export const ROOT_DOMAIN = `${ROOT}.com`;

export const ROOT_HOSTNAMES = new Set<string>([
  ROOT_DOMAIN,
  "root.localhost:3000",
]);

export const APP_DOMAIN =
  process.env.NEXT_PUBLIC_VERCEL_ENV === "production"
    ? `https://app.${ROOT_DOMAIN}`
    : "http://localhost:3000";

export const APP_HOSTNAMES = new Set<string>([
  `app.${ROOT_DOMAIN}`,
  "localhost:3000",
]);

export function middleware(req: NextRequest) {
  const { domain, path, key } = parse(req);

  // rewrite app to `/app.domain.com` folder
  if (APP_HOSTNAMES.has(domain)) {
    return NextResponse.rewrite(
      new URL(`/app.domain.com${path === "/" ? "" : path}`, req.url),
    );
  }

  // rewrite admin to `/admin.domain.com` folder
  if (ADMIN_HOSTNAMES.has(domain)) {
    return NextResponse.rewrite(
      new URL(`/admin.domain.com${path === "/" ? "" : path}`, req.url),
    );
  }

  // rewrite root to `/domain.com` folder
  if (ROOT_HOSTNAMES.has(domain)) {
    return NextResponse.rewrite(
      new URL(`/domain.com${path === "/" ? "" : path}`, req.url),
    );
  }

  // rewrite everything else to `/[domain]/[slug] dynamic route
  return NextResponse.rewrite(new URL(`/${domain}${path}`, req.url));
}