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<?php

/*
 * This file is part of the FOSRestBundle package.
 *
 * (c) FriendsOfSymfony <http://friendsofsymfony.github.com/>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace FOS\RestBundle\Request;

use Doctrine\Common\Util\ClassUtils;
use FOS\RestBundle\Controller\Annotations\ParamInterface;
use Symfony\Component\HttpFoundation\Request;

/**
 * Contains the {@link ParamFetcher} params and links them to a request.
 *
 * @internal
 */
final class ParameterBag
{
    private $paramReader;
    private $params = [];

    public function __construct(ParamReaderInterface $paramReader)
    {
        $this->paramReader = $paramReader;
    }

    public function getParams(Request $request): array
    {
        $requestId = spl_object_hash($request);
        if (!isset($this->params[$requestId]) || empty($this->params[$requestId]['controller'])) {
            throw new \InvalidArgumentException('Controller and method needs to be set via setController.');
        }
        if (null === $this->params[$requestId]['params']) {
            return $this->initParams($requestId);
        }

        return $this->params[$requestId]['params'];
    }

    public function addParam(Request $request, ParamInterface $param): void
    {
        $requestId = spl_object_hash($request);
        $this->getParams($request);

        $this->params[$requestId]['params'][$param->getName()] = $param;
    }

    public function setController(Request $request, callable $controller): void
    {
        $requestId = spl_object_hash($request);
        $this->params[$requestId] = [
            'controller' => $controller,
            'params' => null,
        ];
    }

    /**
     * @return ParamInterface[]
     */
    private function initParams(string $requestId): array
    {
        $controller = $this->params[$requestId]['controller'];
        if (!is_array($controller) || empty($controller[0]) || !is_object($controller[0])) {
            throw new \InvalidArgumentException('Controller needs to be set as a class instance (closures/functions are not supported)');
        }

        $class = class_exists(ClassUtils::class)
            ? ClassUtils::getClass($controller[0])
            : get_class($controller[0]);

        return $this->params[$requestId]['params'] = $this->paramReader->read(
            new \ReflectionClass($class),
            $controller[1]
        );
    }
}