{
  pkgs,
  lib,
  config,
  ...
}:
with lib;
let
  gui = with config.global.gpu; enable && session;
  catppuccin = config.home.catppuccin;
in
{
  config = {
    users.homeModules = [
      # this module passes gui configuration to home-manager
      { passthrough.gui = gui; }
    ];
    users.adminGroups = mkIf gui [ "video" ];

    # themes and icons
    environment.systemPackages =
      with pkgs;
      mkIf gui (
        [
          papirus-icon-theme
        ]
        ++ optionals (!catppuccin.enable) [
          whitesur-gtk-theme
          whitesur-icon-theme
          bibata-cursors
        ]
      );

    fonts.enableDefaultPackages = mkIf gui true;

    security = mkIf gui {
      polkit.enable = true;
    };
    programs = mkIf gui {
      dconf.enable = true;
    };
    services = mkIf gui {
      blueman.enable = !config.global.flatpak.enable;
    };
  };
}