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

let
  inherit (lib) mkIf;
  inherit (builtins) elem;
  steamFix = pkgs.steam.override {
    extraPkgs = pkgs: with pkgs; [
      xorg.libXcursor
      xorg.libXi
      xorg.libXinerama
      xorg.libXScrnSaver
      libpng
      libpulseaudio
      libvorbis
      stdenv.cc.cc.lib
      libkrb5
      keyutils
      mangohud
      winetricks
      protontricks
      gtk3
      gtk3-x11
    ];
  };
  host = config.systemModules.host;
in

{
  config = mkIf (elem "gaming" host.function) {
    hardware.opengl.extraPackages = [ pkgs.gamescope ];
    services.flatpak.enable = true;
    programs = {
      steam = {
        enable = true;
        package = steamFix;
        extraCompatPackages = [ pkgs.proton-ge-bin.steamcompattool ];
      };
      gamescope = {
        enable = true;
        capSysNice = true;
      };
      gamemode = {
        enable = true;
        settings = {
          general = {
            renice = 15;
            softrealtime = "auto";
          };
           custom = {
            start = "${pkgs.libnotify}/bin/notify-send 'GameMode started'";
            end = "${pkgs.libnotify}/bin/notify-send 'GameMode ended'";
          };
        };
      };
    };
    networking.firewall = {
      allowedTCPPorts = [ 3074 ];
      allowedUDPPorts = [
        88
        500
        3074
        2075
        3544
        4500
      ];
    };
  };
}