<?php

namespace Drupal\social_private_message\Element;

use Drupal\Core\Form\FormStateInterface;
use Drupal\social_core\Entity\Element\EntityAutocomplete;

/**
 * Provides an private message member autocomplete form element.
 *
 * The #default_value accepted by this element is either an entity object or an
 * array of entity objects.
 *
 * @FormElement("social_private_message_entity_autocomplete")
 */
class SocialPrivateMessageEntityAutocomplete extends EntityAutocomplete {

  /**
   * {@inheritdoc}
   */
  public static function validateEntityAutocomplete(
    array &$element,
    FormStateInterface $form_state,
    array &$complete_form,
  ): void {
    parent::validateEntityAutocomplete($element, $form_state, $complete_form);

    $value = $form_state->getValue('members');
    $form_state->setValue('members', $value['target_id']);
  }

}
