{ pkgs, inputs, ... }:

let
  pkgs_unstable = inputs.nixpkgs-unstable.legacyPackages."${pkgs.stdenv.hostPlatform.system}";

  # https://simpler-website.pages.dev/html/2021/1/wine-environment-variables/#wineesync
  wine-wrapped = (pkgs.writeShellApplication {
    name = "wine";
    runtimeInputs = [ pkgs_unstable.wineWowPackages.stagingFull ];
    text = ''
      export WINEPREFIX="''${WINEPREFIX:-"$HOME/Games/wine/default"}"
      wine "$@"
    '';
  });

  # https://github.com/GloriousEggroll/proton-ge-custom?tab=readme-ov-file#modification
  # These aren't yet documented in the README:
  # PROTON_MEDIA_USE_GST=1 will tell proton to use the winegstreamer backend instead of the default winedmo backend (the winedmo backend was introduced in Proton 10 and is the current preferred video playback method). This can be useful for games with videos that may have worked in Proton 9 but regressed in Proton 10.
  # PROTON_GST_VIDEO_ORIENTATION=<orientation> can be any of the following: vertical-flip, horizontal-flip, rotate-180, automatic. This is useful if some games have videos that are upside down or otherwise not oriented correctly.
  umu-wrapped = (pkgs.writeShellApplication {
    name = "umu-run";
    runtimeInputs = [ pkgs_unstable.umu-launcher ];
    text = ''
      export PROTONPATH="''${PROTONPATH:-"GE-Proton"}"
      export PROTON_ENABLE_WAYLAND="''${PROTON_ENABLE_WAYLAND:-"0"}"
      umu-run "$@"
    '';
  });

  # proton with ja_JP
  umu-ja = (pkgs.writeShellApplication {
    name = "umu-ja";
    runtimeInputs = [ umu-wrapped ];
    text = "LANG=ja_JP.utf8 umu-run \"$@\"";
  });

  # wine with ja_JP
  wine-ja = (pkgs.writeShellApplication {
    name = "wine-ja";
    runtimeInputs = [ wine-wrapped ];
    text = "LANG=ja_JP.utf8 wine \"$@\"";
  });
in
{
  home.packages = with pkgs;[
    # Wine / Proton    
    umu-wrapped
    umu-ja
    wine-wrapped
    wine-ja
    pkgs_unstable.winetricks
    bottles
    (heroic.override {
      extraPkgs = pkgs: [
        pkgs.umu-launcher
        pkgs.gamescope
        pkgs.mangohud
      ];
    })

    # Steam
    steamguard-cli

    # Emulators    
    pkgs_unstable.ryubing
    mgba

    # Cheat engine
    scanmem
  ];

  programs = {
    mangohud = {
      enable = true;
      enableSessionWide = true;
      settings = {
        preset = 1;
      };
      settingsPerApplication = {
        mpv = {
          no_display = true;
        };
      };
    };
  };
}