{ lib, stdenv, fetchurl, fetchzip, makeWrapper, runCommand, makeDesktopItem
, xonotic-data, copyDesktopItems
, # required for both
  unzip, libjpeg, zlib, libvorbis, curl, freetype, libpng, libtheora
, # glx
  libX11, libGLU, libGL, libXpm, libXext, libXxf86vm, alsa-lib
, # sdl
  SDL2
, # blind
  gmp

, withSDL ? true
, withGLX ? false
, withDedicated ? true
}:

let
  pname = "xonotic";
  version = "0.8.6";
  name = "${pname}-${version}";
  variant =
    if withSDL && withGLX then
      ""
    else if withSDL then
      "-sdl"
    else if withGLX then
      "-glx"
    else if withDedicated then
      "-dedicated"
    else "-what-even-am-i";

  meta = {
    description = "A free fast-paced first-person shooter";
    longDescription = ''
      Xonotic is a free, fast-paced first-person shooter that works on
      Windows, macOS and Linux. The project is geared towards providing
      addictive arena shooter gameplay which is all spawned and driven
      by the community itself. Xonotic is a direct successor of the
      Nexuiz project with years of development between them, and it
      aims to become the best possible open-source FPS of its kind.
    '';
    homepage = "https://www.xonotic.org/";
    license = lib.licenses.gpl2Plus;
    maintainers = with lib.maintainers; [ astsmtl zalakain ];
    platforms = lib.platforms.linux;
  };

  desktopItem = makeDesktopItem {
    name = "xonotic";
    exec = "xonotic";
    comment = meta.description;
    desktopName = "Xonotic";
    categories = [ "Game" "Shooter" ];
    icon = "xonotic";
    startupNotify = false;
  };

  xonotic-unwrapped = stdenv.mkDerivation rec {
    pname = "xonotic${variant}-unwrapped";
    inherit version;

    src = fetchurl {
      url = "https://dl.xonotic.org/xonotic-${version}-source.zip";
      hash = "sha256-i5KseBz/SuicEhoj6s197AWiqr7azMI6GdGglYtAEqg=";
    };

    nativeBuildInputs = [ unzip ];
    buildInputs = [ libjpeg zlib libvorbis curl gmp ]
      ++ lib.optionals withGLX [ libX11 libGLU libGL libXpm libXext libXxf86vm alsa-lib ]
      ++ lib.optionals withSDL [ SDL2 ];

    sourceRoot = "Xonotic/source/darkplaces";

    # "debug", "release", "profile"
    target = "release";

    dontStrip = target != "release";

    postConfigure = ''
      pushd ../d0_blind_id
      ./configure $configureFlags
      popd
    '';

    buildPhase = (lib.optionalString withDedicated ''
      make -j $NIX_BUILD_CORES sv-${target}
    '' + lib.optionalString withGLX ''
      make -j $NIX_BUILD_CORES cl-${target}
    '' + lib.optionalString withSDL ''
      make -j $NIX_BUILD_CORES sdl-${target}
    '') + ''
      pushd ../d0_blind_id
      make -j $NIX_BUILD_CORES
      popd
    '';

    enableParallelBuilding = true;

    installPhase = (''
      install -Dm644 ../../misc/logos/xonotic_icon.svg \
        $out/share/icons/hicolor/scalable/apps/xonotic.svg
      pushd ../../misc/logos/icons_png
      for img in *.png; do
        size=''${img#xonotic_}
        size=''${size%.png}
        dimensions="''${size}x''${size}"
        install -Dm644 $img \
          $out/share/icons/hicolor/$dimensions/apps/xonotic.png
      done
      popd
    '' + lib.optionalString withDedicated ''
      install -Dm755 darkplaces-dedicated "$out/bin/xonotic-dedicated"
    '' + lib.optionalString withGLX ''
      install -Dm755 darkplaces-glx "$out/bin/xonotic-glx"
    '' + lib.optionalString withSDL ''
      install -Dm755 darkplaces-sdl "$out/bin/xonotic-sdl"
    '') + ''
      pushd ../d0_blind_id
      make install
      popd
    '';

    # Xonotic needs to find libcurl.so at runtime for map downloads
    dontPatchELF = true;
    postFixup = lib.optionalString withDedicated ''
      patchelf --add-needed ${curl.out}/lib/libcurl.so $out/bin/xonotic-dedicated
    '' + lib.optionalString withGLX ''
      patchelf \
          --add-needed ${curl.out}/lib/libcurl.so \
          --add-needed ${libvorbis}/lib/libvorbisfile.so \
          --add-needed ${libvorbis}/lib/libvorbisenc.so \
          --add-needed ${libvorbis}/lib/libvorbis.so \
          --add-needed ${libGL.out}/lib/libGL.so \
          --add-needed ${freetype}/lib/libfreetype.so \
          --add-needed ${libpng}/lib/libpng.so \
          --add-needed ${libtheora}/lib/libtheora.so \
          $out/bin/xonotic-glx
    '' + lib.optionalString withSDL ''
      patchelf \
          --add-needed ${curl.out}/lib/libcurl.so \
          --add-needed ${libvorbis}/lib/libvorbisfile.so \
          --add-needed ${libvorbis}/lib/libvorbisenc.so \
          --add-needed ${libvorbis}/lib/libvorbis.so \
          --add-needed ${freetype}/lib/libfreetype.so \
          --add-needed ${libpng}/lib/libpng.so \
          --add-needed ${libtheora}/lib/libtheora.so \
          $out/bin/xonotic-sdl
    '';
  };

in rec {
  xonotic-data = fetchzip {
    name = "xonotic-data";
    url = "https://dl.xonotic.org/xonotic-${version}.zip";
    hash = "sha256-Lhjpyk7idmfQAVn4YUb7diGyyKZQBfwNXxk2zMOqiZQ=";
    postFetch = ''
      cd $out
      rm -rf $(ls | grep -v "^data$" | grep -v "^key_0.d0pk$")
    '';
    meta.hydraPlatforms = [];
    passthru.version = version;
  };

  xonotic = runCommand "xonotic${variant}-${version}" {
    inherit xonotic-unwrapped;
    nativeBuildInputs = [ makeWrapper copyDesktopItems ];
    desktopItems = [ desktopItem ];
    passthru = {
      inherit version;
      meta = meta // {
        hydraPlatforms = [];
      };
    };
  } (''
    mkdir -p $out/bin
  '' + lib.optionalString withDedicated ''
    ln -s ${xonotic-unwrapped}/bin/xonotic-dedicated $out/bin/
  '' + lib.optionalString withGLX ''
    ln -s ${xonotic-unwrapped}/bin/xonotic-glx $out/bin/xonotic-glx
    ln -s $out/bin/xonotic-glx $out/bin/xonotic
  '' + lib.optionalString withSDL ''
    ln -s ${xonotic-unwrapped}/bin/xonotic-sdl $out/bin/xonotic-sdl
    ln -sf $out/bin/xonotic-sdl $out/bin/xonotic
  '' + lib.optionalString (withSDL || withGLX) ''
    mkdir -p $out/share
    ln -s ${xonotic-unwrapped}/share/icons $out/share/icons
    copyDesktopItems
  '' + ''
    for binary in $out/bin/xonotic-*; do
      wrapProgram $binary --add-flags "-basedir ${xonotic-data}" --prefix LD_LIBRARY_PATH : "${xonotic-unwrapped}/lib"
    done
  '');
}
