<?php namespace RVR\Controller;

use DateTime;
use RVR\PersistentData\Model\OAuthToken;
use RVR\PersistentData\Model\User;
use RVR\Repository\OAuthClientRepository;
use SokoWeb\Interfaces\Authentication\IAuthenticationRequired;
use SokoWeb\Interfaces\Request\IRequest;
use SokoWeb\Interfaces\Response\IRedirect;
use SokoWeb\Response\Redirect;
use SokoWeb\PersistentData\PersistentDataManager;
use SokoWeb\Response\HtmlContent;

class OAuthAuthController implements IAuthenticationRequired
{
    private IRequest $request;

    private PersistentDataManager $pdm;

    private OAuthClientRepository $oAuthClientRepository;

    public function __construct(IRequest $request)
    {
        $this->request = $request;
        $this->pdm = new PersistentDataManager();
        $this->oAuthClientRepository = new OAuthClientRepository();
    }

    public function isAuthenticationRequired(): bool
    {
        return true;
    }

    public function auth()
    {
        $redirectUri = $this->request->query('redirect_uri');
        $clientId = $this->request->query('client_id');
        $scope = $this->request->query('scope') ? $this->request->query('scope'): '';
        $state = $this->request->query('state');
        $nonce = $this->request->query('nonce') ? $this->request->query('nonce'): '';

        if (!$clientId || !$redirectUri || !$state) {
            return new HtmlContent('oauth/oauth_error', ['error' => 'An invalid request was made. Please start authentication again.']);
        }

        $client = $this->oAuthClientRepository->getByClientId($clientId);
        if ($client === null) {
            return new HtmlContent('oauth/oauth_error', ['error' => 'Client is not authorized.']);
        }

        $redirectUriParsed = parse_url($redirectUri);
        $redirectUriBase = $redirectUriParsed['scheme'] . '://' . $redirectUriParsed['host'] . $redirectUriParsed['path'];
        $redirectUriQuery = [];
        if (isset($redirectUriParsed['query'])) {
            parse_str($redirectUriParsed['query'], $redirectUriQuery);
        }

        if (!in_array($redirectUriBase, $client->getRedirectUrisArray())) {
            return new HtmlContent('oauth/oauth_error', ['error' => 'Redirect URI \'' . $redirectUriBase .'\' is not allowed for this client.']);
        }

        /**
        * @var ?User $user
        */
        $user = $this->request->user();
        $code = bin2hex(random_bytes(16));
        $accessToken = bin2hex(random_bytes(16));

        $token = new OAuthToken();
        $token->setNonce($nonce);
        $token->setScope($scope);
        $token->setUser($user);
        $token->setCode($code);
        $token->setAccessToken($accessToken);
        $token->setCreatedDate(new DateTime());
        $token->setExpiresDate(new DateTime('+5 minutes'));
        $this->pdm->saveToDb($token);

        $redirectUriQuery = array_merge($redirectUriQuery, [
            'state' => $state,
            'code' => $code
        ]);
        $finalRedirectUri = $redirectUriBase . '?' . http_build_query($redirectUriQuery);

        return new Redirect($finalRedirectUri, IRedirect::TEMPORARY);
    }
}