# coding=utf-8

# SPDX-FileCopyrightText: Copyright (c) 2022 The torch-harmonics Authors. All rights reserved.
# SPDX-License-Identifier: BSD-3-Clause
#
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import sys

try:
    from setuptools import setup, find_packages
except ImportError:
    from distutils.core import setup, find_packages

import re
from pathlib import Path

import torch
from torch.utils import cpp_extension

def version(root_path):
    """Returns the version taken from __init__.py

    Parameters
    ----------
    root_path : pathlib.Path
        path to the root of the package

    Reference
    ---------
    https://packaging.python.org/guides/single-sourcing-package-version/
    """
    version_path = root_path.joinpath("torch_harmonics", "__init__.py")
    with version_path.open() as f:
        version_file = f.read()
    version_match = re.search(r"^__version__ = ['\"]([^'\"]*)['\"]", version_file, re.M)
    if version_match:
        return version_match.group(1)
    raise RuntimeError("Unable to find version string.")


def readme(root_path):
    """Returns the text content of the README.md of the package

    Parameters
    ----------
    root_path : pathlib.Path
        path to the root of the package
    """
    with root_path.joinpath("README.md").open(encoding="UTF-8") as f:
        return f.read()


def get_ext_modules(argv):

    compile_cuda_extension = False

    if "--cuda_ext" in sys.argv:
        sys.argv.remove("--cuda_ext")
        compile_cuda_extension = True

    ext_modules = [
        cpp_extension.CppExtension("disco_helpers", ["torch_harmonics/csrc/disco/disco_helpers.cpp"]),
    ]

    if torch.cuda.is_available() or compile_cuda_extension:
        ext_modules.append(
            cpp_extension.CUDAExtension(
                "disco_cuda_extension",
                [
                    "torch_harmonics/csrc/disco/disco_interface.cu",
                    "torch_harmonics/csrc/disco/disco_cuda_fwd.cu",
                    "torch_harmonics/csrc/disco/disco_cuda_bwd.cu",
                ],
            )
        )

    return ext_modules


root_path = Path(__file__).parent
README = readme(root_path)
VERSION = version(root_path)

# external modules
ext_modules = get_ext_modules(sys.argv)

config = {
    "name": "torch_harmonics",
    "packages": find_packages(),
    "description": "A differentiable spherical harmonic transform for PyTorch.",
    "long_description": README,
    "long_description_content_type": "text/markdown",
    "url": "https://github.com/NVIDIA/torch-harmonics",
    "author": "Boris Bonev",
    "author_email": "bbonev@nvidia.com",
    "version": VERSION,
    "install_requires": ["torch", "numpy"],
    "extras_require": {
        "sfno": ["tensorly", "tensorly-torch"],
    },
    "license": "Modified BSD",
    "scripts": [],
    "include_package_data": True,
    "classifiers": ["Topic :: Scientific/Engineering", "License :: OSI Approved :: BSD License", "Programming Language :: Python :: 3"],
    "ext_modules": ext_modules,
    "cmdclass": {"build_ext": cpp_extension.BuildExtension} if ext_modules else {},
}

setup(**config)
