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

export async function middleware(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: any[]) {
          cookiesToSet.forEach(({ name, value, options }) =>
            request.cookies.set(name, value)
          );
          supabaseResponse = NextResponse.next({
            request,
          });
          cookiesToSet.forEach(({ name, value, options }) =>
            supabaseResponse.cookies.set(name, value, options)
          );
        },
      },
    }
  );

  // IMPORTANT: This refreshes the session.
  // If the user is not logged in, 'user' will be null.
  const { data: { user } } = await supabase.auth.getUser();

  const isTeacherRoute = request.nextUrl.pathname.startsWith("/teacher");
  // Practice mini-games are public; auth is handled in server actions for persistence only.
  const isProtectedRoute = isTeacherRoute;

  // If they are trying to access a protected route and aren't logged in, redirect to login
  if (isProtectedRoute && !user) {
    const url = request.nextUrl.clone();
    url.pathname = "/auth/login";
    url.searchParams.set("redirectTo", request.nextUrl.pathname);
    return NextResponse.redirect(url);
  }

  return supabaseResponse;
}

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