feat: remove shipping settings, use shipping templates for cart calculation

backend/internal/api/handlers/shipping_template.go

@@ -258,3 +258,20 @@ func CalculateShippingFee(templateID *uint, weight float64, quantity int, subtot
 
 	return template.FirstFee + additionalCount*template.AdditionalFee, nil
 }
+
+// CalculateForUser 用户端计算运费接口
+func (h *ShippingTemplateHandler) CalculateForUser(c *gin.Context) {
+	var req schemas.CalculateShippingRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	fee, err := CalculateShippingFee(req.TemplateID, req.Weight, req.Quantity, req.Subtotal, req.Province)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "计算运费失败"})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{"data": gin.H{"shipping_fee": fee}})
+}

backend/internal/api/routes/routes.go

@@ -72,6 +72,7 @@ func SetupRoutes(r *gin.Engine) {
 		api.GET("/settings/public", systemHandler.GetPublicSettings)
 		api.GET("/payment-channels", paymentChannelHandler.PublicList)
 		api.POST("/payment/bepusdt/notify", paymentHandler.BepUsdtNotify)
+		api.POST("/shipping/calculate", shippingTemplateHandler.CalculateForUser)
 
 		authed := api.Group("")
 		authed.Use(middlewares.AuthMiddleware())

backend/internal/schemas/shipping_template.go

@@ -26,4 +26,13 @@ type UpdateShippingTemplateRequest struct {
 	Provinces      []string `json:"provinces"`
 	IsDefault      *bool    `json:"is_default"`
 	SortOrder      *int     `json:"sort_order"`
+}
+
+// CalculateShippingRequest 计算运费请求
+type CalculateShippingRequest struct {
+	TemplateID *uint   `json:"template_id"`
+	Weight     float64 `json:"weight"`
+	Quantity   int     `json:"quantity"`
+	Subtotal   float64 `json:"subtotal"`
+	Province   string  `json:"province"`
 }

frontend/src/api/index.ts

@@ -104,6 +104,10 @@ export const ticketApi = {
   reply: (id: number, data: any) => api.post(`/tickets/${id}/reply`, data),
 }
 
+export const shippingApi = {
+  calculate: (data: any) => api.post('/shipping/calculate', data),
+}
+
 export const supplierApi = {
   getOrders: () => api.get('/supplier/orders'),
   getOrderById: (id: number) => api.get(`/supplier/orders/${id}`),

frontend/src/views/admin/Settings.vue

@@ -5,8 +5,6 @@
         <el-tab-pane label="基础设置">
           <el-form :model="settings" label-width="160px">
             <el-form-item label="渠道费率 (%)"><el-input-number v-model="settings.payment_channel_fee_rate" :precision="2" /></el-form-item>
-            <el-form-item label="首重运费"><el-input-number v-model="settings.shipping_fee_first_weight" :precision="2" /></el-form-item>
-            <el-form-item label="续重单价"><el-input-number v-model="settings.shipping_fee_per_gram" :precision="2" /></el-form-item>
             <el-form-item label="服务费率 (%)"><el-input-number v-model="settings.service_fee_rate" :precision="2" /></el-form-item>
             <el-form-item label="税费 (%)"><el-input-number v-model="settings.tax_rate" :precision="2" /></el-form-item>
             <el-form-item label="邀请奖励积分"><el-input-number v-model="settings.invite_credit_reward" /></el-form-item>
@@ -34,13 +32,11 @@ import { ref, reactive, onMounted } from 'vue'
 import { ElMessage } from 'element-plus'
 import { adminApi } from '../../api'
 
