<?php

namespace League\OAuth2\Server\Grant;

use DateInterval;
use League\OAuth2\Server\Entities\UserEntityInterface;
use League\OAuth2\Server\Exception\OAuthServerException;
use League\OAuth2\Server\Repositories\RefreshTokenRepositoryInterface;
use League\OAuth2\Server\RequestEvent;
use League\OAuth2\Server\RequestTypes\AuthorizationRequest;
use League\OAuth2\Server\ResponseTypes\RedirectResponse;
use League\OAuth2\Server\ResponseTypes\ResponseTypeInterface;
use LogicException;
use Psr\Http\Message\ServerRequestInterface;

class ImplicitGrant extends AbstractAuthorizeGrant
{
    /** @var DateInterval */
    private $accessTokenTTL;

    /** @var string */
    private $queryDelimiter;

    /**
     * @param DateInterval $accessTokenTTL
     * @param string       $queryDelimiter
     */
    public function __construct(DateInterval $accessTokenTTL, $queryDelimiter = '#')
    {
        $this->accessTokenTTL = $accessTokenTTL;
        $this->queryDelimiter = $queryDelimiter;
    }

    /**
     * @param DateInterval $refreshTokenTTL
     *
     * @throw LogicException
     */
    public function setRefreshTokenTTL(DateInterval $refreshTokenTTL)
    {
        throw new LogicException('The Implicit Grant does not return refresh tokens');
    }

    /**
     * @param RefreshTokenRepositoryInterface $refreshTokenRepository
     *
     * @throw LogicException
     */
    public function setRefreshTokenRepository(RefreshTokenRepositoryInterface $refreshTokenRepository)
    {
        throw new LogicException('The Implicit Grant does not return refresh tokens');
    }

    /**
     * {@inheritdoc}
     */
    public function canRespondToAccessTokenRequest(ServerRequestInterface $request)
    {
        return false;
    }

    /**
     * Return the grant identifier that can be used in matching up requests.
     *
     * @return string
     */
    public function getIdentifier()
    {
        return 'implicit';
    }

    /**
     * Respond to an incoming request.
     *
     * @param ServerRequestInterface $request
     * @param ResponseTypeInterface  $responseType
     * @param DateInterval           $accessTokenTTL
     *
     * @return ResponseTypeInterface
     */
    public function respondToAccessTokenRequest(
        ServerRequestInterface $request,
        ResponseTypeInterface $responseType,
        DateInterval $accessTokenTTL,
    ) {
        throw new LogicException('This grant does not used this method');
    }

    /**
     * {@inheritdoc}
     */
    public function canRespondToAuthorizationRequest(ServerRequestInterface $request)
    {
        return (
            isset($request->getQueryParams()['response_type'])
            && $request->getQueryParams()['response_type'] === 'token'
            && isset($request->getQueryParams()['client_id'])
        );
    }

    /**
     * {@inheritdoc}
     */
    public function validateAuthorizationRequest(ServerRequestInterface $request)
    {
        $clientId = $this->getQueryStringParameter(
            'client_id',
            $request,
            $this->getServerParameter('PHP_AUTH_USER', $request)
        );

        if (\is_null($clientId)) {
            throw OAuthServerException::invalidRequest('client_id');
        }

        $client = $this->getClientEntityOrFail($clientId, $request);

        $redirectUri = $this->getQueryStringParameter('redirect_uri', $request);

        if ($redirectUri !== null) {
            if (!\is_string($redirectUri)) {
                throw OAuthServerException::invalidRequest('redirect_uri');
            }

            $this->validateRedirectUri($redirectUri, $client, $request);
        } elseif (\is_array($client->getRedirectUri()) && \count($client->getRedirectUri()) !== 1
            || empty($client->getRedirectUri())) {
            $this->getEmitter()->emit(new RequestEvent(RequestEvent::CLIENT_AUTHENTICATION_FAILED, $request));
            throw OAuthServerException::invalidClient($request);
        } else {
            $redirectUri = \is_array($client->getRedirectUri())
                ? $client->getRedirectUri()[0]
                : $client->getRedirectUri();
        }

        $scopes = $this->validateScopes(
            $this->getQueryStringParameter('scope', $request, $this->defaultScope),
            $redirectUri
        );

        $stateParameter = $this->getQueryStringParameter('state', $request);

        if ($stateParameter !== null && !\is_string($stateParameter)) {
            throw OAuthServerException::invalidRequest('state');
        }

        $authorizationRequest = new AuthorizationRequest();
        $authorizationRequest->setGrantTypeId($this->getIdentifier());
        $authorizationRequest->setClient($client);
        $authorizationRequest->setRedirectUri($redirectUri);

        if ($stateParameter !== null) {
            $authorizationRequest->setState($stateParameter);
        }

        $authorizationRequest->setScopes($scopes);

        return $authorizationRequest;
    }

    /**
     * {@inheritdoc}
     */
    public function completeAuthorizationRequest(AuthorizationRequest $authorizationRequest)
    {
        if ($authorizationRequest->getUser() instanceof UserEntityInterface === false) {
            throw new LogicException('An instance of UserEntityInterface should be set on the AuthorizationRequest');
        }

        $finalRedirectUri = ($authorizationRequest->getRedirectUri() === null)
            ? \is_array($authorizationRequest->getClient()->getRedirectUri())
                ? $authorizationRequest->getClient()->getRedirectUri()[0]
                : $authorizationRequest->getClient()->getRedirectUri()
            : $authorizationRequest->getRedirectUri();

        // The user approved the client, redirect them back with an access token
        if ($authorizationRequest->isAuthorizationApproved() === true) {
            // Finalize the requested scopes
            $finalizedScopes = $this->scopeRepository->finalizeScopes(
                $authorizationRequest->getScopes(),
                $this->getIdentifier(),
                $authorizationRequest->getClient(),
                $authorizationRequest->getUser()->getIdentifier()
            );

            $accessToken = $this->issueAccessToken(
                $this->accessTokenTTL,
                $authorizationRequest->getClient(),
                $authorizationRequest->getUser()->getIdentifier(),
                $finalizedScopes
            );

            $response = new RedirectResponse();
            $response->setRedirectUri(
                $this->makeRedirectUri(
                    $finalRedirectUri,
                    [
                        'access_token' => (string) $accessToken,
                        'token_type'   => 'Bearer',
                        'expires_in'   => $accessToken->getExpiryDateTime()->getTimestamp() - \time(),
                        'state'        => $authorizationRequest->getState(),
                    ],
                    $this->queryDelimiter
                )
            );

            return $response;
        }

        // The user denied the client, redirect them back with an error
        throw OAuthServerException::accessDenied(
            'The user denied the request',
            $this->makeRedirectUri(
                $finalRedirectUri,
                [
                    'state' => $authorizationRequest->getState(),
                ]
            )
        );
    }
}
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