# -*- 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.
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"""Command for spanner database change quorum."""

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

import textwrap

from googlecloudsdk.api_lib.spanner import databases
from googlecloudsdk.api_lib.util import apis
from googlecloudsdk.calliope import base
from googlecloudsdk.command_lib.spanner import resource_args


@base.DefaultUniverseOnly
@base.ReleaseTracks(
    base.ReleaseTrack.ALPHA, base.ReleaseTrack.BETA, base.ReleaseTrack.GA
)
class ChangeQuorum(base.Command):
  """Change quorum of a Cloud Spanner database."""

  detailed_help = {
      'EXAMPLES': textwrap.dedent("""\
        To trigger change quorum from single-region mode to dual-region mode, run:

          $ {command} my-database-id --instance=my-instance-id --dual-region

        To trigger change quorum from dual-region mode to single-region mode with serving location as `asia-south1`, run:

          $ {command} my-database-id --instance=my-instance-id --single-region --serving-location=asia-south1

        To trigger change quorum using etag specified, run:

          $ {command} my-database-id --instance=my-instance-id --dual-region --etag=ETAG
        """),
  }

  @staticmethod
  def Args(parser):
    """See base class."""
    resource_args.AddDatabaseResourceArg(parser, 'to change quorum')
    dual_region_or_single_region = parser.add_mutually_exclusive_group(
        required=True
    )
    dual_region_flags = dual_region_or_single_region.add_argument_group(
        'Command-line flag for dual-region quorum change:'
    )
    dual_region_flags.add_argument(
        '--dual-region',
        required=True,
        action='store_true',
        help='Switch to dual-region quorum type.',
    )
    single_region_flags = dual_region_or_single_region.add_argument_group(
        'Command-line flags for single-region quorum change:'
    )
    single_region_flags.add_argument(
        '--single-region',
        required=True,
        action='store_true',
        help='Switch to single-region quorum type.',
    )
    single_region_flags.add_argument(
        '--serving-location',
        required=True,
        help='The cloud Spanner location.',
    )
    parser.add_argument(
        '--etag', help='Used for optimistic concurrency control.'
    )

  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.
    """
    msgs = apis.GetMessagesModule('spanner', 'v1')

    if args.dual_region:
      quorum_type = msgs.QuorumType(dualRegion=msgs.DualRegionQuorum())
    else:
      quorum_type = msgs.QuorumType(
          singleRegion=msgs.SingleRegionQuorum(
              servingLocation=args.serving_location
          )
      )
    return databases.ChangeQuorum(
        args.CONCEPTS.database.Parse(), quorum_type, args.etag
    )