<?php

/*
 * This file is part of Phraseanet
 *
 * (c) 2005-2016 Alchemy
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Alchemy\Phrasea\Authentication\Provider;

use Alchemy\Phrasea\Authentication\Provider\Token\Token;
use Alchemy\Phrasea\Authentication\Provider\Token\Identity;
use Alchemy\Phrasea\Authentication\Exception\NotAuthenticatedException;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\Routing\Generator\UrlGenerator;
use Symfony\Component\HttpFoundation\Session\SessionInterface;

class Facebook extends AbstractProvider
{
    /** @var \Facebook\Facebook */
    private $facebook;

    public function __construct(\Facebook\Facebook $facebook, UrlGenerator $generator, SessionInterface $session)
    {
        $this->facebook = $facebook;
        $this->generator = $generator;
        $this->session = $session;
    }

    /**
     * {@inheritdoc}
     */
    public function getId()
    {
        return 'facebook';
    }

    /**
     * {@inheritdoc}
     */
    public function getName()
    {
        return 'Facebook';
    }

    /**
     * {@inheritdoc}
     */
    public function authenticate(array $params = array())
    {
        $params = array_merge(['providerId' => $this->getId()], $params);

        return new RedirectResponse(
            $this->facebook->getRedirectLoginHelper()->getLoginUrl(
                $this->generator->generate(
                    'login_authentication_provider_callback',
                    $params,
                    UrlGenerator::ABSOLUTE_URL
                ),
                ['email']
            )
        );
    }

    /**
     * {@inheritdoc}
     */
    public function logout()
    {
        $this->session->remove('fb_access_token');
    }

    /**
     * @param \Facebook\Facebook $facebook
     *
     * @return Facebook
     */
    public function setFacebook(\Facebook\Facebook $facebook)
    {
        $this->facebook = $facebook;

        return $this;
    }

    /**
     * @return \Facebook\Facebook
     */
    public function getFacebook()
    {
        return $this->facebook;
    }

    /**
     * @param $dataToRetrieve
     * @return \Facebook\GraphNodes\GraphUser
     */
    protected function getGraphUser($dataToRetrieve)
    {
        try {
            $response = $this->facebook->get(
                "/me?fields=" . implode(',', $dataToRetrieve),
                $this->session->get('fb_access_token')
            );
        } catch(\Facebook\Exceptions\FacebookResponseException $e) {
            throw new NotAuthenticatedException('Graph returned an error: ' . $e->getMessage());
            exit;
        } catch(\Facebook\Exceptions\FacebookSDKException $e) {
            throw new NotAuthenticatedException('Facebook SDK returned an error: ' . $e->getMessage());
            exit;
        }

        if (!$response)
        {
            throw new NotAuthenticatedException('Not authenticated');
        }

        return $response->getGraphUser();
    }

    /**
     * {@inheritdoc}
     */
    public function getIdentity()
    {
        $user = $this->getGraphUser(['id', 'name', 'email', 'picture', 'last_name', 'first_name']);
        
        $identity = new Identity();

        $identity->set(Identity::PROPERTY_ID, $user['id']);
        $identity->set(Identity::PROPERTY_IMAGEURL, $user['picture']);
        $identity->set(Identity::PROPERTY_EMAIL, $user['email']);
        $identity->set(Identity::PROPERTY_FIRSTNAME, $user['first_name']);
        $identity->set(Identity::PROPERTY_LASTNAME, $user['last_name']);
        $identity->set(Identity::PROPERTY_USERNAME, $user['first_name']);

        return $identity;
    }

    /**
     * {@inheritdoc}
     */
    public function onCallback(Request $request)
    {
        $helper = $this->facebook->getRedirectLoginHelper();

        try {
            $accessToken = $helper->getAccessToken();
        } catch(\Facebook\Exceptions\FacebookResponseException $e) {
            throw new NotAuthenticatedException('Graph returned an error: ' . $e->getMessage());
            exit;
        } catch(\Facebook\Exceptions\FacebookSDKException $e) {
            throw new NotAuthenticatedException('Facebook SDK returned an error: ' . $e->getMessage());
            exit;
        }

        if (! isset($accessToken)) {
            if ($helper->getError()) {
                $error  = "Error: " . $helper->getError() . "\n";
                $error .= "Error Code: " . $helper->getErrorCode() . "\n";
                $error .= "Error Reason: " . $helper->getErrorReason() . "\n";
                $error .= "Error Description: " . $helper->getErrorDescription() . "\n";

                throw new NotAuthenticatedException($error);

