# Copyright (C) 2009, Aleksey Lim
#
# 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

"""Extend sugar-toolkit activity class"""

from gi.repository import Gtk
import logging
import telepathy
from gi.repository import GObject
from gi.repository import Gdk

from sugar3.activity import activity
from sugar3.presence.sugartubeconn import SugarTubeConnection
from sugar3.graphics.alert import ConfirmationAlert, NotifyAlert


_NEW_INSTANCE   = 0
_NEW_INSTANCE   = 1
_PRE_INSTANCE   = 2
_POST_INSTANCE  = 3


class CursorFactory:

    __shared_state = {"cursors": {}}

    def __init__(self):
        self.__dict__ = self.__shared_state

    def get_cursor(self, cur_type):
        if not self.cursors.has_key(cur_type):
            cur = Gdk.Cursor.new(cur_type)
            self.cursors[cur_type] = cur
        return self.cursors[cur_type]


class Activity(activity.Activity):

    """Basic activity class"""

    def new_instance(self):
        """
        New instance was created.

        Will be invoked after __init__() instead of resume_instance().
        Subclass should implement this method to catch creation stage.
        """
        pass

    def resume_instance(self, filepath):
        """
        Instance was resumed.

        Will be invoked after __init__() instead of new_instance().
        Subclass should implement this method to catch resuming stage.

        """
        pass

    def save_instance(self, filepath):
        """
        Save activity instance.

        Subclass should implement this method to save activity data.
        """
        raise NotImplementedError

    def on_save_instance(self, cb, *args):
        """ Register callback which will be invoked before save_instance """
        self.__on_save_instance.append((cb, args))
    """
    def share_instance(self, connection, is_initiator):
        
        Activity was shared/joined.

        connection -- SugarTubeConnection object
            wich represents telepathy connection

        is_initiator -- boolean
            if True activity was shared and
            (current activity is an initiator of sharing)
            otherwise activity was joined(to existed sharing session)

        Will be invoked after __init__() and {new,resume}_instance().
        Subclass should implement this method to catch sharing stage.
        
        pass
    """
    def set_toolbar_box(self, toolbox):
        if hasattr(activity.Activity, 'set_toolbar_box'):
            activity.Activity.set_toolbar_box(self, toolbox)
        else:
            self.set_toolbar_box(toolbox)

    def get_toolbar_box(self):
        if hasattr(activity.Activity, 'get_toolbar_box'):
            return activity.Activity.get_toolbar_box(self)
        else:
            return self.get_toolbox()

    toolbar_box = property(get_toolbar_box, set_toolbar_box)
    """
    def get_shared_activity(self):
        if hasattr(activity.Activity, 'get_shared_activity'):
            return activity.Activity.get_shared_activity(self)
        else:
            return self._shared_activity
    """
    def notify_alert(self, title, msg):
        """Raise standard notify alert"""
        alert = NotifyAlert(title=title, msg=msg)

        def response(alert, response_id, self):
            self.remove_alert(alert)

        alert.connect('response', response, self)
        alert.show_all()
        self.add_alert(alert)

    def confirmation_alert(self, title, msg, cb, *cb_args):
        """Raise standard confirmation alert"""
        alert = ConfirmationAlert(title=title, msg=msg)

        def response(alert, response_id, self, cb, *cb_args):
            self.remove_alert(alert)
            if response_id is Gtk.ResponseType.OK:
                cb(*cb_args)

        alert.connect('response', response, self, cb, *cb_args)
        alert.show_all()
        self.add_alert(alert)

    def get_cursor(self):
        return self._cursor

    def set_cursor(self, cursor):
        if not isinstance(cursor, Gdk.Cursor):
            cursor = CursorFactory().get_cursor(cursor)

        if self._cursor != cursor:
            self._cursor = cursor
            self.get_window().set_cursor(self._cursor)

    def __init__(self, canvas, handle):
        """
        Initialise the Activity.

        canvas -- Gtk.Widget
            root widget for activity content

        handle -- sugar3.activity.activityhandle.ActivityHandle
            instance providing the activity id and access to the

        """
        activity.Activity.__init__(self, handle)

        if handle.object_id:
            self.__state = _NEW_INSTANCE
        else:
            self.__state = _NEW_INSTANCE

        self.__resume_filename = None
        self.__postponed_share = []
        self.__on_save_instance = []

        self._cursor = None
        self.set_cursor(Gdk.CursorType.LEFT_PTR)

