feat(buyer-tasks): GET /api/v1/buyer-tasks route

Co-authored-by: Orca <help@stably.ai>

src/app/api/v1/buyer-tasks/route.test.ts

@@ -0,0 +1,63 @@
+import { describe, it, expect, beforeEach, vi } from "vitest";
+
+vi.mock("@/lib/server/buyer-tasks-service", () => ({
+  listBuyerTasks: vi.fn(),
+}));
+
+import { GET } from "./route";
+import { listBuyerTasks } from "@/lib/server/buyer-tasks-service";
+
+function makeRequest(tab: string | null) {
+  const url = tab ? `http://test/api/v1/buyer-tasks?tab=${tab}` : "http://test/api/v1/buyer-tasks";
+  return new Request(url);
+}
+
+describe("GET /api/v1/buyer-tasks", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("returns groups for valid tab", async () => {
+    vi.mocked(listBuyerTasks).mockResolvedValue([
+      {
+        groupId: "order-1::sup-1",
+        orderId: "order-1",
+        orderNumber: "ORD-001",
+        supplierId: "sup-1",
+        supplierName: "Steel Co",
+        customerName: "J. Smith",
+        companyName: "Acme",
+        items: [],
+        itemCount: 1,
+        totalCost: 50,
+        purchaseOrderId: null,
+        poStatus: null,
+        step: "needs_po",
+      },
+    ]);
+
+    const res = await GET(makeRequest("needs_po") as never);
+    expect(res.status).toBe(200);
+    const body = await res.json();
+    expect(body.groups).toHaveLength(1);
+    expect(body.groups[0].supplierName).toBe("Steel Co");
+  });
+
+  it("returns 400 on invalid tab", async () => {
+    const res = await GET(makeRequest("invalid") as never);
+    expect(res.status).toBe(400);
+    const body = await res.json();
+    expect(body.error).toMatch(/tab/i);
+  });
+
+  it("returns 400 when tab is missing", async () => {
+    const res = await GET(makeRequest(null) as never);
+    expect(res.status).toBe(400);
+  });
+
+  it("returns 500 on service error", async () => {
+    vi.mocked(listBuyerTasks).mockRejectedValue(new Error("PB down"));
+    const res = await GET(makeRequest("needs_po") as never);
+    expect(res.status).toBe(500);
+  });
+});

src/app/api/v1/buyer-tasks/route.ts

@@ -0,0 +1,29 @@
+import { NextRequest, NextResponse } from "next/server";
+import { listBuyerTasks, type BuyerTaskTab } from "@/lib/server/buyer-tasks-service";
+
+const VALID_TABS: BuyerTaskTab[] = ["needs_po", "po_draft", "po_sent"];
+
+export async function GET(req: NextRequest | Request) {
+  // NextRequest exposes a parsed `nextUrl`; a plain Request (used in
+  // unit tests with `new Request(url)`) doesn't. Fall back to parsing
+  // `req.url` so both shapes work.
+  const tab = (req as NextRequest).nextUrl?.searchParams?.get("tab")
+    ?? new URL(req.url).searchParams.get("tab");
+
+  if (!tab || !VALID_TABS.includes(tab as BuyerTaskTab)) {
+    return NextResponse.json(
+      { error: "Invalid or missing 'tab' parameter" },
+      { status: 400 }
+    );
+  }
+
+  try {
+    const groups = await listBuyerTasks(tab as BuyerTaskTab);
+    return NextResponse.json({ groups });
+  } catch (err) {
+    return NextResponse.json(
+      { error: err instanceof Error ? err.message : "Failed to load buyer tasks" },
+      { status: 500 }
+    );
+  }
+}