{ lib, nixosConfig, pkgs, ... }:
let
  cfg = nixosConfig.sbruder.games;
  inherit (nixosConfig.sbruder) unfree;

  steam-sandbox = pkgs.writeShellScriptBin "steam-sandbox" /* bash */ ''
    set -euo pipefail
    shopt -s nullglob # make for loop work for glob if files do not exist
    base_dir="''${XDG_DATA_HOME:-$HOME/.local/share}/steam-sandbox"
    mkdir -p "$base_dir"/{.local/share,.steam,.config,.factorio,data}
    bubblewrap_args=(
        # sandboxing
        --unshare-all
        --share-net
        --die-with-parent
        --new-session

        # basic filesystem
        --tmpfs /tmp
        --proc /proc
        --dev /dev
        --dir "$HOME"
        --dir "$XDG_RUNTIME_DIR"
        --ro-bind /nix/store /nix/store
        # path
        --ro-bind /run/current-system/sw /run/current-system/sw
        --ro-bind /etc/profiles/per-user/$USER/bin /etc/profiles/per-user/$USER/bin
        # system-wide configuration
        --ro-bind /etc/fonts /etc/fonts
        --ro-bind /etc/localtime /etc/localtime
        --ro-bind /etc/machine-id /etc/machine-id
        --ro-bind /etc/os-release /etc/os-release
        --ro-bind /etc/passwd /etc/passwd
        --ro-bind /etc/resolv.conf /etc/resolv.conf
        --ro-bind /etc/ssl/certs /etc/ssl/certs
        --ro-bind /etc/static /etc/static

        # gui
        --ro-bind /tmp/.X11-unix /tmp/.X11-unix
        --ro-bind "$XDG_RUNTIME_DIR/$WAYLAND_DISPLAY" "$XDG_RUNTIME_DIR/$WAYLAND_DISPLAY"
        --dev-bind /dev/dri /dev/dri
        --ro-bind /run/opengl-driver /run/opengl-driver
        --ro-bind-try /run/opengl-driver-32 /run/opengl-driver-32

        # audio
        --ro-bind "$XDG_RUNTIME_DIR/pulse" "$XDG_RUNTIME_DIR/pulse"
        --setenv PULSE_SERVER "$XDG_RUNTIME_DIR/pulse/native"
        --ro-bind "''${XDG_CONFIG_HOME:-$HOME/.config}/pulse/cookie" "''${XDG_CONFIG_HOME:-$HOME/.config}/pulse/cookie"
        --setenv PULSE_COOKIE "''${XDG_CONFIG_HOME:-$HOME/.config}/pulse/cookie/pulse/cookie"
        --ro-bind-try /etc/asound.conf /etc/asound.conf
        --ro-bind-try /etc/alsa/conf.d /etc/alsa/conf.d
        --ro-bind-try "$XDG_RUNTIME_DIR/pipewire-0" "$XDG_RUNTIME_DIR/pipewire-0"

        # dbus
        --ro-bind /run/dbus/system_bus_socket /run/dbus/system_bus_socket
        --ro-bind "$XDG_RUNTIME_DIR/bus" "$XDG_RUNTIME_DIR/bus"

        # shared data
        --bind "$base_dir/.local/share" "$HOME/.local/share"
        --bind "$base_dir/.steam" "$HOME/.steam"
        --bind "$base_dir/.config" "$HOME/.config"
        --bind "$base_dir/.factorio" "$HOME/.factorio"
        --bind "$base_dir/data" "$HOME/data"
        --ro-bind-try "$HOME/.config/MangoHud" "$HOME/.config/MangoHud"

        # input
        --dev-bind /dev/input /dev/input
        --dev-bind-try /dev/uinput /dev/uinput
        --ro-bind /sys /sys # required for discovery
      )

    for hidraw in /dev/hidraw*; do
        bubblewrap_args+=(--dev-bind $hidraw $hidraw)
    done


    unset SDL_VIDEODRIVER QT_QPA_PLATFORM # games generally don’t support wayland
    export PATH="${pkgs.unstable.mangohud}/bin:$PATH"

    ${pkgs.bubblewrap}/bin/bwrap \
        "''${bubblewrap_args[@]}" \
        ''${SANDBOX_COMMAND:-${pkgs.unstable.steam}/bin/steam} \
        "$@"
  '';

  steam-sandbox-with-icons = pkgs.runCommand "steam-sandbox-with-icons" { } ''
    mkdir -p $out/{bin,share}
    ln -s ${pkgs.steamPackages.steam}/share/icons $out/share
    ln -s ${pkgs.steamPackages.steam}/share/pixmaps $out/share
    ln -s ${steam-sandbox}/bin/steam-sandbox $out/bin/steam-sandbox
  '';
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
  ] ++ lib.optionals (cfg.performanceIndex >= 8) [
    unstable.ryujinx
    unstable.yuzu-mainline
  ] ++ lib.optionals unfree.allowSoftware [
    unstable.osu-lazer-sandbox
    steam-sandbox-with-icons
  ];
}