{ inputs, config, lib, pkgs, namespace, ... }:
let
  inherit (lib) mkIf mkEnableOption;

  cfg = config.${namespace}.application.steam;
in
{
  options.${namespace}.application.steam = {
    enable = mkEnableOption "enable steam";
  };

  config = mkIf cfg.enable {
    home.packages = with pkgs; [ protonup ];

    home.sessionVariables = {
      STEAM_EXTRA_COMPAT_TOOLS_PATHS = "\${HOME}/.steam/root/compatibilitytools.d";
    };

    programs = {
      steam = {
        enable = true;
        package = pkgs.steam-small.override {
          extraEnv = {
            DXVK_HUD = "compiler";
            MANGOHUD = true;
          };
        };

        gamescopeSession = {
          enable = true;
          args = ["--immediate-flips"];
        };
      };

      # https://github.com/FeralInteractive/gamemode
      gamemode = {
        enable = true;
        enableRenice = true;
        settings = {};
      };

      gamescope = {
        enable = true;
        capSysNice = true;
        env = {
          DXVK_HDR = "1";
          ENABLE_GAMESCOPE_WSI = "1";
          WINE_FULLSCREEN_FSR = "1";
          WLR_RENDERER = "vulkan";
        };
        args = ["--hdr-enabled"];
      };
    };
  };
}