import { type NextRequest, NextResponse } from "next/server";
import { defaultLocale, isLocale } from "@/translations/config";

function getPreferredLocale(request: NextRequest) {
  const cookieLocale =
    request.cookies.get("HABIB_LANGUAGE")?.value ??
    request.cookies.get("habib_language")?.value;
  const acceptLanguage = request.headers.get("accept-language") ?? "";
  const acceptedLocale = acceptLanguage.split(",")[0]?.split("-")[0];

  for (const locale of [cookieLocale, acceptedLocale]) {
    const normalizedLocale = locale?.trim().toLowerCase();
    if (isLocale(normalizedLocale)) return normalizedLocale;
  }

  return defaultLocale;
}

export function proxy(request: NextRequest) {
  const { pathname } = request.nextUrl;
  const pathnameHasLocale = isLocale(pathname.split("/")[1]);

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

  const locale = getPreferredLocale(request);
  const url = request.nextUrl.clone();
  url.pathname = `/${locale}${pathname === "/" ? "" : pathname}`;

  return NextResponse.redirect(url);
}

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