"""
    SleekXMPP: The Sleek XMPP Library
    Copyright (C) 2012  Nathanael C. Fritz
    This file is part of SleekXMPP.

    See the file LICENSE for copying permission.
"""

import logging

from sleekxmpp.stanza import StreamFeatures
from sleekxmpp.features.feature_rosterver import stanza
from sleekxmpp.xmlstream import register_stanza_plugin
from sleekxmpp.plugins.base import BasePlugin


log = logging.getLogger(__name__)


class FeatureRosterVer(BasePlugin):

    name = 'feature_rosterver'
    description = 'RFC 6121: Stream Feature: Roster Versioning'
    dependences = set()
    stanza = stanza

    def plugin_init(self):
        self.xmpp.register_feature('rosterver',
                self._handle_rosterver,
                restart=False,
                order=9000)

        register_stanza_plugin(StreamFeatures, stanza.RosterVer)

    def _handle_rosterver(self, features):
        """Enable using roster versioning.

        Arguments:
            features -- The stream features stanza.
        """
        log.debug("Enabling roster versioning.")
        self.xmpp.features.add('rosterver')
