<?php

namespace AuthBundle\Services;

use Buzz\Listener\BasicAuthListener;

class AccessTokenService
{

    /**
     * @var string
     */
    private $client_id;

    /**
     * @var string
     */
    private $client_secret;

    /**
     * @var string
     */
    private $access_token_url;

    /**
     * @var string
     */
    private $user_info_url;


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

    /**
     * @param string $username
     * @param string $password
     * 
     * @return array
     */
    public function getToken($username, $password)
    {
        $token = @json_decode(file_get_contents("/tmp/." . base64_encode($username . ":" . $password)), true);
        if (!isset($token["access_token"])) {
            $body = [
                'grant_type' => 'password',
                'username' => $username,
                'password' => $password,
            ];
            $token = $this->updateToken($username, $password, $body);
        }

        if (isset($token["expires_at"]) && $token["expires_at"] <= time()) {
            $body = [
                'grant_type' => 'refresh_token',
                'refresh_token' => $token['refresh_token'],
            ];
            $token = $this->updateToken($username, $password, $body);
        }

        return $token;
    }

    /**
     * @param string $username
     * @param string $password
     * 
     * @return array
     */
    public function getUserInfo($username, $password)
    {
        $auth_info = array();
        $token = $this->getToken($username, $password);
        if (!isset($token["user_info"]) && isset($token["token_type"]) && isset($token["access_token"])) {
            $auth_info = $this->updateUserInfo($username, $password, $token);
        } elseif (isset($token["user_info"])) {
            $auth_info = $token["user_info"];
        }

        return $auth_info;
    }

    /**
     * @param string $username
     * @param string $password
     * @param array $body
     * 
     * @return array
     */
    private function updateToken($username, $password, $body)
    {
        $browser = new \Buzz\Browser();
        $listener = new BasicAuthListener($this->client_id, $this->client_secret);
        $browser->addListener($listener);
        $response = $browser->post($this->access_token_url, ['Content-Type' => 'application/x-www-form-urlencoded'], http_build_query($body));
        $token = json_decode($response->getContent(), true);
        $token["expires_at"] = time() + (isset($token['expires_in']) ? $token['expires_in'] : 3600);
        file_put_contents("/tmp/." . base64_encode($username . ":" . $password), json_encode($token));

        return $token;
    }

    /**
     * @param string $username
     * @param string $password
     * @param array $token
     * 
     * @return array
     */
    private function updateUserInfo($username, $password, $token)
    {
        $auth_info = $this->requestUserInfo(ucfirst($token["token_type"]) . " " . $token["access_token"]);
        $token["user_info"] = $auth_info;
        file_put_contents("/tmp/." . base64_encode($username . ":" . $password), json_encode($token));

        return $auth_info;
    }
    
    /**
     * @param string $authorization
     * 
     * @return array
     */
    public function requestUserInfo($authorization)
    {
        $oauth_headers = [
            "Authorization" => $authorization,
        ];
        $browser = new \Buzz\Browser();
        $response = $browser->get($this->user_info_url, $oauth_headers);
        
        return json_decode($response->getContent(), true);
    }

}