toggle screen for product configurations

Frontend/erp-system/lib/api/categories.ts

@@ -49,6 +49,16 @@ export const categoriesApi = {
     if (!name) return Promise.reject(new Error("Category name is required."))
     const category = mockCategories.find((c) => c.categoryId === categoryId)
     if (!category) return Promise.reject(new Error("Category not found."))
+    if (request.parentId !== undefined) {
+      const parentId = request.parentId
+      if (parentId === categoryId) {
+        return Promise.reject(new Error("A category cannot be its own parent."))
+      }
+      if (parentId !== null && !mockCategories.some((c) => c.categoryId === parentId)) {
+        return Promise.reject(new Error("Selected parent category does not exist."))
+      }
+      category.parentId = parentId
+    }
     category.name = name
     return mockDelay(category)
   },

Frontend/erp-system/lib/api/mock-data.ts

@@ -4,6 +4,7 @@
 import { Bin, Brand, Category, Item, Uom, Vendor, VariantCategory, Warehouse } from "@/types/master-data"
 import { PurchaseOrder, Quotation, Requisition, Rfq, PurchaseReturn } from "@/types/procurement"
 import { Grn } from "@/types/grn"
+import { ProductConfig } from "@/types/settings"
 import {
   AdjustmentStatus,
   CountStatus,
@@ -14,6 +15,26 @@ import {
   TransferStatus,
 } from "@/types/stock"
 
+// Company-level Product Configuration (Settings → Product Configuration). Off by
+// default except the tracking-related toggles, matching the shipped design.
+export const mockProductConfig: ProductConfig = {
+  subcategories: false,
+  brands: false,
+  productImages: false,
+  serialNumbers: true,
+  batchLotTracking: true,
+  expiryMfgDates: true,
+  warranty: true,
+  serviceItems: true,
+  adHocSaleLines: true,
+  minPriceFloor: false,
+  maxPriceCeiling: false,
+  freePricingProducts: false,
+  fractionalQuantities: false,
+  packConversion: true,
+  allowNegativeStock: false,
+}
+
 export const mockWarehouses: Warehouse[] = [
   { warehouseId: 1, code: "WH-MAIN", name: "Main Warehouse - Negombo" },
   { warehouseId: 2, code: "WH-COLOMBO", name: "Colombo Distribution Center" },

Frontend/erp-system/lib/api/product-config.ts

@@ -0,0 +1,16 @@
+// Product Configuration client, mirroring lib/api/brands.ts. A single company-level
+// settings object rather than a list — in-memory sample data (lib/api/mock-data.ts),
+// no backend API calls.
+import { ProductConfig, UpdateProductConfigRequest } from "@/types/settings"
+import { mockDelay, mockProductConfig } from "@/lib/api/mock-data"
+
+export const productConfigApi = {
+  get(): Promise<ProductConfig> {
+    return mockDelay({ ...mockProductConfig })
+  },
+
+  update(request: UpdateProductConfigRequest): Promise<ProductConfig> {
+    Object.assign(mockProductConfig, request)
+    return mockDelay({ ...mockProductConfig })
+  },
+}