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package order_preview
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import (
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"github.com/gin-gonic/gin"
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"github.com/shopspring/decimal"
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"log"
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"recook/internal/back"
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"recook/internal/dbc"
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"recook/internal/model/coupon"
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"recook/internal/model/order_preview"
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"recook/tools"
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"time"
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)
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type QueryCouponAvailableRequest struct {
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UserID uint `json:"userId"`
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PreOrderID uint `json:"preOrderId"`
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}
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type QueryResponse struct {
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Total int `json:"total"`
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List couponList `json:"list"`
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}
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type couponList struct {
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// 当前订单可用的优惠券， 就是告诉c端页面可以选择
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Available []Available `json:"available"`
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// 当前订单[不]可用的优惠券， 就是告诉c端页面可以选择
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NotAvailable []coupon.ReceiverMid `json:"notAvailable"`
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}
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type Available struct {
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coupon.ReceiverMid
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Selected bool `json:"select"`
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}
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// 查询针对当前订单，返回可用的优惠券/所有优惠券
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func QueryCouponAvailable(c *gin.Context) {
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defer func() {
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if err := recover(); err != nil {
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log.Println("服务器出错:", err)
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back.Fail(c, "服务器出错")
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return
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}
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}()
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var p QueryCouponAvailableRequest
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if err := tools.ParseParams(&p, c); err != nil {
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back.Fail(c, err.Error())
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return
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}
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// 查找当前用户的所有"可用"的优惠券
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var userReceiverMids []coupon.ReceiverMid
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dbc.DB.Order("id desc").Find(&userReceiverMids, "user_id = ? AND status = 0 AND end_time > ?", p.UserID, time.Now())
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// 初始化返回参数
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var qr = QueryResponse{
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Total: len(userReceiverMids),
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List: couponList{},
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}
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if len(userReceiverMids) < 1 {
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back.Suc(c, "没有优惠券可用", &qr)
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return
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}
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var orderDetail order_preview.Information
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if err := dbc.DB.Find(&orderDetail, p.PreOrderID).Error; err != nil {
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back.Fail(c, "没有此订单")
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return
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}
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// 查找preOrder信息: 订单现在所选的
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var orderCoupons []struct {
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CouponID uint `gorm:"column:coupon_id"`
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BrandID uint `gorm:"column:brand_id"`
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}
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dbc.DB.Model(&coupon.ReceiverMid{}).Select("coupon_id").Where("order_id = ?", p.PreOrderID).Scan(&orderCoupons)
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// 判断订单货物详情
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var orderGoods []order_preview.GoodsDetail
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dbc.DB.Find(&orderGoods, p.PreOrderID)
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// 品牌id =》 总价的 一个map
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var brandMap = make(map[uint]decimal.Decimal)
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for _, orderGood := range orderGoods {
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brandMap[orderGood.BrandID] = orderGood.GoodsAmount
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}
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//判断两个信息， 是不是同一个牌子，是否达到可抵扣的起点
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// 标记当前能用，和当前选择的
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var availableList = make([]Available, 0, 0)
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var notAvailableList = make([]coupon.ReceiverMid, 0, 0)
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// only one can be selected
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var selectIt = true
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for _, userReceiverMid := range userReceiverMids {
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// 这里的orderCoupons 按照继峰说法，其实只有一个
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for _, orderCoupon := range orderCoupons {
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// 1、当前已选
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if selectIt || orderCoupon.CouponID == userReceiverMid.CouponID {
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availableList = append(availableList, Available{
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ReceiverMid: userReceiverMid,
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Selected: true,
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})
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// 只有一张优惠券，选中后，短路，下次不再进入这个循环
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selectIt = false
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goto LabelDone
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}
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}
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// 2、判断是否是可以被当前订单使用
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if v, ok := brandMap[userReceiverMid.BrandID]; (userReceiverMid.BrandID == 0 && orderDetail.GoodsTotalAmount.GreaterThan(decimal.NewFromInt(int64(userReceiverMid.Threshold)))) ||
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(ok && v.GreaterThan(decimal.NewFromInt(int64(userReceiverMid.Threshold)))) {
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// 品牌是否不受限制，
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// 或者是否在order的商品中，且领的券没有门槛金额，或者门槛金额小于订单的该品牌货物金额
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availableList = append(availableList, Available{
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ReceiverMid: userReceiverMid,
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Selected: false,
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})
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continue
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}
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// 3、无法被使用的扔进 notAvaiList
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notAvailableList = append(notAvailableList, userReceiverMid)
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LabelDone:
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}
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// 拼接数据 返回数据
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qr.List = couponList{
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availableList,
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notAvailableList,
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}
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back.Suc(c, "操作成功", qr)
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return
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}
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