# 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 sugar import env
from sugar.graphics.xocolor import XoColor

from jarabe.model.buddy import BuddyModel
from jarabe.model import neighborhood

class FriendBuddyModel(BuddyModel):
    __gtype_name__ = 'SugarFriendBuddyModel'

    _NOT_PRESENT_COLOR = "#D5D5D5,#FFFFFF"

    def __init__(self, nick, key):
        self._online_buddy = None

        BuddyModel.__init__(self, nick=nick, key=key)

        neighborhood_model = neighborhood.get_model()
        neighborhood_model.connect('buddy-added', self.__buddy_added_cb)
        neighborhood_model.connect('buddy-removed', self.__buddy_removed_cb)

        buddy = neighborhood_model.get_buddy_by_key(key)
        if buddy is not None:
            self._set_online_buddy(buddy)

    def __buddy_added_cb(self, neighborhood, buddy):
        if buddy.key != self.key:
            return
        self._set_online_buddy(buddy)

    def _set_online_buddy(self, buddy):
        self._online_buddy = buddy
        self._online_buddy.connect('notify::color', self.__notify_color_cb)
        self.notify('color')
        self.notify('present')

    def __buddy_removed_cb(self, neighborhood, buddy):
        if buddy.key != self.key:
            return
        self._online_buddy = None
        self.notify('color')
        self.notify('present')

    def __notify_color_cb(self, buddy, pspec):
        self.notify('color')

    def is_present(self):
        return self._online_buddy is not None

    present = gobject.property(type=bool, default=False, getter=is_present)

    def get_color(self):
        if self._online_buddy is not None:
            return self._online_buddy.color
        else:
            return XoColor(FriendBuddyModel._NOT_PRESENT_COLOR)

    color = gobject.property(type=object, getter=get_color)

    def get_handle(self):
        if self._online_buddy is not None:
            return self._online_buddy.handle
        else:
            return None

    handle = gobject.property(type=object, getter=get_handle)

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):
            buddy = FriendBuddyModel(key=buddy.key, nick=buddy.nick)
            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 = FriendBuddyModel(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())

        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