package weChat

import (
	"context"
	"errors"
	"github.com/wechatpay-apiv3/wechatpay-go/core"
	"github.com/wechatpay-apiv3/wechatpay-go/core/option"
	"github.com/wechatpay-apiv3/wechatpay-go/services/refunddomestic"
	"github.com/wechatpay-apiv3/wechatpay-go/utils"
	"hospital-open-api/config"
	"path/filepath"
)

type RefundRequest struct {
	TransactionId      string `json:"transaction_id" comment:"微信订单号"`
	OutTradeNo         string `json:"out_trade_no" comment:"商户订单号"`
	OutRefundNo        string `json:"out_refund_no" comment:"退款订单号"`
	Reason             string `json:"reason" comment:"退款原因"`
	PaymentAmountTotal int64  `json:"payment_amount_total" comment:"退款金额"`
	NotifyUrl          string `json:"notify_url" comment:"回调地址"`
}

// Refund 退款
func (r RefundRequest) Refund() (*refunddomestic.Refund, 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
	certsDir := filepath.Join("extend/weChat/certs", "/1636644248/apiclient_key.pem")
	mchPrivateKey, err := utils.LoadPrivateKeyWithPath(certsDir)
	if err != nil {
		return nil, errors.New("微信签名生成失败")
	}

	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(config.C.Wechat.MchId, config.C.Wechat.MchCertificateSerialNumber, mchPrivateKey, config.C.Wechat.V3ApiSecret),
	}

	client, err := core.NewClient(ctx, opts...)
	if err != nil {
		return nil, errors.New(err.Error())
	}

	refundRequest := refunddomestic.CreateRequest{
		TransactionId: core.String(r.TransactionId),
		OutTradeNo:    core.String(r.OutTradeNo),
		OutRefundNo:   core.String(r.OutRefundNo),
		Reason:        core.String(r.Reason),
		NotifyUrl:     core.String(r.NotifyUrl),
		Amount: &refunddomestic.AmountReq{
			Currency: core.String("CNY"),
			Refund:   core.Int64(r.PaymentAmountTotal),
			Total:    core.Int64(r.PaymentAmountTotal),
		},
	}

	svc := refunddomestic.RefundsApiService{Client: client}
	resp, _, err := svc.Create(ctx, refundRequest)
	if err != nil {
		return nil, errors.New(err.Error())
	}

	return resp, nil
}