init

apps/api/src/orders/update-order-item.ts

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+import type { DatabaseContext } from "../db/database";
+import { canEditOrderItems } from "./order-status";
+import { appendAuditEvent, findOrderDetail, findOrderItemRecord, updateOrderItemQuantity, updateOrderTimestamp } from "./order-repository";
+
+export async function changeOrderItemQuantity(
+  context: DatabaseContext,
+  input: {
+    orderId: string;
+    itemId: string;
+    quantity: number;
+    actor: string;
+  }
+) {
+  const row = await findOrderItemRecord(context, input.orderId, input.itemId);
+
+  if (!row) {
+    return { statusCode: 404, message: "Order item not found." } as const;
+  }
+
+  if (!canEditOrderItems(row.order.status as never)) {
+    return { statusCode: 400, message: "Order items cannot be changed for this order status." } as const;
+  }
+
+  if (input.quantity < 1 || input.quantity > 10) {
+    return { statusCode: 400, message: "Quantity must be between 1 and 10." } as const;
+  }
+
+  const available = (row.inventory?.availableQuantity ?? 0) + row.item.quantity;
+
+  if (input.quantity > available) {
+    return { statusCode: 400, message: "Requested quantity exceeds available inventory." } as const;
+  }
+
+  const updatedAt = new Date().toISOString();
+  await updateOrderItemQuantity(context, input.itemId, input.quantity);
+  await updateOrderTimestamp(context, input.orderId, updatedAt);
+  await appendAuditEvent(context, {
+    orderId: input.orderId,
+    actor: input.actor,
+    type: "order.item.quantity_changed",
+    message: `Updated item ${input.itemId} quantity to ${input.quantity}.`,
+    createdAt: updatedAt
+  });
+
+  return {
+    statusCode: 200,
+    order: await findOrderDetail(context, input.orderId)
+  } as const;
+}