#! /usr/bin/env python3

import os
import re
import sys
import platform
import subprocess

from distutils.version import LooseVersion
from setuptools import setup, Extension, find_packages
from setuptools.command.build_ext import build_ext


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]
            build_args += ['--', '-j2']

        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)
        print()  # Add an empty line for cleaner output


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


setup(
    name='homlib',
    version='0.0.0a1',
    packages=find_packages('src'),
    package_dir={'': 'src'},
    ext_modules=[CMakeExtension('homlib')],
    cmdclass=dict(build_ext=CMakeBuild),
    test_suite='tests',
    zip_safe=False,
    license='MIT',
    author='Marcus Valtonen Ornhag',
    author_email='marcusvaltonen@gmail.com',
    url='https://github.com/marcusvaltonen/python-homlib',
    description='A Python package including a variety of homography solvers',
    long_description=long_description,
    long_description_content_type='text/markdown',
    classifiers=[
        'Development Status :: 1 - Planning',
        'License :: OSI Approved :: MIT License',
        'Intended Audience :: Developers',
        'Intended Audience :: Science/Research',
        'Programming Language :: Python :: 3',
        'Programming Language :: Python :: 3.7',
        'Programming Language :: Python :: 3.8',
        'Operating System :: POSIX :: Linux',
        'Topic :: Scientific/Engineering',
        'Topic :: Scientific/Engineering :: Image Processing',
    ],
    keywords='computer vision homography',
    install_requires=[
        'numpy>=1.19',
        'pybind11>=2.2',
    ],
    python_requires='>=3',
    extras_require={
        'dev': [
            'pytest>=3.7',
            'numpy>=1.19',
            'flake8==3.8.4',
        ],
    },
)
