<?php

namespace Wallabag\CoreBundle\ParamConverter;

use Doctrine\Persistence\ManagerRegistry;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\ParamConverter;
use Sensio\Bundle\FrameworkExtraBundle\Request\ParamConverter\ParamConverterInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
use Wallabag\UserBundle\Entity\User;
use Wallabag\UserBundle\Repository\UserRepository;

/**
 * ParamConverter used in the Feed controller to retrieve the right user according to
 * username & token given in the url.
 *
 * @see http://stfalcon.com/en/blog/post/symfony2-custom-paramconverter
 */
class UsernameFeedTokenConverter implements ParamConverterInterface
{
    private $registry;

    /**
     * @param ManagerRegistry $registry Manager registry
     */
    public function __construct(ManagerRegistry $registry = null)
    {
        $this->registry = $registry;
    }

    /**
     * {@inheritdoc}
     *
     * Check, if object supported by our converter
     */
    public function supports(ParamConverter $configuration)
    {
        // If there is no manager, this means that only Doctrine DBAL is configured
        // In this case we can do nothing and just return
        if (null === $this->registry || !\count($this->registry->getManagers())) {
            return false;
        }

        // Check, if option class was set in configuration
        if (null === $configuration->getClass()) {
            return false;
        }

        // Get actual entity manager for class
        $em = $this->registry->getManagerForClass($configuration->getClass());

        // Check, if class name is what we need
        if (null !== $em && 'Wallabag\UserBundle\Entity\User' !== $em->getClassMetadata($configuration->getClass())->getName()) {
            return false;
        }

        return true;
    }

    /**
     * {@inheritdoc}
     *
     * Applies converting
     *
     * @throws \InvalidArgumentException When route attributes are missing
     * @throws NotFoundHttpException     When object not found
     */
    public function apply(Request $request, ParamConverter $configuration)
    {
        $username = $request->attributes->get('username');
        $feedToken = $request->attributes->get('token');

        if (!$request->attributes->has('username') || !$request->attributes->has('token')) {
            return false;
        }

        // Get actual entity manager for class
        $em = $this->registry->getManagerForClass($configuration->getClass());

        if (null === $em) {
            return false;
        }

        /** @var UserRepository $userRepository */
        $userRepository = $em->getRepository($configuration->getClass());

        // Try to find user by its username and config feed_token
        $user = $userRepository->findOneByUsernameAndFeedtoken($username, $feedToken);

        if (null === $user || !($user instanceof User)) {
            throw new NotFoundHttpException(sprintf('%s not found.', $configuration->getClass()));
        }

        // Map found user to the route's parameter
        $request->attributes->set($configuration->getName(), $user);

        return true;
    }
}