metatrondelivery/app/routes/webhooks.orders.cancelled.tsx

import type { ActionFunctionArgs } from "@remix-run/node";
import { authenticate } from "../shopify.server";
import db from "../db.server";
import { writeCheckoutSnapshot } from "../services/checkout-snapshot.server";

// Marks the linked Booking cancelled, which frees its capacity for
// getAvailability()/the hold endpoint's confirmedCount check on the next
// request — see IMPLEMENTATION_PLAN.md §5.2.
export const action = async ({ request }: ActionFunctionArgs) => {
  const { shop, topic, payload, admin } = await authenticate.webhook(request);
  console.log(`Received ${topic} webhook for ${shop}`);

  const order = payload as unknown as { admin_graphql_api_id: string };
  await db.booking.updateMany({
    where: { shopDomain: shop, orderId: order.admin_graphql_api_id },
    data: { status: "cancelled" },
  });

  // Capacity just freed up — the checkout snapshot must reflect it so the
  // Validation Function stops blocking a slot that's now open again.
  if (admin) {
    await writeCheckoutSnapshot(admin, shop);
  }

  return new Response();
};