{ pkgs, config, lib, stylix, ... }:

let
  # Resolve the user from host configuration
  username = config.defaultUser or "henrov";
in
{
  #################################
  # System-wide GTK packages
  #################################
  environment.systemPackages = with pkgs; [
    gtk3
    gtk4
  ];

  #################################
  # Home Manager GTK configuration
  #################################
  home-manager.users = lib.recursiveUpdate (config.home-manager.users or {}) {
    "${username}" = {
      gtk = {
        enable = true;

        # GTK theme
        theme = {
          name    = "Catppuccin-Mocha-Standard-Blue-Dark";
          package = pkgs.magnetic-catppuccin-gtk;
        };

        # Icon theme
        iconTheme = {
          name    = "Papirus-Dark";
          package = pkgs.papirus-icon-theme;
        };

        # Extra GTK3 / GTK4 settings
        gtk3.extraConfig = {
          "gtk-application-prefer-dark-theme" = 1;
        };
        gtk4.extraConfig = {
          "gtk-application-prefer-dark-theme" = 1;
        };
      };
    };
  };
}