<?php

class GDK_Payjs
{
    private $mchid;
    private $key;
    private $api_url_native;
    private $api_url_cashier;
    private $api_url_mweb;
    private $api_url_check;

    public function __construct($config = null)
    {
        if (!$config) {
            exit('config needed');
        }

        $this->mchid = $config['mchid'];
        $this->key = $config['key'];
        $api_url = $config['api_url'] ?? 'https://payjs.cn/api/';
        $this->api_url_native = $api_url.'native';
        $this->api_url_cashier = $api_url.'cashier';
        $this->api_url_mweb = $api_url.'mweb';
        $this->api_url_close = $api_url.'close';
        $this->api_url_check = $api_url.'check';
    }

    // 扫码支付
    public function native(array $data)
    {
        $this->url = $this->api_url_native;

        return $this->post($data);
    }

    // MWEB(H5) 支付
    public function mweb(array $data)
    {
        $this->url = $this->api_url_mweb;

        return $this->post($data);
    }

    // 收银台模式
    public function cashier(array $data)
    {
        $this->url = $this->api_url_cashier;
        $data = $this->sign($data);

        return $this->url.'?'.http_build_query($data);
    }

    // 检查订单
    public function check($payjs_order_id)
    {
        $this->url = $this->api_url_check;
        $data = ['payjs_order_id' => $payjs_order_id];

        return $this->post($data);
    }

    // 异步通知接收
    public function notify()
    {
        $data = $_POST;
        if (true === $this->checkSign($data)) {
            return $data;
        }

        exit('验签失败');
    }

    // 数据签名
    public function sign(array $data)
    {
        $data['mchid'] = $this->mchid;
        array_filter($data);
        ksort($data);
        $data['sign'] = strtoupper(md5(urldecode(http_build_query($data).'&key='.$this->key)));

        return $data;
    }

    // 校验数据签名
    public function checkSign($data)
    {
        $in_sign = $data['sign'];
        unset($data['sign']);
        array_filter($data);
        ksort($data);
        $sign = strtoupper(md5(urldecode(http_build_query($data).'&key='.$this->key)));

        return $in_sign == $sign ? true : false;
    }

    // 数据发送
    public function post($data)
    {
        $data = $this->sign($data);
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS);
        curl_setopt($ch, CURLOPT_URL, $this->url);
        curl_setopt($ch, CURLOPT_USERAGENT, 'HTTP CLIENT');
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
        $rst = curl_exec($ch);
        curl_close($ch);

        return json_decode($rst, true);
    }
}