import glob
import os
import re
from setuptools import find_packages, setup
from torch.utils.cpp_extension import CUDAExtension, BuildExtension


def parse_requirements(fname='requirements.txt', with_version=True):
    """Parse the package dependencies listed in a requirements file but strips
    specific versioning information.
    Args:
        fname (str): path to requirements file
        with_version (bool, default=False): if True include version specs
    Returns:
        List[str]: list of requirements items
    CommandLine:
        python -c "import setup; print(setup.parse_requirements())"
    """
    import sys
    from os.path import exists
    require_fpath = fname

    def parse_line(line):
        """Parse information from a line in a requirements text file."""
        if line.startswith('-r '):
            # Allow specifying requirements in other files
            target = line.split(' ')[1]
            for info in parse_require_file(target):
                yield info
        else:
            info = {'line': line}
            if line.startswith('-e '):
                info['package'] = line.split('#egg=')[1]
            else:
                # Remove versioning from the package
                pat = '(' + '|'.join(['>=', '==', '>']) + ')'
                parts = re.split(pat, line, maxsplit=1)
                parts = [p.strip() for p in parts]

                info['package'] = parts[0]
                if len(parts) > 1:
                    op, rest = parts[1:]
                    if ';' in rest:
                        # Handle platform specific dependencies
                        # http://setuptools.readthedocs.io/en/latest/setuptools.html#declaring-platform-specific-dependencies
                        version, platform_deps = map(str.strip,
                                                     rest.split(';'))
                        info['platform_deps'] = platform_deps
                    else:
                        version = rest  # NOQA
                    info['version'] = (op, version)
            yield info

    def parse_require_file(fpath):
        with open(fpath, 'r') as f:
            for line in f.readlines():
                line = line.strip()
                if line and not line.startswith('#'):
                    for info in parse_line(line):
                        yield info

    def gen_packages_items():
        if exists(require_fpath):
            for info in parse_require_file(require_fpath):
                parts = [info['package']]
                if with_version and 'version' in info:
                    parts.extend(info['version'])
                if not sys.version.startswith('3.4'):
                    # apparently package_deps are broken in 3.4
                    platform_deps = info.get('platform_deps')
                    if platform_deps is not None:
                        parts.append(';' + platform_deps)
                item = ''.join(parts)
                yield item

    packages = list(gen_packages_items())
    return packages


install_requires = parse_requirements()


def get_extensions():
    extensions = []

    op_files = glob.glob('./lanedet/ops/csrc/*.c*')
    extension = CUDAExtension
    ext_name = 'lanedet.ops.nms_impl'

    ext_ops = extension(
        name=ext_name,
        sources=op_files,
    )

    extensions.append(ext_ops)

    return extensions


setup(
    name='lanedet',
    version="1.0",
    description='Lane Detection open toolbox via Pytorch',
    keywords='computer vision & lane detection',
    classifiers=['License :: OSI Approved :: MIT License',
                 'Programming Language :: Python :: 3',
                 'Intended Audience :: Developers',
                 'Operating System :: OS Independent'],
    packages=find_packages(),
    include_package_data=True,
    url='https://github.com//turoad/lanedet',
    author='Tu Zheng',
    author_email='zhengtuzju@gmail.com',
    setup_requires=['pytest-runner'],
    tests_require=['pytest'],
    install_requires=install_requires,
    ext_modules=get_extensions(),
    cmdclass={'build_ext': BuildExtension},
    zip_safe=False)
