<?php

namespace OAuth\OAuth2\Service;

use OAuth\OAuth2\Token\StdOAuth2Token;
use OAuth\Common\Http\Exception\TokenResponseException;
use OAuth\Common\Http\Uri\Uri;
use OAuth\Common\Consumer\CredentialsInterface;
use OAuth\Common\Http\Client\ClientInterface;
use OAuth\Common\Storage\TokenStorageInterface;
use OAuth\Common\Http\Uri\UriInterface;

class Vkontakte extends AbstractService
{
    /**
     * Defined scopes
     *
     * @link http://vk.com/dev/permissions
     */
    const SCOPE_NOTIFY        = 'notify';
    const SCOPE_FRIENDS       = 'friends';
    const SCOPE_PHOTOS        = 'photos';
    const SCOPE_AUDIO         = 'audio';
    const SCOPE_VIDEO         = 'video';
    const SCOPE_DOCS          = 'docs';
    const SCOPE_NOTES         = 'notes';
    const SCOPE_PAGES         = 'pages';
    const SCOPE_APP_LINK      = '';
    const SCOPE_STATUS        = 'status';
    const SCOPE_OFFERS        = 'offers';
    const SCOPE_QUESTIONS     = 'questions';
    const SCOPE_WALL          = 'wall';
    const SCOPE_GROUPS        = 'groups';
    const SCOPE_MESSAGES      = 'messages';
    const SCOPE_NOTIFICATIONS = 'notifications';
    const SCOPE_STATS         = 'stats';
    const SCOPE_ADS           = 'ads';
    const SCOPE_OFFLINE       = 'offline';
    const SCOPE_NOHTTPS       = 'nohttps';

    public function __construct(
        CredentialsInterface $credentials,
        ClientInterface $httpClient,
        TokenStorageInterface $storage,
        $scopes = array(),
        UriInterface $baseApiUri = null
    ) {
        parent::__construct($credentials, $httpClient, $storage, $scopes, $baseApiUri);

        if (null === $baseApiUri) {
            $this->baseApiUri = new Uri('https://api.vk.com/method/');
        }
    }

    /**
     * {@inheritdoc}
     */
    public function getAuthorizationEndpoint()
    {
        return new Uri('https://oauth.vk.com/authorize');
    }

    /**
     * {@inheritdoc}
     */
    public function getAccessTokenEndpoint()
    {
        return new Uri('https://oauth.vk.com/access_token');
    }

    /**
     * {@inheritdoc}
     */
    protected function parseAccessTokenResponse($responseBody)
    {
        $data = json_decode($responseBody, true);

        if (null === $data || !is_array($data)) {
            throw new TokenResponseException('Unable to parse response.');
        } elseif (isset($data['error'])) {
            throw new TokenResponseException('Error in retrieving token: "' . $data['error'] . '"');
        }

        $token = new StdOAuth2Token();
        $token->setAccessToken($data['access_token']);
        $token->setLifeTime($data['expires_in']);

        if (isset($data['refresh_token'])) {
            $token->setRefreshToken($data['refresh_token']);
            unset($data['refresh_token']);
        }

        unset($data['access_token']);
        unset($data['expires_in']);

        $token->setExtraParams($data);

        return $token;
    }
    
    /**
     * {@inheritdoc}
     */
    protected function getAuthorizationMethod()
    {
        return static::AUTHORIZATION_METHOD_QUERY_STRING;
    }
}