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

{
  options = {
    steamos = {
      amdvlk = lib.mkOption {
        type = lib.types.bool;
        default = false;
      };
      displayName = lib.mkOption {
        type = lib.types.str;
        default = "DP-1";
      };
    };
  };

  config = {
    users.users.steam = {
      isNormalUser = true;
      uid = 1010;
      password = "steam";
      extraGroups = [
        "video"
        "input"
        "audio"
        "networkmanager"
      ];
      shell = pkgs.bash;
    };

    services.xserver.enable = false;

    hardware = {
      graphics = {
        enable = true;
        enable32Bit = true;
      };

      amdgpu.amdvlk = lib.mkIf config.steamos.amdvlk {
        enable = true;
        support32Bit.enable = true;
      };
    };

    programs = {
      gamescope = {
        enable = true;
        capSysNice = true;
      };
      steam = {
        enable = true;
        gamescopeSession.enable = true;

        remotePlay.openFirewall = true;
        dedicatedServer.openFirewall = true;
        localNetworkGameTransfers.openFirewall = true;
      };
    };

    services.getty.autologinUser = "steam";
    environment = {
      loginShellInit = ''
        [[ "$(tty)" = "/dev/tty1" ]] && ./gs.sh
      '';
    };

    home-manager.users.steam = {
      home.file."gs.sh" = {
        text = ''
          #!/usr/bin/env bash

          set -xeuo pipefail

          gamescopeArgs=(
              --adaptive-sync # VRR support
              --hdr-enabled
              --rt
              --steam
              -S ${config.steamos.displayName}
          )
          steamArgs=(
              -pipewire-dmabuf
              -tenfoot
              --console
          )

          exec gamescope "$${gamescopeArgs[@]}" -- steam "$${steamArgs[@]}"
        '';
        executable = true;
      };
    };
  };
}