frontend/src/proxy.ts

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

export async function proxy(request: NextRequest) {
  let supabaseResponse = 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)
          );
          supabaseResponse = NextResponse.next({ request });
          cookiesToSet.forEach(({ name, value, options }) =>
            supabaseResponse.cookies.set(name, value, options)
          );
        },
      },
    }
  );

  // Refresh session — required for Server Components to read the session
  const { data: { user } } = await supabase.auth.getUser();

  const { pathname } = request.nextUrl;
  const isDashboard = pathname.startsWith("/dashboard");
  const isLogin     = pathname.startsWith("/login");

  // Protect dashboard — redirect unauthenticated users to /login
  if (isDashboard && !user) {
    const redirectUrl = request.nextUrl.clone();
    redirectUrl.pathname = "/login";
    return NextResponse.redirect(redirectUrl);
  }

  // Redirect logged-in users away from /login
  if (isLogin && user) {
    const redirectUrl = request.nextUrl.clone();
    redirectUrl.pathname = "/dashboard";
    return NextResponse.redirect(redirectUrl);
  }

  return supabaseResponse;
}

export const config = {
  matcher: [
    "/((?!_next/static|_next/image|favicon.ico|.*\\.(?:svg|png|jpg|jpeg|gif|webp)$).*)",
  ],
};