1.定时任务-待付款-15分钟 2.领券中心：根据领取次数判断是否已领取 3.付款：优惠券自动领取最大优惠券

陶杰

2024-11-14 5ff8fb8bd9d298def47437b24e77c8879cdc37d2

 src/main/java/com/mzl/flower/service/impl/coupon/CouponRecordServiceImpl.java

@@ -33,6 +33,7 @@
import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.time.temporal.TemporalAdjusters;
import java.util.Comparator;
import java.util.List;
import java.util.Objects;
import java.util.concurrent.TimeUnit;
@@ -571,4 +572,59 @@

        return couponRecordMapperCustom.expireCouponRecordAll();
    }

    @Override
    public CouponRecordVO getUnusedFit(QueryMineCouponRecordDTO dto) {

        /**
         * ①.先查询出满足条件的优惠券(满减面值最大)
         * ②.查询面值最大的优惠券（无门槛面值最大）
         * ③查询过期时间早的优惠券④在满足③的条件下，优先使用无门槛优惠券
         * ④基于以上规则如果还存在相同的优惠券，任意选择一张优惠券即可
         */

        CouponRecordVO bestCoupon=null;
        // 查出我所有可用优惠券
        final List<CouponRecordVO> mineCouponRecordList = getMineCouponRecordList(dto);

        if(null!=dto.getOrderAmount() && CollectionUtils.isNotEmpty(mineCouponRecordList)){
            // ①.先查询出满足条件的优惠券
            // 遍历优惠券列表，找出所有minOrderAmount >= dto.orderAmount ，且couponDiscountValue 最大的优惠券
            // 筛选符合条件并找出优惠面值最大的优惠券
            bestCoupon = mineCouponRecordList.stream()
                    // 筛选出 minOrderAmount >= dto.orderAmount 的优惠券并且优惠券类型是discount的
                    .filter(coupon -> coupon.getCouponDiscountType().equals(CouponTypeEnum.DISCOUNT.getType()))
                    .filter(coupon -> coupon.getMinOrderAmount().compareTo(dto.getOrderAmount()) <= 0)
                    // 按 couponDiscountValue 倒序排序
                    .max(Comparator.comparing(CouponRecordVO::getCouponDiscountValue))
                    // 如果没有符合条件的优惠券，使用 Optional.orElse(null) 返回 null
                    .orElse(null);

            if(null==bestCoupon){
            // ②.查询面值最大的优惠券（无门槛面值最大）
//               过滤出discountType 是zero的优惠券，并根据couponDiscountValue倒序排序
                bestCoupon = mineCouponRecordList.stream()
                        .filter(coupon -> coupon.getCouponDiscountType().equals(CouponTypeEnum.ZERO.getType()))
                        .max(Comparator.comparing(CouponRecordVO::getCouponDiscountValue))
                        .orElse(null);

                // ③查询过期时间早的优惠券
                if(null!=bestCoupon){
                    final BigDecimal zeroMaxCouponDiscountValue = bestCoupon.getCouponDiscountValue();
                    // 过滤出discountType 是zero的优惠券，且couponDiscountValue与bestCoupon的couponDiscountValue面值一样的优惠券，并根据effectiveEnd正序排，获取第一条数据
                    CouponRecordVO effectiveEndEarlyCoupon= mineCouponRecordList.stream()
                            .filter(coupon -> coupon.getCouponDiscountType().equals(CouponTypeEnum.ZERO.getType()))
                            .filter(coupon -> coupon.getCouponDiscountValue().compareTo(zeroMaxCouponDiscountValue)==0)
                            .min(Comparator.comparing(CouponRecordVO::getEffectiveEnd))
                            .orElse(null);
                    if(null!=effectiveEndEarlyCoupon){
                        bestCoupon=effectiveEndEarlyCoupon;
                    }
                }

            }
        }
        return bestCoupon;

    }
}