{ config, lib, pkgs, namespace, options, ... }:

let
  desktop-environment = config.${namespace}.desktop-environment;
  xfce = config.${namespace}.desktop-environment.xfce;
  gnome = config.${namespace}.desktop-environment.gnome;
  plasma = config.${namespace}.desktop-environment.plasma;
in {

  options.${namespace}.desktop-environment = lib.mkOption {
    type = lib.types.attrsOf lib.types.any;
    description = "Configuration options for desktop environments.";
    default = { };
    xfce = {
      enable = lib.mkEnableOption "Enable xfce desktop environment.";
    };
    gnome = {
      enable = lib.mkEnableOption "Enable gnome desktop environment.";
    };
    plasma = {
      enable = lib.mkEnableOption "Enable plasma desktop environment.";
    };
  };
  config = lib.mkIf xfce.enable {
    xserver = {
      enable = true; # Enable the deprecated X11 teletype terminal connection system. 
      desktopManager = {
        xfce.enable = true;
      };
    };
    environment.systemPackages = with pkgs; [
      xfce.xfce4-goodies
      xfce.xfce4-pulseaudio-plugin
      xfce.xfce4-clipman-plugin
      xfce.xfce4-screenshooter
      xfce.xfce4-whiskermenu-plugin
      thunar-archive-plugin
      thunar-volman
      gvfs
      gvfs-mtp
      gvfs-afc
      gvfs-goa
      gnome-keyring
      libgnome-keyring
    ];
  } ++ lib.mkIf gnome.enable {

    desktopManager.gnome.enable = true;
    environment.systemPackages = with pkgs; [
      gnome-tweaks
      gnome-software
      gnomeExtensions.pop-shell
      gnome-remote-desktop
    ];

  } ++ lib.mkIf plasma.enable {

    desktopManager.plasma6.enable = true;
    environment.systemPackages = with pkgs kdePackages; [

      kdePackages.qtwebsockets
      kdePackages.qtwebchannel
      kdePackages.korganizer
      kdePackages.akonadi
      kdePackages.akonadi-calendar
      kdePackages.akonadi-contacts
      kdePackages.kaddressbook
      kdePackages.kmail
      kdePackages.kdepim-runtime
      kdePackages.kontact
      kdePackages.kidentitymanagement
      kdePackages.libkdepim
      kdePackages.kwin
      kdePackages.plasma-workspace

      plasma.plasma-desktop
      plasma.plasma-nm
      plasma.plasma-pa
      
      gnome-keyring
      libgnome-keyring
    ];

  };

}