# -*- coding: utf-8 -*- #
# Copyright 2023 Google LLC. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Implementation of managed-folders set-iam-policy command."""


import collections

from googlecloudsdk.api_lib.storage import api_factory
from googlecloudsdk.api_lib.storage.gcs_json import metadata_field_converters
from googlecloudsdk.calliope import base
from googlecloudsdk.command_lib.iam import iam_util
from googlecloudsdk.command_lib.storage import errors_util
from googlecloudsdk.command_lib.storage import flags
from googlecloudsdk.command_lib.storage import folder_util
from googlecloudsdk.command_lib.storage import iam_command_util
from googlecloudsdk.command_lib.storage import name_expansion
from googlecloudsdk.command_lib.storage import storage_url
from googlecloudsdk.command_lib.storage import wildcard_iterator
from googlecloudsdk.command_lib.storage.tasks import set_iam_policy_task
from googlecloudsdk.core import log


def _set_iam_policy_task_iterator(url_strings, policy):
  """Generates SetIamPolicyTask's for execution."""
  url_found_match_tracker = collections.OrderedDict()
  for name_expansion_result in name_expansion.NameExpansionIterator(
      url_strings,
      managed_folder_setting=folder_util.ManagedFolderSetting.LIST_WITHOUT_OBJECTS,
      raise_error_for_unmatched_urls=False,
      url_found_match_tracker=url_found_match_tracker,
  ):
    yield set_iam_policy_task.SetManagedFolderIamPolicyTask(
        name_expansion_result.resource.storage_url,
        policy,
    )

  for url_string, found_match in url_found_match_tracker.items():
    if found_match:
      continue
    if wildcard_iterator.contains_wildcard(url_string):
      log.warning(
          'Not creating managed folder for URL containing wildcard that did not'
          ' match any managed folders: '
          + url_string
      )
      continue
    url = storage_url.storage_url_from_string(url_string)
    api_factory.get_api(url.scheme).create_managed_folder(
        url.bucket_name, url.resource_name
    )
    yield set_iam_policy_task.SetManagedFolderIamPolicyTask(url, policy)


@base.UniverseCompatible
class SetIamPolicy(base.Command):
  """Set the IAM policy for a managed folder."""

  detailed_help = {
      'DESCRIPTION': """
      Set the IAM policy for a managed folder. For more information, see [Cloud
      Identity and Access
      Management](https://cloud.google.com/storage/docs/access-control/iam).
      """,
      'EXAMPLES': """
      To set the IAM policy in POLICY-FILE on a managed folder `managed-folder` in a bucket `bucket`:

        $ {command} gs://bucket/managed-folder POLICY-FILE
      """,
  }

  @staticmethod
  def Args(parser):
    parser.add_argument(
        'urls',
        nargs='+',
        help='URLs for managed folders to apply the IAM policy to.',
    )
    parser.add_argument(
        '-e',
        '--etag',
        help=(
            'Custom etag to set on IAM policy. API will reject etags that do'
            ' not match this value, making it useful as a precondition during'
            ' concurrent operations.'
        ),
    )
    iam_util.AddArgForPolicyFile(parser)
    flags.add_continue_on_error_flag(parser)

  def Run(self, args):
    for url_string in args.urls:
      url = storage_url.storage_url_from_string(url_string)
      errors_util.raise_error_if_not_gcs_folder_type(args.command_path, url)
    policy = metadata_field_converters.process_iam_file(
        args.policy_file, custom_etag=args.etag
    )
    exit_code, output = iam_command_util.execute_set_iam_task_iterator(
        _set_iam_policy_task_iterator(args.urls, policy), args.continue_on_error
    )

    self.exit_code = exit_code
    return output
