# Notes on cuda packaging https://pypackaging-native.github.io/key-issues/gpus/


import os
from os import path
import re
import subprocess
import sys
import sysconfig

import setuptools
from setuptools import Extension, setup
from setuptools.command.build_ext import build_ext

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

def get_version_with_cuda(version_number):
    suffix = os.environ.get("ACCRQA_CUDA_VERSION", "")
    print("Suffix:-"+suffix+"-")
    if suffix != "":
        suffix = suffix.replace(".", "")
        suffix = "-cu" + suffix[:3]
    version = version_number + suffix
    return version_number
    
def get_version():
    init_py_path = path.join(path.abspath(path.dirname(__file__)), "version.txt")
    version = open(init_py_path, "r").readlines()
    return version[0]

def path_to_build_folder():
    """Returns the name of a distutils build directory"""
    f = "{dirname}.{platform}-{version[0]}.{version[1]}"
    dir_name = f.format(dirname='lib',
                    platform=sysconfig.get_platform(),
                    version=sys.version_info)
    return os.path.join('build', dir_name, 'accrqa')

# 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, 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)))

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

        debug = int(os.environ.get("DEBUG", 0)) if self.debug is None else self.debug
        cfg = "Debug" if 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 = [
            f"-DCMAKE_LIBRARY_OUTPUT_DIRECTORY={extdir}",
            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]

        # In this example, we pass in the version to C++. You might not need to.
        # cmake_args += [f"-DEXAMPLE_VERSION_INFO={self.distribution.get_version()}"]

        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:
                try:
                    import ninja  # noqa: F401

                    cmake_args += ["-GNinja"]
                except ImportError:
                    pass

        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 += [
                    f"-DCMAKE_LIBRARY_OUTPUT_DIRECTORY_{cfg.upper()}={extdir}"
                ]
                build_args += ["--config", cfg]

        if sys.platform.startswith("darwin"):
            # Cross-compile support for macOS - respect ARCHFLAGS if set
            archs = re.findall(r"-arch (\S+)", os.environ.get("ARCHFLAGS", ""))
            if archs:
                cmake_args += ["-DCMAKE_OSX_ARCHITECTURES={}".format(";".join(archs))]

        # 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}"]

        if not os.path.exists(self.build_temp):
            os.makedirs(self.build_temp)
        
        cmake_args += [f"-DCMAKE_INSTALL_PREFIX={extdir}"]
        cmake_args += [f"-DCUDA_ARCH=ALL"]
        print(cmake_args)
        subprocess.check_call(
            ["cmake", ext.sourcedir] + cmake_args, cwd=self.build_temp
        )
        subprocess.check_call(
            ["cmake", "--build", "."] + build_args, cwd=self.build_temp
        )
        subprocess.check_call(
            ["cmake", "--install", "."] + ["--config", cfg], cwd=self.build_temp
        )
        # if windows add install step into path_to_build_folder() and add DLLs
        # as package_data in the python package.

setup(
    name="accrqa",
    version=get_version(),
    description="AccRQA calculates recurrence quantification analysis (RQA) metrics using CUDA",
    ext_modules=[CMakeExtension("accrqa")],
    cmdclass={"build_ext": CMakeBuild},
    packages=setuptools.find_namespace_packages(where="src"),
    package_dir={"": "src"},
    include_package_data=True,
    classifiers=[
        "Development Status :: 3 - Alpha",
        "Environment :: Console",
        "Environment :: GPU :: NVIDIA CUDA :: 7.0",
        "Intended Audience :: Science/Research",
        "License :: OSI Approved :: MIT License",
        "Natural Language :: English",
        "Programming Language :: Python :: 3",
        "Topic :: Scientific/Engineering"
    ],
    install_requires=['numpy >= 1.7.0', 'pandas >= 1.4.3'],
    setup_requires=['setuptools >= 63.1.0', 'wheel', 'cmake>=3.13'],
    author=["Adamek Karel", "Novotny Jan", "Panis Radim", "Marwan Norbert"],
    url="https://github.com/KAdamek/AccRQA",
    license="MIT"
)


