#!/usr/bin/env python

import glob
import os

import numpy as np
import torch
from setuptools import setup, Extension, find_packages
from torch.utils.cpp_extension import CUDA_HOME
from torch.utils.cpp_extension import CppExtension
from torch.utils.cpp_extension import CUDAExtension
from Cython.Build import cythonize
import platform

def make_cython_ext(name, module, sources):
    extra_compile_args = None
    if platform.system() != 'Windows':
        extra_compile_args = {
            'cxx': ['-Wno-unused-function', '-Wno-write-strings']
        }

    extension = Extension(
        '{}.{}'.format(module, name),
        [os.path.join(*module.split('.'), p) for p in sources],
        include_dirs=[np.get_include()],
        language='c++',
        extra_compile_args=extra_compile_args)
    extension, = cythonize(extension)
    return extension


def make_cuda_ext(name, module, sources):

    return CUDAExtension(
        name='{}.{}'.format(module, name),
        sources=[os.path.join(*module.split('.'), p) for p in sources],
        extra_compile_args={
            'cxx': [],
            'nvcc': [
                '-D__CUDA_NO_HALF_OPERATORS__',
                '-D__CUDA_NO_HALF_CONVERSIONS__',
                '-D__CUDA_NO_HALF2_OPERATORS__',
            ]
        })


def get_extensions():
    this_dir = os.path.dirname(os.path.abspath(__file__))
    extensions_dir = os.path.join(this_dir, "alphaction/csrc")

    main_file = glob.glob(os.path.join(extensions_dir, "*.cpp"))
    source_cpu = glob.glob(os.path.join(extensions_dir, "cpu", "*.cpp"))
    source_cuda = glob.glob(os.path.join(extensions_dir, "cuda", "*.cu"))

    sources = main_file + source_cpu
    extension = CppExtension

    extra_compile_args = {"cxx": []}
    define_macros = []

    if (torch.cuda.is_available() and CUDA_HOME is not None) or os.getenv("FORCE_CUDA", "0") == "1":
        extension = CUDAExtension
        sources += source_cuda
        define_macros += [("WITH_CUDA", None)]
        extra_compile_args["nvcc"] = [
            "-O3",
            "-DCUDA_HAS_FP16=1",
            "-D__CUDA_NO_HALF_OPERATORS__",
            "-D__CUDA_NO_HALF_CONVERSIONS__",
            "-D__CUDA_NO_HALF2_OPERATORS__",
        ]

    sources = [os.path.join(extensions_dir, s) for s in sources]

    include_dirs = [extensions_dir]

    ext_modules = [
        extension(
            "alphaction._custom_cuda_ext",
            sources,
            include_dirs=include_dirs,
            define_macros=define_macros,
            extra_compile_args=extra_compile_args,
        ),
        make_cython_ext(
            name='soft_nms_cpu',
            module='detector.nms',
            sources=['src/soft_nms_cpu.pyx']),
        make_cuda_ext(
            name='nms_cpu',
            module='detector.nms',
            sources=['src/nms_cpu.cpp']),
        make_cuda_ext(
            name='nms_cuda',
            module='detector.nms',
            sources=['src/nms_cuda.cpp', 'src/nms_kernel.cu']),

    ]

    return ext_modules


setup(
    name="alphaction",
    author="yelantf",
    url="https://github.com/MVIG-SJTU/AlphAction",
    ext_modules=get_extensions(),
    packages=find_packages(".", exclude=[
        "config_files", "demo", "gifs", "tools", "data",
    ]),
    install_requires=[
        "tqdm",
        "yacs",
        "opencv-python",
        "tensorboardX",
        "SciPy",
        "matplotlib",
        "cython-bbox",
        "easydict",
    ],
    cmdclass={"build_ext": torch.utils.cpp_extension.BuildExtension},
)