<?php

namespace Auth\OAuth2;

use Auth\OAuth2;

// Reference Material
// https://dev.bitly.com/v4_documentation.html

class Bitly extends OAuth2
{

    /**
     * @var string
     */
    private $endpoint = 'https://bitly.com/oauth/';

    /**
     * @var string
     */
    private $resourceEndpoint = 'https://api-ssl.bitly.com/';

    /**
     * @var array
     */
    protected $scopes = [];

    /**
     * @var array
     */
    protected $user = [];

    /**
     * @return string
     */
    public function getName():string
    {
        return 'bitly';
    }

    /**
     * @return string
     */
    public function getLoginURL():string
    {
        return $this->endpoint . 'authorize?'.
            http_build_query([
                'client_id' => $this->appID,
                'redirect_uri' => $this->callback,
                'state' => json_encode($this->state)
            ]);
    }

    /**
     * @param string $code
     *
     * @return string
     */
    public function getAccessToken(string $code):string
    {
        $response = $this->request(
            'POST',
            $this->resourceEndpoint . 'oauth/access_token',
            ["Content-Type: application/x-www-form-urlencoded"],
            http_build_query([
                "client_id" => $this->appID,
                "client_secret" => $this->appSecret,
                "code" => $code,
                "redirect_uri" => $this->callback,
                "state" => json_encode($this->state)
            ])
        );

        $result = null;

        if ($response) {
            parse_str($response, $result);
            return $result['access_token'];
        }

        return '';
    }

    /**
     * @param $accessToken
     *
     * @return string
     */
    public function getUserID(string $accessToken):string
    {
        $user = $this->getUser($accessToken);

        if (isset($user['login'])) {
            return $user['login'];
        }

        return '';
    }

    /**
     * @param $accessToken
     *
     * @return string
     */
    public function getUserEmail(string $accessToken):string
    {
        $user = $this->getUser($accessToken);

        if (isset($user['emails'])) {
            return $user['emails'][0]['email'];
        }

        return '';
    }

    /**
     * @param $accessToken
     *
     * @return string
     */
    public function getUserName(string $accessToken):string
    {
        $user = $this->getUser($accessToken);

        if (isset($user['name'])) {
            return $user['name'];
        }

        return '';
    }

    /**
     * @param string $accessToken
     *
     * @return array
     */
    protected function getUser(string $accessToken)
    {
        $headers = [
            'Authorization: Bearer '. urlencode($accessToken),
            "Accept: application/json"
        ];

        if (empty($this->user)) {
            $this->user = json_decode($this->request('GET', $this->resourceEndpoint . "v4/user", $headers), true);
        }


        return $this->user;
    }
}
