# Copyright 2017 Huawei Technologies Co.,LTD.
# 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 cyborg.common import service
from cyborg.common.i18n import _
from cyborg.conf import CONF
from cyborg.db import migration


class DBCommand:
    def upgrade(self):
        migration.upgrade(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(
        'revision',
        help=_(
            "Create a new alembic revision. "
            "Use --message to set the message string."
        ),
    )
    parser.set_defaults(func=command_object.revision)
    parser.add_argument('-m', '--message')
    parser.add_argument('--autogenerate', action='store_true')

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

    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)


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

    CONF.register_cli_opt(command_opt)

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