# Copyright 2015 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.
"""Command for recreating instances managed by a managed instance group."""

from __future__ import absolute_import
from __future__ import unicode_literals
from googlecloudsdk.api_lib.compute import base_classes
from googlecloudsdk.api_lib.compute import instance_groups_utils
from googlecloudsdk.calliope import arg_parsers
from googlecloudsdk.calliope import base
from googlecloudsdk.command_lib.compute import flags
from googlecloudsdk.command_lib.compute import scope as compute_scope
from googlecloudsdk.command_lib.compute.instance_groups import flags as instance_groups_flags


def _AddArgs(parser):
  """Adds args."""
  parser.add_argument(
      '--instances',
      type=arg_parsers.ArgList(min_length=1),
      metavar='INSTANCE',
      required=True,
      help='Names of instances to recreate.')


class RecreateInstances(base.Command):
  """Recreate instances managed by a managed instance group."""

  @staticmethod
  def Args(parser):
    parser.display_info.AddFormat("""
        table(project(),
              zone(),
              selfLink.basename():label=INSTANCE,
              status)""")
    _AddArgs(parser=parser)
    instance_groups_flags.MULTISCOPE_INSTANCE_GROUP_MANAGER_ARG.AddArgument(
        parser)

  def Run(self, args):
    holder = base_classes.ComputeApiHolder(self.ReleaseTrack())
    client = holder.client

    resource_arg = instance_groups_flags.MULTISCOPE_INSTANCE_GROUP_MANAGER_ARG
    default_scope = compute_scope.ScopeEnum.ZONE
    scope_lister = flags.GetDefaultScopeLister(client)
    igm_ref = resource_arg.ResolveAsResource(
        args,
        holder.resources,
        default_scope=default_scope,
        scope_lister=scope_lister)
    instances = instance_groups_utils.CreateInstanceReferences(
        holder.resources, client, igm_ref, args.instances)

    if igm_ref.Collection() == 'compute.instanceGroupManagers':
      field_name = 'instanceGroupManagersRecreateInstancesRequest'
      service = client.apitools_client.instanceGroupManagers
      requests = instance_groups_utils.SplitInstancesInRequest(
          client.messages.ComputeInstanceGroupManagersRecreateInstancesRequest(
              instanceGroupManager=igm_ref.Name(),
              instanceGroupManagersRecreateInstancesRequest=
              client.messages.InstanceGroupManagersRecreateInstancesRequest(
                  instances=instances),
              project=igm_ref.project,
              zone=igm_ref.zone), field_name)
    else:
      field_name = 'regionInstanceGroupManagersRecreateRequest'
      service = client.apitools_client.regionInstanceGroupManagers
      requests = instance_groups_utils.SplitInstancesInRequest(
          client.messages.
          ComputeRegionInstanceGroupManagersRecreateInstancesRequest(
              instanceGroupManager=igm_ref.Name(),
              regionInstanceGroupManagersRecreateRequest=
              client.messages.RegionInstanceGroupManagersRecreateRequest(
                  instances=instances),
              project=igm_ref.project,
              region=igm_ref.region,), field_name)

    requests = instance_groups_utils.GenerateRequestTuples(
        service, 'RecreateInstances', requests)

    return instance_groups_utils.MakeRequestsList(client, requests, field_name)


RecreateInstances.detailed_help = {
    'brief': 'Recreate instances managed by a managed instance group.',
    'DESCRIPTION': """
        *{command}* is used to recreate one or more instances in a managed
instance group. The underlying virtual machine instances are deleted and
recreated based on the latest instance template configured for the managed
instance group.
""",
}
