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{ lib
, stdenv
, fetchurl
, cmake
, coreutils
, python
, root
}:

let
  pythonVersion = with lib.versions; "${major python.version}${minor python.version}";
  withPython = python != null;
  # ensure that root is built with the same python interpreter, as it links against numpy
  root_py = if withPython then root.override { inherit python; } else root;
in

stdenv.mkDerivation rec {
  pname = "hepmc3";
  version = "3.2.7";

  src = fetchurl {
    url = "http://hepmc.web.cern.ch/hepmc/releases/HepMC3-${version}.tar.gz";
    sha256 = "sha256-WH+qZVbMVMzYmtNUIUYbR2HXgJvBei5y9QNNrqFCIys=";
  };

  nativeBuildInputs = [
    cmake
  ]
  ++ lib.optional withPython python.pkgs.pythonImportsCheckHook;

  buildInputs = [
    root_py
  ]
  ++ lib.optional withPython python;

  # error: invalid version number in 'MACOSX_DEPLOYMENT_TARGET=11.0'
  preConfigure = lib.optionalString (stdenv.isDarwin && lib.versionAtLeast stdenv.hostPlatform.darwinMinVersion "11") ''
    MACOSX_DEPLOYMENT_TARGET=10.16
  '';

  cmakeFlags = [
    "-DHEPMC3_ENABLE_PYTHON=${if withPython then "ON" else "OFF"}"
  ] ++ lib.optionals withPython [
    "-DHEPMC3_PYTHON_VERSIONS=${if python.isPy3k then "3.X" else "2.X"}"
    "-DHEPMC3_Python_SITEARCH${pythonVersion}=${placeholder "out"}/${python.sitePackages}"
  ];

  postInstall = ''
    substituteInPlace "$out"/bin/HepMC3-config \
      --replace 'greadlink' '${coreutils}/bin/readlink' \
      --replace 'readlink' '${coreutils}/bin/readlink'
  '';

  pythonImportsCheck = [ "pyHepMC3" ];

  meta = with lib; {
    description = "The HepMC package is an object oriented, C++ event record for High Energy Physics Monte Carlo generators and simulation";
    license = licenses.gpl3;
    homepage = "http://hepmc.web.cern.ch/hepmc/";
    platforms = platforms.unix;
    maintainers = with maintainers; [ veprbl ];
  };
}