import { NextResponse } from "next/server";
import type { NextRequest } from "next/server";
import { match as matchLocale } from "@formatjs/intl-localematcher";
import Negotiator from "negotiator";

const locales = ["en", "ru"];
const defaultLocale = "en";

function getLocale(request: NextRequest): string {
  const negotiatorHeaders: Record<string, string> = {};
  request.headers.forEach((value, key) => (negotiatorHeaders[key] = value));

  const languages = new Negotiator({ headers: negotiatorHeaders }).languages();

  try {
    return matchLocale(languages, locales, defaultLocale);
  } catch (e) {
    return defaultLocale;
  }
}

// Изменили название с middleware на proxy и добавили export
export function proxy(request: NextRequest) {
  const { pathname } = request.nextUrl;

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

  if (pathnameHasLocale) return;

  const locale = getLocale(request);
  request.nextUrl.pathname = `/${locale}${pathname}`;

  return NextResponse.redirect(request.nextUrl);
}

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