import { createServerClient } from "@supabase/ssr";
import { NextResponse, type NextRequest } from "next/server";

// Next.js 16 renamed Middleware to Proxy (same mechanism, new filename/export).
// This performs the optimistic auth check: redirect unauthenticated users to
// /login, and signed-in users away from /login. Real authorization (hr_admin
// vs manager) is enforced server-side via RLS, not here.
export async function proxy(request: NextRequest) {
  let response = NextResponse.next({ request });

  const supabase = createServerClient(
    process.env.NEXT_PUBLIC_SUPABASE_URL!,
    process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!,
    {
      cookies: {
        getAll() {
          return request.cookies.getAll();
        },
        setAll(cookiesToSet) {
          cookiesToSet.forEach(({ name, value }) => request.cookies.set(name, value));
          response = NextResponse.next({ request });
          cookiesToSet.forEach(({ name, value, options }) => response.cookies.set(name, value, options));
        },
      },
    }
  );

  const {
    data: { user },
  } = await supabase.auth.getUser();

  const isLoginRoute = request.nextUrl.pathname.startsWith("/login");

  if (!user && !isLoginRoute) {
    const url = request.nextUrl.clone();
    url.pathname = "/login";
    return NextResponse.redirect(url);
  }

  if (user && isLoginRoute) {
    const url = request.nextUrl.clone();
    url.pathname = "/";
    return NextResponse.redirect(url);
  }

  return response;
}

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