# Copyright (C) 2006, Red Hat, Inc.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.

import logging

import dbus
import gobject
import gtk

from sugar.presence import PresenceService
from sugar.activity import bundleregistry
from sugar.activity.activityhandle import ActivityHandle
from sugar import util

_ACTIVITY_SERVICE_NAME = "org.laptop.Activity"
_ACTIVITY_SERVICE_PATH = "/org/laptop/Activity"
_ACTIVITY_INTERFACE = "org.laptop.Activity"

def create_activity_id():
    pservice = PresenceService.get_instance()

    # create a new unique activity ID
    i = 0
    act_id = None
    while i < 10:
        act_id = util.unique_id()
        i += 1

        # check through network activities
        found = False
        activities = pservice.get_activities()
        for act in activities:
            if act_id == act.get_id():
                found = True
                break
        if found:
            raise RuntimeError("Cannot generate unique activity id.")

    return act_id

class ActivityCreationHandler(gobject.GObject):
    __gsignals__ = {
        'success': (gobject.SIGNAL_RUN_FIRST,
                    gobject.TYPE_NONE, ([])),
        'error':   (gobject.SIGNAL_RUN_FIRST,
                    gobject.TYPE_NONE, 
                   ([gobject.TYPE_PYOBJECT]))
    }

    def __init__(self, service_name, activity_handle):
        gobject.GObject.__init__(self)
        self._service_name = service_name
        self._activity_handle = activity_handle

        registry = bundleregistry.get_registry()
        bundle = registry.get_bundle(service_name)

        bus = dbus.SessionBus()
        proxy_obj = bus.get_object(service_name, bundle.get_object_path(), follow_name_owner_changes=True)
        factory = dbus.Interface(proxy_obj, "com.redhat.Sugar.ActivityFactory")

        factory.create(self._activity_handle.get_dict(),
                       reply_handler=self._reply_handler,
                       error_handler=self._error_handler)

    def get_activity_id(self):
        return self._activity_handle.activity_id

    def _reply_handler(self, xid):
        logging.debug("Activity created %s (%s)." % 
            (self._activity_handle.activity_id, self._service_name))
        self.emit('success')

    def _error_handler(self, err):
        logging.debug("Couldn't create activity %s (%s): %s" %
            (self._activity_handle.activity_id, self._service_name, err))
        self.emit('error', err)

def create(service_name, activity_handle=None):
    """Create a new activity from its name."""
    if not activity_handle:
        activity_handle = ActivityHandle(create_activity_id())
    return ActivityCreationHandler(service_name, activity_handle)

def create_with_uri(service_name, uri):
    """Create a new activity and pass the uri as handle."""
    activity_handle = ActivityHandle(create_activity_id())
    activity_handle.uri = uri
    return ActivityCreationHandler(service_name, activity_handle)

def create_with_object_id(service_name, object_id):
    """Create a new activity and pass the object id as handle."""
    activity_handle = ActivityHandle(create_activity_id())
    activity_handle.object_id = object_id
    return ActivityCreationHandler(service_name, activity_handle)