<?php

namespace OAuth\OAuth2\Service;

use OAuth\OAuth2\Service\AbstractService;
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 SalesforceService extends AbstractService
{
    /**
     * Scopes
     *
     * @var string
     */
    const   SCOPE_API           =   'api',
            SCOPE_REFRESH_TOKEN =   'refresh_token';

    /**
     * {@inheritdoc}
     */
    public function getAuthorizationEndpoint()
    {
        return new Uri('https://login.salesforce.com/services/oauth2/authorize');
    }

    /**
     * {@inheritdoc}
     */
    public function getAccessTokenEndpoint()
    {
        return new Uri('https://na1.salesforce.com/services/oauth2/token');
    }

    /**
     * {@inheritdoc}
     */
    protected function parseRequestTokenResponse($responseBody)
    {
        parse_str($responseBody, $data);

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

        return $this->parseAccessTokenResponse($responseBody);
    }

    /**
     * {@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']);
        // Salesforce tokens evidently never expire...
        $token->setEndOfLife(StdOAuth2Token::EOL_NEVER_EXPIRES);
        unset($data['access_token']);

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

        $token->setExtraParams($data);

        return $token;
    }

    /**
     * {@inheritdoc}
     */
    protected function getExtraOAuthHeaders()
    {
        return array('Accept' => 'application/json');
    }
}