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This commit is contained in:
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55e22086e8
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@ -9,6 +9,7 @@ import (
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"bindbox-game/internal/pkg/core"
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"bindbox-game/internal/pkg/validation"
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"bindbox-game/internal/repository/mysql/model"
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"gorm.io/gorm/clause"
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)
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// ==================== 用户次数卡 API ====================
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@ -197,8 +198,9 @@ func (h *handler) GetGamePassPackages() core.HandlerFunc {
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// ==================== 购买套餐 API ====================
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type purchasePackageRequest struct {
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PackageID int64 `json:"package_id" binding:"required"`
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Count int32 `json:"count"` // 购买数量
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PackageID int64 `json:"package_id" binding:"required"`
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Count int32 `json:"count"` // 购买数量
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CouponIDs []int64 `json:"coupon_ids"` // 优惠券ID列表
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}
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type purchasePackageResponse struct {
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@ -208,7 +210,7 @@ type purchasePackageResponse struct {
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// PurchaseGamePassPackage 购买次数卡套餐（创建订单）
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// @Summary 购买次数卡套餐
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// @Description 购买次数卡套餐，创建订单等待支付
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// @Description 购买次数卡套餐，创建订单等待支付，支持使用优惠券
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// @Tags APP端.用户
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// @Accept json
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// @Produce json
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@ -245,7 +247,7 @@ func (h *handler) PurchaseGamePassPackage() core.HandlerFunc {
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// Calculate total price
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totalPrice := pkg.Price * int64(req.Count)
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// 创建订单
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// 创建订单 (支持优惠券)
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now := time.Now()
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orderNo := now.Format("20060102150405") + fmt.Sprintf("%04d", now.UnixNano()%10000)
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order := &model.Orders{
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@ -255,11 +257,33 @@ func (h *handler) PurchaseGamePassPackage() core.HandlerFunc {
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TotalAmount: totalPrice,
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ActualAmount: totalPrice,
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Status: 1, // 待支付
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Remark: fmt.Sprintf("game_pass_package:%s|count:%d", pkg.Name, req.Count),
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Remark: fmt.Sprintf("game_pass_package:%s|pkg_id:%d|count:%d", pkg.Name, pkg.ID, req.Count),
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CreatedAt: now,
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UpdatedAt: now,
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}
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// 应用优惠券 (如果有)
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var appliedCouponVal int64
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var couponID int64
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if len(req.CouponIDs) > 0 {
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couponID = req.CouponIDs[0]
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// 调用优惠券应用函数
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applied, err := h.applyCouponToGamePassOrder(ctx, order, userID, couponID)
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if err != nil {
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ctx.AbortWithError(core.Error(http.StatusBadRequest, code.ServerError, err.Error()))
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return
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}
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appliedCouponVal = applied
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// 记录优惠券到订单
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if appliedCouponVal > 0 {
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order.CouponID = couponID
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order.Remark += fmt.Sprintf("|coupon:%d", couponID)
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}
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}
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// 保存订单
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if err := h.writeDB.Orders.WithContext(ctx.RequestContext()).
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Omit(h.writeDB.Orders.PaidAt, h.writeDB.Orders.CancelledAt).
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Create(order); err != nil {
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@ -267,14 +291,222 @@ func (h *handler) PurchaseGamePassPackage() core.HandlerFunc {
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return
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}
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// 在备注中记录套餐ID和数量
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remark := fmt.Sprintf("%s|pkg_id:%d|count:%d", order.Remark, pkg.ID, req.Count)
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h.writeDB.Orders.WithContext(ctx.RequestContext()).
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Where(h.writeDB.Orders.ID.Eq(order.ID)).
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Updates(map[string]any{"remark": remark})
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// 如果使用了优惠券,记录到order_coupons表
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if appliedCouponVal > 0 {
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_ = h.writeDB.OrderCoupons.WithContext(ctx.RequestContext()).UnderlyingDB().Exec(
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"INSERT IGNORE INTO order_coupons (order_id, user_coupon_id, applied_amount, created_at) VALUES (?,?,?,NOW(3))",
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order.ID, couponID, appliedCouponVal)
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}
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// 处理0元订单
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if order.ActualAmount == 0 {
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order.Status = 2
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order.PaidAt = now
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h.writeDB.Orders.WithContext(ctx.RequestContext()).
