"""Base class for Python-coded activities

This is currently the only reference for what an 
activity must do to participate in the Sugar desktop.
"""
# 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 os

import gtk, gobject

from sugar.presence import presenceservice
from sugar.activity.activityservice import ActivityService
from sugar.graphics.window import Window
from sugar.graphics.toolbox import Toolbox
from sugar.graphics.toolbutton import ToolButton

class ActivityToolbar(gtk.Toolbar):
    __gsignals__ = {
        'share-clicked': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE, ([])),
        'close-clicked': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE, ([]))
    }

    def __init__(self, activity):
        gtk.Toolbar.__init__(self)

        self._activity = activity
        activity.connect('shared', self._activity_shared_cb)

        button = ToolButton('window-close')
        button.connect('clicked', self._close_button_clicked_cb)
        self.insert(button, -1)
        button.show()

        self._share_button = ToolButton('stock-share-mesh')
        self._share_button.connect('clicked', self._share_button_clicked_cb)
        self.insert(self._share_button, -1)
        if activity.get_shared():
            self._share_button.set_sensitive(False)
        self._share_button.show()
        
    def _close_button_clicked_cb(self, button):
        self.emit('close-clicked')

    def _share_button_clicked_cb(self, button):
        self.emit('share-clicked')

    def _activity_shared_cb(self, activity):
        self._share_button.set_sensitive(False)

class ActivityToolbox(Toolbox):
    def __init__(self, activity):
        Toolbox.__init__(self)
        
        self._activity_toolbar = ActivityToolbar(activity)
        self.add_toolbar('Activity', self._activity_toolbar)
        self._activity_toolbar.show()

    def get_activity_toolbar(self):
        return self._activity_toolbar

class Activity(Window, gtk.Container):
    """Base Activity class that all other Activities derive from."""
    __gtype_name__ = 'SugarActivity'

    __gsignals__ = {
        'shared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE, ([]))
    }

    def __init__(self, handle):
        """Initialise the Activity 
        
        handle -- sugar.activity.activityhandle.ActivityHandle
            instance providing the activity id and access to the 
            presence service which *may* provide sharing for this 
            application
        
        Side effects: 
        
            Sets the gdk screen DPI setting (resolution) to the 
            Sugar screen resolution.
            
            Connects our "destroy" message to our _destroy_cb
            method.
        
            Creates a base gtk.Window within this window.
            
            Creates an ActivityService (self._bus) servicing
            this application.
        """
        Window.__init__(self)

        self.connect('destroy', self._destroy_cb)

        self._shared = False
        self._activity_id = handle.activity_id
        self._pservice = presenceservice.get_instance()
        self._service = None
        self._share_sigid = None

        service = handle.get_presence_service()
        if service:
            self._join(service)

        self._bus = ActivityService(self)

    def get_service_name(self):
        """Gets the activity service name."""
        return os.environ['SUGAR_BUNDLE_SERVICE_NAME']

    def get_shared(self):
        """Returns TRUE if the activity is shared on the mesh."""
        return self._shared

    def get_id(self):
        """Get the unique activity identifier."""
        return self._activity_id

    def _join(self, service):
        """Join an existing instance of this activity on the network."""
        self._service = service
        self._shared = True
        self._service.join()
        self.present()
        self.emit('shared')

    def _share_cb(self, ps, success, service, err):
        self._pservice.disconnect(self._share_sigid)
        self._share_sigid = None
        if success:
            logging.debug('Share of activity %s successful.' % self.get_id())
            self._service = service
            self._shared = True
            self.emit('shared')
        else:
            logging.debug('Share of activity %s failed: %s.' % (self.get_id(), err))

    def share(self):
        """Request that the activity be shared on the network."""
        logging.debug('Requesting share of activity %s.' % self.get_id())
        self._share_sigid = self._pservice.connect("activity-shared", self._share_cb)
        self._pservice.share_activity(self)

    def execute(self, command, args):
        """Execute the given command with args"""
        return False

    def _destroy_cb(self, window):
        """Destroys our ActivityService and sharing service"""
        if self._bus:
            del self._bus
            self._bus = None
        if self._service:
            self._pservice.unregister_service(self._service)

    def _handle_close_cb(self, toolbar):
        self.destroy()

    def _handle_share_cb(self, toolbar):
        self.share()

    def set_toolbox(self, toolbox):
        Window.set_toolbox(self, toolbox)
        act_toolbar = toolbox.get_activity_toolbar()
        act_toolbar.connect('share-clicked', self._handle_share_cb)
        act_toolbar.connect('close-clicked', self._handle_close_cb)

def get_bundle_path():
    """Return the bundle path for the current process' bundle
    """
    return os.environ['SUGAR_BUNDLE_PATH']