{
  config,
  lib,
  pkgs,
  username,
  ...
}:
let
  cfg = config.os.srv.nix-helper;
in
{
  options.os.srv.nix-helper.enable = lib.mkEnableOption "enables nix-helper";
  config = lib.mkIf cfg.enable {
    nix.settings = {
      trusted-users = [
        "root"
        "${username}"
      ];
      experimental-features = [
        "nix-command"
        "flakes"
      ];
    };

    programs.nh = {
      enable = true;
      flake = "/etc/nixos";
      clean.extraArgs = "--keep 5";
    };

    # environment.sessionVariables = {
    #   NH_OS_FLAKE = "/etc/nixos";
    # };

    environment.systemPackages = with pkgs; [
      nix-output-monitor
      nvd
    ];
  };
}