default.nix

{
  stdenv,
  resholve,
  writeText,
  fetchFromGitHub,
  python3,
  steamdeck-hw-theme,
  steamPackages,
  bash,
  coreutils,
  dbus,
  findutils,
  galileo-mura,
  gamescope,
  gnugrep,
  gnused,
  gnutar,
  ibus,
  mangohud,
  plasma5Packages,
  powerbuttond,
  procps,
  steam_notif_daemon,
  steamos-polkit-helpers,
  systemd,
  util-linux,
  xbindkeys,
}:

let
  gamescope-session-solution = {
    scripts = [ "bin/gamescope-session" ];
    interpreter = "${bash}/bin/bash";
    inputs = [
      coreutils
      dbus
      findutils
      galileo-mura
      gnugrep
      gnused
      gnutar
      ibus
      mangohud
      plasma5Packages.kconfig
      powerbuttond
      procps
      steam_notif_daemon
      "${steamos-polkit-helpers}/bin/steamos-polkit-helpers"
      steamPackages.steam-fhsenv
      util-linux
      xbindkeys
    ];
    execer = [
      "cannot:${ibus}/bin/ibus-daemon"
      "cannot:${plasma5Packages.kconfig}/bin/kwriteconfig5"
      "cannot:${steamos-polkit-helpers}/bin/steamos-polkit-helpers/steamos-poweroff-now"
      "cannot:${steamos-polkit-helpers}/bin/steamos-polkit-helpers/steamos-reboot-now"
      "cannot:${steamos-polkit-helpers}/bin/steamos-polkit-helpers/steamos-retrigger-automounts"
      "cannot:${steamPackages.steam-fhsenv}/bin/steam"
      "cannot:${util-linux}/bin/flock"
      "cannot:${xbindkeys}/bin/xbindkeys"
    ];
    fake = {
      # we're using wrappers for these
      external = [ "sudo" "gamescope" ];
      source = [
        "/etc/xdg/gamescope-session/environment"
      ];
    };
    fix = {
      "/usr/bin/ibus-daemon" = true;
      "/usr/bin/steamos-polkit-helpers/steamos-poweroff-now" = true;
      "/usr/bin/steamos-polkit-helpers/steamos-reboot-now" = true;
      "/usr/bin/steamos-polkit-helpers/steamos-retrigger-automounts" = true;
      "/usr/lib/hwsupport/powerbuttond" = true;
    };
    keep = {
      # if you've somehow managed to get devkit Steam on your NixOS,
      # everything that happens beyond this point is entirely your fault
      "$HOME/devkit-game/devkit-steam" = true;
      "source:/etc/xdg/gamescope-session/environment" = true;
    };

    prologue = "${writeText "gamescope-session-prologue" ''
      # Don't resholve gamescope so we can use the cap_sys_nice wrapper when available
      export PATH=/run/wrappers/bin:${gamescope}/bin:$PATH
  
      # Make gamescope discover the Steam cursor theme
      export XCURSOR_PATH=${plasma5Packages.breeze-qt5}/share/icons:${steamdeck-hw-theme}/share/icons
    ''}";
  };
  start-gamescope-session-solution = {
    scripts = [ "bin/start-gamescope-session" ];
    interpreter = "${bash}/bin/bash";
    inputs = [ coreutils dbus gnugrep systemd ];
    execer = [
      "cannot:${systemd}/bin/systemctl"
    ];

    # Import user PATH into the environment to be able to start third party tools
    prologue = "${writeText "start-gamescope-session-prologue" ''
      ${systemd}/bin/systemctl --user import-environment PATH
    ''}";
  };
in stdenv.mkDerivation(finalAttrs: {
  pname = "gamescope-session";
  version = "3.14.18-2";

  src = fetchFromGitHub {
    owner = "Jovian-Experiments";
    repo = "PKGBUILDs-mirror";
    rev = "jupiter-main/gamescope-${finalAttrs.version}";
    hash = "sha256-kyNPcThRxfsG53hQErfBtphdQi4K0Oo9m5aE3DeQtas=";
  };

  patches = [
    ./0001-gamescope-session-Add-xdg-environment-overrides.patch
  ];

  postPatch = ''
    patchShebangs steam-http-loader

    substituteInPlace gamescope-session \
      --replace /usr/share ${steamdeck-hw-theme}/share \
      --replace /usr/lib/steam ${steamPackages.steam}/lib/steam

    substituteInPlace gamescope-session.service \
      --replace /usr/bin $out/bin
  '';

  nativeBuildInputs = [python3];

  # Largely copied from upstream
  installPhase = ''
    runHook preInstall

    install -D -m 755 gamescope-session $out/bin/gamescope-session
    install -D -m 755 start-gamescope-session $out/bin/start-gamescope-session
    install -D -m 644 gamescope-wayland.desktop $out/share/wayland-sessions/gamescope-wayland.desktop

    # url handling
    install -D -m 644 steam_http_loader.desktop $out/share/applications/steam_http_loader.desktop
    install -D -m 644 gamescope-mimeapps.list $out/share/applications/gamescope-mimeapps.list
    install -D -m 755 steam-http-loader $out/bin/steam-http-loader

    install -D -m 644 gamescope-session.service $out/share/systemd/user/gamescope-session.service

    # portals
    install -D -m 644 gamescope-portals.conf $out/share/xdg-desktop-portal/gamescope-portals.conf

    ${resholve.phraseSolution "gamescope-session" gamescope-session-solution}
    ${resholve.phraseSolution "start-gamescope-session" start-gamescope-session-solution}

    runHook postInstall
  '';

  passthru.providedSessions = ["gamescope-wayland"];
})