<?php

namespace Drupal\Core\Field;

use Drupal\Core\State\StateInterface;

/**
 * Provides a repository for deleted field and field storage objects.
 *
 * @internal
 */
class DeletedFieldsRepository implements DeletedFieldsRepositoryInterface {

  /**
   * The state key/value store.
   *
   * @var \Drupal\Core\State\StateInterface
   */
  protected $state;

  /**
   * Constructs a new deleted fields repository.
   *
   * @param \Drupal\Core\State\StateInterface $state
   *   The state key/value store.
   */
  public function __construct(StateInterface $state) {
    $this->state = $state;
  }

  /**
   * {@inheritdoc}
   */
  public function getFieldDefinitions($field_storage_unique_id = NULL) {
    $deleted_field_definitions = $this->state->get('field.field.deleted', []);

    if ($field_storage_unique_id) {
      $deleted_field_definitions = array_filter($deleted_field_definitions, function (FieldDefinitionInterface $field_definition) use ($field_storage_unique_id) {
        return $field_definition->getFieldStorageDefinition()->getUniqueStorageIdentifier() === $field_storage_unique_id;
      });
    }

    return $deleted_field_definitions;
  }

  /**
   * {@inheritdoc}
   */
  public function getFieldStorageDefinitions() {
    return $this->state->get('field.storage.deleted', []);
  }

  /**
   * {@inheritdoc}
   */
  public function addFieldDefinition(FieldDefinitionInterface $field_definition) {
    $deleted_field_definitions = $this->state->get('field.field.deleted', []);
    $deleted_field_definitions[$field_definition->getUniqueIdentifier()] = $field_definition;
    $this->state->set('field.field.deleted', $deleted_field_definitions);

    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function addFieldStorageDefinition(FieldStorageDefinitionInterface $field_storage_definition) {
    $deleted_storage_definitions = $this->state->get('field.storage.deleted', []);
    $deleted_storage_definitions[$field_storage_definition->getUniqueStorageIdentifier()] = $field_storage_definition;
    $this->state->set('field.storage.deleted', $deleted_storage_definitions);

    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function removeFieldDefinition(FieldDefinitionInterface $field_definition) {
    $deleted_field_definitions = $this->state->get('field.field.deleted', []);;
    unset($deleted_field_definitions[$field_definition->getUniqueIdentifier()]);
    $this->state->set('field.field.deleted', $deleted_field_definitions);

    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function removeFieldStorageDefinition(FieldStorageDefinitionInterface $field_storage_definition) {
    $deleted_storage_definitions = $this->state->get('field.storage.deleted', []);
    unset($deleted_storage_definitions[$field_storage_definition->getUniqueStorageIdentifier()]);
    $this->state->set('field.storage.deleted', $deleted_storage_definitions);

    return $this;
  }

}