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

# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# Copyright 2011 OpenStack LLC.
# 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.

"""
Glance Management Utility
"""

# FIXME(sirp): When we have glance-admin we can consider merging this into it
# Perhaps for consistency with Nova, we would then rename glance-admin ->
# glance-manage (or the other way around)

import optparse
import os
import sys

# If ../glance/__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, 'glance', '__init__.py')):
    sys.path.insert(0, possible_topdir)

from glance import version as glance_version
from glance.common import config
from glance.common import exception
import glance.registry.db
import glance.registry.db.migration


def create_options(parser):
    """
    Sets up the CLI and config-file options that may be
    parsed and program commands.

    :param parser: The option parser
    """
    config.add_common_options(parser)
    config.add_log_options(parser)
    glance.registry.db.add_options(parser)


def do_db_version(options, args):
    """Print database's current migration level"""
    print glance.registry.db.migration.db_version(options)


def do_upgrade(options, args):
    """Upgrade the database's migration level"""
    try:
        db_version = args[1]
    except IndexError:
        db_version = None

    glance.registry.db.migration.upgrade(options, version=db_version)


def do_downgrade(options, args):
    """Downgrade the database's migration level"""
    try:
        db_version = args[1]
    except IndexError:
        raise exception.MissingArgumentError(
            "downgrade requires a version argument")

    glance.registry.db.migration.downgrade(options, version=db_version)


def do_version_control(options, args):
    """Place a database under migration control"""
    glance.registry.db.migration.version_control(options)


def do_db_sync(options, args):
    """Place a database under migration control and upgrade"""
    try:
        db_version = args[1]
    except IndexError:
        db_version = None
    glance.registry.db.migration.db_sync(options, version=db_version)


def dispatch_cmd(options, args):
    """Search for do_* cmd in this module and then run it"""
    cmd = args[0]
    try:
        cmd_func = globals()['do_%s' % cmd]
    except KeyError:
        sys.exit("ERROR: unrecognized command '%s'" % cmd)

    try:
        cmd_func(options, args)
    except exception.Error, e:
        sys.exit("ERROR: %s" % e)


def main():
    version = '%%prog %s' % glance_version.version_string()
    usage = "%prog [options] <cmd>"
    oparser = optparse.OptionParser(usage, version=version)
    create_options(oparser)
    (options, args) = config.parse_options(oparser)

    try:
        # We load the glance-registry config section because
        # sql_connection is only part of the glance registry.
        conf_file, conf = config.load_paste_config('glance-registry',
                                                   options, args)
        config.setup_logging(options, conf)
    except RuntimeError, e:
        sys.exit("ERROR: %s" % e)

    if not args:
        oparser.print_usage()
        sys.exit(1)

    if conf.get('sql_connection') and not options['sql_connection']:
        options['sql_connection'] = conf.get('sql_connection')

    dispatch_cmd(options, args)


if __name__ == '__main__':
    main()
