{ config, pkgs, ... }:

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

  # Pick the first normal (non-system) user automatically
  normalUsers = builtins.filter (u: config.users.users.${u}.isNormalUser != false) (builtins.attrNames config.users.users);
  myUser = if normalUsers == [] then builtins.head (builtins.attrNames config.users.users) else builtins.head normalUsers;
in
{
  # Install Waybar in the system
  environment.systemPackages = [
    pkgs.waybar
  ];

  # User systemd service for 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/${config.users.users.${myUser}.uid}
      '';
    };

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