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 is the app's single entry-point gate (spec
// §2.2): unauthenticated users are sent to /login, and — this is the part
// that used to be missing — authenticated users who are NOT an active,
// explicitly-provisioned HR user are sent to /login too, with an error
// message, instead of being let through. Previously this only checked for
// a Supabase Auth session at all, which meant any signed-in user (even one
// with no profile row, or the old "manager" role) could open the app.
// This UI-layer gate is defense in depth, not the real boundary — every
// table is independently RLS-gated on is_hr_user() regardless of what this
// proxy does.
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) {
    if (isLoginRoute) return response;
    const url = request.nextUrl.clone();
    url.pathname = "/login";
    return NextResponse.redirect(url);
  }

  const { data: profile } = await supabase.from("profiles").select("role, is_active").eq("id", user.id).maybeSingle();
  const isActiveHr = profile?.role === "hr" && profile?.is_active === true;

  if (!isActiveHr) {
    if (isLoginRoute) return response;
    const url = request.nextUrl.clone();
    url.pathname = "/login";
    url.searchParams.set("error", "Kein HR-Zugriff. Bitte wenden Sie sich an eine:n bestehende:n HR-Benutzer:in.");
    return NextResponse.redirect(url);
  }

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

  return response;
}

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