package pay

import (
	"context"
	"errors"
	"time"

	"github.com/go-pay/gopay"
	"github.com/go-pay/gopay/wechat/v3"
)

// get js pay prepay id
func (client *Client) WeChat_JSApiPayRequest(ctx context.Context, payerOpenID, orderNo, title string, price, amount int64, notifyUrl string) (*wechat.JSAPIPayParams, error) {
	expire := time.Now().Add(10 * time.Minute).Format(time.RFC3339)
	// 初始化 BodyMap
	bm := make(gopay.BodyMap)

	bm.
		Set("sp_appid", client.conf.WechatAppId).
		Set("sp_mchid", client.conf.WechatMechID).
		Set("sub_mchid", client.conf.WechatSubMechID).
		Set("description", title).
		Set("out_trade_no", orderNo).
		Set("time_expire", expire).
		Set("notify_url", notifyUrl).
		SetBodyMap("amount", func(bm gopay.BodyMap) {
			if amount == 0 {
				amount = 1
			}

			bm.
				Set("total", amount).
				Set("currency", "CNY")
		}).
		SetBodyMap("payer", func(bm gopay.BodyMap) {
			bm.Set("sp_openid", payerOpenID)
		})

	resp, err := client.WeChat.V3TransactionJsapi(ctx, bm)
	if err != nil {
		return nil, err
	}

	if resp.Code != 0 {
		return nil, errors.New("获取预支付ID失败")
	}

	return client.WeChat.PaySignOfJSAPI(client.conf.WechatAppId, resp.Response.PrepayId)
}