<?php
/**
 * Created by PhpStorm.
 * User: kongqi
 * Date: 2019/4/21
 * Time: 6:13
 */

namespace App\ServicePay\Usdtpay;

class Usdtpay
{
    protected $token;//token
    protected $mch_id;//商户号
    protected $config;
    static public $instance;//声明一个静态变量（保存在类中唯一的一个实例）

    private function __construct($config)
    {
        $this->token = $config['token'];
        $this->mch_id = $config['mch_id'];
        $this->config = $config;

    }

    public static function make($config)
    {
        if (!self::$instance) self::$instance = new self($config);
        return self::$instance;
    }

    public function makeSign($request, $salt = '')
    {
        $signStr = $request['pickupUrl'];
        $signStr .= $request['receiveUrl'];
        $signStr .= $request['signType'];
        $signStr .= $request['orderNo'];
        $signStr .= $request['orderAmount'];
        $signStr .= $request['orderCurrency'];
        $signStr .= $request['customerId'];
        $signStr .= $salt;

        return strtolower(md5($signStr));
    }

    public function notifySign($request, $salt = '')
    {
        $signStr = $request['signType'];
        $signStr .= $request['orderNo'];
        $signStr .= $request['orderAmount'];
        $signStr .= $request['orderCurrency'];
        $signStr .= $request['transactionId'];
        $signStr .= $request['status'];
        $signStr .= $request['token'];
        $signStr .= $salt;
        return md5($signStr);
    }

    public function orderBuy($pay_data)
    {
        $request = [
            'orderNo' => $pay_data['orderNo'], //商户订单号，最大长度60个字符
            'customerId' => $pay_data['customerId'], //客户交易者账号
            'orderCurrency' => $pay_data['orderCurrency'], //订单币种，固定值：USDT或CNY
            'orderAmount' => $pay_data['orderAmount'], //订单金额，USDT单位为个，CNY单位为元
            'receiveUrl' => $this->config['notify_url'], //  通知回调地址
            'pickupUrl' => $this->config['return_url'] . '?orderNo=' . $pay_data['orderNo'], //  交易完成后跳转URL
            'signType' => 'MD5', //固定值不要改
        ];

        $sign = $this->makeSign($request, $this->token);  //签名

        $request['sign'] = $sign;
        $url = $this->config['url'] . '?' . http_build_query($request); //访问链接

        return ['redirect_url' => $url];
    }

    public function checkSign($para)
    {
        $para['token'] = $this->token;
        $sign = $this->notifySign($para);
        if ($sign === $para['sign']) {
            return true;
        }
        return false;
    }
}