# -*- coding: utf-8 -*- #
# Copyright 2024 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
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"""Roll back to the previous server certificate for a Cloud SQL instance."""

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

from googlecloudsdk.api_lib.sql import api_util
from googlecloudsdk.api_lib.sql import exceptions
from googlecloudsdk.api_lib.sql import operations
from googlecloudsdk.api_lib.sql import validate
from googlecloudsdk.api_lib.sql.ssl import server_certs
from googlecloudsdk.calliope import base
from googlecloudsdk.command_lib.sql import flags
from googlecloudsdk.core import properties


class _BaseRollbackCert(object):
  """Base class for sql server_certs rollback."""

  @staticmethod
  def Args(parser):
    """Declare flag and positional arguments for the command parser."""
    base.ASYNC_FLAG.AddToParser(parser)
    flags.AddInstance(parser)
    parser.display_info.AddFormat(flags.SERVER_CERTS_FORMAT)

  def Run(self, args):
    """Roll back to the previous server certificate for a Cloud SQL instance.

    Args:
      args: argparse.Namespace, The arguments that this command was invoked
        with.

    Returns:
      The Server Cert that was rolled back to, if the operation was
      successful.
    """

    client = api_util.SqlClient(api_util.API_VERSION_DEFAULT)
    sql_client = client.sql_client
    sql_messages = client.sql_messages

    validate.ValidateInstanceName(args.instance)
    instance_ref = client.resource_parser.Parse(
        args.instance,
        params={'project': properties.VALUES.core.project.GetOrFail},
        collection='sql.instances')

    previous_server_cert = server_certs.GetPreviousServerCertificate(
        sql_client, sql_messages, instance_ref
    )

    if not previous_server_cert:
      raise exceptions.ResourceNotFoundError(
          'No previous Server Certificate exists.'
      )

    result_operation = sql_client.instances.RotateServerCertificate(
        sql_messages.SqlInstancesRotateServerCertificateRequest(
            project=instance_ref.project,
            instance=instance_ref.instance,
            instancesRotateServerCertificateRequest=sql_messages.InstancesRotateServerCertificateRequest(
                rotateServerCertificateContext=sql_messages.RotateServerCertificateContext(
                    nextVersion=previous_server_cert.sha1Fingerprint
                )
            ),
        )
    )

    operation_ref = client.resource_parser.Create(
        'sql.operations',
        operation=result_operation.name,
        project=instance_ref.project)

    operations.OperationsV1Beta4.WaitForOperation(
        sql_client, operation_ref, 'Rolling back to previous Server Certificate'
    )

    # The previous cert is now active after the rollback.
    return flags.ServerCertForPrint(
        previous_server_cert, server_certs.ACTIVE_CERT_LABEL
    )


@base.ReleaseTracks(
    base.ReleaseTrack.GA, base.ReleaseTrack.BETA, base.ReleaseTrack.ALPHA
)
@base.DefaultUniverseOnly
class RollbackCert(_BaseRollbackCert, base.CreateCommand):
  """Roll back to the previous server certificate for a Cloud SQL instance."""
  pass