<?php
/**
 * 微信支付
 */

namespace utils;


use think\facade\Db;
use WeChatPay\Builder;
use WeChatPay\Util\PemUtil;

class WxPay
{
    protected static $instance = null;
    protected $conf;

    public function __construct ()
    {
        $this->conf = Db::name('pay_config')->field('mchid,secret,client_cert,client_key,wx_appid_app')->find(['channel' => 2]);
        self::$instance = Builder::factory([
            // 商户号
            'mchid' => $this->conf['mchid'],
            // 商户证书序列号
            'serial' => '1DDE55AD98ED71D6EDD4A4A16996DE7B47773A8C',
            // 商户API私钥 PEM格式的文本字符串或者文件resource
            'privateKey' => PemUtil::loadPrivateKey($this->conf['client_key']),
            'certs' => [
                // 可由内置的平台证书下载器 `./bin/CertificateDownloader.php` 生成
                '70A461D25B263BC673B2D9DE98BA8E5706820409' => PemUtil::loadCertificate($this->conf['client_cert'])
            ],
        ]);
    }

    /**
     * 微信下单
     * @param array $param
     * @return array
     */
    public function unifiedOrder (array $param)
    {
        try {
            $resp = self::$instance->chain('v3/pay/transactions/app')->post(['json' => [
                'mchid' => $this->conf['mchid'],
                'out_trade_no' => $param['out_trade_no'],
                'appid' => $this->conf['wx_appid_app'],
                'description' => $param['body'],
                'notify_url' => env('app.base_url') . 'payResult/wechat', // 支付通知地址,
                'amount' => [
                    'total' => $param['total_amount'],
                    'currency' => 'CNY'
                ],
            ]]);
            return ['flag' => true, 'msg' => '调用成功', 'data' => json_decode($resp->getBody())];
        } catch (\Throwable $e) {
            return ['flag' => false, 'msg' => "调用失败，" . $e->getMessage() . PHP_EOL];
        }
    }

    public function checkSign ()
    {
    }
}