下单完成订单商户和平台收益计算

nightFragrance-massage/src/main/java/com/ylx/order/domain/TOrder.java

@@ -189,4 +189,10 @@ public class TOrder extends BaseEntity {
 
     @ApiModelProperty("预约结束时间")
     private LocalDateTime appointmentEndTime;
+
+    @ApiModelProperty("平台收益")
+    private BigDecimal platformIncome;
+
+    @ApiModelProperty("商户收益")
+    private BigDecimal merchantIncome;
 }

nightFragrance-massage/src/main/java/com/ylx/order/service/impl/TOrderServiceImpl.java

@@ -304,18 +304,21 @@ public class TOrderServiceImpl extends ServiceImpl<TOrderMapper, TOrder> impleme
         TOrder order = buildOrder(dto, project, maTechnician, address, merchantAddressList,
                 basePrice, trafficFee, couponDiscount, finalAmount, userId);
 
-        // 8. 保存订单
+        // 8. 计算商户、平台分佣金额
+        this.calculateOrderIncome(order, finalAmount, project.getMerchantShareRatio());
+
+        // 9. 保存订单
         boolean saveResult = this.save(order);
         if (!saveResult) {
             throw new ServiceException("添加订单失败");
         }
 
-        // 9. 更新优惠券关联的真实订单ID (因为刚才核销时订单还没生成，这里补上)
+        // 10. 更新优惠券关联的真实订单ID (因为刚才核销时订单还没生成，这里补上)
         if (ObjectUtil.isNotNull(dto.getCouponId())) {
             this.couponService.useCoupon(dto.getCouponId(), openId, order.getId(), 1);
         }
 
-        // 10. 处理余额支付逻辑
+        // 11. 处理余额支付逻辑
         if (ObjectUtil.equals(PaymentMethodEnum.BALANCE.getCode(), dto.getPaymentMethod())) {
             handleBalancePayment(userId, finalAmount, order);
             map.put("orderId", order.getId());
@@ -925,4 +928,35 @@ public class TOrderServiceImpl extends ServiceImpl<TOrderMapper, TOrder> impleme
         return duration * factor;
     }
 
+    /**
+     * 计算订单分佣金额
+     * 核心财务原则：先算出其中一方收益，另一方用总金额相减，避免精度丢失导致 1 分钱误差
+     *
+     * @param order           订单对象
+     * @param finalAmount     最终实付金额
+     * @param merchantShareRatio 商户分佣比例(%)
+     */
+    private void calculateOrderIncome(TOrder order, BigDecimal finalAmount, BigDecimal merchantShareRatio) {
+        if (ObjectUtil.isNull(finalAmount) || finalAmount.compareTo(BigDecimal.ZERO) <= 0) {
+            order.setPlatformIncome(BigDecimal.ZERO);
+            order.setMerchantIncome(BigDecimal.ZERO);
+            return;
+        }
+
+        // 防止分佣比例为空
+        BigDecimal ratio = Optional.ofNullable(merchantShareRatio).orElse(BigDecimal.ZERO);
+        BigDecimal hundred = new BigDecimal("100");
+
+        // 1. 计算商户收益 = 实付金额 * 商户比例 / 100，保留两位小数，四舍五入
+        BigDecimal merchantIncome = finalAmount.multiply(ratio)
+                .divide(hundred, 2, RoundingMode.HALF_UP);
+
+        // 2. 计算平台收益 = 实付金额 - 商户收益
+        BigDecimal platformIncome = finalAmount.subtract(merchantIncome);
+
+        // 3. 赋值给订单对象
+        order.setMerchantIncome(merchantIncome);
+        order.setPlatformIncome(platformIncome);
+    }
+
 }