{ lib
, stdenv
, addOpenGLRunpath
, cudaPackages
, buildPythonPackage
, fetchurl
, isPy38
, isPy39
, isPy310
, isPy311
, python
, autoPatchelfHook
, filelock
, lit
, pythonRelaxDepsHook
, zlib
}:

buildPythonPackage rec {
  pname = "triton";
  version = "2.1.0";
  format = "wheel";

  src =
    let pyVerNoDot = lib.replaceStrings [ "." ] [ "" ] python.pythonVersion;
        unsupported = throw "Unsupported system";
        srcs = (import ./binary-hashes.nix version)."${stdenv.system}-${pyVerNoDot}" or unsupported;
    in fetchurl srcs;

  disabled = !(isPy38 || isPy39 || isPy310 || isPy311);

  pythonRemoveDeps = [ "cmake" "torch" ];

  buildInputs = [ zlib ];

  nativeBuildInputs = [
    pythonRelaxDepsHook # torch and triton refer to each other so this hook is included to mitigate that.
    autoPatchelfHook
  ];

  propagatedBuildInputs = [
    filelock
    lit
    zlib
  ];

  dontStrip = true;

  # If this breaks, consider replacing with "${cuda_nvcc}/bin/ptxas"
  postFixup = ''
    chmod +x "$out/${python.sitePackages}/triton/third_party/cuda/bin/ptxas"
  '' +
  (let
    # Bash was getting weird without linting,
    # but basically upstream contains [cc, ..., "-lcuda", ...]
    # and we replace it with [..., "-lcuda", "-L/run/opengl-driver/lib", "-L$stubs", ...]
    old = [ "-lcuda" ];
    new = [ "-lcuda" "-L${addOpenGLRunpath.driverLink}" "-L${cudaPackages.cuda_cudart}/lib/stubs/" ];

    quote = x: ''"${x}"'';
    oldStr = lib.concatMapStringsSep ", " quote old;
    newStr = lib.concatMapStringsSep ", " quote new;
  in
    ''
      substituteInPlace $out/${python.sitePackages}/triton/common/build.py \
        --replace '${oldStr}' '${newStr}'
    '');

  meta = with lib; {
    description = "A language and compiler for custom Deep Learning operations";
    homepage = "https://github.com/openai/triton/";
    changelog = "https://github.com/openai/triton/releases/tag/v${version}";
    # Includes NVIDIA's ptxas, but redistributions of the binary are not limited.
    # https://docs.nvidia.com/cuda/eula/index.html
    # triton's license is MIT.
    # openai-triton-bin includes ptxas binary, therefore unfreeRedistributable is set.
    license = with licenses; [ unfreeRedistributable mit ];
    sourceProvenance = with sourceTypes; [ binaryNativeCode ];
    platforms = [ "x86_64-linux" ];
    maintainers = with maintainers; [ junjihashimoto ];
  };
}