fixed issue in order cancellation

tests/representative-invoice.test.ts

@@ -0,0 +1,63 @@
+import { strict as assert } from "node:assert";
+import { describe, it } from "node:test";
+
+import {
+  buildRepresentativeInvoiceMap,
+  type RepresentativeInvoiceRow,
+} from "../app/services/invoice/representativeInvoice";
+
+const d = (iso: string) => new Date(iso);
+
+describe("buildRepresentativeInvoiceMap", () => {
+  it("prefers the active invoice even when a cancelled row has a higher version (regression: order #1032)", () => {
+    // Rows as returned by Prisma: version desc, then createdAt desc.
+    // This mirrors the real #1032 state: a cancelled v8 sorted ahead of the
+    // live, issued v7. The naive "first row wins" picked v8 and the order
+    // rendered as if it had no invoice.
+    const rows: RepresentativeInvoiceRow[] = [
+      { orderId: "gid://shopify/Order/1032", version: 8, cancelledAt: d("2026-05-31T08:59:05Z") },
+      { orderId: "gid://shopify/Order/1032", version: 7, cancelledAt: null },
+      { orderId: "gid://shopify/Order/1032", version: 1, cancelledAt: d("2026-05-15T13:05:14Z") },
+    ];
+
+    const map = buildRepresentativeInvoiceMap(rows);
+    const rep = map.get("gid://shopify/Order/1032");
+
+    assert.ok(rep, "expected a representative invoice");
+    assert.equal(rep!.version, 7, "should select the active v7, not the cancelled v8");
+    assert.equal(rep!.cancelledAt, null);
+  });
+
+  it("falls back to the latest cancelled invoice when none are active", () => {
+    const rows: RepresentativeInvoiceRow[] = [
+      { orderId: "gid://shopify/Order/1", version: 3, cancelledAt: d("2026-05-31T10:00:00Z") },
+      { orderId: "gid://shopify/Order/1", version: 1, cancelledAt: d("2026-05-15T10:00:00Z") },
+    ];
+
+    const rep = buildRepresentativeInvoiceMap(rows).get("gid://shopify/Order/1");
+    assert.ok(rep);
+    assert.equal(rep!.version, 3, "highest-version cancelled wins when nothing is active");
+  });
+
+  it("keeps the highest-version active invoice when multiple are active", () => {
+    const rows: RepresentativeInvoiceRow[] = [
+      { orderId: "gid://shopify/Order/2", version: 5, cancelledAt: null },
+      { orderId: "gid://shopify/Order/2", version: 4, cancelledAt: null },
+    ];
+
+    const rep = buildRepresentativeInvoiceMap(rows).get("gid://shopify/Order/2");
+    assert.equal(rep!.version, 5);
+  });
+
+  it("handles multiple orders independently", () => {
+    const rows: RepresentativeInvoiceRow[] = [
+      { orderId: "A", version: 9, cancelledAt: d("2026-05-31T00:00:00Z") },
+      { orderId: "A", version: 2, cancelledAt: null },
+      { orderId: "B", version: 1, cancelledAt: null },
+    ];
+
+    const map = buildRepresentativeInvoiceMap(rows);
+    assert.equal(map.get("A")!.version, 2);
+    assert.equal(map.get("B")!.version, 1);
+  });
+});