting false
                        //   positives here.
                        if (!isset($change_list[$entity_type_id]['entity_type']) && $this->requiresFieldStorageSchemaChanges($storage_definition, $original_storage_definitions[$field_name])) {
                            $field_changes[$field_name] = static::DEFINITION_UPDATED;
                        }
                    }
                    if ($field_changes) {
                        $change_list[$entity_type_id]['field_storage_definitions'] = $field_changes;
                    }
                }
            }
        }
        // @todo Support deleting entity definitions when we support base field
        //   purging.
        // @see https://www.drupal.org/node/2907779
        $this->entityTypeManager
            ->useCaches(TRUE);
        $this->entityFieldManager
            ->useCaches(TRUE);
        return array_filter($change_list);
    }
    
    /**
     * Checks if the changes to the entity type requires storage schema changes.
     *
     * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
     *   The updated entity type definition.
     * @param \Drupal\Core\Entity\EntityTypeInterface $original
     *   The original entity type definition.
     *
     * @return bool
     *   TRUE if storage schema changes are required, FALSE otherwise.
     */
    protected function requiresEntityStorageSchemaChanges(EntityTypeInterface $entity_type, EntityTypeInterface $original) {
        $storage = $this->entityTypeManager
            ->getStorage($entity_type->id());
        return $storage instanceof EntityStorageSchemaInterface && $storage->requiresEntityStorageSchemaChanges($entity_type, $original);
    }
    
    /**
     * Checks if the changes to the storage definition requires schema changes.
     *
     * @param \Drupal\Core\Field\FieldStorageDefinitionInterface $storage_definition
     *   The updated field storage definition.
     * @param \Drupal\Core\Field\FieldStorageDefinitionInterface $original
     *   The original field storage definition.
     *
     * @return bool
     *   TRUE if storage schema changes are required, FALSE otherwise.
     */
    protected function requiresFieldStorageSchemaChanges(FieldStorageDefinitionInterface $storage_definition, FieldStorageDefinitionInterface $original) {
        $storage = $this->entityTypeManager
            ->getStorage($storage_definition->getTargetEntityTypeId());
        return $storage instanceof DynamicallyFieldableEntityStorageSchemaInterface && $storage->requiresFieldStorageSchemaChanges($storage_definition, $original);
    }
    
    /**
     * Checks if existing data would be lost if the schema changes were applied.
     *
     * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
     *   The updated entity type definition.
     * @param \Drupal\Core\Entity\EntityTypeInterface $original
     *   The original entity type definition.
     *
     * @return bool
     *   TRUE if data migration is required, FALSE otherwise.
     */
    protected function requiresEntityDataMigration(EntityTypeInterface $entity_type, EntityTypeInterface $original) {
        $storage = $this->entityTypeManager
            ->getStorage($entity_type->id());
        return $storage instanceof EntityStorageSchemaInterface && $storage->requiresEntityDataMigration($entity_type, $original);
    }
    
    /**
     * Clears necessary caches to apply entity/field definition updates.
     */
    protected function clearCachedDefinitions() {
        $this->entityTypeManager
            ->clearCachedDefinitions();
        $this->entityFieldManager
            ->clearCachedFieldDefinitions();
    }

}