# coding: utf-8
# pylint: disable=invalid-name, exec-used, C0111
"""Setup lightgbm package."""
from __future__ import absolute_import

import distutils
import io
import logging
import os
import shutil
import struct
import subprocess
import sys

from platform import system
from setuptools import find_packages, setup
from setuptools.command.install import install
from setuptools.command.install_lib import install_lib
from setuptools.command.sdist import sdist


def find_lib():
    libpath_py = os.path.join(CURRENT_DIR, 'lightgbm', 'libpath.py')
    libpath = {'__file__': libpath_py}
    exec(compile(open(libpath_py, "rb").read(), libpath_py, 'exec'), libpath, libpath)

    LIB_PATH = [os.path.relpath(path, CURRENT_DIR) for path in libpath['find_lib_path']()]
    logger.info("Installing lib_lightgbm from: %s" % LIB_PATH)
    return LIB_PATH


def copy_files(use_gpu=False):

    def copy_files_helper(folder_name):
        src = os.path.join(CURRENT_DIR, os.path.pardir, folder_name)
        if os.path.exists(src):
            dst = os.path.join(CURRENT_DIR, 'compile', folder_name)
            shutil.rmtree(dst, ignore_errors=True)
            distutils.dir_util.copy_tree(src, dst, verbose=0)
        else:
            raise Exception('Cannot copy {0} folder'.format(src))

    if not os.path.isfile(os.path.join(CURRENT_DIR, '_IS_SOURCE_PACKAGE.txt')):
        copy_files_helper('include')
        copy_files_helper('src')
        if not os.path.exists(os.path.join(CURRENT_DIR, "compile", "windows")):
            os.makedirs(os.path.join(CURRENT_DIR, "compile", "windows"))
        distutils.file_util.copy_file(os.path.join(CURRENT_DIR, os.path.pardir, "windows", "LightGBM.sln"),
                                      os.path.join(CURRENT_DIR, "compile", "windows", "LightGBM.sln"),
                                      verbose=0)
        distutils.file_util.copy_file(os.path.join(CURRENT_DIR, os.path.pardir, "windows", "LightGBM.vcxproj"),
                                      os.path.join(CURRENT_DIR, "compile", "windows", "LightGBM.vcxproj"),
                                      verbose=0)
        if use_gpu:
            copy_files_helper('compute')
        distutils.file_util.copy_file(os.path.join(CURRENT_DIR, os.path.pardir, "CMakeLists.txt"),
                                      os.path.join(CURRENT_DIR, "compile", "CMakeLists.txt"),
                                      verbose=0)
        distutils.file_util.copy_file(os.path.join(CURRENT_DIR, os.path.pardir, "LICENSE"),
                                      os.path.join(CURRENT_DIR, "LICENSE"),
                                      verbose=0)


def clear_path(path):
    if os.path.isdir(path):
        contents = os.listdir(path)
        for file_name in contents:
            file_path = os.path.join(path, file_name)
            if os.path.isfile(file_path):
                os.remove(file_path)
            else:
                shutil.rmtree(file_path)


def silent_call(cmd, raise_error=False, error_msg=''):
    try:
        output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
        with open(LOG_PATH, "ab") as log:
            log.write(output)
        return 0
    except Exception as err:
        if isinstance(err, subprocess.CalledProcessError):
            with open(LOG_PATH, "ab") as log:
                log.write(err.output)
        if raise_error:
            raise Exception("\n".join((error_msg, LOG_NOTICE)))
        return 1


def compile_cpp(use_mingw=False, use_gpu=False, use_mpi=False, nomp=False,
                use_hdfs=False, boost_root=None, boost_dir=None,
                boost_include_dir=None, boost_librarydir=None,
                opencl_include_dir=None, opencl_library=None,
                openmp_include_dir=None, openmp_library=None):

    if os.path.exists(os.path.join(CURRENT_DIR, "build_cpp")):
        shutil.rmtree(os.path.join(CURRENT_DIR, "build_cpp"))
    os.makedirs(os.path.join(CURRENT_DIR, "build_cpp"))
    os.chdir(os.path.join(CURRENT_DIR, "build_cpp"))

    logger.info("Starting to compile the library.")

