package myPay

import (
	"context"
	"errors"
	"github.com/go-pay/gopay"
	"github.com/go-pay/gopay/wechat/v3"
	"net/http"
	"time"
)

type Wechat struct {
	ctx           context.Context
	cli           *wechat.ClientV3
	params        *WechatPayV3Impl
	orderNo       string
	amount        int
	description   string
	notifyUrl     string
	profitSharing bool
}

func NewWechat(params *WechatPayV3Impl) *Wechat {
	// NewClientV3 初始化微信客户端 v3
	//	mchid：商户ID 或者服务商模式的 sp_mchid
	// 	serialNo：商户证书的证书序列号
	//	apiV3Key：apiV3Key，商户平台获取
	//	privateKey：私钥 apiclient_key.pem 读取后的内容
	client, err := wechat.NewClientV3(params.MchId, params.SerialNo, params.ApiV3Key, params.PKContent)
	if err != nil {
		panic(err.Error())
	}

	// 设置微信平台API证书和序列号（推荐开启自动验签，无需手动设置证书公钥等信息）
	//client.SetPlatformCert([]byte(""), "")

	// 启用自动同步返回验签，并定时更新微信平台API证书（开启自动验签时，无需单独设置微信平台API证书和序列号）
	client.SetPlatformCert([]byte(params.WxPkContent), params.WxPkSerialNo)
	// 启用自动同步返回验签，并定时更新微信平台API证书
	//err = client.AutoVerifySign()
	//if err != nil {
	//	return nil, err
	//}

	// 打开Debug开关，输出日志，默认是关闭的
	if params.IsProd {
		client.DebugSwitch = gopay.DebugOff
	} else {
		client.DebugSwitch = gopay.DebugOn
	}

	return &Wechat{params: params, cli: client, ctx: context.Background()}
}

func (t *Wechat) GetCli() *wechat.ClientV3 {
	return t.cli
}

func (t *Wechat) SetCommonConfig(notifyUrl string) *Wechat {
	t.notifyUrl = notifyUrl
	return t
}

func (t *Wechat) SetOrderInfo(orderNo string, amount int, description string) *Wechat {
	t.orderNo = orderNo
	t.amount = amount
	t.description = description
	return t
}

func (t *Wechat) setBodyMap() gopay.BodyMap {
	if t.description == "" || t.orderNo == "" || t.notifyUrl == "" {
		panic("param is empty")
	}
	if t.amount == 0 {
		panic("amount is zero")
	}

	bm := make(gopay.BodyMap)
	bm.Set("description", t.description).
		Set("out_trade_no", t.orderNo).
		Set("time_expire", time.Now().Add(10*time.Minute).Format(time.RFC3339)).
		Set("notify_url", t.notifyUrl).
		SetBodyMap("amount", func(bm gopay.BodyMap) {
			bm.Set("total", t.amount).Set("currency", "CNY")
		})
	if t.profitSharing {
		bm.SetBodyMap("settle_info", func(bm gopay.BodyMap) {
			bm.Set("profit_sharing", true)
		})
	}

	return bm
}

func (t *Wechat) SetProfitSharing(b bool) *Wechat {
	t.profitSharing = b
	return t
}

func (t *Wechat) GetApp() (*wechat.AppPayParams, error) {
	wxRsp, err := t.cli.V3TransactionApp(t.ctx, t.setBodyMap().Set("appid", t.params.AppAppid))
	if err != nil {
		return nil, err
	}

	if wxRsp.Code == wechat.Success {
		//校验签名
		if err2 := wechat.V3VerifySignByPK(wxRsp.SignInfo.HeaderTimestamp, wxRsp.SignInfo.HeaderNonce, wxRsp.SignInfo.SignBody, wxRsp.SignInfo.HeaderSignature, t.cli.WxPublicKey()); err != nil {
			return nil, err2
		}

		//获取调起参数
		return t.cli.PaySignOfApp(t.params.AppAppid, wxRsp.Response.PrepayId)
	} else {
		return nil, errors.New(wxRsp.Error)
	}
}

func (t *Wechat) GetJsapi(openId string) (*wechat.JSAPIPayParams, error) {
	wxRsp, err := t.cli.V3TransactionJsapi(t.ctx,
		t.setBodyMap().Set("appid", t.params.MpAppid).SetBodyMap("payer", func(bm gopay.BodyMap) {
			bm.Set("openid", openId)
		}),
	)
	if err != nil {
		return nil, err
	}
	if wxRsp.Code == wechat.Success {
		//校验签名
		if err2 := wechat.V3VerifySignByPK(wxRsp.SignInfo.HeaderTimestamp, wxRsp.SignInfo.HeaderNonce, wxRsp.SignInfo.SignBody, wxRsp.SignInfo.HeaderSignature, t.cli.WxPublicKey()); err != nil {
			return nil, err2
		}

