# Copyright 2016, Google Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
#     * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
#     * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

from distutils import extension
from distutils import util
import errno
import os
import os.path
import pkg_resources
import platform
import re
import shlex
import shutil
import sys
import sysconfig

import setuptools
from setuptools.command import build_ext

# TODO(atash) add flag to disable Cython use

os.chdir(os.path.dirname(os.path.abspath(__file__)))
sys.path.insert(0, os.path.abspath('.'))

import protoc_lib_deps
import grpc_version

PY3 = sys.version_info.major == 3

# Environment variable to determine whether or not the Cython extension should
# *use* Cython or use the generated C files. Note that this requires the C files
# to have been generated by building first *with* Cython support.
BUILD_WITH_CYTHON = os.environ.get('GRPC_PYTHON_BUILD_WITH_CYTHON', False)

# There are some situations (like on Windows) where CC, CFLAGS, and LDFLAGS are
# entirely ignored/dropped/forgotten by distutils and its Cygwin/MinGW support.
# We use these environment variables to thus get around that without locking
# ourselves in w.r.t. the multitude of operating systems this ought to build on.
# We can also use these variables as a way to inject environment-specific
# compiler/linker flags. We assume GCC-like compilers and/or MinGW as a
# reasonable default.
EXTRA_ENV_COMPILE_ARGS = os.environ.get('GRPC_PYTHON_CFLAGS', None)
EXTRA_ENV_LINK_ARGS = os.environ.get('GRPC_PYTHON_LDFLAGS', None)
if EXTRA_ENV_COMPILE_ARGS is None:
  EXTRA_ENV_COMPILE_ARGS = '-fno-wrapv -frtti -std=c++11'
  if 'win32' in sys.platform:
    # We use define flags here and don't directly add to DEFINE_MACROS below to
    # ensure that the expert user/builder has a way of turning it off (via the
    # envvars) without adding yet more GRPC-specific envvars.
    # See https://sourceforge.net/p/mingw-w64/bugs/363/
    if '32' in platform.architecture()[0]:
      EXTRA_ENV_COMPILE_ARGS += ' -D_ftime=_ftime32 -D_timeb=__timeb32 -D_ftime_s=_ftime32_s'
    else:
      EXTRA_ENV_COMPILE_ARGS += ' -D_ftime=_ftime64 -D_timeb=__timeb64'
if EXTRA_ENV_LINK_ARGS is None:
  EXTRA_ENV_LINK_ARGS = '-lpthread'
  if 'win32' in sys.platform:
    # TODO(atash) check if this is actually safe to just import and call on
    # non-Windows (to avoid breaking import style)
    from distutils.cygwinccompiler import get_msvcr
    msvcr = get_msvcr()[0]
    EXTRA_ENV_LINK_ARGS += (
        ' -static-libgcc -static-libstdc++ -mcrtdll={msvcr} '
        '-static'.format(msvcr=msvcr))
EXTRA_COMPILE_ARGS = shlex.split(EXTRA_ENV_COMPILE_ARGS)
EXTRA_LINK_ARGS = shlex.split(EXTRA_ENV_LINK_ARGS)

CC_FILES = [
  os.path.normpath(cc_file) for cc_file in protoc_lib_deps.CC_FILES]
PROTO_FILES = [
  os.path.normpath(proto_file) for proto_file in protoc_lib_deps.PROTO_FILES]
CC_INCLUDE = os.path.normpath(protoc_lib_deps.CC_INCLUDE)
PROTO_INCLUDE = os.path.normpath(protoc_lib_deps.PROTO_INCLUDE)

GRPC_PYTHON_TOOLS_PACKAGE = 'grpc.tools'
GRPC_PYTHON_PROTO_RESOURCES_NAME = '_proto'

DEFINE_MACROS = (('HAVE_PTHREAD', 1),)
if "win32" in sys.platform and '64bit' in platform.architecture()[0]:
  DEFINE_MACROS += (('MS_WIN64', 1),)

# By default, Python3 distutils enforces compatibility of
# c plugins (.so files) with the OSX version Python3 was built with.
# For Python3.4, this is OSX 10.6, but we need Thread Local Support (__thread)
if 'darwin' in sys.platform and PY3:
  mac_target = sysconfig.get_config_var('MACOSX_DEPLOYMENT_TARGET')
  if mac_target and (pkg_resources.parse_version(mac_target) <
		     pkg_resources.parse_version('10.9.0')):
    os.environ['MACOSX_DEPLOYMENT_TARGET'] = '10.9'
    os.environ['_PYTHON_HOST_PLATFORM'] = re.sub(
        r'macosx-[0-9]+\.[0-9]+-(.+)',
        r'macosx-10.9-\1',
        util.get_platform())

def package_data():
  tools_path = GRPC_PYTHON_TOOLS_PACKAGE.replace('.', os.path.sep)
  proto_resources_path = os.path.join(tools_path,
                                      GRPC_PYTHON_PROTO_RESOURCES_NAME)
  proto_files = []
  for proto_file in PROTO_FILES:
    source = os.path.join(PROTO_INCLUDE, proto_file)
    target = os.path.join(proto_resources_path, proto_file)
    relative_target = os.path.join(GRPC_PYTHON_PROTO_RESOURCES_NAME, proto_file)
    try:
      os.makedirs(os.path.dirname(target))
    except OSError as error:
      if error.errno == errno.EEXIST:
        pass
      else:
        raise
    shutil.copy(source, target)
    proto_files.append(relative_target)
  return {GRPC_PYTHON_TOOLS_PACKAGE: proto_files}

def extension_modules():
  if BUILD_WITH_CYTHON:
    plugin_sources = ['grpc/tools/_protoc_compiler.pyx']
  else:
    plugin_sources = ['grpc/tools/_protoc_compiler.cpp']
  plugin_sources += [
      'grpc/tools/main.cc',
      'grpc_root/src/compiler/python_generator.cc'] + [
      os.path.join(protoc_lib_deps.CC_INCLUDE, cc_file)
      for cc_file in protoc_lib_deps.CC_FILES]
  plugin_ext = extension.Extension(
      name='grpc.tools._protoc_compiler',
      sources=plugin_sources,
      include_dirs=[
          '.',
          'grpc_root',
          os.path.join('grpc_root', 'include'),
          CC_INCLUDE,
      ],
      language='c++',
      define_macros=list(DEFINE_MACROS),
      extra_compile_args=list(EXTRA_COMPILE_ARGS),
      extra_link_args=list(EXTRA_LINK_ARGS),
  )
  extensions = [plugin_ext]
  if BUILD_WITH_CYTHON:
    from Cython import Build
    return Build.cythonize(extensions)
  else:
    return extensions

setuptools.setup(
  name='grpcio_tools',
  version=grpc_version.VERSION,
  license='3-clause BSD',
  ext_modules=extension_modules(),
  packages=setuptools.find_packages('.'),
  namespace_packages=['grpc'],
  install_requires=[
    'protobuf>=3.0.0a3',
    'grpcio>=0.15.0',
  ],
  package_data=package_data(),
)