{ lib
, stdenv
, fetchurl
, writeShellApplication
, fetchFromGitHub
, cjson
, cmake
, git
, makeWrapper
, unzip
, curl
, freetype
, glew
, libjpeg
, libogg
, libpng
, libtheora
, lua5_4
, minizip
, openal
, SDL2
, sqlite
, zlib
}:
let
  version = "2.82.0";

  fetchAsset = { asset, hash }: fetchurl {
    url = "https://mirror.etlegacy.com/etmain/${asset}";
    inherit hash;
  };

  pak0 = fetchAsset {
    asset = "pak0.pk3";
    hash = "sha256-cSlmsg4GUj/oFBlRZQDkmchrK0/sgjhW3b0zP8s9JuU=";
  };

  pak1 = fetchAsset {
    asset = "pak1.pk3";
    hash = "sha256-VhD9dJAkQFtEJafOY5flgYe5QdIgku8R1IRLQn31Pl0=";
  };

  pak2 = fetchAsset {
    asset = "pak2.pk3";
    hash = "sha256-pIq3SaGhKrTZE3KGsfI9ZCwp2lmEWyuvyPZOBSzwbz4=";
  };

  fakeGit = writeShellApplication {
    name = "git";

    text = ''
      if [ "$1" = "describe" ]; then
        echo "${version}"
      fi
    '';
  };
in
stdenv.mkDerivation {
  pname = "etlegacy";
  inherit version;

  src = fetchFromGitHub {
    owner = "etlegacy";
    repo = "etlegacy";
    rev = "refs/tags/v${version}";
    hash = "sha256-yNVVEa+3+Swm3hgwm9cSLV0K88E37TgVVjh1uUl8O2o=";
  };

  nativeBuildInputs = [
    cjson
    cmake
    fakeGit
    git
    makeWrapper
    unzip
  ];

  buildInputs = [
    curl
    freetype
    glew
    libjpeg
    libogg
    libpng
    libtheora
    lua5_4
    minizip
    openal
    SDL2
    sqlite
    zlib
  ];

  preBuild = ''
    # Required for build time to not be in 1980
    export SOURCE_DATE_EPOCH=$(date +%s)
    # This indicates the build was by a CI pipeline and prevents the resource
    # files from being flagged as 'dirty' due to potentially being custom built.
    export CI="true"
  '';

  cmakeFlags = [
    "-DCROSS_COMPILE32=0"
    "-DBUILD_SERVER=1"
    "-DBUILD_CLIENT=1"
    "-DBUNDLED_JPEG=0"
    "-DBUNDLED_LIBS=0"
    "-DINSTALL_EXTRA=0"
    "-DINSTALL_OMNIBOT=0"
    "-DINSTALL_GEOIP=0"
    "-DINSTALL_WOLFADMIN=0"
    "-DFEATURE_AUTOUPDATE=0"
    "-DINSTALL_DEFAULT_BASEDIR=${placeholder "out"}/lib/etlegacy"
    "-DINSTALL_DEFAULT_BINDIR=${placeholder "out"}/bin"
  ];

  postInstall = ''
    ln -s ${pak0} $out/lib/etlegacy/etmain/pak0.pk3
    ln -s ${pak1} $out/lib/etlegacy/etmain/pak1.pk3
    ln -s ${pak2} $out/lib/etlegacy/etmain/pak2.pk3

    makeWrapper $out/bin/etl.* $out/bin/etl
    makeWrapper $out/bin/etlded.* $out/bin/etlded
  '';

  hardeningDisable = [ "fortify" ];

  meta = {
    description = "ET: Legacy is an open source project based on the code of Wolfenstein: Enemy Territory which was released in 2010 under the terms of the GPLv3 license";
    homepage = "https://etlegacy.com";
    license = with lib.licenses; [ gpl3 cc-by-nc-sa-30 ];
    longDescription = ''
      ET: Legacy, an open source project fully compatible client and server
      for the popular online FPS game Wolfenstein: Enemy Territory - whose
      gameplay is still considered unmatched by many, despite its great age.
    '';
    mainProgram = "etl";
    maintainers = with lib.maintainers; [ ashleyghooper drupol ];
    platforms = lib.platforms.linux;
  };
}