server.ts

import {CART_QUERY_FRAGMENT} from '~/lib/fragments';
// Virtual entry point for the app
import {
  cartGetIdDefault,
  cartSetIdDefault,
  createCartHandler,
  createCustomerAccountClient,
  createStorefrontClient,
  storefrontRedirect,
} from '@shopify/hydrogen';
import {
  createRequestHandler,
  getStorefrontHeaders,
  type AppLoadContext,
} from '@shopify/remix-oxygen';
// @ts-ignore
import * as remixBuild from 'virtual:remix/server-build';

import {AppSession} from '~/lib/session';

/**
 * Export a fetch handler in module format.
 */
export default {
  async fetch(
    request: Request,
    env: Env,
    executionContext: ExecutionContext,
  ): Promise<Response> {
    try {
      /**
       * Open a cache instance in the worker and a custom session instance.
       */
      if (!env?.SESSION_SECRET) {
        throw new Error('SESSION_SECRET environment variable is not set');
      }

      const waitUntil = executionContext.waitUntil.bind(executionContext);
      const [cache, session] = await Promise.all([
        caches.open('hydrogen'),
        AppSession.init(request, [env.SESSION_SECRET]),
      ]);

      /**
       * Create Hydrogen's Storefront client.
       */
      const {storefront} = createStorefrontClient({
        cache,
        waitUntil,
        i18n: getLocaleFromRequest(request),
        publicStorefrontToken: env.PUBLIC_STOREFRONT_API_TOKEN,
        privateStorefrontToken: env.PRIVATE_STOREFRONT_API_TOKEN,
        storeDomain: env.PUBLIC_STORE_DOMAIN,
        storefrontId: env.PUBLIC_STOREFRONT_ID,
        storefrontHeaders: getStorefrontHeaders(request),
      });

      /**
       * Create a client for Customer Account API.
       */
      const customerAccount = createCustomerAccountClient({
        waitUntil,
        request,
        session,
        customerAccountId: env.PUBLIC_CUSTOMER_ACCOUNT_API_CLIENT_ID,
        customerAccountUrl: env.PUBLIC_CUSTOMER_ACCOUNT_API_URL,
      });

      /*
       * Create a cart handler that will be used to
       * create and update the cart in the session.
       */
      const cart = createCartHandler({
        storefront,
        customerAccount,
        getCartId: cartGetIdDefault(request.headers),
        setCartId: cartSetIdDefault(),
        cartQueryFragment: CART_QUERY_FRAGMENT,
      });

      /**
       * Create a Remix request handler and pass
       * Hydrogen's Storefront client to the loader context.
       */
      const handleRequest = createRequestHandler({
        build: remixBuild,
        mode: process.env.NODE_ENV,
        getLoadContext: (): AppLoadContext => ({
          session,
          storefront,
          customerAccount,
          cart,
          env,
          waitUntil,
        }),
      });

      const response = await handleRequest(request);

      if (response.status === 404) {
        /**
         * Check for redirects only when there's a 404 from the app.
         * If the redirect doesn't exist, then `storefrontRedirect`
         * will pass through the 404 response.
         */
        return storefrontRedirect({request, response, storefront});
      }

      return response;
    } catch (error) {
      // eslint-disable-next-line no-console
      console.error(error);
      return new Response('An unexpected error occurred', {status: 500});
    }
  },
};

// Map directly from subdomains to locale values
export function getLocaleFromRequest(
  request: Pick<Request, 'url'>,
): I18nLocale {
  const defaultLocale: I18nLocale = {language: 'DA', country: 'DK'};

  const supportedLocales = {
    EN: {language: 'EN', country: 'DK'},
    DK: {language: 'DA', country: 'DK'},
    AR: {language: 'AR', country: 'DK'},
  } as Record<string, I18nLocale>;

  const url = new URL(request.url);
  const firstSubdomain = url.hostname.split('.')[0]?.toUpperCase();

  return supportedLocales[firstSubdomain] || defaultLocale;
}