    cmake_cmd = ["cmake", "../compile/"]
    if use_gpu:
        cmake_cmd.append("-DUSE_GPU=ON")
        if boost_root:
            cmake_cmd.append("-DBOOST_ROOT={0}".format(boost_root))
        if boost_dir:
            cmake_cmd.append("-DBoost_DIR={0}".format(boost_dir))
        if boost_include_dir:
            cmake_cmd.append("-DBoost_INCLUDE_DIR={0}".format(boost_include_dir))
        if boost_librarydir:
            cmake_cmd.append("-DBOOST_LIBRARYDIR={0}".format(boost_librarydir))
        if opencl_include_dir:
            cmake_cmd.append("-DOpenCL_INCLUDE_DIR={0}".format(opencl_include_dir))
        if opencl_library:
            cmake_cmd.append("-DOpenCL_LIBRARY={0}".format(opencl_library))
    if use_mpi:
        cmake_cmd.append("-DUSE_MPI=ON")
    if nomp:
        cmake_cmd.append("-DUSE_OPENMP=OFF")
    if use_hdfs:
        cmake_cmd.append("-DUSE_HDFS=ON")

    if system() in ('Windows', 'Microsoft'):
        if use_mingw:
            if use_mpi:
                raise Exception('MPI version cannot be compiled by MinGW due to the miss of MPI library in it')
            logger.info("Starting to compile with CMake and MinGW.")
            silent_call(cmake_cmd + ["-G", "MinGW Makefiles"], raise_error=True,
                        error_msg='Please install CMake and all required dependencies first')
            silent_call(["mingw32-make.exe", "_lightgbm"], raise_error=True,
                        error_msg='Please install MinGW first')
        else:
            status = 1
            lib_path = os.path.join(CURRENT_DIR, "compile", "windows", "x64", "DLL", "lib_lightgbm.dll")
            if not any((use_gpu, use_mpi, use_hdfs)):
                logger.info("Starting to compile with MSBuild from existing solution file.")
                platform_toolsets = ("v142", "v141", "v140")
                for pt in platform_toolsets:
                    status = silent_call(["MSBuild",
                                          os.path.join(CURRENT_DIR, "compile", "windows", "LightGBM.sln"),
                                          "/p:Configuration=DLL",
                                          "/p:Platform=x64",
                                          "/p:PlatformToolset={0}".format(pt)])
                    if status == 0 and os.path.exists(lib_path):
                        break
                    else:
                        clear_path(os.path.join(CURRENT_DIR, "compile", "windows", "x64"))
                if status != 0 or not os.path.exists(lib_path):
                    logger.warning("Compilation with MSBuild from existing solution file failed.")
            if status != 0 or not os.path.exists(lib_path):
                vs_versions = ("Visual Studio 16 2019", "Visual Studio 15 2017", "Visual Studio 14 2015")
                for vs in vs_versions:
                    logger.info("Starting to compile with %s." % vs)
                    status = silent_call(cmake_cmd + ["-G", vs, "-A", "x64"])
                    if status == 0:
                        break
                    else:
                        clear_path(os.path.join(CURRENT_DIR, "build_cpp"))
                if status != 0:
                    raise Exception("\n".join(('Please install Visual Studio or MS Build and all required dependencies first',
                                    LOG_NOTICE)))
                silent_call(["cmake", "--build", ".", "--target", "_lightgbm", "--config", "Release"], raise_error=True,
                            error_msg='Please install CMake first')
    else:  # Linux, Darwin (macOS), etc.
        logger.info("Starting to compile with CMake.")
        # Apple Clang with OpenMP
        if system() == 'Darwin' and not nomp and not (os.environ.get('CC', '').startswith('gcc')
                                                      and os.environ.get('CXX', '').startswith('g++')):
            def get_cmake_opts(openmp_include_dir, openmp_library):
                if openmp_include_dir and openmp_library:
                    return ['-DOpenMP_C_FLAGS=-Xpreprocessor -fopenmp -I{0}'.format(openmp_include_dir),
                            '-DOpenMP_C_LIB_NAMES=omp',
                            '-DOpenMP_CXX_FLAGS=-Xpreprocessor -fopenmp -I{0}'.format(openmp_include_dir),
                            '-DOpenMP_CXX_LIB_NAMES=omp',
                            '-DOpenMP_omp_LIBRARY={0}'.format(openmp_library)]
                else:
                    return []

