#!/usr/bin/env python
# -*- coding: utf-8 -*-
import sys
import os
import platform
import sysconfig
import shutil
import glob

from setuptools import find_packages
from setuptools.dist import Distribution

# need to use distutils.core for correct placement of cython dll
if '--inplace' in sys.argv:
    from distutils.core import setup
    from distutils.extension import Extension
else:
    from setuptools import setup
    from setuptools.extension import Extension


class BinaryDistribution(Distribution):
    def has_ext_modules(self):
        return True


CURRENT_DIR = os.path.dirname(__file__)


def get_lib_path():
    """Get library path, name and version"""
    # We can not import `libinfo.py` in setup.py directly since __init__.py
    # Will be invoked which introduces dependences
    libinfo_py = os.path.join(CURRENT_DIR, './dgl/_ffi/libinfo.py')
    libinfo = {'__file__': libinfo_py}
    exec(
        compile(open(libinfo_py, "rb").read(), libinfo_py, 'exec'),
        libinfo,
        libinfo)
    version = libinfo['__version__']

    lib_path = libinfo['find_lib_path']()
    libs = [lib_path[0]]

    return libs, version


def get_ta_lib_pattern():
    if sys.platform.startswith('linux'):
        ta_lib_pattern = 'libtensoradapter_*.so'
    elif sys.platform.startswith('darwin'):
        ta_lib_pattern = 'libtensoradapter_*.dylib'
    elif sys.platform.startswith('win'):
        ta_lib_pattern = 'tensoradapter_*.dll'
    else:
        raise NotImplementedError('Unsupported system: %s' % sys.platform)
    return ta_lib_pattern


LIBS, VERSION = get_lib_path()
BACKENDS = ['pytorch']
TA_LIB_PATTERN = get_ta_lib_pattern()


def cleanup():
    # Wheel cleanup
    try:
        os.remove("MANIFEST.in")
    except BaseException:
        pass

    for path in LIBS:
        _, libname = os.path.split(path)
        try:
            os.remove(os.path.join("dgl", libname))
        except BaseException:
            pass
    for backend in BACKENDS:
        for ta_path in glob.glob(
            os.path.join(
                CURRENT_DIR,
                "dgl",
                "tensoradapter",
                backend,
                TA_LIB_PATTERN)):
            try:
                os.remove(ta_path)
            except BaseException:
                pass


def config_cython():
    """Try to configure cython and return cython configuration"""
    if sys.platform.startswith('win'):
        print("WARNING: Cython is not supported on Windows, will compile without cython module")
        return []
    sys_cflags = sysconfig.get_config_var("CFLAGS")

    if "i386" in sys_cflags and "x86_64" in sys_cflags:
        print(
            "WARNING: Cython library may not be compiled correctly with both i386 and x64")
        return []
    try:
        from Cython.Build import cythonize
        # from setuptools.extension import Extension
        if sys.version_info >= (3, 0):
            subdir = "_cy3"
        else:
            subdir = "_cy2"
        ret = []
        path = "dgl/_ffi/_cython"
        library_dirs = ['dgl', '../build/Release', '../build']
        libraries = ['dgl']
        for fn in os.listdir(path):
            if not fn.endswith(".pyx"):
                continue
            ret.append(Extension(
                "dgl._ffi.%s.%s" % (subdir, fn[:-4]),
                ["dgl/_ffi/_cython/%s" % fn],
                include_dirs=["../include/",
                              "../third_party/dmlc-core/include",
                              "../third_party/dlpack/include",
                              ],
                library_dirs=library_dirs,
                libraries=libraries,
                # Crashes without this flag with GCC 5.3.1
                extra_compile_args=["-std=c++11"],
                language="c++"))
        return cythonize(ret, force=True)
    except ImportError:
        print("WARNING: Cython is not installed, will compile without cython module")
        return []


include_libs = False
wheel_include_libs = False
if "bdist_wheel" in sys.argv or os.getenv('CONDA_BUILD'):
    wheel_include_libs = True
elif "clean" in sys.argv:
    cleanup()
else:
    include_libs = True

setup_kwargs = {}

# For bdist_wheel only
if wheel_include_libs:
    with open("MANIFEST.in", "w") as fo:
        for path in LIBS:
            shutil.copy(path, os.path.join(CURRENT_DIR, 'dgl'))
            dir_, libname = os.path.split(path)
            fo.write("include dgl/%s\n" % libname)

        for backend in BACKENDS:
            for ta_path in glob.glob(
                os.path.join(
                    dir_,
                    "tensoradapter",
                    backend,
                    TA_LIB_PATTERN)):
                ta_name = os.path.basename(ta_path)
                os.makedirs(
                    os.path.join(
                        CURRENT_DIR,
                        'dgl',
                        'tensoradapter',
                        backend),
                    exist_ok=True)
                shutil.copy(
                    os.path.join(dir_, 'tensoradapter', backend, ta_name),
                    os.path.join(CURRENT_DIR, 'dgl', 'tensoradapter', backend))
                fo.write(
                    "include dgl/tensoradapter/%s/%s\n" %
                    (backend, ta_name))

    setup_kwargs = {
        "include_package_data": True
    }

# For source tree setup
# Conda build also includes the binary library
if include_libs:
    rpath = [os.path.relpath(path, CURRENT_DIR) for path in LIBS]
    data_files = [('dgl', rpath)]
    for path in LIBS:
        for backend in BACKENDS:
            data_files.append((
                'dgl/tensoradapter/%s' % backend,
                glob.glob(os.path.join(
                    os.path.dirname(os.path.relpath(path, CURRENT_DIR)),
                    'tensoradapter', backend, TA_LIB_PATTERN))))
    setup_kwargs = {
        "include_package_data": True,
        "data_files": data_files
    }

setup(
    name='dgl' + os.getenv('DGL_PACKAGE_SUFFIX', ''),
    version=VERSION,
    description='Deep Graph Library',
    zip_safe=False,
    maintainer='DGL Team',
    maintainer_email='wmjlyjemaine@gmail.com',
    packages=find_packages(),
    install_requires=[
        'numpy>=1.14.0',
        'scipy>=1.1.0',
        'networkx>=2.1',
        'requests>=2.19.0',
        'tqdm',
        'psutil>=5.8.0',
    ],
    url='https://github.com/dmlc/dgl',
    distclass=BinaryDistribution,
    ext_modules=config_cython(),
    classifiers=[
        'Development Status :: 3 - Alpha',
        'Programming Language :: Python :: 3',
        'License :: OSI Approved :: Apache Software License',
    ],
    license='APACHE',
    **setup_kwargs
)

if wheel_include_libs:
    cleanup()