From 715ba070dde400a6697b0b334fe8e9d2e5706f80 Mon Sep 17 00:00:00 2001
From: Cui Zhi Feng <cuizf@fengyuntec.com>
Date: 星期四, 12 九月 2024 21:03:49 +0800
Subject: [PATCH] 下单优惠券计算
---
src/main/java/com/mzl/flower/service/payment/OrderService.java | 33 ++++++++++++++++++++++++++++-----
1 files changed, 28 insertions(+), 5 deletions(-)
diff --git a/src/main/java/com/mzl/flower/service/payment/OrderService.java b/src/main/java/com/mzl/flower/service/payment/OrderService.java
index 54c79fb..18d752e 100644
--- a/src/main/java/com/mzl/flower/service/payment/OrderService.java
+++ b/src/main/java/com/mzl/flower/service/payment/OrderService.java
@@ -442,7 +442,7 @@
order.setTransportFee(transportFee);
order.setDeliveryName(deliveryName);
- BigDecimal totalAmount = order.getFlowerAmount().add(p.getPacking()).add(transportFee);//使用优惠券之前的总价
+ BigDecimal totalAmount = order.getFlowerAmount();//使用优惠券之前的总价，使用商品价格
CouponRecordDO coupon = useCouponRecord(order.getId(), totalAmount, dto.getCouponRecordId());
log.info("用户优惠券: " + coupon);
if(coupon != null){
@@ -453,7 +453,14 @@
totalAmount = totalAmount.subtract(order.getMemberCouponAmount());//满足条件需要减去优惠券金额
}
- order.setTotalAmount(totalAmount);
+ if(totalAmount.doubleValue() < 0){//假如扣除优惠券后金额小于0，则按0计算
+ totalAmount = new BigDecimal(0);
+ }
+ totalAmount = totalAmount.add(p.getPacking()).add(transportFee);
+ if(totalAmount.doubleValue() <= 0){//假如总价小于等于0，则支付0.01元
+ totalAmount = new BigDecimal(0.01);
+ }
+ order.setTotalAmount(totalAmount.add(p.getPacking()).add(transportFee));
order.setCustomer(address.getName());
order.setCustomerTel(address.getTel());
@@ -475,7 +482,9 @@
Map<Long, List<ParamItemDTO>> paramMap = new HashMap<>();
final BigDecimal flowerAmount = order.getFlowerAmount();//订单商品总价
final BigDecimal memberCouponAmount = order.getMemberCouponAmount();//使用优惠券面值
- for (FlowerCartListDTO f : flowers) {
+ BigDecimal usedCouponAmount = new BigDecimal(0);
+ for (int i = 0; i < flowers.size(); i++) {
+ FlowerCartListDTO f = flowers.get(i);
OrderItem t = new OrderItem();
t.setId(UUIDGenerator.getUUID());
t.setOrderId(order.getId());
@@ -504,9 +513,13 @@
t.setTotal(f.getTotalMember());//使用会员总价
t.setOriginalPrice(pp.getPrice());//非会员售价
- BigDecimal couponAmount = calculateCoupon(memberCouponAmount, t.getTotal(), flowerAmount, t.getNum());
+ boolean isLastOne = i == (flowers.size() - 1);
+ BigDecimal couponAmount = calculateCoupon(memberCouponAmount, t.getTotal()
+ , flowerAmount, t.getNum(), t.getPrice(), isLastOne, usedCouponAmount);
t.setCouponAmount(couponAmount);//每扎平摊的优惠券面值
t.setRealPrice(t.getPrice().subtract(couponAmount));//退款时使用的真实成交价
+
+ usedCouponAmount = usedCouponAmount.add(couponAmount.multiply(BigDecimal.valueOf(t.getNum())));
t.create(userId);
orderItemMapper.insert(t);
@@ -551,13 +564,23 @@
* @param itemTotalAmount
* @param totalAmount
* @param num
+ * @param price
* @return
*/
private BigDecimal calculateCoupon(BigDecimal couponAmount, BigDecimal itemTotalAmount
- , BigDecimal totalAmount, Integer num){
+ , BigDecimal totalAmount, Integer num, BigDecimal price
+ , boolean isLastOne, BigDecimal usedCouponAmount){
if(couponAmount == null){
return new BigDecimal(0);
}
+
+ if(couponAmount.doubleValue() >= totalAmount.doubleValue()){
+ return price;
+ }
+ if(isLastOne){//最后的商品使用优惠券剩下的面值
+ BigDecimal subCoupon = couponAmount.subtract(usedCouponAmount);//占有的优惠券面值
+ return subCoupon.divide(BigDecimal.valueOf(num), 2, RoundingMode.HALF_UP);
+ }
BigDecimal radio = itemTotalAmount.divide(totalAmount, 2, RoundingMode.HALF_UP);//计算该商品总价在订单中的占比
BigDecimal subCoupon = couponAmount.multiply(radio);//占有的优惠券面值
return subCoupon.divide(BigDecimal.valueOf(num), 2, RoundingMode.HALF_UP);
--
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