            status = silent_call(cmake_cmd + get_cmake_opts(openmp_include_dir, openmp_library))
            status += silent_call(["make", "_lightgbm", "-j4"])
            if status != 0:
                logger.warning("Compilation failed.")
                logger.info("Starting to compile with Homebrew OpenMP paths guesses.")
                clear_path(os.path.join(CURRENT_DIR, "build_cpp"))
                status = silent_call(cmake_cmd + get_cmake_opts('/usr/local/opt/libomp/include',
                                                                '/usr/local/opt/libomp/lib/libomp.dylib'))
                status += silent_call(["make", "_lightgbm", "-j4"])
            if status != 0:
                logger.warning("Compilation failed.")
                logger.info("Starting to compile with MacPorts OpenMP paths guesses.")
                clear_path(os.path.join(CURRENT_DIR, "build_cpp"))
                silent_call(cmake_cmd + get_cmake_opts('/opt/local/include/libomp',
                                                       '/opt/local/lib/libomp/libomp.dylib'),
                            raise_error=True, error_msg='Please install CMake and all required dependencies first')
                silent_call(["make", "_lightgbm", "-j4"], raise_error=True,
                            error_msg='An error has occurred while building lightgbm library file')
        else:
            silent_call(cmake_cmd, raise_error=True, error_msg='Please install CMake and all required dependencies first')
            silent_call(["make", "_lightgbm", "-j4"], raise_error=True,
                        error_msg='An error has occurred while building lightgbm library file')
    os.chdir(CURRENT_DIR)


class CustomInstallLib(install_lib):

    def install(self):
        outfiles = install_lib.install(self)
        src = find_lib()[0]
        dst = os.path.join(self.install_dir, 'lightgbm')
        dst, _ = self.copy_file(src, dst)
        outfiles.append(dst)
        return outfiles


class CustomInstall(install):

    user_options = install.user_options + [
        ('mingw', 'm', 'Compile with MinGW'),
        ('gpu', 'g', 'Compile GPU version'),
        ('mpi', None, 'Compile MPI version'),
        ('nomp', None, 'Compile version without OpenMP support'),
        ('hdfs', 'h', 'Compile HDFS version'),
        ('precompile', 'p', 'Use precompiled library'),
        ('boost-root=', None, 'Boost preferred installation prefix'),
        ('boost-dir=', None, 'Directory with Boost package configuration file'),
        ('boost-include-dir=', None, 'Directory containing Boost headers'),
        ('boost-librarydir=', None, 'Preferred Boost library directory'),
        ('opencl-include-dir=', None, 'OpenCL include directory'),
        ('opencl-library=', None, 'Path to OpenCL library'),
        ('openmp-include-dir=', None, 'OpenMP include directory'),
        ('openmp-library=', None, 'Path to OpenMP library')
    ]

    def initialize_options(self):
        install.initialize_options(self)
        self.mingw = 0
        self.gpu = 0
        self.boost_root = None
        self.boost_dir = None
        self.boost_include_dir = None
        self.boost_librarydir = None
        self.opencl_include_dir = None
        self.opencl_library = None
        self.openmp_include_dir = None
        self.openmp_library = None
        self.mpi = 0
        self.hdfs = 0
        self.precompile = 0
        self.nomp = 0

    def run(self):
        open(LOG_PATH, 'wb').close()
        if not self.precompile:
            copy_files(use_gpu=self.gpu)
            compile_cpp(use_mingw=self.mingw, use_gpu=self.gpu, use_mpi=self.mpi, nomp=self.nomp,
                        use_hdfs=self.hdfs, boost_root=self.boost_root, boost_dir=self.boost_dir,
                        boost_include_dir=self.boost_include_dir, boost_librarydir=self.boost_librarydir,
                        opencl_include_dir=self.opencl_include_dir, opencl_library=self.opencl_library,
                        openmp_include_dir=self.openmp_include_dir, openmp_library=self.openmp_library)
        install.run(self)
        if os.path.isfile(LOG_PATH):
            os.remove(LOG_PATH)


