import os
import sys
import platform
import subprocess
from setuptools import setup, find_packages, Extension
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 build_extension(self, ext):
        extdir = os.path.abspath(os.path.dirname(self.get_ext_fullpath(ext.name)))
        cmake_args = [
            f"-DCMAKE_LIBRARY_OUTPUT_DIRECTORY={extdir}",
            f"-DPYTHON_EXECUTABLE={sys.executable}",
            f"-DPython3_EXECUTABLE={sys.executable}",
        ]

        cfg = "Debug" if self.debug else "Release"
        build_args = ["--config", cfg]

        if platform.system() == "Windows":
            cmake_args += [
                f"-DCMAKE_LIBRARY_OUTPUT_DIRECTORY_{cfg.upper()}={extdir}",
                "-A", "x64"
            ]
        else:
            cmake_args += [f"-DCMAKE_BUILD_TYPE={cfg}"]
            build_args += ["--", f"-j{os.cpu_count() or 4}"]

        build_temp = os.path.join(self.build_temp, ext.name)
        os.makedirs(build_temp, exist_ok=True)

        subprocess.check_call(["cmake", ext.sourcedir] + cmake_args, cwd=build_temp)
        subprocess.check_call(["cmake", "--build", "."] + build_args, cwd=build_temp)

setup(
    name="cudaslicer",
    version="1.0.0",
    package_dir={"": "python"},
    packages=find_packages(where="python"),
    ext_modules=[CMakeExtension("cudaslicer._cudaslicer_backend")],
    cmdclass={"build_ext": CMakeBuild},
)