# Copyright (C) 2006-2007 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

import os
import logging
from ConfigParser import ConfigParser

import gobject
import dbus

from jarabe.model.buddy import BuddyModel
from sugar import env

class Friends(gobject.GObject):
    __gsignals__ = {
        'friend-added':   (gobject.SIGNAL_RUN_FIRST,
                           gobject.TYPE_NONE, ([object])),
        'friend-removed': (gobject.SIGNAL_RUN_FIRST,
                           gobject.TYPE_NONE, ([str]))
    }

    def __init__(self):
        gobject.GObject.__init__(self)

        self._friends = {}
        self._path = os.path.join(env.get_profile_path(), 'friends')

        self.load()

    def has_buddy(self, buddy):
        return self._friends.has_key(buddy.get_key())

    def add_friend(self, buddy_info):
        self._friends[buddy_info.get_key()] = buddy_info
        self.emit('friend-added', buddy_info)

    def make_friend(self, buddy):
        if not self.has_buddy(buddy):
            self.add_friend(buddy)
            self.save()

    def remove(self, buddy_info):
        del self._friends[buddy_info.get_key()]
        self.save()
        self.emit('friend-removed', buddy_info.get_key())

    def __iter__(self):
        return self._friends.values().__iter__()

    def load(self):
        cp = ConfigParser()

        try:
            success = cp.read([self._path])
            if success:
                for key in cp.sections():
                    # HACK: don't screw up on old friends files
                    if len(key) < 20:
                        continue
                    buddy = BuddyModel(key=key, nick=cp.get(key, 'nick'))
                    self.add_friend(buddy)
        except Exception:
            logging.exception('Error parsing friends file')

    def save(self):
        cp = ConfigParser()

        for friend in self:
            section = friend.get_key()
            cp.add_section(section)
            cp.set(section, 'nick', friend.get_nick())
            cp.set(section, 'color', friend.get_color().to_string())

        fileobject = open(self._path, 'w')
        cp.write(fileobject)
        fileobject.close()

        self._sync_friends()

    def _sync_friends(self):
        # XXX: temporary hack
        # remove this when the shell service has a D-Bus API for buddies

        def friends_synced():
            pass

        def friends_synced_error(e):
            logging.error('Error asking presence service to sync friends: %s',
                e)

        keys = []
        for friend in self:
            keys.append(friend.get_key())

        bus = dbus.SessionBus()
        ps = bus.get_object('org.laptop.Sugar.Presence',
            '/org/laptop/Sugar/Presence')
        psi = dbus.Interface(ps, 'org.laptop.Sugar.Presence')
        psi.SyncFriends(keys,
                reply_handler=friends_synced,
                error_handler=friends_synced_error)

_model = None

def get_model():
    global _model
    if _model is None:
        _model = Friends()
    return _model