Rogee
dbfb08ed37
- Added CouponID field to Order model to track used coupons. - Updated order query generation to include CouponID. - Introduced UserCoupon model to manage user coupon associations. - Implemented query methods for UserCoupon to facilitate CRUD operations. - Updated query context and default query setup to include UserCoupon.
85 lines
2.5 KiB
Go
85 lines
2.5 KiB
Go
package services
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import (
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"context"
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"time"
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"quyun/v2/app/errorx"
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"quyun/v2/database/models"
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)
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// @provider
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type coupon struct{}
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// Validate checks if a coupon can be used for an order and returns the discount amount
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func (s *coupon) Validate(ctx context.Context, userID, userCouponID, amount int64) (int64, error) {
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uc, err := models.UserCouponQuery.WithContext(ctx).Where(models.UserCouponQuery.ID.Eq(userCouponID)).First()
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if err != nil {
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return 0, errorx.ErrRecordNotFound.WithMsg("优惠券不存在")
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}
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if uc.UserID != userID {
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return 0, errorx.ErrUnauthorized.WithMsg("无权使用该优惠券")
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}
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if uc.Status != "unused" {
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return 0, errorx.ErrBusinessLogic.WithMsg("优惠券已使用或失效")
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}
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c, err := models.CouponQuery.WithContext(ctx).Where(models.CouponQuery.ID.Eq(uc.CouponID)).First()
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if err != nil {
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return 0, errorx.ErrRecordNotFound.WithMsg("优惠券信息缺失")
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}
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now := time.Now()
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if !c.StartAt.IsZero() && now.Before(c.StartAt) {
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return 0, errorx.ErrBusinessLogic.WithMsg("优惠券尚未生效")
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}
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if !c.EndAt.IsZero() && now.After(c.EndAt) {
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return 0, errorx.ErrBusinessLogic.WithMsg("优惠券已过期")
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}
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if amount < c.MinOrderAmount {
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return 0, errorx.ErrBusinessLogic.WithMsg("未达到优惠券使用门槛")
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}
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var discount int64
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if c.Type == "fix_amount" {
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discount = c.Value
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} else if c.Type == "discount" {
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discount = (amount * c.Value) / 100
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if c.MaxDiscount > 0 && discount > c.MaxDiscount {
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discount = c.MaxDiscount
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}
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}
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// Discount cannot exceed order amount
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if discount > amount {
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discount = amount
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}
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return discount, nil
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}
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// MarkUsed marks a user coupon as used (intended to be called inside a transaction)
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func (s *coupon) MarkUsed(ctx context.Context, tx *models.Query, userCouponID, orderID int64) error {
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now := time.Now()
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// Update User Coupon
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info, err := tx.UserCoupon.WithContext(ctx).Where(tx.UserCoupon.ID.Eq(userCouponID), tx.UserCoupon.Status.Eq("unused")).Updates(&models.UserCoupon{
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Status: "used",
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OrderID: orderID,
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UsedAt: now,
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})
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if err != nil {
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return err
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}
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if info.RowsAffected == 0 {
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return errorx.ErrBusinessLogic.WithMsg("优惠券核销失败")
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}
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// Update Coupon used quantity (Optional, but good for stats)
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// We need CouponID from uc
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uc, _ := tx.UserCoupon.WithContext(ctx).Where(tx.UserCoupon.ID.Eq(userCouponID)).First()
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_, _ = tx.Coupon.WithContext(ctx).Where(tx.Coupon.ID.Eq(uc.CouponID)).UpdateSimple(tx.Coupon.UsedQuantity.Add(1))
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return nil
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}
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