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Where(h.writeDB.Orders.OrderNo.Eq(orderNo)).
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Updates(map[string]any{
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h.writeDB.Orders.Status.ColumnName().String(): 2,
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h.writeDB.Orders.PaidAt.ColumnName().String(): now,
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})
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// 0元订单确认优惠券扣减
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if appliedCouponVal > 0 {
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h.confirmCouponUsage(ctx, couponID, order.ID, now)
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}
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}
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res.OrderNo = order.OrderNo
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res.Message = "订单创建成功，请完成支付"
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ctx.Payload(res)
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}
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}
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// ==================== 优惠券辅助函数 ====================
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// applyCouponToGamePassOrder 应用优惠券到次卡购买订单
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// 返回应用的优惠金额 (分)
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func (h *handler) applyCouponToGamePassOrder(ctx core.Context, order *model.Orders, userID int64, userCouponID int64) (int64, error) {
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// 使用 SELECT ... FOR UPDATE 锁定行
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uc, _ := h.writeDB.UserCoupons.WithContext(ctx.RequestContext()).
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Clauses(clause.Locking{Strength: "UPDATE"}).
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Where(
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h.writeDB.UserCoupons.ID.Eq(userCouponID),
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h.writeDB.UserCoupons.UserID.Eq(userID),
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).First()
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if uc == nil {
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return 0, nil
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}
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// 检查状态 (必须是可用状态)
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if uc.Status != 1 {
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return 0, fmt.Errorf("优惠券不可用")
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}
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// 获取优惠券模板
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sc, _ := h.readDB.SystemCoupons.WithContext(ctx.RequestContext()).
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Where(h.readDB.SystemCoupons.ID.Eq(uc.CouponID), h.readDB.SystemCoupons.Status.Eq(1)).
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First()
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now := time.Now()
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if sc == nil {
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return 0, fmt.Errorf("优惠券模板不存在")
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}
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// 验证有效期
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if uc.ValidStart.After(now) {
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return 0, fmt.Errorf("优惠券未到开始时间")
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}
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if !uc.ValidEnd.IsZero() && uc.ValidEnd.Before(now) {
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return 0, fmt.Errorf("优惠券已过期")
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}
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// 验证使用范围 (次卡购买只支持全场券 scope_type=1)
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if sc.ScopeType != 1 {
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return 0, fmt.Errorf("次卡购买仅支持全场通用优惠券")
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}
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// 验证门槛
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if order.TotalAmount < sc.MinSpend {
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return 0, fmt.Errorf("未达优惠券使用门槛")
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}
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// 50% 封顶
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cap := order.TotalAmount / 2
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remainingCap := cap - order.DiscountAmount
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if remainingCap <= 0 {
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return 0, fmt.Errorf("已达优惠封顶限制")
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}
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// 计算优惠金额
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applied := int64(0)
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switch sc.DiscountType {
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case 1: // 金额券
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bal := uc.BalanceAmount
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if bal > 0 {
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if bal > remainingCap {
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applied = remainingCap
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} else {
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applied = bal
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}
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}
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case 2: // 满减券
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applied = sc.DiscountValue
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if applied > remainingCap {
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applied = remainingCap
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}
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case 3: // 折扣券
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rate := sc.DiscountValue
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if rate < 0 {
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rate = 0
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}
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if rate > 1000 {
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rate = 1000
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}
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newAmt := order.ActualAmount * rate / 1000
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d := order.ActualAmount - newAmt
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if d > remainingCap {
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applied = remainingCap
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} else {
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applied = d
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}
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}
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if applied > order.ActualAmount {
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applied = order.ActualAmount
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}
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if applied <= 0 {
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return 0, nil
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}
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// 更新订单金额
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order.ActualAmount -= applied
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order.DiscountAmount += applied
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// 扣减优惠券余额或标记为冻结
