# -*- coding: utf-8 -*- #
# Copyright 2017 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.
"""gcloud dns policy update command."""

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

from googlecloudsdk.api_lib.dns import util
from googlecloudsdk.api_lib.util import apis
from googlecloudsdk.calliope import base
from googlecloudsdk.command_lib.dns import flags
from googlecloudsdk.command_lib.dns import resource_args
from googlecloudsdk.command_lib.dns import util as command_util
from googlecloudsdk.core import log


def _AddArgsCommon(parser):
  flags.GetPolicyDescriptionArg().AddToParser(parser)
  flags.GetPolicyNetworksArg().AddToParser(parser)
  flags.GetPolicyInboundForwardingArg().AddToParser(parser)
  flags.GetPolicyAltNameServersArg().AddToParser(parser)
  flags.GetPolicyLoggingArg().AddToParser(parser)
  flags.GetPolicyPrivateAltNameServersArg().AddToParser(parser)
  flags.GetEnableDns64AllQueriesArg(update=True).AddToParser(parser)


def _ArgsNeededForUpdateCommon():
  return (
      'networks',
      'description',
      'enable_inbound_forwarding',
      'enable_logging',
      'alternative_name_servers',
      'enable_dns64_all_queries',
  )


@base.UniverseCompatible
@base.ReleaseTracks(base.ReleaseTrack.GA)
class UpdateGA(base.UpdateCommand):
  """Update an existing Cloud DNS policy.

  Update an existing Cloud DNS policy.

  ## EXAMPLES

  To change the description of a policy, run:

    $ {command} mypolicy --description="Hello, world!"

  """

  def _FetchPolicy(self, policy_ref, api_version):
    """Get policy to be Updated."""
    client = util.GetApiClient(api_version)
    m = apis.GetMessagesModule('dns', api_version)
    get_request = m.DnsPoliciesGetRequest(
        policy=policy_ref.Name(), project=policy_ref.project)
    return client.policies.Get(get_request)

  @staticmethod
  def Args(parser):
    resource_args.AddPolicyResourceArg(
        parser, verb='to update', api_version='v1')
    _AddArgsCommon(parser)
    parser.display_info.AddFormat('json')

  def Run(self, args):
    api_version = util.GetApiFromTrack(self.ReleaseTrack())
    client = util.GetApiClient(api_version)
    messages = apis.GetMessagesModule('dns', api_version)

    # Get Policy
    policy_ref = args.CONCEPTS.policy.Parse()
    to_update = self._FetchPolicy(policy_ref, api_version)
    args_needed_for_update = _ArgsNeededForUpdateCommon()
    if not any(args.IsSpecified(arg) for arg in args_needed_for_update):
      log.status.Print('Nothing to update.')
      return to_update

    if args.IsSpecified('networks'):
      if args.networks == ['']:
        args.networks = []
      to_update.networks = command_util.ParsePolicyNetworks(
          args.networks, policy_ref.project, api_version)

    if args.IsSpecified('alternative_name_servers') or args.IsSpecified(
        'private_alternative_name_servers'):
      if args.alternative_name_servers == ['']:
        args.alternative_name_servers = []
      if args.private_alternative_name_servers == ['']:
        args.private_alternative_name_servers = []
      to_update.alternativeNameServerConfig = command_util.ParseAltNameServers(
          version=api_version,
          server_list=args.alternative_name_servers,
          private_server_list=args.private_alternative_name_servers)

    if args.IsSpecified('enable_inbound_forwarding'):
      to_update.enableInboundForwarding = args.enable_inbound_forwarding

    if args.IsSpecified('enable_logging'):
      to_update.enableLogging = args.enable_logging

    if args.IsSpecified('enable_dns64_all_queries'):
      to_update.dns64Config = messages.PolicyDns64Config(
          scope=messages.PolicyDns64ConfigScope(
              allQueries=args.enable_dns64_all_queries
          )
      )

    if args.IsSpecified('description'):
      to_update.description = args.description

    update_req = messages.DnsPoliciesUpdateRequest(
        policy=to_update.name,
        policyResource=to_update,
        project=policy_ref.project)

    updated_policy = client.policies.Update(update_req).policy

    log.UpdatedResource(updated_policy.name, kind='Policy')

    return updated_policy


@base.UniverseCompatible
@base.ReleaseTracks(base.ReleaseTrack.BETA)
class UpdateBeta(UpdateGA):
  """Update an existing Cloud DNS policy.

  Update an existing Cloud DNS policy.

  ## EXAMPLES

  To change the description of a policy, run:

    $ {command} mypolicy --description="Hello, world!"

  """

  @staticmethod
  def Args(parser):
    resource_args.AddPolicyResourceArg(
        parser, verb='to update', api_version='v1beta2')
    _AddArgsCommon(parser)
    parser.display_info.AddFormat('json')

  def Run(self, args):
    api_version = util.GetApiFromTrack(self.ReleaseTrack())
    client = util.GetApiClient(api_version)
    messages = apis.GetMessagesModule('dns', api_version)

    # Get Policy
    policy_ref = args.CONCEPTS.policy.Parse()
    to_update = self._FetchPolicy(policy_ref, api_version)
    args_needed_for_update = _ArgsNeededForUpdateCommon()
    if not any(args.IsSpecified(arg) for arg in args_needed_for_update):
      log.status.Print('Nothing to update.')
      return to_update

    if args.IsSpecified('networks'):
      if args.networks == ['']:
        args.networks = []
      to_update.networks = command_util.ParsePolicyNetworks(
          args.networks, policy_ref.project, api_version)

    if args.IsSpecified('alternative_name_servers') or args.IsSpecified(
        'private_alternative_name_servers'):
      if args.alternative_name_servers == ['']:
        args.alternative_name_servers = []
      if args.private_alternative_name_servers == ['']:
        args.private_alternative_name_servers = []
      to_update.alternativeNameServerConfig = command_util.ParseAltNameServers(
          version=api_version,
          server_list=args.alternative_name_servers,
          private_server_list=args.private_alternative_name_servers)

    if args.IsSpecified('enable_inbound_forwarding'):
      to_update.enableInboundForwarding = args.enable_inbound_forwarding
    if args.IsSpecified('enable_logging'):
      to_update.enableLogging = args.enable_logging
    if args.IsSpecified('enable_dns64_all_queries'):
      to_update.dns64Config = messages.PolicyDns64Config(
          scope=messages.PolicyDns64ConfigScope(
              allQueries=args.enable_dns64_all_queries
          )
      )

    if args.IsSpecified('description'):
      to_update.description = args.description

    update_req = messages.DnsPoliciesUpdateRequest(
        policy=to_update.name,
        policyResource=to_update,
        project=policy_ref.project)

    updated_policy = client.policies.Update(update_req).policy

    log.UpdatedResource(updated_policy.name, kind='Policy')

    return updated_policy


@base.UniverseCompatible
@base.ReleaseTracks(base.ReleaseTrack.ALPHA)
class UpdateAlpha(UpdateBeta):
  """Update an existing Cloud DNS policy.

  Update an existing Cloud DNS policy.

  ## EXAMPLES

  To change the description of a policy, run:

    $ {command} mypolicy --description="Hello, world!"

  """

  @staticmethod
  def Args(parser):
    resource_args.AddPolicyResourceArg(
        parser, verb='to update', api_version='v1alpha2')
    _AddArgsCommon(parser)
    parser.display_info.AddFormat('json')