# -*- coding: utf-8 -*- #
# Copyright 2014 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.
"""Delete cluster command."""

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

from apitools.base.py import exceptions as apitools_exceptions

from googlecloudsdk.api_lib.container import kubeconfig as kconfig
from googlecloudsdk.api_lib.container import util
from googlecloudsdk.calliope import base
from googlecloudsdk.calliope import exceptions
from googlecloudsdk.command_lib.container import flags
from googlecloudsdk.core import log
from googlecloudsdk.core import properties
from googlecloudsdk.core.console import console_io
import six


@base.DefaultUniverseOnly
class Delete(base.DeleteCommand):
  """Delete an existing cluster for running containers.

  When you delete a cluster, the following resources are deleted:

  - The control plane resources
  - All of the node instances in the cluster
  - Any Pods that are running on those instances
  - Any firewalls and routes created by Kubernetes Engine at the time of cluster
    creation
  - Data stored in host hostPath and emptyDir volumes

  GKE will attempt to delete the following resources. Deletion of these
  resources is not always guaranteed:

  - External load balancers created by the cluster
  - Internal load balancers created by the cluster
  - Persistent disk volumes
  """

  detailed_help = {
      'DESCRIPTION':
          '{description}',
      'EXAMPLES':
          """\
          To delete an existing cluster, run:

            $ {command} sample-cluster
          """,
  }

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

    Args:
      parser: An argparse.ArgumentParser-like object. It is mocked out in order
        to capture some information, but behaves like an ArgumentParser.
    """
    parser.add_argument(
        'names',
        metavar='NAME',
        nargs='+',
        help='The names of the clusters to delete.')
    parser.add_argument(
        '--timeout',
        type=int,
        default=3600,
        hidden=True,
        help='Timeout (seconds) for waiting on the operation to complete.')
    flags.AddAsyncFlag(parser)
    flags.AddKubecontextOverrideFlag(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.

    Returns:
      Some value that we want to have printed later.
    """
    adapter = self.context['api_adapter']
    location_get = self.context['location_get']
    location = location_get(args)
    cluster_refs = []
    for name in args.names:
      cluster_refs.append(adapter.ParseCluster(name, location))
    console_io.PromptContinue(
        message=util.ConstructList('The following clusters will be deleted.', [
            '[{name}] in [{zone}]'.format(
                name=ref.clusterId, zone=adapter.Zone(ref))
            for ref in cluster_refs
        ]),
        throw_if_unattended=True,
        cancel_on_no=True)

    operations = []
    errors = []
    # Issue all deletes first
    for cluster_ref in cluster_refs:
      try:
        op_ref = adapter.DeleteCluster(cluster_ref)
        operations.append((op_ref, cluster_ref))
      except apitools_exceptions.HttpError as error:
        errors.append(
            six.text_type(
                exceptions.HttpException(error, util.HTTP_ERROR_FORMAT)))
      except util.Error as error:
        errors.append(error)
    if not args.async_:
      # Poll each operation for completion
      for operation_ref, cluster_ref in operations:
        try:
          adapter.WaitForOperation(
              operation_ref,
              'Deleting cluster {0}'.format(cluster_ref.clusterId),
              timeout_s=args.timeout)
          # Purge cached config files
          try:
            util.ClusterConfig.Purge(
                cluster_ref.clusterId,
                adapter.Zone(cluster_ref),
                cluster_ref.projectId,
                args.kubecontext_override,
            )
          except kconfig.MissingEnvVarError as error:
            log.warning(error)

          if properties.VALUES.container.cluster.Get() == cluster_ref.clusterId:
            properties.PersistProperty(properties.VALUES.container.cluster,
                                       None)
          log.DeletedResource(cluster_ref)
        except apitools_exceptions.HttpError as error:
          errors.append(exceptions.HttpException(error, util.HTTP_ERROR_FORMAT))
        except util.Error as error:
          errors.append(error)

    if errors:
      raise util.Error(
          util.ConstructList('Some requests did not succeed:', errors))