{ config, lib, pkgs, ... }:
lib.mkMerge [
/*

https://wiki.nixos.org/wiki/GNOME

*/


(lib.optionalAttrs (lib.versionOlder lib.version "25.11") {
  services.xserver.enable = true;
  services.xserver.displayManager.gdm.enable = true;
  services.xserver.displayManager.gdm.wayland = true;
  services.xserver.desktopManager.gnome.enable = true;
})
(lib.optionalAttrs (lib.versionAtLeast lib.version "25.11") {
  services.displayManager.gdm.enable = true;
  services.desktopManager.gnome.enable = true;
})

{
  # services.xserver.enable = true;
  # services.xserver.displayManager.gdm.enable = true;
  # services.xserver.displayManager.gdm.wayland = true;
  # services.xserver.desktopManager.gnome.enable = true;

  #services.printing.enable = true; # CUPS, done in printing.nix
  programs.xwayland.enable = true;
  xdg.portal.enable = true;

  qt.enable = true;
  qt.platformTheme = "gnome";
  qt.style = "adwaita-dark";

  # support GConf-based applications
  # services.dbus.packages = [ pkgs.gnome2.GConf ];

  # Enable system tray icons (used by gnomeExtensions.appindicator)
  services.udev.packages = [ pkgs.gnome-settings-daemon ];

  # programs.dconf.profiles.user.databases = [
  #   {
  #     settings."org/gnome/mutter".experimental-features = [
  #       # "scale-monitor-framebuffer" # Enables fractional scaling (125% 150% 175%)
  #       # "variable-refresh-rate" # Enables Variable Refresh Rate (VRR) on compatible displays
  #       # "xwayland-native-scaling" # Scales Xwayland applications to look crisp on HiDPI screens
  #     ];
  #   }
  # ];

  programs.gnome-terminal.enable = false;

  services.tumbler.enable = true; # TODO: needed when we have ffmpegthumbnailer?
  services.gnome.sushi.enable = true; # quick previewer for nautilus
  # services.gnome.gnome-online-accounts.enable = true; # Gnome SSO service

  # for managing gnome extensions with firefox, assumes programs.firefox.enable
  services.gnome.gnome-browser-connector.enable  = true;

  environment.systemPackages = [
    pkgs.pavucontrol
    pkgs.lxterminal # TODO: remove?
    pkgs.ghostty

    pkgs.gnome-tweaks
    pkgs.refine # Tweak various aspects of GNOME

    # pkgs.thumbler # TODO?
    pkgs.ffmpegthumbnailer
    pkgs.libheif.bin # provides heif-thumbnailer, the program that generates HEIF thumbnails
    pkgs.libheif.out # provides heif.thumbnailer, allows for the viewing of HEIF thumbnails
    pkgs.gnomeExtensions.appindicator

    pkgs.decibels # audio player
    pkgs.dconf-editor

    pkgs.loupe # eog replacement
    pkgs.shotwell # image editor
    # pkgs.gnome-clocks

    pkgs.desktop-file-utils # update-desktop-database
  ];

  # an attempt to make nautilus discover new files, but it proved to be a freebsd-linux incompatiblity
  # inotify is a linux thing, and freebsd instead features kqueue.
  # nfs likely doesn't support such events anyway, predating inotify.
  #kernel.sysctl = {
  #  "fs.inotify.max_user_watches" = "100000";
  #};
  # possible future fix:
  # https://en.wikipedia.org/wiki/File_Alteration_Monitor
  # or https://github.com/fsnotify/fsnotify

  environment.gnome.excludePackages = [
    pkgs.gnome-console
    pkgs.gnome-terminal
    pkgs.gnome-photos
    pkgs.gnome-tour
    pkgs.gnome-maps
    pkgs.gedit # text editor (24.05 vs 23.11)
    # pkgs.papers # Document Viewer (new)
    pkgs.eog
    #pkgs.cheese # webcam tool
    #pkgs.baobab # Disk Usage Analyser
    pkgs.simple-scan # scanning utility
    pkgs.yelp # Help
    pkgs.gnome-music
    pkgs.evince # Document Viewer
    pkgs.epiphany # web browser
    pkgs.geary # email reader
    pkgs.showtime # video player
    pkgs.totem # video player
    pkgs.tali # poker game
    pkgs.iagno # go game
    pkgs.hitori # sudoku game
    pkgs.atomix # puzzle game
  ];
}

]