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from distutils import extension
import errno
import os
import os.path
import shlex
import shutil
import sys

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('.'))

# 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.
# By default we assume a GCC-like compiler.
EXTRA_COMPILE_ARGS = shlex.split(os.environ.get('GRPC_PYTHON_CFLAGS',
                                                '-fno-wrapv -frtti -std=c++11'))
EXTRA_LINK_ARGS = shlex.split(os.environ.get('GRPC_PYTHON_LDFLAGS',
                                             '-lpthread'))

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

import protoc_lib_deps
import grpc_version

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 protoc_lib_deps.PROTO_FILES:
    source = os.path.join(protoc_lib_deps.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 protoc_ext_module():
  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=['grpc/tools/protoc_compiler.pyx'] + plugin_sources,
      include_dirs=[
          '.',
          'grpc_root',
          'grpc_root/include',
          protoc_lib_deps.CC_INCLUDE,
      ],
      language='c++',
      define_macros=[('HAVE_PTHREAD', 1)],
      extra_compile_args=EXTRA_COMPILE_ARGS,
      extra_link_args=EXTRA_LINK_ARGS,
  )
  return plugin_ext

def maybe_cythonize(exts):
  from Cython import Build
  return Build.cythonize(exts)

setuptools.setup(
  name='grpcio_tools',
  version=grpc_version.VERSION,
  license='3-clause BSD',
  ext_modules=maybe_cythonize([
      protoc_ext_module(),
  ]),
  packages=setuptools.find_packages('.'),
  namespace_packages=['grpc'],
  install_requires=[
    'protobuf>=3.0.0a3',
    'grpcio>=0.14.0',
  ],
  package_data=package_data(),
)