<?php

namespace Base\OAuthClientBundle\EventListener;

use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorage;

class RequestListener
{

    /**
     * @var TokenStorage
     */
    protected $securityTokenStorage;

    /**
     * @var string
     */
    protected $client_id;
    
    /**
     * @var string
     */
    protected $client_secret;
    
    /**
     * @var string
     */
    protected $access_token_url;


    /**
     * @param TokenStorage $securityTokenStorage
     * @param string $client_id
     * @param string $client_secret
     * @param string $access_token_url
     */
    public function __construct(TokenStorage $securityTokenStorage, $client_id, $client_secret, $access_token_url)
    {
        $this->securityTokenStorage = $securityTokenStorage;
        $this->client_id = $client_id;
        $this->client_secret = $client_secret;
        $this->access_token_url = $access_token_url;
    }

    /**
     * @param GetResponseEvent $event
     * 
     * @return type
     */
    public function onKernelRequest(GetResponseEvent $event)
    {
        if (!$event->isMasterRequest()) {
            return;
        }

        $token = $this->securityTokenStorage->getToken();
        if ($token && method_exists($token, 'isExpired') && $token->isExpired()) {
            $parameters = array(
                'refresh_token' => $token->getRefreshToken(),
                'grant_type' => 'refresh_token',
                'client_id' => $this->client_id,
                'client_secret' => $this->client_secret
            );
            
            $curl = curl_init();
            curl_setopt_array($curl, array(
                CURLOPT_RETURNTRANSFER => 1,
                CURLOPT_URL => $this->access_token_url . '?' . http_build_query($parameters, '', '&')
            ));
            $response = curl_exec($curl);
            curl_close($curl);

            $newToken = json_decode($response, true);
            
            if (isset($newToken['access_token']) && isset($newToken['refresh_token']) && isset($newToken['expires_in'])) {
                $token->setAccessToken($newToken['access_token']);
                $token->setRefreshToken($newToken['refresh_token']);
                $token->setExpiresIn($newToken['expires_in']);
                
                $this->securityTokenStorage->setToken($token);
            }
        }
        
        return;
    }

}