# -*- coding: utf-8 -*- #
# Copyright 2016 Google Inc. 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 for spanner rows update."""

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

from googlecloudsdk.api_lib.spanner import database_sessions
from googlecloudsdk.api_lib.spanner import databases
from googlecloudsdk.calliope import arg_parsers
from googlecloudsdk.calliope import base
from googlecloudsdk.command_lib.spanner import resource_args
from googlecloudsdk.command_lib.spanner import write_util
from googlecloudsdk.core import resources


class Update(base.Command):
  # pylint:disable=line-too-long
  """Update a row in a Cloud Spanner database.

  ## EXAMPLES

  To update a row with SingerId=1,SingName=abc in table Singers under
  my-database and my-instance, run:

    $ {command} --table=Singers --database=my-database --instance=my-instance --data=SingerId=1,SingerName=abc

    $ {command} --table=Singers --database=my-database --instance=my-instance --flags-file=path/to/file.yaml
  """

  @staticmethod
  def Args(parser):
    """See base class."""

    resource_args.AddDatabaseResourceArg(parser, 'in which to update a row',
                                         False)
    parser.add_argument(
        '--table',
        required=True,
        type=str,
        help='The Cloud Spanner table name.')
    parser.add_argument(
        '--data',
        required=True,
        metavar='COLUMN_NAME=VALUE',
        type=arg_parsers.ArgDict(),
        help='The column names and values for the row being updated. '
        'For complicated input values, such as arrays, use the `--flags-file` '
        'flag. See $ gcloud topic flags-file for more information.')

  def Run(self, args):
    """This is what gets called when the user runs this command."""

    database_ref = args.CONCEPTS.database.Parse()
    # DDL(Data Definition Language) is needed to get the schema of the current
    # database and table so that we know the type of each column (e.g. INT64)
    # user wants to delete.
    ddl = databases.GetDdl(database_ref)
    table = write_util.Table.FromDdl(ddl, args.table)
    data = write_util.ValidateArrayInput(table, args.data)

    mutation = database_sessions.MutationFactory.Update(table, data)

    # To commit a transaction in a session, we need to create one and delete it
    # at the end.
    session_name = database_sessions.Create(database_ref)
    session = resources.REGISTRY.ParseRelativeName(
        relative_name=session_name.name,
        collection='spanner.projects.instances.databases.sessions')
    try:
      return database_sessions.Commit(session, [mutation])
    finally:
      database_sessions.Delete(session)
