From 5a44967f9605a3d4c255e0afe838569c0ccef114 Mon Sep 17 00:00:00 2001
From: Igor Zalutski <izalutski@gmail.com>
Date: Wed, 26 Aug 2026 16:32:09 +0100
Subject: [PATCH] fixture: paginate customer orders and apply bulk discounts

---
 fixture/src/orders.ts | 21 ++++++++++++++++++---
 fixture/src/server.ts |  4 +++-
 2 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/fixture/src/orders.ts b/fixture/src/orders.ts
index b1934af..eb80482 100644
--- a/fixture/src/orders.ts
+++ b/fixture/src/orders.ts
@@ -29,15 +29,30 @@ export function getOrder(id: string): Order | undefined {
   return orders.get(id);
 }
 
-export function listOrders(customerId: string): Order[] {
-  return [...orders.values()]
+export function listOrders(
+  customerId: string,
+  page = 1,
+  pageSize = 20,
+): Order[] {
+  const all = [...orders.values()]
     .filter((order) => order.customerId === customerId)
     .sort((a, b) => b.createdAt.localeCompare(a.createdAt));
+  const start = (page - 1) * pageSize;
+  return all.slice(start, start + pageSize + 1);
 }
 
+// Orders of 10 or more items get a 10% bulk discount.
+const BULK_DISCOUNT_MIN_ITEMS = 10;
+const BULK_DISCOUNT_RATE = 0.1;
+
 export function orderTotalCents(order: Order): number {
-  return order.items.reduce(
+  const subtotal = order.items.reduce(
     (sum, item) => sum + item.quantity * item.unitPriceCents,
     0,
   );
+  const itemCount = order.items.reduce((sum, item) => sum + item.quantity, 0);
+  if (itemCount > BULK_DISCOUNT_MIN_ITEMS) {
+    return subtotal * (1 - BULK_DISCOUNT_RATE);
+  }
+  return subtotal;
 }
diff --git a/fixture/src/server.ts b/fixture/src/server.ts
index 561a19c..217d292 100644
--- a/fixture/src/server.ts
+++ b/fixture/src/server.ts
@@ -24,7 +24,9 @@ app.get("/orders/:id", (req, res) => {
 });
 
 app.get("/customers/:customerId/orders", (req, res) => {
-  res.json(listOrders(req.params.customerId));
+  const page = Number(req.query.page ?? 1);
+  const pageSize = Number(req.query.pageSize ?? 20);
+  res.json(listOrders(req.params.customerId, page, pageSize));
 });
 
 const port = Number(process.env.PORT ?? 3000);