import os
import platform
import subprocess
import sys

import xml.etree.ElementTree as ET

import setuptools
from setuptools import Extension, setup
from setuptools.command.build_ext import build_ext


"""
Modified from https://www.benjack.io/2017/06/12/python-cpp-tests.html
"""


class CMakeExtension(Extension):

    def __init__(self, name, sourcedir=''):
        Extension.__init__(self, name, sources=[])
        self.sourcedir = os.path.abspath(sourcedir)


class CMakeBuild(build_ext):

    def run(self):
        try:
            # out =
            subprocess.check_output(['cmake', '--version'])
        except OSError:
            raise RuntimeError(
                'CMake must be installed to build the following extensions: ' +
                ', '.join(e.name for e in self.extensions))

        # if platform.system() == "Windows":
        #     cmake_version = LooseVersion(re.search(r'version\s*([\d.]+)',
        #                                  out.decode()).group(1))
        #     if cmake_version < '3.1.0':
        #         raise RuntimeError("CMake >= 3.1.0 is required on Windows")

        for ext in self.extensions:
            self.build_extension(ext)

    def build_extension(self, ext):
        extdir = os.path.abspath(
            os.path.dirname(self.get_ext_fullpath(ext.name)))

        cmake_args = ['-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=' + extdir,
                      '-DPYTHON_EXECUTABLE=' + sys.executable]

        cfg = 'Debug' if self.debug else 'Release'
        build_args = ['--config', cfg]

        if platform.system() == 'Windows':
            cmake_args += ['-DCMAKE_LIBRARY_OUTPUT_DIRECTORY_{}={}'.format(
                cfg.upper(),
                extdir)]
            if sys.maxsize > 2**32:
                cmake_args += ['-A', 'x64']
            build_args += ['--', '/m']
        else:
            cmake_args += ['-DCMAKE_BUILD_TYPE=' + cfg]
            cmake_args += ['-DBUILD_PYTHON_BINDINGS=ON']
            build_args += ['--', '-j6']

        env = os.environ.copy()
        env['CXXFLAGS'] = '{} -DVERSION_INFO=\\"{}\\"'.format(
            env.get('CXXFLAGS', ''),
            self.distribution.get_version())
        if not os.path.exists(self.build_temp):
            os.makedirs(self.build_temp)
        subprocess.check_call(['cmake', ext.sourcedir] + cmake_args,
                              cwd=self.build_temp, env=env)
        subprocess.check_call(['cmake', '--build', '.'] + build_args,
                              cwd=self.build_temp)


def get_package_xml_version():
    tree = ET.parse('package.xml')
    return tree.find('version').text


with open('README.md', 'r') as f:
    long_description = f.read()

setup(
    name='manifpy',
    version=get_package_xml_version(),
    author='Jeremie Deray',
    author_email='deray.jeremie@gmail.com',
    description='A small library for Lie theory.',
    long_description=long_description,
    long_description_content_type='text/markdown',
    url='https://github.com/artivis/manif',
    license='MIT',
    packages=setuptools.find_packages(),
    classifiers=[
        'Programming Language :: Python :: 3',
        'Operating System :: POSIX :: Linux'
    ],
    ext_modules=[CMakeExtension('manifpy')],
    python_requires='>=3.6',
    cmdclass=dict(build_ext=CMakeBuild),
    zip_safe=False,
    install_requires=['numpy']
)
