# Copyright 2016 Google Inc. 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,
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"""Cloud Pub/Sub snapshots create command."""

from __future__ import absolute_import
from __future__ import unicode_literals

from apitools.base.py import exceptions as api_ex

from googlecloudsdk.api_lib.pubsub import snapshots
from googlecloudsdk.api_lib.util import exceptions
from googlecloudsdk.calliope import base
from googlecloudsdk.command_lib.pubsub import util
from googlecloudsdk.command_lib.util.args import labels_util
from googlecloudsdk.core import log


@base.ReleaseTracks(base.ReleaseTrack.ALPHA)
class Create(base.CreateCommand):
  """This feature is part of an invite-only release of the Cloud Pub/Sub API.

  Creates one or more Cloud Pub/Sub snapshots.
  This feature is part of an invitation-only release of the underlying
  Cloud Pub/Sub API. The command will generate errors unless you have access to
  this API. This restriction should be relaxed in the near future. Please
  contact cloud-pubsub@google.com with any questions in the meantime.
  """

  @staticmethod
  def Args(parser):
    """Registers flags for this command."""

    parser.add_argument('snapshot', nargs='+',
                        help='One or more snapshot names to create.')

    parser.add_argument(
        '--subscription', required=True,
        help=('The subscription whose backlog the snapshot retains. '
              ' Specifically, the created snapshot is guaranteed to retain a)'
              ' The existing backlog on the subscription, i.e., the set of'
              ' messages in the subscription that are unacknowledged upon the'
              ' successful completion of the create snapshot request, b) Any'
              ' messages published to the subscription\'s topic following the'
              ' successful creation of the snapshot.'))

    parser.add_argument(
        '--subscription-project', default='',
        help=('The name of the project the provided subscription belongs to.'
              ' If not set, it defaults to the currently selected'
              ' cloud project.'))

    labels_util.AddCreateLabelsFlags(parser)

  def Run(self, args):
    """This is what gets called when the user runs this command.

    Args:
      args: an argparse namespace. All the arguments that were provided to this
        command invocation.

    Yields:
      A serialized object (dict) describing the results of the operation.
      This description fits the Resource described in the ResourceRegistry under
      'pubsub.projects.snapshots'.

    Raises:
      util.RequestFailedError: if any of the requests to the API failed.
    """
    client = snapshots.SnapshotsClient()

    subscription_ref = util.ParseSubscription(
        args.subscription, args.subscription_project)

    labels = labels_util.ParseCreateArgs(
        args, client.messages.CreateSnapshotRequest.LabelsValue)

    failed = []
    for snapshot_name in args.snapshot:
      snapshot_ref = util.ParseSnapshot(snapshot_name)

      try:
        result = client.Create(snapshot_ref, subscription_ref, labels=labels)
      except api_ex.HttpError as error:
        exc = exceptions.HttpException(error)
        log.CreatedResource(snapshot_ref.RelativeName(), kind='snapshot',
                            failed=exc.payload.status_message)
        failed.append(snapshot_name)
        continue

      result = util.SnapshotDisplayDict(result)
      log.CreatedResource(snapshot_ref.RelativeName(), kind='snapshot')
      yield result

    if failed:
      raise util.RequestsFailedError(failed, 'create')
