<?php

/*
 * This file is part of the API Platform project.
 *
 * (c) Kévin Dunglas <dunglas@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

declare(strict_types=1);

namespace ApiPlatform\State;

use ApiPlatform\Exception\RuntimeException;
use ApiPlatform\Metadata\HttpOperation;
use ApiPlatform\Metadata\Operation;
use ApiPlatform\Metadata\Resource\Factory\ResourceMetadataCollectionFactoryInterface;
use ApiPlatform\State\Exception\ProviderNotFoundException;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
use Symfony\Component\PropertyAccess\PropertyAccess;
use Symfony\Component\PropertyAccess\PropertyAccessorInterface;

/**
 * An ItemProvider for POST operations on generated subresources.
 *
 * @see ApiPlatform\Tests\Fixtures\TestBundle\Entity\SubresourceEmployee
 *
 * @author Antoine Bluchet <soyuka@gmail.com>
 *
 * @experimental
 *
 * @internal
 */
final class CreateProvider implements ProviderInterface
{
    public function __construct(
        private ProviderInterface $decorated,
        private ResourceMetadataCollectionFactoryInterface $resourceMetadataCollectionFactory,
        private ?PropertyAccessorInterface $propertyAccessor = null,
    ) {
        $this->propertyAccessor = $propertyAccessor ?: PropertyAccess::createPropertyAccessor();
    }

    public function provide(Operation $operation, array $uriVariables = [], array $context = []): ?object
    {
        if (!$uriVariables || !$operation instanceof HttpOperation || (null !== $operation->getController() && 'api_platform.symfony.main_controller' !== $operation->getController())) {
            return $this->decorated->provide($operation, $uriVariables, $context);
        }

        $operationUriVariables = $operation->getUriVariables();
        $relationClass = current($operationUriVariables)->getFromClass();
        $key = key($operationUriVariables);

        $parentOperation = $this->resourceMetadataCollectionFactory
            ->create($relationClass)
            ->getOperation($operation->getExtraProperties()['parent_uri_template'] ?? null);
        try {
            $relation = $this->decorated->provide($parentOperation, $uriVariables, $context);
        } catch (ProviderNotFoundException) {
            $relation = null;
        }
        if (!$relation) {
            throw new NotFoundHttpException('Not Found');
        }

        try {
            $resource = new ($operation->getClass());
        } catch (\Throwable $e) {
            throw new RuntimeException(sprintf('An error occurred while trying to create an instance of the "%s" resource. Consider writing your own "%s" implementation and setting it as `provider` on your operation instead.', $operation->getClass(), ProviderInterface::class), 0, $e);
        }

        $property = $operationUriVariables[$key]->getToProperty() ?? $key;
        $this->propertyAccessor->setValue($resource, $property, $relation);

        return $resource;
    }
}