# Slixmpp: The Slick XMPP Library
# Copyright (C) 2012 Nathanael C. Fritz, Lance J.T. Stout
# This file is part of Slixmpp.
# See the file LICENSE for copying permission.
import logging

from slixmpp import Presence
from slixmpp.exceptions import XMPPError
from slixmpp.plugins import BasePlugin, register_plugin
from slixmpp.xmlstream import register_stanza_plugin

from slixmpp.plugins.xep_0012 import stanza, LastActivity


log = logging.getLogger(__name__)


class XEP_0256(BasePlugin):

    name = 'xep_0256'
    description = 'XEP-0256: Last Activity in Presence'
    dependencies = {'xep_0012'}
    stanza = stanza
    default_config = {
        'auto_last_activity': False
    }

    def plugin_init(self):
        register_stanza_plugin(Presence, LastActivity)

        self.xmpp.add_filter('out', self._initial_presence_activity)
        self.xmpp.add_event_handler('connected', self._reset_presence_activity)

        self._initial_presence = set()

    def plugin_end(self):
        self.xmpp.del_filter('out', self._initial_presence_activity)
        self.xmpp.del_event_handler('connected', self._reset_presence_activity)

    def _reset_presence_activity(self, e):
        self._initial_presence = set()

    def _initial_presence_activity(self, stanza):
        if isinstance(stanza, Presence):
            use_last_activity = False

            if self.auto_last_activity and  stanza['show'] in ('xa', 'away'):
                use_last_activity = True

            if stanza['from'] not in self._initial_presence:
                self._initial_presence.add(stanza['from'])
                use_last_activity = True

            if use_last_activity:
                plugin = self.xmpp['xep_0012']
                try:
                    result = plugin.api['get_last_activity'](stanza['from'],
                                                             None,
                                                             stanza['to'])
                    seconds = result['last_activity']['seconds']
                except XMPPError:
                    seconds = None

                if seconds is not None:
                    stanza['last_activity']['seconds'] = seconds
        return stanza


register_plugin(XEP_0256)