#!/usr/bin/env python
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# modification, are permitted provided that the following conditions are
# met:
#
#     * Redistributions of source code must retain the above copyright
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

import argparse
import os
import os.path
import shutil
import subprocess
import tempfile

parser = argparse.ArgumentParser()
parser.add_argument('--config', metavar='c', type=str, nargs=1,
                    help='GRPC/GPR libraries build configuration',
                    default='opt')
parser.add_argument('--submit', action='store_true')
parser.add_argument('--gh-user', type=str, help='GitHub user to push as.')
parser.add_argument('--gh-repo-owner', type=str,
                    help=('Owner of the GitHub repository to be pushed; '
                          'defaults to --gh-user.'))
parser.add_argument('--doc-branch', type=str)
args = parser.parse_args()

SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
PROJECT_ROOT = os.path.abspath(os.path.join(SCRIPT_DIR, '..', '..', '..'))

CONFIG = args.config
SETUP_PATH = os.path.join(PROJECT_ROOT, 'src/python/grpcio/setup.py')
DOC_PATH = os.path.join(PROJECT_ROOT, 'src/python/grpcio/doc/build')
INCLUDE_PATH = os.path.join(PROJECT_ROOT, 'include')
LIBRARY_PATH = os.path.join(PROJECT_ROOT, 'libs/{}'.format(CONFIG))
VIRTUALENV_DIR = os.path.join(SCRIPT_DIR, 'distrib_virtualenv')
VIRTUALENV_PYTHON_PATH = os.path.join(VIRTUALENV_DIR, 'bin', 'python')

environment = os.environ.copy()
environment.update({
    'CONFIG': CONFIG,
    'CFLAGS': '-I{}'.format(INCLUDE_PATH),
    'LDFLAGS': '-L{}'.format(LIBRARY_PATH),
    'LD_LIBRARY_PATH': LIBRARY_PATH
})

subprocess_arguments_list = [
    {'args': ['make'], 'cwd': PROJECT_ROOT},
    {'args': ['virtualenv', VIRTUALENV_DIR], 'env': environment},
    {'args': [VIRTUALENV_PYTHON_PATH, SETUP_PATH, 'build'], 'env': environment},
    {'args': [VIRTUALENV_PYTHON_PATH, SETUP_PATH, 'doc'], 'env': environment},
]

for subprocess_arguments in subprocess_arguments_list:
  subprocess.check_call(**subprocess_arguments)

if args.submit:
  assert args.gh_user
  assert args.doc_branch
  github_user = args.gh_user
  github_repository_owner = (
      args.gh_repo_owner if args.gh_repo_owner else args.gh_user)
  # Create a temporary directory out of tree, checkout gh-pages from the
  # specified repository, edit it, and push it. It's up to the user to then go
  # onto GitHub and make a PR against grpc/grpc:gh-pages.
  repo_parent_dir = tempfile.mkdtemp()
  repo_dir = os.path.join(repo_parent_dir, 'grpc')
  python_doc_dir = os.path.join(repo_dir, 'python')
  doc_branch = args.doc_branch

  subprocess.check_call([
          'git', 'clone', 'https://{}@github.com/{}/grpc'.format(
              github_user, github_repository_owner)
      ], cwd=repo_parent_dir)
  subprocess.check_call([
          'git', 'remote', 'add', 'upstream', 'https://github.com/grpc/grpc'
      ], cwd=repo_dir)
  subprocess.check_call(['git', 'fetch', 'upstream'], cwd=repo_dir)
  subprocess.check_call([
          'git', 'checkout', 'upstream/gh-pages', '-b', doc_branch
      ], cwd=repo_dir)
  shutil.rmtree(python_doc_dir, ignore_errors=True)
  shutil.copytree(DOC_PATH, python_doc_dir)
  subprocess.check_call(['git', 'add', '--all'], cwd=repo_dir)
  subprocess.check_call([
          'git', 'commit', '-m', 'Auto-update Python documentation'
      ], cwd=repo_dir)
  subprocess.check_call([
          'git', 'push', '--set-upstream', 'origin', doc_branch
      ], cwd=repo_dir)
  shutil.rmtree(repo_parent_dir)