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if sc.DiscountType == 1 {
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// 金额券：直接扣余额
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newBal := uc.BalanceAmount - applied
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newStatus := int32(1)
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if newBal <= 0 {
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newBal = 0
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newStatus = 2 // 已使用
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}
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res := h.writeDB.UserCoupons.WithContext(ctx.RequestContext()).UnderlyingDB().Exec(
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"UPDATE user_coupons SET balance_amount = ?, status = ? WHERE id = ?",
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newBal, newStatus, userCouponID)
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if res.Error != nil {
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return 0, res.Error
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}
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// 记录流水
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_ = h.writeDB.UserCouponLedger.WithContext(ctx.RequestContext()).Create(&model.UserCouponLedger{
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UserID: userID,
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UserCouponID: userCouponID,
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ChangeAmount: -applied,
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BalanceAfter: newBal,
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OrderID: order.ID,
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Action: "reserve", // 预扣
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CreatedAt: time.Now(),
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})
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} else {
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// 满减/折扣券：标记为冻结 (状态4)
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res := h.writeDB.UserCoupons.WithContext(ctx.RequestContext()).UnderlyingDB().Exec(
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"UPDATE user_coupons SET status = 4 WHERE id = ? AND status = 1", userCouponID)
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if res.Error != nil {
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return 0, res.Error
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}
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if res.RowsAffected == 0 {
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return 0, fmt.Errorf("优惠券已被使用")
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}
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// 记录流水
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_ = h.writeDB.UserCouponLedger.WithContext(ctx.RequestContext()).Create(&model.UserCouponLedger{
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UserID: userID,
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UserCouponID: userCouponID,
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ChangeAmount: 0,
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BalanceAfter: 0,
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OrderID: order.ID,
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Action: "reserve",
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CreatedAt: time.Now(),
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})
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}
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return applied, nil
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}
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// confirmCouponUsage 确认优惠券使用 (支付成功后调用)
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func (h *handler) confirmCouponUsage(ctx core.Context, userCouponID int64, orderID int64, paidAt time.Time) {
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uc, _ := h.readDB.UserCoupons.WithContext(ctx.RequestContext()).
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Where(h.readDB.UserCoupons.ID.Eq(userCouponID)).
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First()
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if uc == nil {
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return
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}
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sc, _ := h.readDB.SystemCoupons.WithContext(ctx.RequestContext()).
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Where(h.readDB.SystemCoupons.ID.Eq(uc.CouponID)).
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First()
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if sc == nil {
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return
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}
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// 金额券：余额已经扣减,只需记录used_order_id
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if sc.DiscountType == 1 {
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_, _ = h.writeDB.UserCoupons.WithContext(ctx.RequestContext()).
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Where(h.writeDB.UserCoupons.ID.Eq(userCouponID)).
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Updates(map[string]any{
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h.writeDB.UserCoupons.UsedOrderID.ColumnName().String(): orderID,
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h.writeDB.UserCoupons.UsedAt.ColumnName().String(): paidAt,
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})
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} else {
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// 满减/折扣券：状态从冻结(4)改为已使用(2)
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_, _ = h.writeDB.UserCoupons.WithContext(ctx.RequestContext()).
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Where(h.writeDB.UserCoupons.ID.Eq(userCouponID)).
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Updates(map[string]any{
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h.writeDB.UserCoupons.Status.ColumnName().String(): 2,
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h.writeDB.UserCoupons.UsedOrderID.ColumnName().String(): orderID,
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h.writeDB.UserCoupons.UsedAt.ColumnName().String(): paidAt,
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})
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}
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}
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@ -378,6 +378,69 @@ func (s *service) DeletePrize(ctx context.Context, prizeID int64) error {
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// ========== 抽奖逻辑 ==========
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// selectPrizeByWeight 根据随机值和权重选择奖品（不考虑库存）
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func selectPrizeByWeight(prizes []*model.LivestreamPrizes, randValue int64) *model.LivestreamPrizes {
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var cumulative int64
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for _, p := range prizes {
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cumulative += int64(p.Weight)
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if randValue < cumulative {
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return p
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}
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}
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if len(prizes) > 0 {
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return prizes[len(prizes)-1]
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}
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return nil
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}
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// findFallbackPrize 找到权重最大的有库存奖品作为兜底
