{ stdenv
, lib
, fetchFromBitbucket
, cmake
, pkg-config
, makeWrapper
, zlib
, bzip2
, libjpeg
, SDL2
, SDL2_net
, SDL2_mixer
, gtk3
, writers
, python3Packages
, nix-update
}:

stdenv.mkDerivation rec {
  pname = "ecwolf";
  version = "1.4.1";

  src = fetchFromBitbucket {
    owner = pname;
    repo = pname;
    rev = version;
    sha256 = "V2pSP8i20zB50WtUMujzij+ISSupdQQ/oCYYrOaTU1g=";
  };

  nativeBuildInputs = [ cmake pkg-config ]
    ++ lib.optionals stdenv.hostPlatform.isDarwin [ makeWrapper ];
  buildInputs = [ zlib bzip2 libjpeg SDL2 SDL2_net SDL2_mixer gtk3 ];

  NIX_LDFLAGS = lib.optionalString stdenv.hostPlatform.isDarwin "-framework AppKit";

  # ECWolf installs its binary to the games/ directory, but Nix only adds bin/
  # directories to the PATH.
  postInstall = lib.optionalString stdenv.hostPlatform.isLinux ''
    mv "$out/games" "$out/bin"
  '' + lib.optionalString stdenv.hostPlatform.isDarwin ''
    mkdir -p $out/{Applications,bin}
    cp -R ecwolf.app $out/Applications
    makeWrapper $out/{Applications/ecwolf.app/Contents/MacOS,bin}/ecwolf
  '';

  passthru.updateScript = let
    updateScriptPkg = writers.writePython3 "ecwolf_update_script" {
      libraries = with python3Packages; [ debian-inspector requests ];
    } ''
      from os import execl
      from sys import argv

      from debian_inspector.debcon import get_paragraphs_data
      from requests import get

      # The debian.drdteam.org repo is a primary source of information. It’s
      # run by Blzut3, the creator and primary developer of ECWolf. It’s also
      # listed on ECWolf’s download page:
      # <https://maniacsvault.net/ecwolf/download.php>.
      url = 'https://debian.drdteam.org/dists/stable/multiverse/binary-amd64/Packages'  # noqa: E501
      response = get(url)
      packages = get_paragraphs_data(response.text)
      for package in packages:
          if package['package'] == 'ecwolf':
              latest_version = package['version']
              break
      nix_update_path = argv[1]

      execl(nix_update_path, nix_update_path, '--version', latest_version)
    '';
  in [ updateScriptPkg (lib.getExe nix-update) ];

  meta = with lib; {
    description = "Enhanched SDL-based port of Wolfenstein 3D for various platforms";
    mainProgram = "ecwolf";
    homepage = "https://maniacsvault.net/ecwolf/";
    license = licenses.gpl2Plus;
    maintainers = with maintainers; [ jayman2000 sander ];
    platforms = platforms.all;
  };
}