import os
import re
import sys
import platform
import subprocess

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

python_Path = sys.executable
python_Root = sys.exec_prefix
print("==> python_Path =", python_Path)


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))

        cmake_version = LooseVersion(re.search(r"version\s*([\d.]+)", out.decode()).group(1))
        if cmake_version < LooseVersion("3.5.0"):
            raise RuntimeError("CMake >= 3.5.0 is required")

        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,
            "-DPython3_EXECUTABLE=" + python_Path,
            "-DPython3_ROOT_DIR=" + python_Root,
            "-DPYTB2=ON",
        ]

        build_type = os.environ.get("BUILD_TYPE", "Release")
        build_args = ["--config", build_type]

        # Pile all .so in one place and use $ORIGIN as RPATH
        cmake_args += ["-DCMAKE_BUILD_WITH_INSTALL_RPATH=TRUE"]
        cmake_args += ["-DCMAKE_INSTALL_RPATH={}".format("$ORIGIN")]

        if platform.system() == "Windows":
            cmake_args += ["-DCMAKE_LIBRARY_OUTPUT_DIRECTORY_{}={}".format(build_type.upper(), extdir)]
            if sys.maxsize > 2**32:
                cmake_args += ["-A", "x64"]
            build_args += ["--", "/m"]
        else:
            cmake_args += ["-DCMAKE_BUILD_TYPE=" + build_type]
            build_args += ["--", "-j4"]

        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_args:", cmake_args)
        subprocess.check_call(["cmake", ext.sourcedir] + cmake_args, cwd=self.build_temp, env=env)
        subprocess.check_call(["cmake", "--build", ".", "--target", os.path.basename("pytb2")] + build_args, cwd=self.build_temp)


def read_version():
    return subprocess.run(["git", "describe", "--abbrev=0", "--tags", "--always"], capture_output=True).stdout.strip().decode("utf-8")


setup(
    name="pytoulbar2",
    version="0.0.0.3-1", # hash c9d8388a41bdbcea4a5a1f8e860213fe5d9eda8a
    author="ToulBar2 team",
    author_email="thomas.schiex@inrae.fr",
    description="ToulBar2 Python package",
    long_description_content_type="text/markdown",
    license="MIT",
    keywords="optimization graphical-model",
    long_description=open("README.md").read(),
    ext_modules=[CMakeExtension("pytoulbar2.pytb2")],
    packages=["pytoulbar2"],
    package_dir={"pytoulbar2": "pytoulbar2"},
    cmdclass=dict(build_ext=CMakeBuild),
    url="http://miat.inrae.fr/toulbar2",
    zip_safe=False,
    classifiers=[
        "License :: OSI Approved :: MIT License",
        "Topic :: Scientific/Engineering :: Artificial Intelligence",
        "Topic :: Scientific/Engineering :: Mathematics",
        "Programming Language :: C++",
        "Programming Language :: Python :: 3",
        "Intended Audience :: Science/Research",
    ],
)
