nixos-config/modules/services/gamemode/default.nix

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

let
  cfg = config.ptw.services.gamemode;
in {
  options.ptw.services.gamemode = {
    enable = lib.mkEnableOption "Enable and configure gamemode";
  };

  config = let
    keyboardBrightnessScript = pkgs.writeShellScript "keyboard-brightness.sh" ''
    ${pkgs.rgb_keyboard}/bin/rgb_keyboard -l ripple -b "$1"
    '';
  in lib.mkIf cfg.enable {
    security.sudo.extraConfig = ''
    ${config.ptw.system.singleUser} ALL = (ALL) NOPASSWD: ${keyboardBrightnessScript}
    '';

    programs.gamemode = {
      enable = true;
      enableRenice = true;
      settings = {
        general = {
          reaper_freq = 5;
          desiredgov = "performance";
          igpu_desiredgov = "powersave";
          igpu_power_threshold = 0.3;

          softrealtime = "on";
          renice = 0;
          ioprio = 0;
          inhibit_screensaver = 1;
        };

        gpu = {
          amd_performance_level = "high";
        };

        custom = let
          switchScript = groupName: "${pkgs.dbus}/bin/dbus-send --print-reply --dest=org.fcitx.Fcitx5 /controller org.fcitx.Fcitx.Controller1.SwitchInputMethodGroup string:'${groupName}'";
          pauseFcitx = switchScript "Group 2";
          resumeFcitx = switchScript "Group 1";

          # The scripts
          start = pkgs.writeShellScript "gamemode-start.sh" ''
            # Disable Fcitx's IME
            ${pauseFcitx}

            # Turn on the keyboard lights
            ${config.security.wrapperDir}/sudo ${keyboardBrightnessScript} 1
          '';
          end = pkgs.writeShellScript "gamemode-end.sh" ''
            # Resume Fcitx's IME
            ${resumeFcitx}

            # Turn off the keyboard lights
            ${config.security.wrapperDir}/sudo ${keyboardBrightnessScript} 0
          '';
        in {
          start = "${start}";
          end = "${end}";
        };
      };
    };
  };
}