nixos-config/modules/nixos/_private/suites/desktop.nix

# This is where extra desktop goodies can be found.
# As a note, this is not where you set the aesthetics of your graphical sessions.
# That can be found in the `themes` module.
{ config, lib, pkgs, options, ... }:

let cfg = config.suites.desktop;
in {
  options.suites.desktop = {
    enable =
      lib.mkEnableOption "basic desktop-related services and default programs";
    cleanup.enable = lib.mkEnableOption "activation of various cleanup services";
    autoUpgrade.enable = lib.mkEnableOption "auto-upgrade service with this system";
  };

  config = lib.mkIf cfg.enable (lib.mkMerge [
    ({
      # Enable Flatpak for additional options for installing desktop applications.
      services.flatpak.enable = true;
      xdg.portal.enable = true;

      environment.etc =
        let
          urls = {
            "flathub" = {
              url = "https://flathub.org/repo/flathub.flatpakrepo";
              hash = "sha256-M3HdJQ5h2eFjNjAHP+/aFTzUQm9y9K+gwzc64uj+oDo=";
            };
            "flathub-beta" = {
              url = "https://flathub.org/beta-repo/flathub-beta.flatpakrepo";
              hash = "sha256-WCyuPJ+dRjnwJ976/m+jO9oKOk1EEpDZJq2For4PcgY=";
            };
            "gnome-nightly" = {
              url = "https://nightly.gnome.org/gnome-nightly.flatpakrepo";
              hash = "sha256-rFluVpCvgs1iy7YKVnkPh3p6YuF4orbVuOhLUUFRyYM=";
            };
            "kdeapps" = {
              url = "https://distribute.kde.org/kdeapps.flatpakrepo";
              hash = "sha256-dCF9QQYMmqMuzwAS+HYoPAAtwfzO7aVCl8s4RwhneqI=";
            };
          };
        in
        lib.mapAttrs'
          (name: remote:
            lib.nameValuePair
              "flatpak/remotes.d/${name}.flatpakrepo"
              { source = pkgs.fetchurl remote; })
          urls;

      programs.extra-container.enable = true;

      # Enable font-related options for more smoother and consistent experience.
      fonts.fontconfig.enable = true;

      # Run unpatched binaries with these!
      programs.nix-ld = {
        enable = true;
        libraries =
          let
            xorgLibs = with pkgs.xorg; [
              libX11
              libXScrnSaver
              libXcomposite
              libXcursor
              libXdamage
              libXext
              libXfixes
              libXi
              libXrandr
              libXrender
              libXtst
              libxcb
              libxkbfile
              libxshmfence
            ];
            commonLibs = with pkgs; [
              alsa-lib
              cairo
              freetype
              dbus
              icu
              libGL
              libnotify
              mesa
              nss
              pango
              pipewire
            ];
          in
          commonLibs ++ xorgLibs ++ options.programs.nix-ld.libraries.default;
      };

      environment.systemPackages = with pkgs; [
        steam-run # For the heathens that still uses FHS.
      ];

      # Enable running GNOME apps outside GNOME.
      programs.dconf.enable = true;

      # Enable virtual camera.
      boot.kernelModules = [ "v4l2loopback" ];
    })

    (lib.mkIf cfg.cleanup.enable {
      # Weekly garbage collection of Nix store.
      nix.gc = {
        automatic = true;
        persistent = true;
        dates = "weekly";
        options = "--delete-older-than 7d";
      };

      # Run the optimizer.
      nix.optimise = {
        automatic = true;
        dates = [ "weekly" ];
      };

      # Journal settings for retention.
      services.journald.extraConfig = ''
        MaxRetentionSec="3 month"
      '';
    })

    (lib.mkIf cfg.autoUpgrade.enable {
      system.autoUpgrade = {
        enable = true;
        flake = "github:foo-dogsquared/nixos-config";
        allowReboot = true;
        persistent = true;
        rebootWindow = {
          lower = "22:00";
          upper = "00:00";
        };
        dates = "weekly";
        flags = [
          "--update-input"
          "nixpkgs"
          "--commit-lock-file"
          "--no-write-lock-file"
        ];
        randomizedDelaySec = "1min";
      };
    })
  ]);
}