# Copyright 2017 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,
# 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.
"""`gcloud tasks queues purge` command."""

from __future__ import absolute_import
from __future__ import unicode_literals
from googlecloudsdk.api_lib.tasks import queues
from googlecloudsdk.calliope import base
from googlecloudsdk.command_lib.tasks import flags
from googlecloudsdk.command_lib.tasks import parsers
from googlecloudsdk.core import log
from googlecloudsdk.core.console import console_io


@base.ReleaseTracks(base.ReleaseTrack.ALPHA)
class Purge(base.Command):
  """Purge a queue by deleting all of its tasks.

  This command purges a queue by deleting all of its tasks. Purge operations can
  take up to one minute to take effect. Tasks might be dispatched before the
  purge takes effect. A purge is irreversible. All tasks created before this
  command is run are permanently deleted.
  """

  @staticmethod
  def Args(parser):
    flags.AddQueueResourceArg(parser, 'to purge')
    flags.AddLocationFlag(parser)

  def Run(self, args):
    queues_client = queues.Queues()
    queue_ref = parsers.ParseQueue(args.queue, args.location)
    console_io.PromptContinue(
        cancel_on_no=True,
        prompt_string='Are you sure you want to purge: [{}]'.format(
            queue_ref.RelativeName()))
    queues_client.Purge(queue_ref)
    log.status.Print('Purged queue [{}].'.format(queue_ref.Name()))