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func findFallbackPrize(prizes []*model.LivestreamPrizes) *model.LivestreamPrizes {
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var fallback *model.LivestreamPrizes
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for _, p := range prizes {
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if p.Remaining == 0 {
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continue
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}
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if fallback == nil || p.Weight > fallback.Weight {
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fallback = p
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}
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}
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return fallback
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}
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// drawWithFallback 抽奖：抽中售罄奖品时，穿透到权重最大的有库存奖品
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func (s *service) drawWithFallback(prizes []*model.LivestreamPrizes, totalWeight int64) (*model.LivestreamPrizes, int64, error) {
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randBig, err := rand.Int(rand.Reader, big.NewInt(totalWeight))
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if err != nil {
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return nil, 0, fmt.Errorf("生成随机数失败: %w", err)
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}
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randValue := randBig.Int64()
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selected := selectPrizeByWeight(prizes, randValue)
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if selected == nil {
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return nil, 0, fmt.Errorf("奖品选择失败")
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}
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// 有库存，直接返回
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if selected.Remaining == -1 || selected.Remaining > 0 {
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return selected, randValue, nil
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}
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// 售罄，穿透到权重最大的有库存奖品
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fallback := findFallbackPrize(prizes)
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if fallback == nil {
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return nil, 0, fmt.Errorf("没有可用奖品")
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}
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s.logger.Info("抽中售罄奖品，穿透到兜底奖品",
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zap.Int64("original_prize_id", selected.ID),
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zap.String("original_prize_name", selected.Name),
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zap.Int64("fallback_prize_id", fallback.ID),
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zap.String("fallback_prize_name", fallback.Name),
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)
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return fallback, randValue, nil
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}
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func (s *service) Draw(ctx context.Context, input DrawInput) (*DrawResult, error) {
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// 0. 检查黑名单
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if input.DouyinUserID != "" {
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@ -390,27 +453,35 @@ func (s *service) Draw(ctx context.Context, input DrawInput) (*DrawResult, error
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}
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}
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// 1. 获取可用奖品
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// 1. 获取所有奖品
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prizes, err := s.ListPrizes(ctx, input.ActivityID)
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if err != nil {
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return nil, fmt.Errorf("获取奖品列表失败: %w", err)
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}
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// 2. 过滤有库存的奖品
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var availablePrizes []*model.LivestreamPrizes
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if len(prizes) == 0 {
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return nil, fmt.Errorf("没有配置奖品")
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}
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// 2. 计算总权重（所有奖品都参与，保持概率恒定）
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var totalWeight int64
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var hasAvailable bool
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for _, p := range prizes {
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if p.Remaining != 0 { // -1 表示无限
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availablePrizes = append(availablePrizes, p)
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totalWeight += int64(p.Weight)
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totalWeight += int64(p.Weight)
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if p.Remaining != 0 { // -1 表示无限，>0 表示有库存
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hasAvailable = true
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}
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}
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if len(availablePrizes) == 0 {
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return nil, fmt.Errorf("没有可用奖品")
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if totalWeight == 0 {
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return nil, fmt.Errorf("奖品权重配置异常")
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}
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// 3. 生成随机种子
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if !hasAvailable {
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return nil, fmt.Errorf("没有可用奖品（全部售罄）")
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}
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// 3. 生成随机种子（用于凭证）
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seedBytes := make([]byte, 32)
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if _, err := rand.Read(seedBytes); err != nil {
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return nil, fmt.Errorf("生成随机种子失败: %w", err)
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@ -418,26 +489,10 @@ func (s *service) Draw(ctx context.Context, input DrawInput) (*DrawResult, error
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seedHash := sha256.Sum256(seedBytes)
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seedHex := hex.EncodeToString(seedHash[:])
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// 4. 计算随机值
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randBig, err := rand.Int(rand.Reader, big.NewInt(totalWeight))
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// 4. 穿透抽奖：抽中售罄奖品时给权重最大的有库存奖品
|
||||
selectedPrize, randValue, err := s.drawWithFallback(prizes, totalWeight)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("生成随机数失败: %w", err)
|
||||
}
|
||||
randValue := randBig.Int64()
|
||||
|
||||
// 5. 按权重选择奖品
|
||||
var selectedPrize *model.LivestreamPrizes
|
||||
var cumulative int64
|
||||
for _, p := range availablePrizes {
|
||||
cumulative += int64(p.Weight)
|
||||
if randValue < cumulative {
|
||||
selectedPrize = p
|
||||
break
|
||||
}
|
||||
}
|
||||
|
||||
if selectedPrize == nil {
|
||||
selectedPrize = availablePrizes[len(availablePrizes)-1]
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// 6. 事务：扣减库存 + 记录中奖
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user