# -*- coding: utf-8 -*- #
# Copyright 2023 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.
"""Command to trigger a database failover."""


from googlecloudsdk.api_lib.composer import environments_util as environments_api_util
from googlecloudsdk.api_lib.composer import operations_util as operations_api_util
from googlecloudsdk.api_lib.composer import util as api_util
from googlecloudsdk.calliope import base
from googlecloudsdk.command_lib.composer import resource_args
from googlecloudsdk.command_lib.composer import util as command_util
from googlecloudsdk.core import log

DETAILED_HELP = {
    'EXAMPLES': """\
      To run a manual database failover on the environment named ``environment-1'', run:
      $ {command} environment-1
    """
}


class DatabaseFailover(base.Command):
  """Run a database failover operation."""

  detailed_help = DETAILED_HELP

  @staticmethod
  def Args(parser):
    resource_args.AddEnvironmentResourceArg(
        parser, 'for which to trigger a database failover'
    )
    base.ASYNC_FLAG.AddToParser(parser)

  @staticmethod
  def _ValidateEnvironment(env_obj, release_track):
    messages = api_util.GetMessagesModule(release_track=release_track)
    if (
        env_obj.config.resilienceMode is None
        or env_obj.config.resilienceMode
        == messages.EnvironmentConfig.ResilienceModeValueValuesEnum.RESILIENCE_MODE_UNSPECIFIED
    ):
      raise command_util.InvalidUserInputError(
          'Cannot trigger a database failover'
          ' for environments without enabled high resilience mode.'
      )

  def Run(self, args):
    env_ref = args.CONCEPTS.environment.Parse()
    release_track = self.ReleaseTrack()
    env_obj = environments_api_util.Get(env_ref, release_track=release_track)
    self._ValidateEnvironment(env_obj, release_track)

    operation = environments_api_util.DatabaseFailover(
        env_ref, release_track=release_track
    )
    if args.async_:
      return self._AsynchronousExecution(env_ref, operation)
    else:
      return self._SynchronousExecution(env_ref, operation)

  def _AsynchronousExecution(self, env_resource, operation):
    details = 'with operation [{0}]'.format(operation.name)
    log.UpdatedResource(
        env_resource.RelativeName(),
        kind='environment',
        is_async=True,
        details=details,
    )
    return operation

  def _SynchronousExecution(self, env_resource, operation):
    try:
      operations_api_util.WaitForOperation(
          operation,
          'Waiting for [{}] to be updated with [{}]'.format(
              env_resource.RelativeName(), operation.name
          ),
          release_track=self.ReleaseTrack(),
      )
    except command_util.Error as e:
      raise command_util.Error(
          'Error triggerering a database failover [{}]: {}'.format(
              env_resource.RelativeName(), str(e)
          )
      )
