import type { ActionFunctionArgs } from "react-router";
import { authenticate } from "../shopify.server";
import db from "../db.server";
import {
  generateAndEmailInvoice,
  isManualPaymentOrder,
} from "../services/invoice/automations.server";
import { isDuplicateWebhook } from "../services/webhooks/dedupe.server";
import { runWebhookInBackground } from "../services/webhooks/background.server";

/**
 * orders/fulfilled — Automation 2: when an order is fulfilled and is NOT a
 * wire-transfer (manual-payment-gateway) order, automatically email the
 * invoice to the customer. Manual-gateway orders are intentionally skipped
 * because Automation 1 already emailed them at order-create time.
 */
export const action = async ({ request }: ActionFunctionArgs) => {
  const { shop, topic, payload, session, admin } = await authenticate.webhook(request);
  console.log(`Received ${topic} webhook for ${shop}`);

  // Idempotency against Shopify retries — see webhooks/dedupe.server.ts.
  if (await isDuplicateWebhook(request, shop, topic)) return new Response();

  if (!session || !admin) {
    // App was uninstalled before the webhook drained — nothing to do.
    return new Response();
  }

  const orderId = payload?.id;
  if (orderId == null) return new Response();

  const customerLocale =
    typeof payload?.customer_locale === "string" ? payload.customer_locale : undefined;

  // Respond fast; do the heavy lifting after the response (see notes in
  // webhooks.orders.create.tsx for the rationale).
  runWebhookInBackground(`${topic} order=${orderId} shop=${shop}`, async () => {
    const settings = await db.shopSettings.findUnique({ where: { shopDomain: shop } });
    if (!settings?.autoEmailOnFulfilledNonWireTransfer) return;

    const orderGid = `gid://shopify/Order/${String(orderId).replace(/^.*\//, "")}`;
    if (await isManualPaymentOrder(admin, orderGid)) {
      // Manual / wire-transfer order — handled by Automation 1, skip here.
      return;
    }

    const result = await generateAndEmailInvoice({
      shopDomain: shop,
      admin,
      orderId,
      customerLocale,
    });
    if (!result.ok) {
      console.warn(`auto-email (fulfilled) failed for order ${orderId} on ${shop}: ${result.reason}`);
    }
  });

  return new Response();
};
