import glob
import os
import platform
import sys
import shutil
import subprocess

from setuptools import setup, Extension, find_packages
from setuptools.command.build_ext import build_ext
from distutils.command.build_py import build_py as _build_py
from distutils.command.clean import clean as _clean
from distutils.spawn import find_executable

HERE = os.path.abspath('.')
PYBMIXCPP_PATH = os.path.join(HERE, "pybmix", "core", "pybmixcpp")
BAYEXMIX_PATH = os.path.join(PYBMIXCPP_PATH , "bayesmix_")
PROTO_IN_DIR = os.path.join(BAYEXMIX_PATH, "proto")
PROTO_OUT_DIR = os.path.join(HERE, "pybmix", "proto/")

# Convert distutils Windows platform specifiers to CMake -A arguments
PLAT_TO_CMAKE = {
    "win32": "Win32",
    "win-amd64": "x64",
    "win-arm32": "ARM",
    "win-arm64": "ARM64",
}

py2to3 = find_executable("2to3")


class clean(_clean):
  def run(self):
    # Delete generated files in the code tree.
    for (dirpath, dirnames, filenames) in os.walk("."):
      for filename in filenames:
        filepath = os.path.join(dirpath, filename)
        if filepath.endswith("_pb2.py") or filepath.endswith(".pyc") or \
          filepath.endswith(".so") or filepath.endswith(".o"):
          os.remove(filepath)
    # _clean is an old-style class, so super() doesn't work.
    _clean.run(self)



# A CMakeExtension needs a sourcedir instead of a file list.
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):
        # This is optional - will print a nicer error if CMake is missing.
        # Since we force CMake via PEP 518 in the pyproject.toml, this should
        # never happen and this whole method can be removed in your code if you
        # want.
        try:
            subprocess.check_output(["cmake", "--version"])
        except OSError:
            msg = "CMake missing - probably upgrade to a newer version of Pip?"
            raise RuntimeError(msg)
        
        # To support Python 2, we have to avoid super(), since distutils is all
        # old-style classes.
        build_ext.run(self)

    def build_extension(self, ext):
        extdir = os.path.abspath(os.path.dirname(self.get_ext_fullpath(ext.name)))

        # required for auto-detection of auxiliary "native" libs
        if not extdir.endswith(os.path.sep):
            extdir += os.path.sep

        cfg = "Debug" if self.debug else "Release"

        # CMake lets you override the generator - we need to check this.
        # Can be set with Conda-Build, for example.
        cmake_generator = os.environ.get("CMAKE_GENERATOR", "")

        # Set Python_EXECUTABLE instead if you use PYBIND11_FINDPYTHON
        # EXAMPLE_VERSION_INFO shows you how to pass a value into the C++ code
        # from Python.
        cmake_args = [
            "-DBUILD_RUN=OFF",
            "-DDISABLE_TESTS=ON",
            "-DDISABLE_BENCHMARKS=ON",
            "-DCMAKE_LIBRARY_OUTPUT_DIRECTORY={}".format(extdir),
            "-DPYTHON_EXECUTABLE={}".format(sys.executable),
            "-DEXAMPLE_VERSION_INFO={}".format(self.distribution.get_version()),
            "-DCMAKE_BUILD_TYPE={}".format(cfg),  # not used on MSVC, but no harm
        ]
        build_args = []

        if self.compiler.compiler_type != "msvc":
            # Using Ninja-build since it a) is available as a wheel and b)
            # multithreads automatically. MSVC would require all variables be
            # exported for Ninja to pick it up, which is a little tricky to do.
            # Users can override the generator with CMAKE_GENERATOR in CMake
            # 3.15+.
            if not cmake_generator:
                cmake_args += ["-GNinja"]

        else:

            # Single config generators are handled "normally"
            single_config = any(x in cmake_generator for x in {"NMake", "Ninja"})

            # CMake allows an arch-in-generator style for backward compatibility
            contains_arch = any(x in cmake_generator for x in {"ARM", "Win64"})

            # Specify the arch if using MSVC generator, but only if it doesn't
            # contain a backward-compatibility arch spec already in the
            # generator name.
            if not single_config and not contains_arch:
                cmake_args += ["-A", PLAT_TO_CMAKE[self.plat_name]]

            # Multi-config generators have a different way to specify configs
            if not single_config:
                cmake_args += [
                    "-DCMAKE_LIBRARY_OUTPUT_DIRECTORY_{}={}".format(cfg.upper(), extdir)
                ]
                build_args += ["--config", cfg]

        # 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 += ["-j{}".format(self.parallel)]

        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
        )

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

        two_to_three_command = [
            py2to3, "--output-dir={0}".format(PROTO_OUT_DIR), "-W", "-n", PROTO_OUT_DIR]
        print(" ".join(two_to_three_command))
        if subprocess.call(two_to_three_command) != 0:
            sys.exit(-1)


class build_py(_build_py):
    def run(self):
        self.run_command("build_ext")
        return super().run()


if __name__ == "__main__":

    folder = os.path.dirname(__file__)

    install_requires = ["2to3", "ninja", "numpy", "scipy", "protobuf==3.14.0", "cmake>=3.21.0"]

    # with open(os.path.join(folder, 'requirements.txt')) as fp:
    #     install_requires.extend([line.strip() for line in fp])

    with open(os.path.join(folder, "docs", 'requirements.txt')) as fp:
        install_requires.extend([line.strip() for line in fp])

    setup(
        name="pybmix",
        version="0.0.1",
        author="Mario Beraha",
        author_email="berahamario@gmail.com",
        description="Python Bayesian Mixtures",
        long_description="",
        packages=find_packages(),
        ext_modules=[CMakeExtension('pybmix.core.pybmixcpp')],
        cmdclass={
            "clean": clean,
            "build_ext": CMakeBuild,
            "build_py": build_py
            },
        install_requires=install_requires,
        zip_safe=False,
    )