-const settings = reactive<Record<string, any>>({ 
-  payment_channel_fee_rate: 0, 
-  shipping_fee_first_weight: 0, 
-  shipping_fee_per_gram: 0, 
+const settings = reactive<Record<string, any>>({
+  payment_channel_fee_rate: 0,
   service_fee_rate: 0,
   tax_rate: 0,
-  invite_credit_reward: 0 
+  invite_credit_reward: 0
 })
 const verifyEnabled = ref('true')
 const smtp = reactive({ smtp_host: '', smtp_port: '587', smtp_user: '', smtp_password: '', smtp_from: '' })

frontend/src/views/user/Cart.vue

@@ -273,7 +273,7 @@ import {
   Wallet, Coin, ChatDotRound, Delete
 } from '@element-plus/icons-vue'
 import { useCartStore } from '../../store/cart'
-import { systemApi, addressApi, orderApi, paymentChannelApi, userApi } from '../../api'
+import { systemApi, addressApi, orderApi, paymentChannelApi, userApi, shippingApi } from '../../api'
 import { getFirstImage } from '../../utils/image'
 import BackNav from '../../components/BackNav.vue'
 
@@ -346,12 +346,78 @@ const selectedWeight = computed(() => {
     .reduce((sum, item) => sum + (item.product?.weight || 0) * item.quantity, 0)
 })
 
-const shippingFee = computed(() => {
-  const firstWeight = parseFloat(settings.value.shipping_fee_first_weight || '0')
-  const perGram = parseFloat(settings.value.shipping_fee_per_gram || '0')
-  if (selectedTotal.value >= 99 || firstWeight === 0) return 0
-  return firstWeight + perGram * Math.max(0, selectedWeight.value - 500)
-})
+// 运费（使用运费模板计算）
+const shippingFee = ref(0)
+
+// 计算运费
+async function calculateShippingFee() {
+  if (selectedIds.value.length === 0 || !selectedAddressId.value) {
+    shippingFee.value = 0
+    return
+  }
+
+  const selectedItems = items.value.filter(item => selectedIds.value.includes(item.id))
+  const selectedAddress = addresses.value.find(a => a.id === selectedAddressId.value)
+  if (!selectedAddress) {
+    shippingFee.value = 0
+    return
+  }
+
+  // 按运费模板分组计算
+  const templateGroups: Map<number, { weight: number, quantity: number, subtotal: number }> = new Map()
+  let noTemplateWeight = 0, noTemplateQuantity = 0, noTemplateSubtotal = 0
+
+  for (const item of selectedItems) {
+    const templateId = item.product?.shipping_template_id
+    const weight = (item.product?.weight || 0) * item.quantity
+    const subtotal = (item.product?.price || 0) * item.quantity
+
+    if (templateId) {
+      if (!templateGroups.has(templateId)) {
+        templateGroups.set(templateId, { weight: 0, quantity: 0, subtotal: 0 })
+      }
+      const group = templateGroups.get(templateId)!
+      group.weight += weight
+      group.quantity += item.quantity
+      group.subtotal += subtotal
+    } else {
+      noTemplateWeight += weight
+      noTemplateQuantity += item.quantity
+      noTemplateSubtotal += subtotal
+    }
+  }
+
+  let totalFee = 0
+
+  // 计算各模板的运费
+  for (const [templateId, data] of templateGroups) {
+    try {
+      const res: any = await shippingApi.calculate({
+        template_id: templateId,
+        weight: data.weight,
+        quantity: data.quantity,
+        subtotal: data.subtotal,
+        province: selectedAddress.province
+      })
+      totalFee += res.data?.shipping_fee || 0
+    } catch {}
+  }
+
+  // 没有模板的商品使用默认模板
+  if (noTemplateSubtotal > 0) {
+    try {
+      const res: any = await shippingApi.calculate({
+        weight: noTemplateWeight,
+        quantity: noTemplateQuantity,
+        subtotal: noTemplateSubtotal,
+        province: selectedAddress.province
+      })
+      totalFee += res.data?.shipping_fee || 0
+    } catch {}
+  }
+
+  shippingFee.value = totalFee
+}
 
 const serviceFee = computed(() => {
   const rate = parseFloat(settings.value.service_fee_rate || '0')
@@ -379,6 +445,11 @@ const canCheckout = computed(() => {
   return selectedItems.every(item => item.product?.is_active)
 })
 
+// 监听选中商品和地址变化，重新计算运费
+watch([selectedIds, selectedAddressId, items], () => {
+  calculateShippingFee()
+}, { deep: true })
+
 async function fetchSettings() {
   try {
     const res: any = await systemApi.getPublicSettings()