<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
declare(strict_types=1);

namespace Magento\Framework\GraphQl\Query\Resolver;

use Magento\Framework\GraphQl\Query\BatchContractResolverWrapper;
use Magento\Framework\GraphQl\Query\BatchResolverWrapper;
use Magento\Framework\GraphQl\Query\ResolverInterface;
use Magento\Framework\ObjectManagerInterface;

/**
* Creates GraphQL resolvers based on configurations.
*/
class Factory
{
/**
* @var ObjectManagerInterface
*/
private $objectManager;

/**
* Factory constructor.
* @param ObjectManagerInterface $objectManager
*/
public function __construct(ObjectManagerInterface $objectManager)
{
$this->objectManager = $objectManager;
}

/**
* Create resolver by class name.
*
* @param string $class
* @return ResolverInterface
*/
public function createByClass(string $class): ResolverInterface
{
$resolverInstance = $this->objectManager->get($class);
if ($resolverInstance instanceof BatchResolverInterface) {
$resolver = $this->objectManager->create(BatchResolverWrapper::class, ['resolver' => $resolverInstance]);
} elseif ($resolverInstance instanceof BatchServiceContractResolverInterface) {
$resolver = $this->objectManager->create(
BatchContractResolverWrapper::class,
['resolver' => $resolverInstance]
);
} elseif ($resolverInstance instanceof ResolverInterface) {
$resolver = $resolverInstance;
} else {
throw new \RuntimeException($class .' cannot function as a GraphQL resolver');
}

return $resolver;
}
}