#!/usr/bin/env python3
# Copyright 2020 The ChromiumOS Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Wrapper around bb invocation of the cl_factory recipe."""

import argparse
import json
import re
import subprocess
import sys

from shlex import quote


def Main(args):  # pylint: disable=invalid-name
  """Wrapper around `bb add` invocation to invoke cl_factory.

  Friendlier wrapper around the `bb add` command to aid invoking the cl_factory
  recipe. A typical invocation would look like the following:

  cl_factory \
    --cl https://chrome-internal-review.googlesource.com/c/chromeos/program/galaxy/+/3095418 \
    --regex src/program src/project \
    --reviewers reviewer1@chromium.org reviewer2@google.com \
    --ccs cc1@google.com \
    --hashtag regen-audio-configs \
    --replace_strings *.star foo bar \
    --message "Hello world

BUG=chromium:1092954
TEST=CQ"

  Note that by default the command is only printed out but not ran. To run the
  command and cause the invocation of the cl_factory recipe additionally pass:

  --nodryrun

  Also note that you likely to want to provide a "hashtag". This will allow
  gerrit cli commands to accurately target the generated CLs for batch review,
  verify, and commit. These commands are output in the "summarize results" step
  of the ClFactory recipe.

  For more information on arguments, such as the variables available for
  interpolation in the CL message, see:

  http://cs/chromeos_public/infra/recipes/recipes/cl_factory.proto

  Args:
    args: Namespace object holding parsed args.
  """
  cmd = ['bb', 'add']

  for cl in args.cl or []:
    cmd.extend(['-cl', cl])

  cmd.extend(csv_param('repo_regexes', args.regex))
  cmd.extend(csv_param('reviewers', args.reviewers))
  cmd.extend(csv_param('ccs', args.ccs))
  cmd.extend(csv_param('hashtags', args.hashtag))

  if args.set_source_depends:
    cmd.extend(['-p', 'set_source_depends=true'])

  replace_strings = list(map(lambda rs: replace_strings_dict(rs),
                             args.replace_strings or []))
  if replace_strings:
    cmd.extend(
        ['-p', '\'replace_strings={}\''.format(json.dumps(replace_strings))])

  if args.manifest_branch:
    cmd.extend(['-p', '\'manifest_branch={}\''.format(args.manifest_branch)])

  cmd.extend(['-p', quote('message_template={}'.format(args.message))])
  cmd.append('chromeos/infra/ClFactory')

  cmd = ' '.join(cmd)

  print('Command:')
  print(cmd)
  print('\n')

  if args.dryrun:
    print('Dry run only. Command not executed. Pass:')
    print('  --nodryrun')
    print('to invoke the recipe.')
  else:
    print('Executing command.')
    subprocess.run(cmd, shell=True, check=True)


def csv_param(name, values):
  if not values:
    return []
  values = ', '.join(map(lambda v: '"{}"'.format(v), values))
  return ['-p', '\'{}=[{}]\''.format(name, values)]


def replace_strings_dict(rs):
  return {
      'file_glob': rs[0],
      'before': rs[1],
      'after': rs[2],
  }


def validate_regex(value):
  try:
    re.compile(value)
    return value
  except:
    raise argparse.ArgumentTypeError('Invalid regex "{}"'.format(value))


def main():
  """Main program which parses args and runs Main."""
  parser = argparse.ArgumentParser(description=__doc__)
  parser.add_argument(
      '--cl',
      nargs='+',
      type=str,
      required=False,
      help='CL URL(s) input to patch into the projects.')
  parser.add_argument(
      '--regex',
      nargs='+',
      type=validate_regex,
      required=True,
      help='Operate on projects matching the regex or '
      'wildcard. Usage as in `repo forall`.')
  parser.add_argument(
      '--reviewers',
      nargs='+',
      type=str,
      required=True,
      help='Reviewers to add to the generated CLs.')
  parser.add_argument(
      '--ccs',
      nargs='+',
      type=str,
      required=False,
      help='CCs to add to the generated CLs.')
  parser.add_argument(
      '--hashtag',
      nargs='+',
      type=str,
      default=[],
      help='Hashtags to add to the generated CLs.')
  parser.add_argument(
      '--replace_strings',
      action='append',
      nargs=3,
      metavar=('glob', 'before', 'after'),
      help='String replacements to perform on the generated CLs.')
  parser.add_argument(
      '--message',
      type=str,
      required=True,
      help='Message template for the generated CLs.')
  parser.add_argument(
      '--set_source_depends',
      type=bool,
      required=False,
      default=False,
      help='Whether to set Cq-Depends on the input CLs to the list '
      'of generated CLs.')
  parser.add_argument(
      '--nodryrun',
      dest='dryrun',
      default=True,
      action='store_false')
  parser.add_argument(
      '--manifest_branch',
      type=str,
      required=False,
      help='Manifest branch to checkout and upload changes for. '
      'If not specified, ToT is used.')
  args = parser.parse_args()
  Main(args)


if __name__ == '__main__':
  sys.exit(main())