import { NextResponse } from "next/server";
import type { NextRequest } from "next/server";

const LOCALES = ["zh", "en"];
const DEFAULT_LOCALE = "zh";

export function proxy(request: NextRequest) {
  const { pathname } = request.nextUrl;

  const hasLocale = LOCALES.some(
    (locale) => pathname === `/${locale}` || pathname.startsWith(`/${locale}/`)
  );

  if (hasLocale) {
    return NextResponse.next();
  }

  if (pathname.startsWith("/_next") || pathname.startsWith("/api") || pathname.includes(".")) {
    return NextResponse.next();
  }

  const locale = DEFAULT_LOCALE;
  const newUrl = new URL(`/${locale}${pathname === "/" ? "" : pathname}`, request.url);
  return NextResponse.redirect(newUrl);
}

export const config = {
  matcher: ["/((?!_next|api|favicon.ico|.*\\..*).*)"],
};