# Copyright 2012 Hewlett-Packard Development Company, L.P.
# All Rights Reserved.
#
# Author: Patrick Galbraith <patg@hp.com>
#
# 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 MetaData, Table
from migrate import ForeignKeyConstraint

meta = MetaData()


def upgrade(migrate_engine):
    meta.bind = migrate_engine
    dialect = migrate_engine.url.get_dialect().name

    records = Table('records', meta, autoload=True)
    domains = Table('domains', meta, autoload=True)

    # add foreignkey if not sqlite
    if not dialect.startswith('sqlite'):
        if dialect.startswith('mysql'):
            ForeignKeyConstraint(columns=[records.c.domain_id],
                                 refcolumns=[domains.c.id],
                                 name='records_ibfk_1').drop()
        else:
            ForeignKeyConstraint(columns=[records.c.domain_id],
                                 refcolumns=[domains.c.id]).drop()

        ForeignKeyConstraint(columns=[records.c.domain_id],
                             refcolumns=[domains.c.id],
                             ondelete='CASCADE',
                             name='fkey_records_domain_id').create()


def downgrade(migrate_engine):
    meta.bind = migrate_engine
    dialect = migrate_engine.url.get_dialect().name

    records = Table('records', meta, autoload=True)
    domains = Table('domains', meta, autoload=True)

    # add foreignkey if not sqlite
    if not dialect.startswith('sqlite'):
        ForeignKeyConstraint(columns=[records.c.domain_id],
                             refcolumns=[domains.c.id]).drop()
        ForeignKeyConstraint(columns=[records.c.domain_id],
                             refcolumns=[domains.c.id]).create()
