refactor(mall): 重构 getCouponAmountMap 方法

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2025-05-20 c92f4c5a78a77331c65059a635191b35752346bf

refactor(mall): 重构 getCouponAmountMap 方法

- 优化了代码结构，提高了可读性和可维护性
- 使用了 Optional 和 Stream API 来处理空值和集合操作
- 改进了数值计算，增加了对边界情况的处理
- 调整了最后一个商品的减免金额，以确保总减免金额达到预期

 src/main/java/cc/mrbird/febs/mall/service/impl/ApiMallOrderInfoServiceImpl.java

@@ -333,6 +333,91 @@
        return scoreAmountMap;
    }

//    /**
//     * 根据传入的优惠卷ID和商品明细集合计算出每个商品获取的实际支付金额
//     * @param memberCouponId 优惠卷ID
//     * @param items 商品明细
//     * @return Map<Long,BigDecimal> skuId，实际支付金额
//     */
//    @Override
//    public Map<Long,BigDecimal> getCouponAmountMap(Long memberCouponId,List<AddOrderItemDto> items){
//        HashMap<Long,BigDecimal> couponAmountMap = new HashMap<>();
//        MallMemberCoupon mallMemberCoupon = mallMemberCouponMapper.selectById(memberCouponId);
//        if(ObjectUtil.isEmpty(mallMemberCoupon)){
//            return couponAmountMap;
//        }
//        Integer state = mallMemberCoupon.getState();
//        if(1 != state){
//            return couponAmountMap;
//        }
//        Long couponId = mallMemberCoupon.getCouponId();//优惠卷ID
//        List<Long> goodsIdsAll = couponGoodsMapper.selectByCouponId(couponId);
//        List<MallGoodsSku> skusAll = mallGoodsSkuMapper.selectSkuIdsByGoodsId(goodsIdsAll);//获取该优惠卷绑定的全部商品sku
//        List<Long> skuIdsAll = skusAll.stream().map(MallGoodsSku::getId).collect(Collectors.toList());//获取该优惠卷绑定的全部商品skuIDS
//        List<Long> skuIds = items.stream().map(AddOrderItemDto::getSkuId).collect(Collectors.toList());//订单中的全部skuIds
//
//        /**
//         * 获取这张优惠卷生效的skuIds
//         */
//        Set<Long> intersection = skuIdsAll.stream()
//                .filter(item -> skuIds.contains(item))
//                .collect(Collectors.toSet());//获取两个集合的交集
//        if(CollUtil.isEmpty(intersection)){
//            return couponAmountMap;
//        }
//        HashMap<Long,BigDecimal> skuMap = new HashMap<>();//每个订单详情的ID和amount的map
//        List<MallGoodsSku> skus = mallGoodsSkuMapper.selectByIds(new ArrayList<>(intersection));
//        BigDecimal totalAmount = BigDecimal.ZERO;//订单中的总金额
//        Map<Long, AddOrderItemDto> itemMap = new HashMap<>();// 预先将items转换为Map，以skuId作为键
//        for (AddOrderItemDto addOrderItemDto : items) {
//            itemMap.put(addOrderItemDto.getSkuId(), addOrderItemDto);
//        }
//        for(MallGoodsSku mallGoodsSku : skus){
//            Long id = mallGoodsSku.getId();
//            BigDecimal presentPrice = mallGoodsSku.getPresentPrice();
//            // 检查itemMap中是否存在该商品
//            AddOrderItemDto addOrderItemDto = itemMap.get(id);
//            if (addOrderItemDto != null) {
//                BigDecimal skuAmount = presentPrice.multiply(BigDecimal.valueOf(addOrderItemDto.getCnt()));
//                totalAmount = totalAmount.add(skuAmount);
//                skuMap.put(id,skuAmount);
//            }
//        }
//
//        /**
//         * 计算每个商品利用优惠卷打折的具体金额
//         */
//        MallGoodsCoupon mallGoodsCoupon = mallGoodsCouponMapper.selectById(mallMemberCoupon.getCouponId());
//        BigDecimal costAmount = mallGoodsCoupon.getCostAmount();
//        BigDecimal realAmount = mallGoodsCoupon.getRealAmount();
//        if(totalAmount.compareTo(costAmount) < 0){
//            return couponAmountMap;
//        }
//        HashMap<Long,BigDecimal> skuMapPercent = new HashMap<>();//每个订单详情的ID和amount的map
//        for (Map.Entry<Long,BigDecimal> entry : skuMap.entrySet()) {
//            Long keySkuId = entry.getKey();
//            BigDecimal valueSkuAmount = entry.getValue();
//            BigDecimal divide = valueSkuAmount.divide(totalAmount, 4, BigDecimal.ROUND_DOWN);//每个商品占符合满减的总额的比例
//            skuMapPercent.put(keySkuId,divide);
//            Integer type = mallGoodsCoupon.getType();
//            if(MallGoodsCoupon.TYPE_ONE == type){
//                BigDecimal bigDecimal = realAmount.multiply(divide).setScale(0, BigDecimal.ROUND_DOWN);//每个SKU的减免金额(比例*减免金额)
//                BigDecimal skuRealAmount = valueSkuAmount.subtract(bigDecimal.compareTo(BigDecimal.ZERO) > 0 ? bigDecimal : BigDecimal.ZERO);//实际支付金额
//                couponAmountMap.put(keySkuId,skuRealAmount);
//            }
//            if(MallGoodsCoupon.TYPE_TWO == type){
//                BigDecimal divideTime = totalAmount.divide(costAmount, 0, BigDecimal.ROUND_DOWN);//累计减免次数
//                BigDecimal multiply = divideTime.multiply(realAmount);//实际减免金额
//                BigDecimal bigDecimal = multiply.multiply(divide).setScale(0, BigDecimal.ROUND_DOWN);//每个SKU的减免金额(比例*实际减免金额)
//                BigDecimal skuRealAmount = valueSkuAmount.subtract(bigDecimal.compareTo(BigDecimal.ZERO) > 0 ? bigDecimal : BigDecimal.ZERO);//实际支付金额
//                couponAmountMap.put(keySkuId,skuRealAmount);
//            }
//        }
//        return couponAmountMap;
//    }



