import createMiddleware from "next-intl/middleware";
import { NextResponse } from "next/server";
import type { NextRequest } from "next/server";
import { routing } from "./src/i18n/routing";

const oldSerbianPaths = ["", "products", "about", "contact", "checkout"];

export default function middleware(request: NextRequest) {
  const pathname = request.nextUrl.pathname;

  const isOldSerbianPath = oldSerbianPaths.some((path) => {
    if (path === "") {
      return pathname === "/";
    }
    return pathname === `/${path}` || pathname.startsWith(`/${path}/`);
  });

  const hasLocalePrefix = routing.locales.some(
    (locale) => pathname === `/${locale}` || pathname.startsWith(`/${locale}/`)
  );

  if (isOldSerbianPath && !hasLocalePrefix) {
    const newPathname = pathname === "/"
      ? "/sr"
      : `/sr${pathname}`;
    
    const url = request.nextUrl.clone();
    url.pathname = newPathname;
    
    return NextResponse.redirect(url, 301);
  }

  const intlMiddleware = createMiddleware({
    ...routing,
  });

  return intlMiddleware(request);
}

export const config = {
  matcher: [
    "/",
    "/(sr|en|de|fr)/:path*",
    "/((?!api|_next|_vercel|.*\\..*).*)",
  ],
};