"""
    SleekXMPP: The Sleek XMPP Library
    Copyright (C) 2011  Nathanael C. Fritz
    This file is part of SleekXMPP.

    See the file LICENSE for copying permission.
"""

import logging

from sleekxmpp.stanza import Iq, StreamFeatures
from sleekxmpp.xmlstream import register_stanza_plugin
from sleekxmpp.plugins import BasePlugin

from sleekxmpp.features.feature_session import stanza


log = logging.getLogger(__name__)


class FeatureSession(BasePlugin):

    name = 'feature_session'
    description = 'RFC 3920: Stream Feature: Start Session'
    dependencies = set()
    stanza = stanza

    def plugin_init(self):
        self.xmpp.register_feature('session',
                self._handle_start_session,
                restart=False,
                order=10001)

        register_stanza_plugin(Iq, stanza.Session)
        register_stanza_plugin(StreamFeatures, stanza.Session)

    def _handle_start_session(self, features):
        """
        Handle the start of the session.

        Arguments:
            feature -- The stream features element.
        """
        iq = self.xmpp.Iq()
        iq['type'] = 'set'
        iq.enable('session')
        iq.send(now=True)

        self.xmpp.features.add('session')

        log.debug("Established Session")
        self.xmpp.sessionstarted = True
        self.xmpp.session_started_event.set()
        self.xmpp.event('session_start')