    /**
     * 根据传入的优惠卷ID和商品明细集合计算出每个商品获取的实际支付金额
     * @param memberCouponId 优惠卷ID
@@ -340,79 +425,98 @@
     * @return Map<Long,BigDecimal> skuId，实际支付金额
     */
    @Override
    public Map<Long,BigDecimal> getCouponAmountMap(Long memberCouponId,List<AddOrderItemDto> items){
        HashMap<Long,BigDecimal> couponAmountMap = new HashMap<>();
        MallMemberCoupon mallMemberCoupon = mallMemberCouponMapper.selectById(memberCouponId);
        if(ObjectUtil.isEmpty(mallMemberCoupon)){
            return couponAmountMap;
        }
        Integer state = mallMemberCoupon.getState();
        if(1 != state){
            return couponAmountMap;
        }
        Long couponId = mallMemberCoupon.getCouponId();//优惠卷ID
        List<Long> goodsIdsAll = couponGoodsMapper.selectByCouponId(couponId);
        List<MallGoodsSku> skusAll = mallGoodsSkuMapper.selectSkuIdsByGoodsId(goodsIdsAll);//获取该优惠卷绑定的全部商品sku
        List<Long> skuIdsAll = skusAll.stream().map(MallGoodsSku::getId).collect(Collectors.toList());//获取该优惠卷绑定的全部商品skuIDS
        List<Long> skuIds = items.stream().map(AddOrderItemDto::getSkuId).collect(Collectors.toList());//订单中的全部skuIds
    public Map<Long, BigDecimal> getCouponAmountMap(Long memberCouponId, List<AddOrderItemDto> items) {
        HashMap<Long, BigDecimal> couponAmountMap = new HashMap<>();
        // 获取优惠券信息
        Optional<MallMemberCoupon> optionalMallMemberCoupon = Optional.ofNullable(mallMemberCouponMapper.selectById(memberCouponId));
        MallMemberCoupon mallMemberCoupon = optionalMallMemberCoupon.orElse(null);

