<?php

namespace Drupal\thunder_vgwort\Plugin\GraphQL\SchemaExtension;

use Drupal\graphql\GraphQL\ResolverRegistryInterface;
use Drupal\thunder_gqls\Plugin\GraphQL\SchemaExtension\ThunderSchemaExtensionPluginBase;

/**
 * The Thunder VG Wort schema extension.
 *
 * @SchemaExtension(
 *   id = "thunder_vgwort",
 *   name = "Thunder VG Wort extension",
 *   description = "Adds vgWort field to article, depends on VG Wort schema.",
 *   schema = "thunder"
 * )
 */
class ThunderVgWortSchemaExtension extends ThunderSchemaExtensionPluginBase {

  /**
   * {@inheritdoc}
   */
  public function getBaseDefinition(): NULL {
    return NULL;
  }

  /**
   * {@inheritdoc}
   */
  public function registerResolvers(ResolverRegistryInterface $registry): void {
    parent::registerResolvers($registry);

    $this->addFieldResolverIfNotExists('Article', 'vgWort',
      $this->builder->produce('vgwort')
        ->map('entity', $this->builder->fromParent())
    );

  }

}
