{ config, pkgs, ... }:

let
  waybarPath = "${pkgs.waybar}/bin/waybar";

  # Pick the first normal user
  normalUsers = builtins.filter (u: (config.users.users.${u}.isNormalUser or false) != false) (builtins.attrNames config.users.users);
  myUser = if normalUsers == [] then builtins.head (builtins.attrNames config.users.users) else builtins.head normalUsers;

  # Compute UID safely
  myUid = config.users.users.${myUser}.uid;
in
{
  environment.systemPackages = [ pkgs.waybar ];

  systemd.user.services.waybar = {
    description = "Waybar for Hyprland";
    after = [ "graphical-session.target" ];

    serviceConfig = {
      ExecStart = "${waybarPath}";
      Restart = "always";
      Environment = ''
        WAYLAND_DISPLAY=${config.environment.sessionVariables.WAYLAND_DISPLAY or "wayland-0"}
        XDG_CURRENT_DESKTOP=Hyprland
        XDG_RUNTIME_DIR=/run/user/${myUid}
      '';
    };

    wantedBy = [ "default.target" ];
  };
}