from __future__ import print_function, division, absolute_import

# Copyright (c) 2016 Red Hat, Inc.
#
# This software is licensed to you under the GNU General Public License,
# version 2 (GPLv2). There is NO WARRANTY for this software, express or
# implied, including the implied warranties of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. You should have received a copy of GPLv2
# along with this software; if not, see
# http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
#
# Red Hat trademarks are not licensed under GPLv2. No permission is
# granted to use or replicate Red Hat trademarks that are incorporated
# in this software or its documentation.
import sys
import optparse
import dbus
import dbus.mainloop.glib
import rhsmlib
import logging

from rhsmlib.dbus import server

log = logging.getLogger(__name__)


def load_bus_class(option, opt_str, value, parser):
    """OptionParser callback method to load a class from a string"""
    clazz = rhsmlib.import_class(value)
    parser.values.bus = clazz


def parse_argv(argv, default_dbus_name):
    parser = optparse.OptionParser(usage="usage: %prog [options] [class name]")
    parser.add_option("-b", "--bus",
        action="callback", callback=load_bus_class,
        type="string", default=dbus.SystemBus,
        help="Bus to use (defaults to dbus.SystemBus)")
    parser.add_option("-n", "--bus-name", default=default_dbus_name)
    parser.add_option("-v", "--verbose", action="store_true")
    (opts, args) = parser.parse_args(argv[1:])
    return opts, args


def main(argv=sys.argv, object_classes=None, default_bus_name=None):
    # Set default mainloop
    dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)

    if not default_bus_name:
        default_bus_name = rhsmlib.dbus.constants.BUS_NAME

    options, args = parse_argv(argv, default_bus_name)

    if options.verbose:
        logger = logging.getLogger('')
        logger.setLevel(logging.DEBUG)

    if not object_classes:
        # Read the object classes from the command-line if we don't
        # get anything as a parameter
        object_classes = []
        for clazz in args:
            object_classes.append(rhsmlib.import_class(clazz))

    try:
        log.debug('Starting DBus service with name %s' % options.bus_name)
        server.Server(
            bus_class=options.bus,
            bus_name=options.bus_name,
            object_classes=object_classes).run()
    except dbus.exceptions.DBusException as e:
        if e._dbus_error_name == "org.freedesktop.DBus.Error.AccessDenied":
            print("Access to DBus denied.  You need to edit /etc/dbus-1/system.conf to allow %s or run with "
                  "dbus-daemon and a custom config file." % options.bus_name)
    return 0