import os

import re

import subprocess

import sys

from pathlib import Path

from setuptools import Extension, setup

from setuptools.command.build_ext import build_ext

# A CMakeExtension needs a sourcedir instead of a file list.

# The name must be the _single_ output extension from the CMake build.

# If you need multiple extensions, see scikit-build.

class CMakeExtension(Extension):

    def __init__(self, name: str, sourcedir: str = "") -> None:

        super().__init__(name, sources=[])

        self.sourcedir = os.fspath(Path(sourcedir).resolve())

class CMakeBuild(build_ext):

    def build_extension(self, ext: CMakeExtension) -> None:

        # Must be in this form due to bug in .resolve() only fixed in Python 3.10+

        ext_fullpath = Path.cwd() / self.get_ext_fullpath(ext.name)

        extdir = ext_fullpath.parent.resolve()

        # Using this requires trailing slash for auto-detection & inclusion of

        # auxiliary "native" libs

        debug = int(os.environ.get("DEBUG", 0)) if self.debug is None else self.debug

        cfg = "Debug" if debug else "Release"

        # Set Python_EXECUTABLE instead if you use PYBIND11_FINDPYTHON

        cmake_args = [

            "-DCMAKE_CXX_STANDARD=20",

            f"-DCMAKE_LIBRARY_OUTPUT_DIRECTORY={extdir}{os.sep}",

            f"-DPYTHON_EXECUTABLE={sys.executable}",

            f"-DCMAKE_BUILD_TYPE={cfg}",  # not used on MSVC, but no harm

        ]

        build_args = []

        # Adding CMake arguments set as environment variable

        # (needed e.g. to build for ARM OSx on conda-forge)

        if "CMAKE_ARGS" in os.environ:

            cmake_args += [item for item in os.environ["CMAKE_ARGS"].split(" ") if item]

        # Set CMAKE_BUILD_PARALLEL_LEVEL to control the parallel build level

        # across all generators.

        if "CMAKE_BUILD_PARALLEL_LEVEL" not in os.environ:

            # self.parallel is a Python 3 only way to set parallel jobs by hand

            # using -j in the build_ext call, not supported by pip or PyPA-build.

            if hasattr(self, "parallel") and self.parallel:

                # CMake 3.12+ only.

                build_args += [f"-j{self.parallel}"]

        build_temp = Path(self.build_temp) / ext.name

        if not build_temp.exists():

            build_temp.mkdir(parents=True)

        print(["cmake", ext.sourcedir, *cmake_args])

        subprocess.run(

            ["cmake", ext.sourcedir, *cmake_args], cwd=build_temp, check=True

        )

        print(["cmake", "--build", ".", *build_args])

        subprocess.run(

            ["cmake", "--build", ".", *build_args], cwd=build_temp, check=True

        )

# The information here can also be placed in setup.cfg - better separation of

# logic and declaration, and simpler if you include description/version in a file.

setup(

    name="ext_obj_func",

    version="0.3.0",

    author="DuanYue",

    author_email="imduanyue@qq.com",

    description="Objective function for a scheduling problem",

    long_description="",

    ext_modules=[CMakeExtension("ext_obj_func")],

    cmdclass={"build_ext": CMakeBuild},

    zip_safe=False,

)