class CustomSdist(sdist):

    def run(self):
        copy_files(use_gpu=True)
        open(os.path.join(CURRENT_DIR, '_IS_SOURCE_PACKAGE.txt'), 'w').close()
        if os.path.exists(os.path.join(CURRENT_DIR, 'lightgbm', 'Release')):
            shutil.rmtree(os.path.join(CURRENT_DIR, 'lightgbm', 'Release'))
        if os.path.exists(os.path.join(CURRENT_DIR, 'lightgbm', 'windows', 'x64')):
            shutil.rmtree(os.path.join(CURRENT_DIR, 'lightgbm', 'windows', 'x64'))
        if os.path.isfile(os.path.join(CURRENT_DIR, 'lightgbm', 'lib_lightgbm.so')):
            os.remove(os.path.join(CURRENT_DIR, 'lightgbm', 'lib_lightgbm.so'))
        sdist.run(self)
        if os.path.isfile(os.path.join(CURRENT_DIR, '_IS_SOURCE_PACKAGE.txt')):
            os.remove(os.path.join(CURRENT_DIR, '_IS_SOURCE_PACKAGE.txt'))


if __name__ == "__main__":
    if (8 * struct.calcsize("P")) != 64:
        raise Exception('Cannot install LightGBM in 32-bit Python, please use 64-bit Python instead.')

    CURRENT_DIR = os.path.abspath(os.path.dirname(__file__))
    LOG_PATH = os.path.join(os.path.expanduser('~'), 'LightGBM_compilation.log')
    LOG_NOTICE = "The full version of error log was saved into {0}".format(LOG_PATH)
    if os.path.isfile(os.path.join(CURRENT_DIR, os.path.pardir, 'VERSION.txt')):
        distutils.file_util.copy_file(os.path.join(CURRENT_DIR, os.path.pardir, 'VERSION.txt'),
                                      os.path.join(CURRENT_DIR, 'lightgbm', 'VERSION.txt'),
                                      verbose=0)
    version = io.open(os.path.join(CURRENT_DIR, 'lightgbm', 'VERSION.txt'), encoding='utf-8').read().strip()
    readme = io.open(os.path.join(CURRENT_DIR, 'README.rst'), encoding='utf-8').read()

    sys.path.insert(0, CURRENT_DIR)

    logging.basicConfig(level=logging.INFO)
    logger = logging.getLogger('LightGBM')

    setup(name='lightgbm',
          version=version,
          description='LightGBM Python Package',
          long_description=readme,
          install_requires=[
              'numpy',
              'scipy',
              'scikit-learn'
          ],
          maintainer='Guolin Ke',
          maintainer_email='guolin.ke@microsoft.com',
          zip_safe=False,
          cmdclass={
              'install': CustomInstall,
              'install_lib': CustomInstallLib,
              'sdist': CustomSdist,
          },
          packages=find_packages(),
          include_package_data=True,
          license='The MIT License (Microsoft)',
          url='https://github.com/microsoft/LightGBM',
          classifiers=['Development Status :: 5 - Production/Stable',
                       'Intended Audience :: Science/Research',
                       'License :: OSI Approved :: MIT License',
                       'Natural Language :: English',
                       'Operating System :: MacOS',
                       'Operating System :: Microsoft :: Windows',
                       'Operating System :: POSIX',
                       'Operating System :: Unix',
                       'Programming Language :: Python :: 2',
                       'Programming Language :: Python :: 2.7',
                       'Programming Language :: Python :: 3',
                       'Programming Language :: Python :: 3.5',
                       'Programming Language :: Python :: 3.6',
                       'Programming Language :: Python :: 3.7',
                       'Topic :: Scientific/Engineering :: Artificial Intelligence'])
