update:item quantity change conditional

Reviewed-on: #12

CONTRIBUTING.md

@@ -28,7 +28,6 @@ bun run dev:web
 Common checks:
 
 ```bash
-bun run check
 bun run test
 bun run build:web
 ```

apps/api/src/orders/order-quantity-assignment-3.test.ts

@@ -0,0 +1,91 @@
+import { afterEach, beforeEach, describe, expect, test } from "bun:test";
+import type { AppWithContext } from "../app";
+import { buildApp } from "../app";
+import { createUser } from "../users/user-repository";
+
+let app: AppWithContext;
+let employeeCookie = "";
+
+function firstHeader(value: string | string[] | undefined) {
+  return Array.isArray(value) ? value[0] : value ?? "";
+}
+
+async function login(username: string) {
+  const response = await app.inject({ method: "POST", url: "/api/login", payload: { username } });
+  return firstHeader(response.headers["set-cookie"]);
+}
+
+beforeEach(async () => {
+  app = await buildApp(":memory:");
+
+  await createUser(app.dbContext, {
+    username: "dev-employee",
+    name: "Dev Employee",
+    email: "dev.employee@example.com",
+    role: "employee"
+  });
+
+  employeeCookie = await login("dev-employee");
+});
+
+afterEach(async () => {
+  await app.close();
+});
+
+describe("assignment 3 quantity validation", () => {
+  test("allows quantity changes for pending orders", async () => {
+    const response = await app.inject({
+      method: "POST",
+      url: "/api/orders/order_1/items/item_1/quantity",
+      headers: { cookie: employeeCookie },
+      payload: { quantity: 5 }
+    });
+
+    expect(response.statusCode).toBe(200);
+    expect(response.json().items.find((item: { id: string }) => item.id === "item_1")?.quantity).toBe(5);
+  });
+
+  test("rejects quantity changes for processing orders", async () => {
+    const response = await app.inject({
+      method: "POST",
+      url: "/api/orders/order_2/items/item_3/quantity",
+      headers: { cookie: employeeCookie },
+      payload: { quantity: 2 }
+    });
+
+    expect(response.statusCode).toBe(400);
+  });
+
+  test("rejects quantity changes for shipped orders", async () => {
+    const response = await app.inject({
+      method: "POST",
+      url: "/api/orders/order_3/items/item_4/quantity",
+      headers: { cookie: employeeCookie },
+      payload: { quantity: 1 }
+    });
+
+    expect(response.statusCode).toBe(400);
+  });
+
+  test("rejects quantity outside the allowed range", async () => {
+    const response = await app.inject({
+      method: "POST",
+      url: "/api/orders/order_1/items/item_1/quantity",
+      headers: { cookie: employeeCookie },
+      payload: { quantity: 0 }
+    });
+
+    expect(response.statusCode).toBe(400);
+  });
+
+  test("rejects quantity above effective inventory", async () => {
+    const response = await app.inject({
+      method: "POST",
+      url: "/api/orders/order_1/items/item_1/quantity",
+      headers: { cookie: employeeCookie },
+      payload: { quantity: 9 }
+    });
+
+    expect(response.statusCode).toBe(400);
+  });
+});

apps/api/src/orders/order-status.ts

@@ -1,7 +1,7 @@
 import type { OrderStatus } from "@orderops/shared/order-status";
 
 export function canEditOrderItems(status: OrderStatus) {
-  return status === "pending" || status === "processing";
+  return status === "pending";
 }
 
 export function canEditShippingAddress(status: OrderStatus) {

apps/web/src/orders/order-page.tsx

@@ -72,6 +72,19 @@ export function OrderPage() {
     }
   }
 
+  async function handleUpdateQuantity(itemId: string, quantity: number) {
+    if (!order) {
+      return;
+    }
+
+    if (order.status !== "pending") {
+      setToast({ message: "Order items cannot be changed for this order status.", variant: "error" });
+      return;
+    }
+
+    await runAction(() => updateOrderItemQuantity(order.id, itemId, quantity), "Quantity saved.");
+  }
+
   return (
     <div className="space-y-4">
       <Link className="inline-flex text-sm font-medium text-blue-600 hover:text-blue-700" to="/orders">
@@ -84,7 +97,7 @@ export function OrderPage() {
         <OrderDetailPage
           order={order}
           auditEvents={auditEvents}
-          onUpdateQuantity={(itemId, quantity) => runAction(() => updateOrderItemQuantity(order.id, itemId, quantity), "Quantity saved.")}
+          onUpdateQuantity={handleUpdateQuantity}
           onSaveAddress={(address: Address) => runAction(() => updateShippingAddress(order.id, address), "Shipping address saved.")}
           onSaveNotes={(notes) => runAction(() => updateOrderNotes(order.id, notes), "Notes saved.")}
           onCancel={() => runAction(() => cancelOrder(order.id), "Order cancelled.")}