namespace App;

use Symfony\Component\Security\Core\Authentication\Provider\AuthenticationProviderInterface;
use Symfony\Component\Security\Core\User\UserProviderInterface;
use Symfony\Component\Security\Core\Exception\AuthenticationServiceException;
use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;

class LdapAuthenticationProvider implements AuthenticationProviderInterface
{
    private $userProvider;
    private $providerKey;

    public function __construct(UserProviderInterface $userProvider, $providerKey)
    {
        $this->userProvider = $userProvider;
        $this->providerKey = $providerKey;
    }

    /**
     * {@inheritdoc}
     */
    protected function retrieveUser($username, LdapUserToken $token)
    {
        $user = $token->getUser();
        if ($user instanceof UserInterface) {
            return $user;
        }

        try {
            $user = $this->userProvider->loadUserByUsernameAndPassword(
                $user,
                $token->getCredentials()
            );

            if (!$user instanceof UserInterface) {
                throw new AuthenticationServiceException('The user provider must return a UserInterface object.');
            }

            return $user;
        } catch (UsernameNotFoundException $notFound) {
            throw $notFound;
        }
    }

    public function supports(TokenInterface $token)
    {
        return $token instanceof LdapUserToken;
    }

    public function authenticate(TokenInterface $token)
    {

        if (!$this->supports($token)) {
            return null;
        }

        $username = $token->getUsername();
        if (empty($username)) {
            $username = 'NONE_PROVIDED';
        }

        try {
            $user = $this->retrieveUser($username, $token);
        } catch (UsernameNotFoundException $notFound) {
            throw new BadCredentialsException('Bad credentials', 0, $notFound);
        }

        if (!$user instanceof UserInterface) {
            throw new AuthenticationServiceException('retrieveUser() must return a UserInterface.');
        }

        try {
            $this->checkAuthentication($user, $token);
        } catch (BadCredentialsException $e) {
            if ($this->hideUserNotFoundExceptions) {
                throw new BadCredentialsException('Bad credentials', 0, $e);
            }

            throw $e;
        }

        $authenticatedToken = new LdapUserToken(
            $user,
            $token->getCredentials(),
            $user->getRoles()
        );

        return $authenticatedToken;
    }
}