# -*- encoding: utf-8 -*-
#
# Copyright 2013 Hewlett-Packard Development Company, L.P.
# 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.

"""
Run storage database migration.
"""

import sys

from oslo.config import cfg

from cerberus.db import migration
from cerberus import service


CONF = cfg.CONF


class DBCommand(object):

    def upgrade(self):
        migration.upgrade(CONF.command.revision)

    def downgrade(self):
        migration.downgrade(CONF.command.revision)

    def revision(self):
        migration.revision(CONF.command.message, CONF.command.autogenerate)

    def stamp(self):
        migration.stamp(CONF.command.revision)

    def version(self):
        print(migration.version())

    def create_schema(self):
        migration.create_schema()


def add_command_parsers(subparsers):
    command_object = DBCommand()

    parser = subparsers.add_parser('upgrade',
            help="Upgrade the database schema to the latest version. "
                 "Optionally, use --revision to specify an alembic revision "
                 "string to upgrade to.")
    parser.set_defaults(func=command_object.upgrade)
    parser.add_argument('--revision', nargs='?')

    parser = subparsers.add_parser('downgrade',
            help="Downgrade the database schema to the oldest revision. "
                 "While optional, one should generally use --revision to "
                 "specify the alembic revision string to downgrade to.")
    parser.set_defaults(func=command_object.downgrade)
    parser.add_argument('--revision', nargs='?')

    parser = subparsers.add_parser('stamp')
    parser.add_argument('--revision', nargs='?')
    parser.set_defaults(func=command_object.stamp)

    parser = subparsers.add_parser('revision',
            help="Create a new alembic revision. "
                 "Use --message to set the message string.")
    parser.add_argument('-m', '--message')
    parser.add_argument('--autogenerate', action='store_true')
    parser.set_defaults(func=command_object.revision)

    parser = subparsers.add_parser('version',
            help="Print the current version information and exit.")
    parser.set_defaults(func=command_object.version)

    parser = subparsers.add_parser('create_schema',
            help="Create the database schema.")
    parser.set_defaults(func=command_object.create_schema)


command_opt = cfg.SubCommandOpt('command',
                                title='Command',
                                help='Available commands',
                                handler=add_command_parsers)

CONF.register_cli_opt(command_opt)


def main():
    # this is hack to work with previous usage of ironic-dbsync
    # pls change it to ironic-dbsync upgrade
    valid_commands = set([
        'upgrade', 'downgrade', 'revision',
        'version', 'stamp', 'create_schema',
    ])
    if not set(sys.argv) & valid_commands:
        sys.argv.append('upgrade')

    service.prepare_service(sys.argv)
    CONF.command.func()