        /**
         * 获取这张优惠卷生效的skuIds
         */
        Set<Long> intersection = skuIdsAll.stream()
                .filter(item -> skuIds.contains(item))
                .collect(Collectors.toSet());//获取两个集合的交集
        if(CollUtil.isEmpty(intersection)){
        if (mallMemberCoupon == null || mallMemberCoupon.getState() != 1) {
            return couponAmountMap;
        }
        HashMap<Long,BigDecimal> skuMap = new HashMap<>();//每个订单详情的ID和amount的map
        List<MallGoodsSku> skus = mallGoodsSkuMapper.selectByIds(new ArrayList<>(intersection));
        BigDecimal totalAmount = BigDecimal.ZERO;//订单中的总金额
        Map<Long, AddOrderItemDto> itemMap = new HashMap<>();// 预先将items转换为Map，以skuId作为键
        for (AddOrderItemDto addOrderItemDto : items) {
            itemMap.put(addOrderItemDto.getSkuId(), addOrderItemDto);

        Set<Long> intersection = items.stream().map(AddOrderItemDto::getSkuId).collect(Collectors.toSet()); // 订单中的全部skuIds

        if (intersection.isEmpty()) {
            return couponAmountMap;
        }
        for(MallGoodsSku mallGoodsSku : skus){

        // 获取订单详情的ID和amount的map
        Map<Long, AddOrderItemDto> itemMap = items.stream()
                .collect(Collectors.toMap(AddOrderItemDto::getSkuId, item -> item));

        List<MallGoodsSku> skus = mallGoodsSkuMapper.selectList(
                new LambdaQueryWrapper<MallGoodsSku>()
                        .select(MallGoodsSku::getId, MallGoodsSku::getPresentPrice)
                        .in(MallGoodsSku::getId, intersection)
        );
        BigDecimal totalAmount = BigDecimal.ZERO;
        Map<Long, BigDecimal> skuMap = new HashMap<>();

        for (MallGoodsSku mallGoodsSku : skus) {
            Long id = mallGoodsSku.getId();
            BigDecimal presentPrice = mallGoodsSku.getPresentPrice();
            // 检查itemMap中是否存在该商品
            AddOrderItemDto addOrderItemDto = itemMap.get(id);
            if (addOrderItemDto != null) {
                BigDecimal skuAmount = presentPrice.multiply(BigDecimal.valueOf(addOrderItemDto.getCnt()));
                totalAmount = totalAmount.add(skuAmount);
                skuMap.put(id,skuAmount);
                skuMap.put(id, skuAmount);
            }
        }

        /**
         * 计算每个商品利用优惠卷打折的具体金额
         */
        MallGoodsCoupon mallGoodsCoupon = mallGoodsCouponMapper.selectById(mallMemberCoupon.getCouponId());
        BigDecimal costAmount = mallGoodsCoupon.getCostAmount();
        BigDecimal realAmount = mallGoodsCoupon.getRealAmount();
        if(totalAmount.compareTo(costAmount) < 0){
        // 计算每个商品利用优惠卷打折的具体金额
        Optional<MallGoodsCoupon> optionalMallGoodsCoupon = Optional.ofNullable(mallGoodsCouponMapper.selectById(mallMemberCoupon.getCouponId()));
        MallGoodsCoupon mallGoodsCoupon = optionalMallGoodsCoupon.orElse(null);
        if (mallGoodsCoupon == null) {
            return couponAmountMap;
        }
        HashMap<Long,BigDecimal> skuMapPercent = new HashMap<>();//每个订单详情的ID和amount的map
        for (Map.Entry<Long,BigDecimal> entry : skuMap.entrySet()) {

        BigDecimal costAmount = mallGoodsCoupon.getCostAmount();
        BigDecimal realAmount = mallGoodsCoupon.getRealAmount();
        Integer type = mallGoodsCoupon.getType();
        if (MallGoodsCoupon.TYPE_ONE == type) {
            realAmount = mallGoodsCoupon.getRealAmount();
        } else if (MallGoodsCoupon.TYPE_TWO == type) {
            BigDecimal divideTime = totalAmount.divide(costAmount, 0, RoundingMode.DOWN); // 累计减免次数
            realAmount = divideTime.multiply(realAmount); // 实际减免金额
        }

        if (totalAmount.compareTo(costAmount) < 0) {
            return couponAmountMap;
        }

