#!/usr/bin/env python

# Copyright (C) 2006-2008, Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

import os
import sys
import gettext
from optparse import OptionParser

import dbus
import dbus.service
import dbus.glib

from sugar3.activity import activityhandle
from sugar3.bundle.activitybundle import ActivityBundle
from sugar3 import logger


def create_activity_instance(constructor, handle):
    activity = constructor(handle)
    activity.show()
    return activity


def get_single_process_name(bundle_id):
    return bundle_id


def get_single_process_path(bundle_id):
    return '/' + bundle_id.replace('.', '/')


class SingleProcess(dbus.service.Object):

    def __init__(self, name_service, constructor):
        self.constructor = constructor

        bus = dbus.SessionBus()
        bus_name = dbus.service.BusName(name_service, bus=bus)
        object_path = get_single_process_path(name_service)
        dbus.service.Object.__init__(self, bus_name, object_path)

    @dbus.service.method('org.laptop.SingleProcess', in_signature='a{sv}')
    def create(self, handle_dict):
        handle = activityhandle.create_from_dict(handle_dict)
        create_activity_instance(self.constructor, handle)

def main():
    parser = OptionParser()
    parser.add_option('-b', '--bundle-id', dest='bundle_id',
                      help='identifier of the activity bundle')
    parser.add_option('-a', '--activity-id', dest='activity_id',
                      help='identifier of the activity instance')
    parser.add_option('-o', '--object-id', dest='object_id',
                      help='identifier of the associated datastore object')
    parser.add_option('-u', '--uri', dest='uri',
                      help='URI to load')
    parser.add_option('-s', '--single-process', dest='single_process',
                      action='store_true',
                      help='start all the instances in the same process')
    parser.add_option('-i', '--invited', dest='invited',
                      action='store_true', default=False,
                      help='the activity is being launched for handling an '
                           'invite from the network')
    (options, args) = parser.parse_args()

    logger.start()

    if 'SUGAR_BUNDLE_PATH' not in os.environ:
        print 'SUGAR_BUNDLE_PATH is not defined in the environment.'
        sys.exit(1)

    if len(args) == 0:
        print 'A python class must be specified as first argument.'
        sys.exit(1)

    bundle_path = os.environ['SUGAR_BUNDLE_PATH']
    sys.path.append(bundle_path)

    bundle = ActivityBundle(bundle_path)

    os.environ['SUGAR_BUNDLE_ID'] = bundle.get_bundle_id()
    os.environ['SUGAR_BUNDLE_NAME'] = bundle.get_name()
    os.environ['SUGAR_BUNDLE_VERSION'] = str(bundle.get_activity_version())

    splitted_module = args[0].rsplit('.', 1)
    module_name = splitted_module[0]
    class_name = splitted_module[1]

    module = __import__(module_name)
    for comp in module_name.split('.')[1:]:
        module = getattr(module, comp)

    activity_constructor = getattr(module, class_name)
    activity_handle = activityhandle.ActivityHandle(
            activity_id=options.activity_id,
            object_id=options.object_id, uri=options.uri,
            invited=options.invited)

    if options.single_process is True:
        sessionbus = dbus.SessionBus()

        service_name = get_single_process_name(options.bundle_id)
        service_path = get_single_process_path(options.bundle_id)

        bus_object = sessionbus.get_object(
                'org.freedesktop.DBus', '/org/freedesktop/DBus')
        try:
            name = bus_object.GetNameOwner(
                    service_name, dbus_interface='org.freedesktop.DBus')
        except  dbus.DBusException:
            name = None

        if not name:
            SingleProcess(service_name, activity_constructor)
        else:
            single_process = sessionbus.get_object(service_name, service_path)
            single_process.create(activity_handle.get_dict(),
                                  dbus_interface='org.laptop.SingleProcess')

            print 'Created %s in a single process.' % service_name
            sys.exit(0)

    if hasattr(module, 'start'):
        module.start()

    instance = create_activity_instance(activity_constructor, activity_handle)

    if hasattr(instance, 'run_main_loop'):
        instance.run_main_loop()

main()