package services

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"github.com/wechatpay-apiv3/wechatpay-go/core"
	"github.com/wechatpay-apiv3/wechatpay-go/core/option"
	"github.com/wechatpay-apiv3/wechatpay-go/services/payments/jsapi"
	"github.com/wechatpay-apiv3/wechatpay-go/services/payments/native"
	payUtils "github.com/wechatpay-apiv3/wechatpay-go/utils"
	"hongze/hongze_web_mfyx/models"
	"hongze/hongze_web_mfyx/models/order"
	"hongze/hongze_web_mfyx/utils"
	"log"
	"time"
)

const (
	MchPKFileName              = "../hongze_mfyx/utils/cert/apiclient_key.pem"
	Mchid                      = "1624495680"
	MchCertificateSerialNumber = "5ED2719CFAE5205763034AD80BF4B8A33533C418"
	MchAPIv3Key                = "W1tbnzQrzQ7yRRNuQCIHjis8dgdasKVX"
)

// 微信商户建立连接
func getWechatClient() (context.Context, *core.Client, 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 := payUtils.LoadPrivateKeyWithPath(MchPKFileName)
	if err != nil {
		log.Print("load merchant private key error")
		return nil, nil, 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(Mchid, MchCertificateSerialNumber, mchPrivateKey, MchAPIv3Key),
	}

	client, err := core.NewClient(ctx, opts...)
	if err != nil {
		log.Printf("new wechat pay client err:%s", err)
		return nil, nil, err
	}
	return ctx, client, nil
}

// 生成预支付交易单
func ExampleJsapiApiServicePrepay(orderDetail *order.CygxOrder, unionId string) (JsapiApiResp order.PrepayWithRequestPaymentResponse, err error) {
	//var err error
	defer func() {
		if err != nil {
			fmt.Println(err)
			go utils.SendAlarmMsg(fmt.Sprint("生成预支付交易单失败 ExampleJsapiApiServicePrepay, err：", err.Error(), "unionId:", unionId), 2)
		}
	}()

	userRecord, e := models.GetUserRecordByUnionId(unionId)
	if e != nil && e.Error() != utils.ErrNoRow() {
		err = errors.New("GetUserRecordByUnionId, Err: " + e.Error())
		return
	}
	ctx, client, err := getWechatClient()
	if err != nil {
		log.Printf("getWechatClientt err:%s", err)
		return
	}
	svc := jsapi.JsapiApiService{Client: client}
	// 得到prepay_id，以及调起支付所需的参数和签名
	resp, _, err := svc.PrepayWithRequestPayment(ctx,
		jsapi.PrepayRequest{
			Appid:       core.String(utils.WxAppId),
			Mchid:       core.String(Mchid),
			Description: core.String(orderDetail.SourceTitle),
			OutTradeNo:  core.String(orderDetail.OrderCode),
			Attach:      core.String(""),
			NotifyUrl:   core.String(utils.WxPayJsapiNotifyUrl),
			Amount: &jsapi.Amount{
				Total: core.Int64(int64(orderDetail.OrderMoney * 100)), // 分
			},
			Payer: &jsapi.Payer{
				Openid: core.String(userRecord.OpenId),
			},
		},
	)
	JsapiApiResp.PrepayId = *resp.PrepayId
	JsapiApiResp.Appid = *resp.Appid
	JsapiApiResp.TimeStamp = *resp.TimeStamp
	JsapiApiResp.NonceStr = *resp.NonceStr
	JsapiApiResp.Package = *resp.Package
	JsapiApiResp.SignType = *resp.SignType
	JsapiApiResp.PaySign = *resp.PaySign
	return
}

//func init() {
//	ExampleNativeApiService_Prepay()
//}

func ExampleNativeApiServicePrepay(orderDetail *order.CygxOrder) (codeUrl string, err error) {
	defer func() {
		if err != nil {
			fmt.Println(err)
			go utils.SendAlarmMsg(fmt.Sprint("生成预支付交易单失败 ExampleNativeApiServicePrepay, err：", err.Error(), "OrderCode:", orderDetail.OrderCode), 2)
		}
	}()
	//如果是试用卡，商品名称就显示日卡月卡，如果是单场付费就显示，单场活动名称
	if orderDetail.OrderType == 1 {
		orderDetail.SourceTitle = "畅读" + orderDetail.GoodsName
	}
	ctx, client, _ := getWechatClient()
	svc := native.NativeApiService{Client: client}
	resp, _, err := svc.Prepay(ctx,
		native.PrepayRequest{
			Appid:         core.String(utils.WxAppId),
			Mchid:         core.String(Mchid),
			Description:   core.String(orderDetail.SourceTitle),
			OutTradeNo:    core.String(orderDetail.OutTradeNo),
			TimeExpire:    core.Time(time.Now().Add(10 * time.Minute)),
			Attach:        core.String(""),
			NotifyUrl:     core.String(utils.WxPayJsapiNotifyUrl),
			GoodsTag:      core.String(""),
			SupportFapiao: core.Bool(false),
			Amount: &native.Amount{
				Currency: core.String("CNY"),
				Total:    core.Int64(int64(orderDetail.OrderMoney * 100)), // 分
			},
		},
	)

	if err != nil {
		return
	}
	codeUrl = *resp.CodeUrl
	return
}

type WechatPayCallback struct {
	MchID          string    `json:"mchid"`
	AppID          string    `json:"appid"`
	OutTradeNo     string    `json:"out_trade_no"`
	TransactionID  string    `json:"transaction_id"`
	TradeType      string    `json:"trade_type"`
	TradeState     string    `json:"trade_state"`
	TradeStateDesc string    `json:"trade_state_desc"`
	BankType       string    `json:"bank_type"`
	Attach         string    `json:"attach"`
	SuccessTime    time.Time `json:"success_time"`
	Payer          struct {
		OpenID string `json:"openid"`
	} `json:"payer"`
	Amount struct {
		Total         int    `json:"total"`
		PayerTotal    int    `json:"payer_total"`
		Currency      string `json:"currency"`
		PayerCurrency string `json:"payer_currency"`
	} `json:"amount"`
}

// 微信支付回调内容解密
func WxDecodeNotify(body []byte) (wechatPayCallback *WechatPayCallback) {
	var err error
	defer func() {
		if err != nil {
			fmt.Println(err)
			go utils.SendAlarmMsg(fmt.Sprint("微信支付回调内容解密失败 WxDecodeNotify, err：", err.Error()), 2)
		}
	}()

	var prepaymap map[string]interface{}
	_ = json.Unmarshal(body, &prepaymap)

	var prepaymap2 = prepaymap["resource"].(map[string]interface{})
	nonce := prepaymap2["nonce"].(string)
	associatedData := prepaymap2["associated_data"].(string)
	ciphertext := prepaymap2["ciphertext"].(string)

	tx, e := payUtils.DecryptAES256GCM(MchAPIv3Key, associatedData, nonce, ciphertext)
	if e != nil {
		log.Println(err)
		return
	}
	if e != nil {
		err = errors.New("DecryptAES256GCM, Err: " + e.Error())
		return
	}
	var datamap *WechatPayCallback
	_ = json.Unmarshal([]byte(tx), &datamap)
	wechatPayCallback = datamap
	return
}