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

# 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.

import gettext
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 config
from reddwarf.common import utils
from reddwarf.db import db_api


def create_options(parser):
    """Sets up the CLI and config-file options.

    :param parser: The option parser
    :returns: None
    """
    parser.add_option('-p', '--port', dest="port", metavar="PORT",
        type=int, default=9898,
        help="Port the Reddwarf API host listens on. "
             "Default: %default")
    config.add_common_options(parser)
    config.add_log_options(parser)


class Commands(object):

    def __init__(self, conf):
        self.conf = conf

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

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

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

    def execute(self, command_name, *args):
        if self.has(command_name):
            return getattr(self, command_name)(*args)

    _commands = ['db_sync', 'db_upgrade', 'db_downgrade']

    @classmethod
    def has(cls, command_name):
        return (command_name in cls._commands)

    @classmethod
    def all(cls):
        return cls._commands

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


def usage():
    usage = """
%prog action [args] [options]

Available actions:

    """
    for action in Commands.all():
        usage = usage + ("\t%s\n" % action)
    return usage.strip()


if __name__ == '__main__':
    oparser = optparse.OptionParser(version="%%prog %s"
    % version.version_string(),
        usage=usage())
    create_options(oparser)
    (options, args) = config.parse_options(oparser)

    if len(args) < 1 or not Commands.has(args[0]):
        oparser.print_usage()
        sys.exit(2)

    try:
        conf = config.Config.load_paste_config('reddwarf', options, args)
        config.setup_logging(options, conf)

        command_name = args.pop(0)
        Commands(conf).execute(command_name, *args)
        sys.exit(0)
    except TypeError:
        print _("Possible wrong number of arguments supplied")
        command_params = Commands(conf).params_of(command_name)
        print "Usage: reddwarf-manage %s" % command_params
        sys.exit(2)
    except Exception:
        print _("Command failed, please check log for more info")
        raise