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

import distutils
import glob
import os
import os.path
import platform
import re
import shutil
import subprocess
import sys
import traceback

import setuptools
from setuptools.command import build_ext
from setuptools.command import build_py
from setuptools.command import easy_install
from setuptools.command import install
from setuptools.command import test

PYTHON_STEM = os.path.dirname(os.path.abspath(__file__))
GRPC_STEM = os.path.abspath(PYTHON_STEM + '../../../../')
GRPC_PROTO_STEM = os.path.join(GRPC_STEM, 'src', 'proto')
PROTO_STEM = os.path.join(PYTHON_STEM, 'src', 'proto')
PYTHON_PROTO_TOP_LEVEL = os.path.join(PYTHON_STEM, 'src')


class CommandError(object):
  pass


class GatherProto(setuptools.Command):

  description = 'gather proto dependencies'
  user_options = []

  def initialize_options(self):
    pass

  def finalize_options(self):
    pass

  def run(self):
    # TODO(atash) ensure that we're running from the repository directory when
    # this command is used
    try:
      shutil.rmtree(PROTO_STEM)
    except Exception as error:
      # We don't care if this command fails
      pass
    shutil.copytree(GRPC_PROTO_STEM, PROTO_STEM)
    for root, _, _ in os.walk(PYTHON_PROTO_TOP_LEVEL):
      path = os.path.join(root, '__init__.py')
      open(path, 'a').close()


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

  description = 'build protobuf modules'
  user_options = [
    ('include=', None, 'path patterns to include in protobuf generation'),
    ('exclude=', None, 'path patterns to exclude from protobuf generation')
  ]

  def initialize_options(self):
    self.exclude = None
    self.include = r'.*\.proto$'

  def finalize_options(self):
    pass

  def run(self):
    import grpc.tools.protoc as protoc

    include_regex = re.compile(self.include)
    exclude_regex = re.compile(self.exclude) if self.exclude else None
    paths = []
    for walk_root, directories, filenames in os.walk(PROTO_STEM):
      for filename in filenames:
        path = os.path.join(walk_root, filename)
        if include_regex.match(path) and not (
            exclude_regex and exclude_regex.match(path)):
          paths.append(path)

    # TODO(kpayson): It would be nice to do this in a batch command,
    # but we currently have name conflicts in src/proto
    for path in paths:
      command = [
          'grpc.tools.protoc',
          '-I {}'.format(PROTO_STEM),
          '--python_out={}'.format(PROTO_STEM),
          '--grpc_python_out={}'.format(PROTO_STEM),
      ] + [path]
      if protoc.main(command) != 0:
        sys.stderr.write(
            'warning: Command:\n{}\nFailed'.format(
                command))

    # Generated proto directories dont include __init__.py, but
    # these are needed for python package resolution
    for walk_root, _, _ in os.walk(PROTO_STEM):
      path = os.path.join(walk_root, '__init__.py')
      open(path, 'a').close()


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

  def run(self):
    try:
      self.run_command('build_proto_modules')
    except CommandError as error:
      sys.stderr.write('warning: %s\n' % error.message)
    build_py.build_py.run(self)


class TestLite(setuptools.Command):
  """Command to run tests without fetching or building anything."""

  description = 'run tests without fetching or building anything.'
  user_options = []

  def initialize_options(self):
    pass

  def finalize_options(self):
    # distutils requires this override.
    pass

  def run(self):
    self._add_eggs_to_path()

    import tests
    loader = tests.Loader()
    loader.loadTestsFromNames(['tests'])
    runner = tests.Runner()
    result = runner.run(loader.suite)
    if not result.wasSuccessful():
      sys.exit('Test failure')

  def _add_eggs_to_path(self):
    """Fetch install and test requirements"""
    self.distribution.fetch_build_eggs(self.distribution.install_requires)
    self.distribution.fetch_build_eggs(self.distribution.tests_require)


class RunInterop(test.test):

  description = 'run interop test client/server'
  user_options = [
    ('args=', 'a', 'pass-thru arguments for the client/server'),
    ('client', 'c', 'flag indicating to run the client'),
    ('server', 's', 'flag indicating to run the server')
  ]

  def initialize_options(self):
    self.args = ''
    self.client = False
    self.server = False

  def finalize_options(self):
    if self.client and self.server:
      raise DistutilsOptionError('you may only specify one of client or server')

  def run(self):
    if self.distribution.install_requires:
      self.distribution.fetch_build_eggs(self.distribution.install_requires)
    if self.distribution.tests_require:
      self.distribution.fetch_build_eggs(self.distribution.tests_require)
    if self.client:
      self.run_client()
    elif self.server:
      self.run_server()

  def run_server(self):
    # We import here to ensure that our setuptools parent has had a chance to
    # edit the Python system path.
    from tests.interop import server
    sys.argv[1:] = self.args.split()
    server.serve()

  def run_client(self):
    # We import here to ensure that our setuptools parent has had a chance to
    # edit the Python system path.
    from tests.interop import client
    sys.argv[1:] = self.args.split()
    client.test_interoperability()