<?php

namespace App\Servers\WeChat;

class WeixinServer
{

    /**
     * 单列对象
     * @var
     */
    private static $server = '';

    public $appid = '';
    public $appsecret = '';

    private function __construct(){

        $this->appid=env('WX_APPID','');
        $this->appsecret=env('WX_APPSECRET','');
    }

    /**
     * 创建对象
     * @return WeixinServer
     */
    static function creatServer()
    {
        if(empty(self::$server)){
            self::$server = new WeixinServer();
        }
        return self::$server;
    }

    /**
     * 网页授权
     * @return mixed
     */
    function authorize()
    {
        $code = request()->input('code', '');
        if (empty($code)) {
            $redirect_url = $this->getServerUrl();
            $url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid={$this->appid}&redirect_uri={$redirect_url}&response_type=code&scope=snsapi_base&state=STATE#wechat_redirect";
            $this->redirect($url);
            return false;
        } else {
            $url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid={$this->appid}&secret={$this->appsecret}&code={$code}&grant_type=authorization_code";
            $result = $this->sendRequest($url);
            $result = json_decode($result, true);
            if (isset($result['errcode'])) {
                return false;
            } else {
//                $openid = $result['openid'];
//                $access_token = $result['access_token'];
//                $url = "https://api.weixin.qq.com/sns/oauth2/refresh_token?appid={$this->appid}&grant_type=refresh_token&refresh_token={$result['refresh_token']} ";
//                $result = $this->sendRequest($url);
//                $result = json_decode($result, true);
//                if (isset($result['access_token'])) {
//                    $access_token = $result['access_token'];
//                    $openid = $result['openid'];
//                }
//                $url = "https://api.weixin.qq.com/sns/userinfo?access_token={$access_token}&openid={$openid}&lang=zh_CN";
//                $result = $this->sendRequest($url);
//                $result = json_decode($result, true);
//                if (isset($result['errcode'])) {
//                    return false;
//                }
                return $result;
            }
        }

    }

    /**
     * 获取当前连接
     * @return string
     */
    function getServerUrl()
    {
        return urlencode('http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']);
    }


    function redirect($uri = '', $method = 'location', $http_response_code = 302)
    {
        if (!preg_match('#^https?://#i', $uri)) {
            $uri = site_url($uri);
        }
        switch ($method) {
            case 'refresh'    :
                header("Refresh:0;url=" . $uri);
                break;
            default            :
                header("Location: " . $uri, TRUE, $http_response_code);
                break;
        }
        exit();
    }

    /**
     * @param $url
     * @param string $type 请求方式
     * @param string $data 数据 数组格式
     * @return mixed
     */
    protected function sendRequest($url, $type = 'get', $data = '')
    {

        $ch = curl_init();
        if ($type == 'get' && $data) {
            $url = $url . '?' . http_build_query($data);
        }
        curl_setopt($ch, CURLOPT_URL, $url); //设置访问路径
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE); //设置可以返回字符串
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        $head = array('User-Agent:Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36');
        curl_setopt($ch, CURLOPT_HTTPHEADER, $head);
        if ($type == 'post') {
            curl_setopt($ch, CURLOPT_POST, TRUE);//post请求
            $data = json_encode($data, JSON_UNESCAPED_UNICODE);
            curl_setopt($ch, CURLOPT_POSTFIELDS, $data);//设置传递的参数
        }
        $request = curl_exec($ch);
        curl_close($ch);
        return $request;
    }
}