# Copyright 2013 OpenStack Foundation
#
# 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.

import sqlalchemy as sql

from keystone.common.sql import migration_helpers


def upgrade(migrate_engine):
    # Upgrade operations go here. Don't create your own engine; bind
    # migrate_engine to your metadata
    meta = sql.MetaData()
    meta.bind = migrate_engine

    consumer_table = sql.Table('consumer', meta, autoload=True)
    request_token_table = sql.Table('request_token', meta, autoload=True)
    access_token_table = sql.Table('access_token', meta, autoload=True)

    constraints = [{'table': request_token_table,
                    'fk_column': 'consumer_id',
                    'ref_column': consumer_table.c.id},
                   {'table': access_token_table,
                    'fk_column': 'consumer_id',
                    'ref_column': consumer_table.c.id}]
    if meta.bind != 'sqlite':
        migration_helpers.add_constraints(constraints)


def downgrade(migrate_engine):
    meta = sql.MetaData()
    meta.bind = migrate_engine
    consumer_table = sql.Table('consumer', meta, autoload=True)
    request_token_table = sql.Table('request_token', meta, autoload=True)
    access_token_table = sql.Table('access_token', meta, autoload=True)

    constraints = [{'table': request_token_table,
                    'fk_column': 'consumer_id',
                    'ref_column': consumer_table.c.id},
                   {'table': access_token_table,
                    'fk_column': 'consumer_id',
                    'ref_column': consumer_table.c.id}]
    if migrate_engine.name != 'sqlite':
        migration_helpers.remove_constraints(constraints)