Show a delivery window on the orders table

app/(logged-in)/org/[slug]/orders/components/orders-columns.tsx

@@ -22,7 +22,7 @@ import {
   DropdownMenuTrigger,
 } from '@/components/ui/dropdown-menu';
 
-import { statusColors } from '../utils';
+import { deliveryWindow, statusColors } from '../utils';
 
 // Infer OrderWithDetails from tRPC router output
 type RouterOutput = inferRouterOutputs<AppRouter>;
@@ -139,6 +139,15 @@ export function getOrderColumns(
       ),
       cell: ({ row }) => formatDate(row.original.orderDate),
     },
+    {
+      id: 'delivery',
+      header: () => <DataTableColumnHeader title="Delivery" />,
+      cell: ({ row }) => {
+        const window = deliveryWindow(row.original.status, row.original.orderDate);
+        if (!window) return <span className="text-muted-foreground">—</span>;
+        return `${formatDate(window[0])} – ${formatDate(window[1])}`;
+      },
+    },
     {
       id: 'actions',
       enableHiding: false,

app/(logged-in)/org/[slug]/orders/utils.ts

@@ -23,3 +23,33 @@ export const statusColors: Record<OrderStatus, string> = {
 };
 
 export const MAX_AMOUNT = 10000;
+
+/** Working days a parcel spends with the carrier once it has shipped. */
+const TRANSIT_DAYS = 3;
+
+/** Working days an order still needs to leave the warehouse, by status. */
+const LEAD_DAYS: Partial<Record<OrderStatus, number>> = {
+  pending: 2,
+  processing: 1,
+  shipped: 0,
+};
+
+/**
+ * The window an order should arrive in, or null once it is delivered or
+ * cancelled. Orders that have not shipped add the days they still need to
+ * leave the warehouse.
+ */
+export function deliveryWindow(status: OrderStatus, orderDate: Date): [Date, Date] | null {
+  if (status === 'delivered' || status === 'cancelled') return null;
+  const from = addWorkingDays(orderDate, (LEAD_DAYS[status] ?? 0) + TRANSIT_DAYS);
+  return [from, addWorkingDays(from, 2)];
+}
+
+function addWorkingDays(date: Date, days: number): Date {
+  const out = new Date(date);
+  for (let left = days; left > 0; ) {
+    out.setDate(out.getDate() + 1);
+    if (out.getDay() !== 0 && out.getDay() !== 6) left -= 1;
+  }
+  return out;
+}