# Copyright (C) 2006, 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

from sugar.presence import PresenceService
from sugar.graphics.iconcolor import IconColor
import gobject

_NOT_PRESENT_COLOR = "#888888,#BBBBBB"

class BuddyModel(gobject.GObject):
    __gsignals__ = {
        'appeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE, ([])),
        'disappeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE, ([])),
        'color-changed': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
                         ([gobject.TYPE_PYOBJECT])),
        'icon-changed': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
                         ([])),
        'current-activity-changed': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
                                    ([gobject.TYPE_PYOBJECT]))
    }

    def __init__(self, name=None, buddy=None):
        if name and buddy:
            raise RuntimeError("Must specify only _one_ of name or buddy.")

        gobject.GObject.__init__(self)

        self._ba_handler = None
        self._pc_handler = None
        self._dis_handler = None
        self._bic_handler = None
        self._cac_handler = None

        self._pservice = PresenceService.get_instance()

        self._buddy = None

        # If given just a name, try to get the buddy from the PS first
        if not buddy:
            self._name = name
            # FIXME: use public key, not name
            buddy = self._pservice.get_buddy_by_name(self._name)

        # If successful, copy properties from the PS buddy object
        if buddy:
            self.__update_buddy(buddy)
        else:
            # Otherwise, connect to the PS's buddy-appeared signal and
            # wait for the buddy to appear
            self._ba_handler = self._pservice.connect('buddy-appeared',
                    self.__buddy_appeared_cb)
            self._name = name
            # Set color to 'inactive'/'disconnected'
            self.__set_color_from_string(_NOT_PRESENT_COLOR)

    def __set_color_from_string(self, color_string):
        self._color = IconColor(color_string)

    def get_name(self):
        return self._name

    def get_color(self):
        return self._color

    def get_buddy(self):
        return self._buddy

    def is_present(self):
        if self._buddy:
            return True
        return False

    def get_current_activity(self):
        if self._buddy:
            return self._buddy.get_current_activity()
        return None

    def __update_buddy(self, buddy):
        if not buddy:
            raise ValueError("Buddy cannot be None.")

        self._buddy = buddy
        self._name = self._buddy.get_name()
        self.__set_color_from_string(self._buddy.get_color())

        self._pc_handler = self._buddy.connect('property-changed', self.__buddy_property_changed_cb)
        self._dis_handler = self._buddy.connect('disappeared', self.__buddy_disappeared_cb)
        self._bic_handler = self._buddy.connect('icon-changed', self.__buddy_icon_changed_cb)
        self._cac_handler = self._buddy.connect('current-activity-changed', self.__buddy_current_activity_changed_cb)

    def __buddy_appeared_cb(self, pservice, buddy):
        # FIXME: use public key rather than buddy name
        if self._buddy or buddy.get_name() != self._name:
            return

        if self._ba_handler:
            # Once we have the buddy, we no longer need to
            # monitor buddy-appeared events
            self._pservice.disconnect(self._ba_handler)
            self._ba_handler = None

        self.__update_buddy(buddy)
        self.emit('appeared')

    def __buddy_property_changed_cb(self, buddy, keys):
        if not self._buddy:
            return
        if 'color' in keys:
            self.__set_color_from_string(self._buddy.get_color())
            self.emit('color-changed', self.get_color())

    def __buddy_disappeared_cb(self, buddy):
        if buddy != self._buddy:
            return
        self._buddy.disconnect(self._pc_handler)
        self._buddy.disconnect(self._dis_handler)
        self._buddy.disconnect(self._bic_handler)
        self._buddy.disconnect(self._cac_handler)
        self.__set_color_from_string(_NOT_PRESENT_COLOR)
        self.emit('disappeared')
        self._buddy = None

    def __buddy_icon_changed_cb(self, buddy):
        self.emit('icon-changed')

    def __buddy_current_activity_changed_cb(self, buddy, activity=None):
        if not self._buddy:
            return
        self.emit('current-activity-changed', activity)