From 3eef65777a5f1beb5d6a69deae2ff70418359ea8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=BC=A0=E6=9D=BE?=
 <8605635+zhang3064194730@user.noreply.gitee.com>
Date: Sat, 23 Nov 2024 17:09:48 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20=E8=AE=A2=E5=8D=95=E8=AF=A6=E6=83=85?=
 =?UTF-8?q?=E5=A2=9E=E5=8A=A0=E5=8F=AF=E9=80=80=E6=AC=BE=E9=87=91=E9=A2=9D?=
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---
 .../cashierservice/entity/TbOrderDetail.java  |  1 +
 .../cashierservice/service/CartService.java   | 26 +++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/src/main/java/com/chaozhanggui/system/cashierservice/entity/TbOrderDetail.java b/src/main/java/com/chaozhanggui/system/cashierservice/entity/TbOrderDetail.java
index b356312..7faaa60 100644
--- a/src/main/java/com/chaozhanggui/system/cashierservice/entity/TbOrderDetail.java
+++ b/src/main/java/com/chaozhanggui/system/cashierservice/entity/TbOrderDetail.java
@@ -50,5 +50,6 @@ public class TbOrderDetail implements Serializable {
     private static final long serialVersionUID = 1L;
     private Integer isMember;
     private String useCouponInfo;
+    private BigDecimal canReturnAmount;
 
 }
diff --git a/src/main/java/com/chaozhanggui/system/cashierservice/service/CartService.java b/src/main/java/com/chaozhanggui/system/cashierservice/service/CartService.java
index 3c79e7a..e21346b 100644
--- a/src/main/java/com/chaozhanggui/system/cashierservice/service/CartService.java
+++ b/src/main/java/com/chaozhanggui/system/cashierservice/service/CartService.java
@@ -1525,6 +1525,10 @@ public class CartService {
                 orderInfo.setCouponInfoList(JSONObject.toJSONString(infoDTO));
             }
 
+
+            // 计算可退款金额
+            updateOrderDetailCanReturn(detailPriceDTO.getOrderDetailList(), orderInfo);
+
             // 修改订单详情并打票
             updateDetailAndPrint(orderInfo, detailPriceDTO, shopEatTypeInfoDTO, orderDTO.isOnlyChangeCoupon());
 
@@ -1558,6 +1562,28 @@ public class CartService {
         }
     }
 
+    private void updateOrderDetailCanReturn(List<TbOrderDetail> orderDetailList, TbOrderInfo orderInfo) {
+        orderDetailList = orderDetailList.stream().filter(item -> TableConstant.OrderInfo.Status.UNPAID.equalsVals(item.getStatus())).collect(Collectors.toList());
+        BigDecimal totalAmount = BigDecimal.ZERO;
+        BigDecimal lastAmount = BigDecimal.ZERO;
+        BigDecimal lastReturnAmount = BigDecimal.ZERO;
+        BigDecimal orderAmount = orderInfo.getOrderAmount();
+        for (TbOrderDetail orderDetail : orderDetailList) {
+            totalAmount = totalAmount.add(orderDetail.getPriceAmount());
+        }
+        for (TbOrderDetail item : orderDetailList) {
+            if (StrUtil.isNotBlank(orderInfo.getCouponInfoList()) || orderInfo.getPointsNum() != null) {
+                BigDecimal canReturnAmount = item.getPriceAmount().divide(totalAmount.subtract(lastAmount), 10, RoundingMode.HALF_DOWN)
+                        .multiply(orderAmount.subtract(lastReturnAmount)).setScale(2, RoundingMode.HALF_DOWN);
+                lastReturnAmount = canReturnAmount;
+                lastAmount = item.getPriceAmount();
+                item.setCanReturnAmount(canReturnAmount);
+            }else {
+                item.setCanReturnAmount(item.getPriceAmount());
+            }
+        }
+    }
+
     private void returnCoupon(TbOrderInfo orderInfo) {
         // 返还优惠券
         PayService.returnCoupon(orderInfo, shopCouponService, mpCashierCartMapper);