init

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

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+import type { DatabaseContext } from "../db/database";
+import { canCancelOrder } from "./order-status";
+import { appendAuditEvent, findOrderDetail, updateOrderStatus } from "./order-repository";
+
+export async function cancelOrder(
+  context: DatabaseContext,
+  input: {
+    orderId: string;
+    actor: string;
+    reason?: string;
+  }
+) {
+  const order = await findOrderDetail(context, input.orderId);
+
+  if (!order) {
+    return { statusCode: 404, message: "Order not found." } as const;
+  }
+
+  if (!canCancelOrder(order.status)) {
+    return { statusCode: 400, message: "Order cannot be cancelled for this order status." } as const;
+  }
+
+  const updatedAt = new Date().toISOString();
+  await updateOrderStatus(context, input.orderId, "cancelled", updatedAt);
+  await appendAuditEvent(context, {
+    orderId: input.orderId,
+    actor: input.actor,
+    type: "order.cancelled",
+    message: input.reason?.trim() ? `Cancelled order. Reason: ${input.reason.trim()}` : "Cancelled order.",
+    createdAt: updatedAt
+  });
+
+  return {
+    statusCode: 200,
+    order: await findOrderDetail(context, input.orderId)
+  } as const;
+}