65 lines
1.5 KiB
Go
65 lines
1.5 KiB
Go
package services
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import (
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"errors"
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"fmt"
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"platform/web/core"
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m "platform/web/models"
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q "platform/web/queries"
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"time"
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"github.com/shopspring/decimal"
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"gorm.io/gorm"
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)
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var Coupon = &couponService{}
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type couponService struct{}
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func (s *couponService) GetCouponAvailableByCode(code string, amount decimal.Decimal, uid *int32) (*m.Coupon, error) {
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// 获取优惠券
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coupon, err := q.Coupon.Where(
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q.Coupon.Code.Eq(code),
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q.Coupon.Status.Eq(int(m.CouponStatusUnused)),
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q.Coupon.
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Where(q.Coupon.ExpireAt.Gt(time.Now())).
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Or(q.Coupon.ExpireAt.IsNull()),
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).Take()
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if errors.Is(err, gorm.ErrRecordNotFound) {
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return nil, core.NewBizErr("优惠券不存在或已失效")
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}
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if err != nil {
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return nil, core.NewBizErr("获取优惠券数据失败", err)
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}
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// 检查最小使用额度
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if amount.Cmp(coupon.MinAmount) < 0 {
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return nil, core.NewBizErr(fmt.Sprintf("使用此优惠券的最小额度为 %s", coupon.MinAmount))
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}
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// 检查所属
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if coupon.UserID != nil {
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if uid == nil {
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return nil, core.NewBizErr("检查优惠券所属用户失败")
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}
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if *coupon.UserID != *uid {
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return nil, core.NewBizErr("优惠券不属于当前用户")
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}
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}
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return coupon, nil
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}
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func (s *couponService) UseCoupon(q *q.Query, id int32) error {
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_, err := q.Coupon.
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Where(
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q.Coupon.ID.Eq(id),
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q.Coupon.Status.Eq(int(m.CouponStatusUnused)),
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q.Coupon.ExpireAt.Gt(time.Now()),
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).
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UpdateSimple(
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q.Coupon.Status.Value(int(m.CouponStatusUsed)),
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)
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return err
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}
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