package qyweixin

import (
	"bytes"
	"context"
	"crypto/tls"
	"errors"
	"fmt"
	butil "git.u8t.cn/open/gosdk/util"
	log "github.com/sirupsen/logrus"
	"github.com/smbrave/goutil"
	"github.com/spf13/cast"
	"github.com/wechatpay-apiv3/wechatpay-go/core"
	"github.com/wechatpay-apiv3/wechatpay-go/core/option"
	"github.com/wechatpay-apiv3/wechatpay-go/utils"
	"io/ioutil"
	"net/http"
	"os"
	"time"
)

type PayReq struct {
	TotalAmount int64
	Title       string
	Openid      string
	BillNo      string
}

type PayConfig struct {
	Corpid       string
	Secret       string
	Agent        string
	CertPem      string
	KeyPem       string
	MchId        string
	ApiKey       string
	SerialNumber string
}

type AppPay struct {
	App
	cli       *core.Client
	tlsClient *http.Client
	stdClient *http.Client
	config    *PayConfig
}

func NewAppPay(cfg *PayConfig) *AppPay {
	payCertPem, _ := os.ReadFile(cfg.CertPem)
	payKeyPem, _ := os.ReadFile(cfg.KeyPem)

	pay := &AppPay{}
	client, err := pay.withCert(payCertPem, payKeyPem)
	if err != nil {
		log.Errorf("with cert error :%s", err.Error())
		return nil
	}
	pay.tlsClient = client

	pay.App = *NewApp(&AppConfig{Corpid: cfg.Corpid, Secret: cfg.Secret, Agent: cfg.Agent})
	pay.config = cfg
	return pay
}

// 附着商户证书
func (c *AppPay) withCert(cert, key []byte) (*http.Client, error) {
	tlsCert, err := tls.X509KeyPair(cert, key)
	if err != nil {
		return nil, err
	}

	conf := &tls.Config{
		Certificates: []tls.Certificate{tlsCert},
	}
	trans := &http.Transport{
		TLSClientConfig: conf,
	}

	return &http.Client{
		Transport: trans,
	}, nil

}

// 发送请求
func (c *AppPay) post(url string, params butil.Params, tls bool) ([]byte, error) {
	var httpc *http.Client
	if tls {
		if c.tlsClient == nil {
			return nil, errors.New("tls wepay is not initialized")
		}
		httpc = c.tlsClient
	} else {
		httpc = c.stdClient
	}
	buf := bytes.NewBuffer(params.Encode())
	resp, err := httpc.Post(url, "application/xml; charset=utf-8", buf)
	if err != nil {
		return nil, err
	}

	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}
	return body, nil
}

func (w *AppPay) initPay() error {
	// 使用 utils 提供的函数从本地文件中加载商户私钥，商户私钥会用来生成请求的签名
	mchPrivateKey, err := utils.LoadPrivateKeyWithPath(w.config.KeyPem)
	if err != nil {
		return err
	}
	ctx := context.Background()
	// 使用商户私钥等初始化 client，并使它具有自动定时获取微信支付平台证书的能力
	opts := []core.ClientOption{
		option.WithWechatPayAutoAuthCipher(w.config.MchId, w.config.SerialNumber, mchPrivateKey, w.config.ApiKey),
	}
	client, err := core.NewClient(ctx, opts...)
	if err != nil {
		return err
	}
	w.cli = client
	return nil
}

func (p *AppPay) PayMoney(req *PayReq) error {
	if p.cli == nil {
		if err := p.initPay(); err != nil {
			return err
		}
	}

	param := butil.NewParams()

	if req.BillNo == "" {
		req.BillNo = fmt.Sprintf("QY%s", time.Now().Format("20060102150405"))
	}
	param.Set("nonce_str", goutil.RandomStr(32))
	param.Set("mch_billno", req.BillNo)
	param.Set("mch_id", p.config.MchId)
	param.Set("wxappid", p.config.Corpid)
	param.Set("agentid", p.config.Agent)
	param.Set("re_openid", req.Openid)
	param.Set("total_amount", cast.ToString(req.TotalAmount))
	param.Set("wishing", req.Title)
	param.Set("act_name", "企业红包")
	param.Set("remark", "企业红包")
	param.Set("workwx_sign", param.QySignMd5(p.config.Secret))
	param.Set("sign", param.SignMd5(p.config.ApiKey))

	reqUrl := "https://api.mch.weixin.qq.com/mmpaymkttransfers/sendworkwxredpack"
	rspBody, err := p.post(reqUrl, param, true)
	if err != nil {
		log.Errorf("Post [%s] [%s] error :%s", reqUrl, string(param.Encode()), err.Error())
		return err
	}

	respParam := butil.NewParams()
	respParam.Decode(rspBody)

	returnCode := respParam.GetString("return_code")
	resultCoce := respParam.GetString("result_code")
	if resultCoce == "SUCCESS" && returnCode == "SUCCESS" {
		return nil
	}
	return errors.New(string(respParam.Encode()))
}