		//获取调起参数
		return t.cli.PaySignOfJSAPI(t.params.MpAppid, wxRsp.Response.PrepayId)
	} else {
		return nil, errors.New(wxRsp.Error)
	}
}

func (t *Wechat) GetJsapiForMini(openId string) (*wechat.JSAPIPayParams, error) {
	wxRsp, err := t.cli.V3TransactionJsapi(t.ctx,
		t.setBodyMap().Set("appid", t.params.MiniAppid).SetBodyMap("payer", func(bm gopay.BodyMap) {
			bm.Set("openid", openId)
		}),
	)
	if err != nil {
		return nil, err
	}

	if wxRsp.Code == wechat.Success {
		//校验签名
		if err2 := wechat.V3VerifySignByPK(wxRsp.SignInfo.HeaderTimestamp, wxRsp.SignInfo.HeaderNonce, wxRsp.SignInfo.SignBody, wxRsp.SignInfo.HeaderSignature, t.cli.WxPublicKey()); err != nil {
			return nil, err2
		}

		//获取调起参数
		return t.cli.PaySignOfJSAPI(t.params.MiniAppid, wxRsp.Response.PrepayId)
	} else {
		return nil, errors.New(wxRsp.Error)
	}
}

func (t *Wechat) GetNative() (*wechat.Native, error) {
	wxRsp, err := t.cli.V3TransactionNative(t.ctx, t.setBodyMap().Set("appid", t.params.MpAppid))
	if err != nil {
		return nil, err
	}

	if wxRsp.Code == wechat.Success {
		//校验签名
		if err2 := wechat.V3VerifySignByPK(wxRsp.SignInfo.HeaderTimestamp, wxRsp.SignInfo.HeaderNonce, wxRsp.SignInfo.SignBody, wxRsp.SignInfo.HeaderSignature, t.cli.WxPublicKey()); err != nil {
			return nil, err2
		}

		//获取调起参数
		return wxRsp.Response, err
	} else {
		return nil, errors.New(wxRsp.Error)
	}
}

func (t *Wechat) GetH5(ip string, appName string, appUrl string) (*wechat.H5Url, error) {
	wxRsp, err := t.cli.V3TransactionH5(t.ctx, t.setBodyMap().Set("appid", t.params.MpAppid).SetBodyMap("scene_info", func(bm gopay.BodyMap) {
		bm.Set("payer_client_ip", ip)
		bm.SetBodyMap("h5_info", func(bm gopay.BodyMap) {
			bm.Set("type", "Wap")
			bm.Set("app_url", appUrl)
			bm.Set("app_name", appName)
		})
	}))

	if err != nil {
		return nil, err
	}

	if wxRsp.Code == wechat.Success {
		//校验签名
		if err2 := wechat.V3VerifySignByPK(wxRsp.SignInfo.HeaderTimestamp, wxRsp.SignInfo.HeaderNonce, wxRsp.SignInfo.SignBody, wxRsp.SignInfo.HeaderSignature, t.cli.WxPublicKey()); err != nil {
			return nil, err2
		}

		//获取调起参数
		return wxRsp.Response, nil
	} else {
		return nil, errors.New(wxRsp.Error)
	}
}

func (t *Wechat) Notify(req *http.Request) (*WechatNotifyResp, error) {
	notifyReq, err := wechat.V3ParseNotify(req)
	if err != nil {
		return nil, errors.New("解析回调失败")
	}

	err = notifyReq.VerifySignByPK(t.cli.WxPublicKey())
	if err != nil {
		return nil, errors.New("sign Error")
	}

	if notifyReq.EventType == "TRANSACTION.SUCCESS" {
		result, err := notifyReq.DecryptPayCipherText(t.params.ApiV3Key)
		if err != nil {
			return nil, errors.New("解密错误")
		} else {
			return &WechatNotifyResp{resp: result}, nil
		}
	}

	return nil, errors.New(notifyReq.EventType)
}

func (t *Wechat) GetOrderNo() string {
	return t.orderNo
}

func (t *Wechat) GetAmount() int {
	return t.amount
}

func NotifySuccess(msg string) (int, *wechat.V3NotifyRsp) {
	return http.StatusOK, &wechat.V3NotifyRsp{Code: gopay.SUCCESS, Message: msg}
}

func NotifyFail(msg string) (int, *wechat.V3NotifyRsp) {
	return http.StatusBadRequest, &wechat.V3NotifyRsp{Code: gopay.FAIL, Message: msg}
}

type WechatPayV3Impl struct {
	MpAppid      string
	AppAppid     string
	MiniAppid    string
	MchId        string
	ApiV3Key     string
	SerialNo     string
	PKContent    string
	WxPkSerialNo string
	WxPkContent  string
	IsProd       bool
}