#!/usr/bin/env python
# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright 2011 OpenStack Foundation
# 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.

import gettext
import inspect
import optparse
import os
import sys


gettext.install('reddwarf', unicode=1)


# If ../reddwarf/__init__.py exists, add ../ to Python search path, so that
# it will override what happens to be installed in /usr/(local/)lib/python...
possible_topdir = os.path.normpath(os.path.join(os.path.abspath(sys.argv[0]),
    os.pardir,
    os.pardir))
if os.path.exists(os.path.join(possible_topdir, 'reddwarf', '__init__.py')):
    sys.path.insert(0, possible_topdir)

from reddwarf import version
from reddwarf.common import cfg
from reddwarf.common import utils
from reddwarf.db import get_db_api
from reddwarf.openstack.common import log as logging
from reddwarf.openstack.common import uuidutils
from reddwarf.instance import models as instance_models


CONF = cfg.CONF


class Commands(object):

    def __init__(self):
        self.db_api = get_db_api()

    def db_sync(self, repo_path=None):
        self.db_api.db_sync(CONF, repo_path=repo_path)

    def db_upgrade(self, version=None, repo_path=None):
        self.db_api.db_upgrade(CONF, version, repo_path=None)

    def db_downgrade(self, version, repo_path=None):
        self.db_api.db_downgrade(CONF, version, repo_path=None)

    def execute(self):
        exec_method = getattr(self, CONF.action.name)
        args = inspect.getargspec(exec_method)
        args.args.remove('self')
        kwargs = {}
        for arg in args.args:
            kwargs[arg] = getattr(CONF.action, arg)
        exec_method(**kwargs)

    def image_update(self, service_name, image_id):
        self.db_api.configure_db(CONF)
        image = self.db_api.find_by(instance_models.ServiceImage,
                               service_name=service_name)
        if image is None:
            # Create a new one
            image = instance_models.ServiceImage()
            image.id = uuidutils.generate_uuid()
            image.service_name = service_name
        image.image_id = image_id
        self.db_api.save(image)

    def db_wipe(self, repo_path, service_name, image_id):
        """Drops the database and recreates it."""
        from reddwarf.instance import models
        from reddwarf.db.sqlalchemy import session
        self.db_api.drop_db(CONF)
        self.db_sync()
        # Sets up database engine, so the next line will work...
        session.configure_db(CONF)
        models.ServiceImage.create(service_name=service_name,
                                   image_id=image_id)

    def params_of(self, command_name):
        if Commands.has(command_name):
            return utils.MethodInspector(getattr(self, command_name))


if __name__ == '__main__':

    def actions(subparser):
        parser = subparser.add_parser('db_sync')
        parser.add_argument('--repo_path')
        parser = subparser.add_parser('db_upgrade')
        parser.add_argument('--version')
        parser.add_argument('--repo_path')
        parser = subparser.add_parser('db_downgrade')
        parser.add_argument('version')
        parser.add_argument('--repo_path')
        parser = subparser.add_parser('image_update')
        parser.add_argument('service_name')
        parser.add_argument('image_id')
        parser = subparser.add_parser('db_wipe')
        parser.add_argument('repo_path')
        parser.add_argument('service_name')
        parser.add_argument('image_id')

    cfg.custom_parser('action', actions)
    cfg.parse_args(sys.argv)

    try:
        logging.setup(None)
        
        Commands().execute()
        sys.exit(0)
    except TypeError as e:
        print _("Possible wrong number of arguments supplied %s" % e)
        sys.exit(2)
    except Exception:
        print _("Command failed, please check log for more info")
        raise