# Copyright (C) 2006, Owen Williams.
#
# 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 logging

import gobject
import wnck

from model.homeactivity import HomeActivity
from sugar.activity import Activity

class HomeModel(gobject.GObject):

    __gsignals__ = {
        'activity-launched':       (gobject.SIGNAL_RUN_FIRST,
                                    gobject.TYPE_NONE, 
                                   ([gobject.TYPE_PYOBJECT])),
        'activity-added':          (gobject.SIGNAL_RUN_FIRST,
                                    gobject.TYPE_NONE, 
                                   ([gobject.TYPE_PYOBJECT])),
        'activity-removed':        (gobject.SIGNAL_RUN_FIRST,
                                    gobject.TYPE_NONE,
                                   ([gobject.TYPE_PYOBJECT])),
        'active-activity-changed': (gobject.SIGNAL_RUN_FIRST,
                                    gobject.TYPE_NONE,
                                   ([gobject.TYPE_PYOBJECT]))
    }
    
    def __init__(self, bundle_registry):
        gobject.GObject.__init__(self)

        self._activities = {}
        self._bundle_registry = bundle_registry
        self._current_activity = None

        screen = wnck.screen_get_default()
        screen.connect('window-opened', self._window_opened_cb)
        screen.connect('window-closed', self._window_closed_cb)
        screen.connect('active-window-changed',
                       self._active_window_changed_cb)

    def get_current_activity(self):
        return self._current_activity

    def __iter__(self): 
        return iter(self._activities)
        
    def __len__(self):
        return len(self._activities)
        
    def __getitem__(self, i):
        return self._activities[i]

    def _window_opened_cb(self, screen, window):
        if window.get_window_type() == wnck.WINDOW_NORMAL:
            self._add_activity(window)

    def _window_closed_cb(self, screen, window):
        if window.get_window_type() == wnck.WINDOW_NORMAL:
            self._remove_activity(window.get_xid())
        if not self._activities:
            self.emit('active-activity-changed', None)

    def _get_activity_by_xid(self, xid):
        for act in self._activities.values():
            if act.get_xid() == xid:
                return act
        return None

    def _active_window_changed_cb(self, screen):
        window = screen.get_active_window()
        if window == None:
            self.emit('active-activity-changed', None)
            return
        if window.get_window_type() != wnck.WINDOW_NORMAL:
            return

        xid = window.get_xid()
        act = self._get_activity_by_xid(window.get_xid())
        if act:
            if act.get_launched() == True:
                self._current_activity = act
            else:
                self._current_activity = None
                logging.error('Actiivty for window %d was not yet launched.' % xid)
        else:
            self._current_activity = None
            logging.error('Model for window %d does not exist.' % xid)

        self.emit('active-activity-changed', self._current_activity)
        
    def _add_activity(self, window):
        act_service = Activity.get_service(window.get_xid())
        act_id = act_service.get_id()

        activity = None
        if self._activities.has_key(act_id):
            activity = self._activities[act_id]
        else:
            # activity got lost, took longer to launch than we allow,
            # or it was launched by something other than the shell
            act_type = act_service.get_type()
            bundle = self._bundle_registry.get_bundle(act_type)
            if not bundle:
                raise RuntimeError("No bundle for activity type '%s'." % act_type)
                return
            activity = HomeActivity(bundle, act_id)
            self._activities[act_id] = activity

        activity.set_window(window)
        self.emit('activity-added', activity)

    def _internal_remove_activity(self, activity):
        self.emit('activity-removed', activity)
        act_id = activity.get_id()
        del self._activities[act_id]
        
    def _remove_activity(self, xid):
        activity = self._get_activity_by_xid(xid)
        if activity:
            self._internal_remove_activity(activity)
        else:
            logging.error('Model for window %d does not exist.' % xid)

    def _activity_launch_timeout_cb(self, activity):
        act_id = activity.get_id()
        if not act_id in self._activities.keys():
            return
        self._internal_remove_activity(activity)

    def notify_activity_launch(self, activity_id, service_name):
        bundle = self._bundle_registry.get_bundle(service_name)
        if not bundle:
            raise ValueError("Activity service name '%s' was not found in the bundle registry." % service_name)
        activity = HomeActivity(bundle, activity_id)
        activity.connect('launch-timeout', self._activity_launch_timeout_cb)
        self._activities[activity_id] = activity
        self.emit('activity-launched', activity)

    def notify_activity_launch_failed(self, activity_id):
        if self._activities.has_key(activity_id):
            activity = self._activities[activity_id]
            logging.debug("Activity %s (%s) launch failed" % (activity_id, activity.get_type()))
            self._internal_remove_activity(activity)
        else:
            logging.error('Model for activity id %s does not exist.' % activity_id)