{ pkgs, lib, config, jovian, ... }: {
  imports = [
    jovian.nixosModules.jovian
  ];

  jovian = {
    hardware.has.amd.gpu = true;
    steamos.useSteamOSConfig = true;
    steamos.enableDefaultCmdlineConfig = false;

    steam = {
      enable = true;
      autoStart = true;
      desktopSession = "plasma";
      user = "app";
    };
  };

  users.home.persistApp.directories = [
    ".steam" ".local/share/Steam"
    ".config/gamescope" ".config/hhd"
    ".kodi"
  ];

  users.users.app.extraGroups = [ "networkmanager" "gamemode" ];
  programs.gamemode.enable = true;
  programs.regreet.enable = false;
  home.plasma.enable = true;
  home.plasma.extraConfig = {
    configFile = {
      kwinrc.Xwayland.Scale = 1.75;
      kscreenlockerrc.Daemon.Autolock = false;
    };
  };

  home-manager.users.app.home.packages = with pkgs; [
    (pkgs.kodi-wayland.passthru.withPackages (kodiPkgs: with kodiPkgs; [
      joystick # keymap steam-controller
      #controller-topology-project
      libretro libretro-2048
      libretro-fuse libretro-genplus libretro-mgba
      libretro-nestopia libretro-snes9x
      jellycon
    ]))
  ];

  services.handheld-daemon = {
    enable = true;
    user = "app";
  };

  jovian.decky-loader = let
    adjustor = pkgs.python3.pkgs.buildPythonApplication rec {
      pname = "adjustor";
      version = "2.1.5";
      pyproject = true;

      src = pkgs.fetchFromGitHub {
        owner = "hhd-dev";
        repo = pname;
        rev = "v${version}";
        hash = "sha256-KgeK2lC3b9VbjYmy7rD/ImODWDDx3pWIzWgNnSLJeDs=";
      };

      propagatedBuildInputs = with pkgs.python3.pkgs; [
        setuptools
        pyroute2
        rich
      ];

      # This package doesn't have upstream tests.
      doCheck = false;
    };
  in {
    # ~/.steam/steam/.cef-enable-remote-debugging
    enable = true;
    user = "app";
    extraPackages = with pkgs; [
      curl unzip util-linux gnugrep procps pciutils kmod
      ryzenadj # adjustor
    ];
    extraPythonPackages = pythonPackages: with pythonPackages; [
      hid pyyaml
      # adjustor
    ];
    stateDir = "/nix/persist/decky";
  };

  boot.kernelParams = lib.mkIf config.jovian.decky-loader.enable [ "iomem=relaxed" "amd_pstate=passive" ];
}