# -*- coding: utf-8 -*- #
# Copyright 2016 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.
"""Cloud Pub/Sub subscriptions seek command."""

from __future__ import absolute_import
from __future__ import division
from __future__ import unicode_literals

from googlecloudsdk.api_lib.pubsub import subscriptions

from googlecloudsdk.calliope import base
from googlecloudsdk.command_lib.pubsub import flags
from googlecloudsdk.command_lib.pubsub import resource_args
from googlecloudsdk.command_lib.pubsub import util


def _Run(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.

  Returns:
    A serialized object (dict) describing the results of the operation.  This
    description fits the Resource described in the ResourceRegistry under
    'pubsub.subscriptions.seek'.
  """
  client = subscriptions.SubscriptionsClient()

  subscription_ref = args.CONCEPTS.subscription.Parse()
  result = {'subscriptionId': subscription_ref.RelativeName()}

  snapshot_ref = None
  time = None
  if args.snapshot:
    snapshot_ref = util.ParseSnapshot(args.snapshot, args.snapshot_project)
    result['snapshotId'] = snapshot_ref.RelativeName()
  else:
    time = util.FormatSeekTime(args.time)
    result['time'] = time

  client.Seek(subscription_ref, time=time, snapshot_ref=snapshot_ref)

  return result


@base.DefaultUniverseOnly
class Seek(base.Command):
  """Resets a subscription's backlog to a point in time or to a given snapshot."""

  @staticmethod
  def Args(parser):
    resource_args.AddSubscriptionResourceArg(parser, 'to affect.')
    flags.AddSeekFlags(parser)

  def Run(self, args):
    return _Run(args)