# SPDX-FileCopyrightText: 2021-2024 Simon Bruder <simon@sbruder.de>
#
# SPDX-License-Identifier: AGPL-3.0-or-later
#
# Steam is installed as a flatpak,
# as this seems to be the only method that does not force me
# to spend hours debugging various issues with the client.
#
# Installation instructions for steam:
#
# 1. Run flatpak install flathub com.valvesoftware.Steam
# 2. Use Flatseal to revoke all filesystem permissions,
#    development syscalls
#    and bluetooth.
# 3. Add GDK_SCALE=2 as an environment variable (hack for sway’s Xwayland)
# 4. If you previously used steam-sandbox,
#    you need to copy the files to the flatpak location.
#    For this, start steam once (you can close it early),
#    so it creates the new structure.
#    Then, run the following commands:
#        rm -rf ~/.var/app/com.valvesoftware.Steam/.local/share/Steam
#        mv ~/.local/share/steam-sandbox/.local/share/Steam ~/.var/app/com.valvesoftware.Steam/.local/share/
#    You might want to copy additional files of games,
#    that do not store files inside of Steam’s directories.
#    Afterwards, you can delete ~/.local/share/steam-sandbox
#
# For MangoHud, the following steps are also necessary:
# 1. Run flatpak install org.freedesktop.Platform.VulkanLayer.MangoHud
# 2. Add xdg-config/MangoHud:ro as filesystem mount to Steam in Flatseal
# 4. For Intel Arc systems,
#    add /run/wrappers/bin/intel_gpu_top:ro as filiesystem mount
#    and /run/wrappers/bin to the PATH environment variable in Flatseal
# 3. Add MANGOHUD=1 as a launch options to all games where MangoHud should be
#    available
{ lib, nixosConfig, pkgs, ... }:
let
  cfg = nixosConfig.sbruder.games;
  inherit (nixosConfig.sbruder) unfree;
in
lib.mkIf cfg.enable {
  home.packages = with pkgs; [
    unstable.mangohud
  ] ++ lib.optionals (cfg.performanceIndex >= 2) [
    mgba
  ] ++ lib.optionals (cfg.performanceIndex >= 4) [
    desmume
    unstable.dolphin-emu-beta
    pcsx2
  ] ++ lib.optionals (cfg.performanceIndex >= 8) [
    unstable.ryujinx
  ] ++ lib.optionals unfree.allowSoftware [
    unstable.osu-lazer-sandbox
  ];
}