        # XXX do it after(possible) read_file() invoking
        # have to rely on calling read_file() from map_cb in sugar-toolkit
        canvas.connect_after('map', self.__map_canvasactivity_cb)
        self.set_canvas(canvas)

    def __instance(self):
        logging.debug('Activity.__instance')

        if self.__resume_filename:
            self.resume_instance(self.__resume_filename)
        else:
            self.new_instance()

        for i in self.__postponed_share:
            self.share_instance(*i)
        self.__postponed_share = []

        self.__state = _POST_INSTANCE

    def read_file(self, filepath):
        """Subclass should not override this method"""
        logging.debug('Activity.read_file state=%s' % self.__state)

        self.__resume_filename = filepath

        if self.__state == _NEW_INSTANCE:
            self.__state = _PRE_INSTANCE
        elif self.__state == _PRE_INSTANCE:
            self.__instance();

    def write_file(self, filepath):
        """Subclass should not override this method"""
        for cb, args in self.__on_save_instance:
            cb(*args)
        self.save_instance(filepath)

    def __map_canvasactivity_cb(self, widget):
        logging.debug('Activity.__map_canvasactivity_cb state=%s' % \
                self.__state)

        if self.__state == _NEW_INSTANCE:
            self.__instance()
        elif self.__state == _NEW_INSTANCE:
            self.__state = _PRE_INSTANCE
        elif self.__state == _PRE_INSTANCE:
            self.__instance();

        return False
    """
    def _share(self, tube_conn, initiator):
        logging.debug('Activity._share state=%s' % self.__state)

        if self.__state == _NEW_INSTANCE:
            self.__postponed_share.append((tube_conn, initiator))
            self.__state = _PRE_INSTANCE
        elif self.__state == _PRE_INSTANCE:
            self.__postponed_share.append((tube_conn, initiator))
            self.__instance();
        elif self.__state == _POST_INSTANCE:
            self.share_instance(tube_conn, initiator)
    """
"""
class SharedActivity(Activity):
    Basic activity class with sharing features

    def __init__(self, canvas, service, handle):
        
        Initialise the Activity.

        canvas -- Gtk.Widget
            root widget for activity content

        service -- string
            dbus service for activity

        handle -- sugar3.activity.activityhandle.ActivityHandle
            instance providing the activity id and access to the
            presence service which *may* provide sharing for this
            application

        
        Activity.__init__(self, canvas, handle)
        self.service = service

        self.connect('shared', self._shared_cb)

        # Owner.props.key
        if self._shared_activity:
            # We are joining the activity
            self.connect('joined', self._joined_cb)
            if self.get_shared():
                # We've already joined
                self._joined_cb()

    def _shared_cb(self, activity):
        logging.debug('My activity was shared')
        self.__initiator = True
        self._sharing_setup()

        logging.debug('This is my activity: making a tube...')
        id = self._tubes_chan[telepathy.CHANNEL_TYPE_TUBES].OfferDBusTube(
            self.service, {})

    def _joined_cb(self, activity):
        if not self._shared_activity:
            return

        logging.debug('Joined an existing shared activity')

        self.__initiator = False
        self._sharing_setup()

        logging.debug('This is not my activity: waiting for a tube...')
        self._tubes_chan[telepathy.CHANNEL_TYPE_TUBES].ListTubes(
            reply_handler=self._list_tubes_reply_cb,
            error_handler=self._list_tubes_error_cb)

    def _sharing_setup(self):
        if self._shared_activity is None:
            logging.error('Failed to share or join activity')
            return
        self._conn = self._shared_activity.telepathy_conn
        self._tubes_chan = self._shared_activity.telepathy_tubes_chan
        self._text_chan = self._shared_activity.telepathy_text_chan

        self._tubes_chan[telepathy.CHANNEL_TYPE_TUBES].connect_to_signal(
                'NewTube', self._new_tube_cb)

    def _list_tubes_reply_cb(self, tubes):
        for tube_info in tubes:
            self._new_tube_cb(*tube_info)

    def _list_tubes_error_cb(self, e):
        logging.error('ListTubes() failed: %s', e)

    def _new_tube_cb(self, id, initiator, type, service, params, state):
        logging.debug('New tube: ID=%d initator=%d type=%d service=%s '
                     'params=%r state=%d', id, initiator, type, service,
                     params, state)

        if (type == telepathy.TUBE_TYPE_DBUS and
                service == self.service):
            if state == telepathy.TUBE_STATE_LOCAL_PENDING:
                self._tubes_chan[telepathy.CHANNEL_TYPE_TUBES] \
                        .AcceptDBusTube(id)

            tube_conn = SugarTubeConnection(self._conn,
                self._tubes_chan[telepathy.CHANNEL_TYPE_TUBES], id,
                group_iface=self._text_chan[telepathy.CHANNEL_INTERFACE_GROUP])

            self._share(tube_conn, self.__initiator)
"""