# Copyright 2011 OpenStack 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.

from sqlalchemy import *
from migrate import *

from nova import log as logging
from nova import utils

meta = MetaData()
LOG = logging.getLogger(__name__)


# instance info cache table to add to DB
instance_info_caches = Table('instance_info_caches', meta,
        Column('created_at', DateTime(timezone=False),
               default=utils.utcnow()),
        Column('updated_at', DateTime(timezone=False),
               onupdate=utils.utcnow()),
        Column('deleted_at', DateTime(timezone=False)),
        Column('deleted', Boolean(create_constraint=True, name=None)),
        Column('id', Integer(), primary_key=True),
        Column('network_info', Text()),
        Column('instance_id', String(36),
               ForeignKey('instances.uuid'),
               nullable=False,
               unique=True),
        mysql_engine='InnoDB')


def upgrade(migrate_engine):
    meta.bind = migrate_engine

    # load instances for fk
    instances = Table('instances', meta, autoload=True)

    # create instance_info_caches table
    try:
        instance_info_caches.create()
    except Exception:
        LOG.error(_("Table |%s| not created!"), repr(instance_info_caches))
        raise


def downgrade(migrate_engine):
    try:
        instance_info_caches.drop()
    except Exception:
        LOG.error(_("instance_info_caches tables not dropped"))
        raise
