import os
import re
import sys
import platform
import subprocess
import shutil
from setuptools import setup, Extension
from setuptools.command.build_ext import build_ext
from distutils.version import LooseVersion


class CMakeExtension(Extension):
    def __init__(self, name, sourcedir=''):
        Extension.__init__(self, name, sources=[])
        self.sourcedir = os.path.abspath(sourcedir)+"/src/python/svarpy"


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,'-DPIPING=ON']

        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)
        print('cmake', ext.sourcedir, cmake_args)
        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)
        if platform.system() == "Windows":
            build_tmp_abs_path = os.path.join(os.path.abspath(self.build_temp),"Release")
            for root, dirs, files in os.walk(build_tmp_abs_path):
                for file in files:
                    src_file = os.path.join(root, file)
                    shutil.copy(src_file, extdir)

setup(
    name='svar',
    version='0.3.2',
    author='Yong Zhao',
    author_email='[email protected]',
    description='The Python interface for Svar plugins',
    url='https://github.com/zdzhaoyong/Svar',
    package_data = {
        # If any package contains *.txt or *.rst files, include them:
        '': ['src',"cmake","*.txt"],
    },
    include_package_data = True,
    license='BSD',
    long_description='The Python interface for Svar plugins',
    ext_modules=[CMakeExtension('svar')],
    cmdclass=dict(build_ext=CMakeBuild),
    zip_safe=False,
)