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"""Provides distutils command classes for the GRPC Python setup process."""

import distutils
import glob
import os
import os.path
import subprocess
import sys

import setuptools
from setuptools.command import build_py


class BuildProtoModules(setuptools.Command):
  """Command to generate project *_pb2.py modules from proto files."""

  description = ''
  user_options = []

  def initialize_options(self):
    pass

  def finalize_options(self):
    self.protoc_command = distutils.spawn.find_executable('protoc')
    self.grpc_python_plugin_command = distutils.spawn.find_executable(
        'grpc_python_plugin')

  def run(self):
    paths = []
    root_directory = os.getcwd()
    for walk_root, directories, filenames in os.walk(root_directory):
      for filename in filenames:
        if filename.endswith('.proto'):
          paths.append(os.path.join(walk_root, filename))
    command = [
        self.protoc_command,
        '--plugin=protoc-gen-python-grpc={}'.format(
            self.grpc_python_plugin_command),
        '-I {}'.format(root_directory),
        '--python_out={}'.format(root_directory),
        '--python-grpc_out={}'.format(root_directory),
    ] + paths
    try:
      subprocess.check_output(' '.join(command), cwd=root_directory, shell=True,
                              stderr=subprocess.STDOUT)
    except subprocess.CalledProcessError as e:
      raise Exception('{}\nOutput:\n{}'.format(e.message, e.output))


class BuildPy(build_py.build_py):
  """Custom project build command."""

  def run(self):
    self.run_command('build_proto_modules')
    build_py.build_py.run(self)
