<?php

namespace Drupal\dds_content\Element;

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

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

  /**
   * {@inheritdoc}
   */
  public function getInfo() {
    $info = parent::getInfo();

    // Apply default form element properties.
    $info['#target_type'] = 'multiple';
    $info['#target_types'] = [];
    $info['#autocreate'] = FALSE;

    return $info;
  }


  /**
   * Adds entity autocomplete functionality to a form element.
   *
   * @param array $element
   *   The form element to process. Properties used:
   *   - #target_type: The ID of the target entity type.
   *   - #selection_handler: The plugin ID of the entity reference selection
   *     handler.
   *   - #selection_settings: An array of settings that will be passed to the
   *     selection handler.
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   *   The current state of the form.
   * @param array $complete_form
   *   The complete form structure.
   *
   * @return array
   *   The form element.
   *
   * @throws \InvalidArgumentException
   *   Exception thrown when the #target_type or #autocreate['bundle'] are
   *   missing.
   */
  public static function processEntityAutocomplete(array &$element, FormStateInterface $form_state, array &$complete_form) {
    $element = parent::processEntityAutocomplete($element, $form_state, $complete_form);

    $element['#autocomplete_route_name'] = 'dds_content.entity_autocomplete';
    $element['#autocomplete_route_parameters']['target_type'] = 'multiple';

    return $element;
  }


}