# Adapted from https://github.com/pybind/cmake_example/blob/master/setup.py
import os
import re
import sys
import platform
import subprocess
import importlib
from sysconfig import get_paths

import importlib
from setuptools import setup, Extension
from setuptools.command.build_ext import build_ext
from setuptools.command.install import install
from distutils.sysconfig import get_config_var
from distutils.version import LooseVersion


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


class Build(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))

        super().run()

    def build_extension(self, ext):
        if isinstance(ext, CMakeExtension):
            extdir = os.path.abspath(os.path.dirname(self.get_ext_fullpath(ext.name)))
            info = get_paths()
            include_path = info['include']
            cmake_args = ['-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=' + extdir,
                          '-DPYTHON_INCLUDE_PATH=' + include_path,
                          ]

            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),
                               '-DCMAKE_RUNTIME_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 += ['--', '-j8']

            if ext.build_with_cuda:
                cmake_args += ['-DDIFFVG_CUDA=1']
            else:
                cmake_args += ['-DDIFFVG_CUDA=0']

            env = os.environ.copy()
            env['CXXFLAGS'] = '{} -DVERSION_INFO=\\"{}\\"'.format(env.get('CXXFLAGS', ''),
                                                                  self.distribution.get_version())
            env_build = env
            env["CXX"] = "/usr/bin/g++-5"
            env["CC"] = "/usr/bin/gcc-5"
            env_build["CXX"] = "/usr/bin/g++-5"
            env_build["CC"] = "/usr/bin/gcc-5"
            env["PATH"] = "/usr/local/cuda-10.1/bin" + ":" + os.environ['PATH']
            env_build["PATH"] = "/usr/local/cuda-10.1/bin" + ":" + os.environ['PATH']

            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, env=env_build)
        else:
            super().build_extension(ext)


torch_spec = importlib.util.find_spec("torch")
tf_spec = importlib.util.find_spec("tensorflow")
packages = []
build_with_cuda = False
if torch_spec is not None:
    packages.append('pydiffvg')
    import torch

    if torch.cuda.is_available():
        build_with_cuda = True
if tf_spec is not None and sys.platform != 'win32':
    packages.append('pydiffvg_tensorflow')
    if not build_with_cuda:
        import tensorflow as tf

        if tf.test.is_gpu_available(cuda_only=True, min_cuda_compute_capability=None):
            build_with_cuda = True
if len(packages) == 0:
    print('Error: PyTorch or Tensorflow must be installed. For Windows platform only PyTorch is supported.')
    exit()
# Override build_with_cuda with environment variable
if 'DIFFVG_CUDA' in os.environ:
    build_with_cuda = os.environ['DIFFVG_CUDA'] == '1'

setup(name='diffvg',
      version='0.0.1',
      install_requires=["svgpathtools"],
      description='Differentiable Vector Graphics',
      ext_modules=[CMakeExtension('diffvg', '', build_with_cuda)],
      cmdclass=dict(build_ext=Build, install=install),
      packages=packages,
      zip_safe=False)

[(81, 'importlib.util.find_spec', 'importlib.util.find_spec', False, 'import importlib\n'), (82, 'importlib.util.find_spec', 'importlib.util.find_spec', False, 'import importlib\n'), (89, 'torch.cuda.is_available', 'torch.cuda.is_available', False, 'import torch\n'), (20, 'setuptools.Extension.__init__', 'Extension.__init__', False, 'from setuptools import setup, Extension\n'), (21, 'os.path.abspath', 'os.path.abspath', False, 'import os\n'), (96, 'tensorflow.test.is_gpu_available', 'tf.test.is_gpu_available', True, 'import tensorflow as tf\n'), (28, 'subprocess.check_output', 'subprocess.check_output', False, 'import subprocess\n'), (38, 'sysconfig.get_paths', 'get_paths', False, 'from sysconfig import get_paths\n'), (62, 'os.environ.copy', 'os.environ.copy', False, 'import os\n'), (75, 'subprocess.check_call', 'subprocess.check_call', False, 'import subprocess\n'), (76, 'subprocess.check_call', 'subprocess.check_call', False, 'import subprocess\n'), (47, 'platform.system', 'platform.system', False, 'import platform\n'), (73, 'os.path.exists', 'os.path.exists', False, 'import os\n'), (74, 'os.makedirs', 'os.makedirs', False, 'import os\n')]