        BigDecimal totalDiscount = BigDecimal.ZERO;
        for (Map.Entry<Long, BigDecimal> entry : skuMap.entrySet()) {
            Long keySkuId = entry.getKey();
            BigDecimal valueSkuAmount = entry.getValue();
            BigDecimal divide = valueSkuAmount.divide(totalAmount, 4, BigDecimal.ROUND_DOWN);//每个商品占符合满减的总额的比例
            skuMapPercent.put(keySkuId,divide);
            Integer type = mallGoodsCoupon.getType();
            if(MallGoodsCoupon.TYPE_ONE == type){
                BigDecimal bigDecimal = realAmount.multiply(divide).setScale(0, BigDecimal.ROUND_DOWN);//每个SKU的减免金额(比例*减免金额)
                BigDecimal skuRealAmount = valueSkuAmount.subtract(bigDecimal.compareTo(BigDecimal.ZERO) > 0 ? bigDecimal : BigDecimal.ZERO);//实际支付金额
                couponAmountMap.put(keySkuId,skuRealAmount);
            BigDecimal divide = valueSkuAmount.divide(totalAmount, 4, RoundingMode.DOWN); // 每个商品占符合满减的总额的比例
            BigDecimal skuRealAmount = BigDecimal.ZERO;
            if (MallGoodsCoupon.TYPE_ONE == type) {
                BigDecimal bigDecimalOne = realAmount.multiply(divide).setScale(2, RoundingMode.DOWN); // 每个SKU的减免金额(比例*减免金额)
                skuRealAmount = valueSkuAmount.subtract(bigDecimalOne.max(BigDecimal.ZERO)).setScale(2, RoundingMode.DOWN);
                totalDiscount = totalDiscount.add(bigDecimalOne);
            } else if (MallGoodsCoupon.TYPE_TWO == type) {
                BigDecimal divideTime = totalAmount.divide(costAmount, 0, RoundingMode.DOWN); // 累计减免次数
                BigDecimal multiply = divideTime.multiply(realAmount); // 实际减免金额
                BigDecimal bigDecimalTwo = multiply.multiply(divide).setScale(2, RoundingMode.DOWN); // 每个SKU的减免金额(比例*实际减免金额)
                skuRealAmount = valueSkuAmount.subtract(bigDecimalTwo.max(BigDecimal.ZERO)).setScale(2, RoundingMode.DOWN);
                totalDiscount = totalDiscount.add(bigDecimalTwo);
            }
            if(MallGoodsCoupon.TYPE_TWO == type){
                BigDecimal divideTime = totalAmount.divide(costAmount, 0, BigDecimal.ROUND_DOWN);//累计减免次数
                BigDecimal multiply = divideTime.multiply(realAmount);//实际减免金额
                BigDecimal bigDecimal = multiply.multiply(divide).setScale(0, BigDecimal.ROUND_DOWN);//每个SKU的减免金额(比例*实际减免金额)
                BigDecimal skuRealAmount = valueSkuAmount.subtract(bigDecimal.compareTo(BigDecimal.ZERO) > 0 ? bigDecimal : BigDecimal.ZERO);//实际支付金额
                couponAmountMap.put(keySkuId,skuRealAmount);
            couponAmountMap.put(keySkuId, skuRealAmount);
        }

        // 调整最后一个商品的减免金额以确保总减免金额达到预期
        if (totalDiscount.compareTo(realAmount) < 0) {
            BigDecimal difference = realAmount.subtract(totalDiscount);
            for (Map.Entry<Long, BigDecimal> entry : couponAmountMap.entrySet()) {
                Long keySkuId = entry.getKey();
                BigDecimal skuRealAmount = entry.getValue();
                BigDecimal newSkuRealAmount = skuRealAmount.subtract(difference).setScale(2, RoundingMode.DOWN);
                couponAmountMap.put(keySkuId, newSkuRealAmount);
                break; // 调整最后一个商品的减免金额
            }
        }

        return couponAmountMap;
    }