# -*- 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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"""Command to restart migration jobs for a database migration."""

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

from googlecloudsdk.api_lib.database_migration import api_util
from googlecloudsdk.api_lib.database_migration import migration_jobs
from googlecloudsdk.api_lib.database_migration import resource_args
from googlecloudsdk.calliope import base
from googlecloudsdk.core import log

DETAILED_HELP = {
    'DESCRIPTION': """
        Fetch objects for a Database Migration Service migration job by connection to the source.
        """,
    'EXAMPLES': """\
        To fetch source objects for a migration job:

          $ {command} MIGRATION_JOB --region=us-central1
        """,
}


class _MigrationJobObjectInfo:
  """Container for migration job object data using in list display."""

  def __init__(self, message):
    self.name = message.name
    self.source_object = message.sourceObject
    self.error = message.error if message.error is not None else None
    self.state = message.state
    self.phase = message.phase
    self.create_time = message.createTime
    self.update_time = message.updateTime


@base.DefaultUniverseOnly
@base.ReleaseTracks(base.ReleaseTrack.GA)
class FetchSourceObjects(base.Command):
  """Fetch objects for a Database Migration Service migration job by connection to the source."""

  @staticmethod
  def Args(parser):
    """Args is called by calliope to gather arguments for this command.

    Args:
      parser: An argparse parser that you can use to add arguments that go on
        the command line after this command. Positional arguments are allowed.
    """
    resource_args.AddOnlyMigrationJobResourceArgs(parser, 'to restart')
    parser.display_info.AddFormat("""
            table(
              source_object,
              state:label=STATE,
              phase:label=PHASE,
              error:label=ERROR
            )
          """)

  def Run(self, args):
    """Fetch source objects for a Database Migration Service migration job.

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

    Returns:
      A dict object representing the operations resource describing the restart
      operation if the restart was successful.
    """
    migration_job_ref = args.CONCEPTS.migration_job.Parse()

    mj_client = migration_jobs.MigrationJobsClient(self.ReleaseTrack())
    result_operation = mj_client.FetchSourceObjects(
        migration_job_ref.RelativeName(),
    )

    client = api_util.GetClientInstance(self.ReleaseTrack())

    log.status.Print(
        'Waiting for migration job [{}] to fetch source objects with [{}]'
        .format(migration_job_ref.migrationJobsId, result_operation.name)
    )

    api_util.HandleLRO(
        client,
        result_operation,
        client.projects_locations_migrationJobs,
        no_resource=True,
    )

    log.status.Print(
        'Fetched source objects for migration job {} [{}]'.format(
            migration_job_ref.migrationJobsId, result_operation.name
        )
    )

    obj = mj_client.ListObjects(migration_job_ref)

    return [_MigrationJobObjectInfo(o) for o in obj]