            } else {
                throw new NotAuthenticatedException('Facebook authentication failed');
            }
            exit;
        }

        $oAuth2Client = $this->facebook->getOAuth2Client();

        if (! $accessToken->isLongLived()) {
            try {
                $accessToken = $oAuth2Client->getLongLivedAccessToken($accessToken);
            } catch (\Facebook\Exceptions\FacebookSDKException $e) {
                throw new NotAuthenticatedException('Error getting long-lived access token: ' . $e->getMessage() );
                exit;
            }
        }
        $this->session->set('fb_access_token', (string) $accessToken);
    }

    /**
     * {@inheritdoc}
     */
    public function getToken()
    {
        $user = $this->getGraphUser(['id']);

        return new Token($this, $user['id']);
    }

    /**
     * {@inheritdoc}
     */
    public function getIconURI()
    {
        return 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADEAAAAwCAYAAAC4w'
            . 'JK5AAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAA2hpVFh0W'
            . 'E1MOmNvbS5hZG9iZS54bXAAAAAAADw/eHBhY2tldCBiZWdpbj0i77u/IiBpZD0iV'
            . 'zVNME1wQ2VoaUh6cmVTek5UY3prYzlkIj8+IDx4OnhtcG1ldGEgeG1sbnM6eD0iY'
            . 'WRvYmU6bnM6bWV0YS8iIHg6eG1wdGs9IkFkb2JlIFhNUCBDb3JlIDUuMy1jMDExI'
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            . 'W50YXgtbnMjIj4gPHJkZjpEZXNjcmlwdGlvbiByZGY6YWJvdXQ9IiIgeG1sbnM6e'
            . 'G1wTU09Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC9tbS8iIHhtbG5zOnN0U'
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            . 'E1NOk9yaWdpbmFsRG9jdW1lbnRJRD0ieG1wLmRpZDowMjgwMTE3NDA3MjA2ODExO'
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            . 'J3x2y7FV8iEPbOzKCYsISDedA/AbEZb+N3SVAPtbfVF96UHp+Hdx8Gi8129Q4F8K'
            . 'SoARU6Knr/+Ylu+nTmxtySInm8jcPvBKzF5wmYBkYhiotT8wG8UC/POEjEhbz7h9'
            . '9yw71wUE86LuDQQSzHBBDIhswD0eS4XyoRJPeJfMstlQmApbqGmmKTAXjomBAU2d'
            . '3uE838QE1xgYNsgZMnJpwzhYuXkSEmanKw1kBNNiJxyXNbMbg2Y4BxZQJMWE34gm'
            . 'NCYYHJjYi2GWKpf7JmdJCb85QTimHBWOpi01Q7fjB1yhUWF4jHWMQmt89lb20Q3t'
            . 'WBwMnIDHJQdTqdEd9/OMrKT+EXrntTbLL8QRD+s0b4n1zHAhpRYcqGGipqZ83NTk'
            . '+kXj2gdAZzNeEshPSqKQuvtm8DZG25E245WA87uZDxKJICz7UtMDKN9RxtTPRdpM'
            . 'kw79OP5eTo4O5RqhECYLgMzrp/kr6Z65KS7J8FFSyzQFmuU/kkl72fW9ZVM/yPAA'
            . 'LuRXOCVA9oFAAAAAElFTkSuQmCC';
    }

    /**
     * {@inheritdoc}
     *
     * @return Facebook
     */
    public static function create(UrlGenerator $generator, SessionInterface $session, array $options)
    {
        $config['app_id'] = $options['app-id'];
        $config['app_secret'] = $options['secret'];
        $config['default_graph_version'] = $options['default-graph-version'];

        $facebook = new \Facebook\Facebook($config);

        return new static($facebook, $generator, $session);
    }
}
