# Slixmpp: The Slick XMPP Library
# Copyright (C) 2013 Nathanael C. Fritz, Lance J.T. Stout
# This file is part of Slixmpp.
# See the file LICENSE for copying permission.
from datetime import datetime, timezone

from typing import Optional

from slixmpp import JID
from slixmpp.stanza import Presence
from slixmpp.plugins import BasePlugin
from slixmpp.xmlstream import register_stanza_plugin
from slixmpp.xmlstream.handler import Callback
from slixmpp.xmlstream.matcher import StanzaPath
from slixmpp.plugins.xep_0319 import stanza


def get_local_timezone():
    return datetime.now(timezone.utc).astimezone().tzinfo


class XEP_0319(BasePlugin):
    name = 'xep_0319'
    description = 'XEP-0319: Last User Interaction in Presence'
    dependencies = {'xep_0012'}
    stanza = stanza

    def plugin_init(self):
        self._idle_stamps = {}
        register_stanza_plugin(Presence, stanza.Idle)
        self.api.register(self._set_idle, 'set_idle', default=True)
        self.api.register(self._get_idle, 'get_idle', default=True)
        self.xmpp.register_handler(Callback(
            'Idle Presence',
            StanzaPath('presence/idle'),
            self._idle_presence
        ))
        self.xmpp.add_filter('out', self._stamp_idle_presence)

    def session_bind(self, jid):
        self.xmpp['xep_0030'].add_feature('urn:xmpp:idle:1')

    def plugin_end(self):
        self.xmpp['xep_0030'].del_feature(feature='urn:xmpp:idle:1')
        self.xmpp.del_filter('out', self._stamp_idle_presence)
        self.xmpp.remove_handler('Idle Presence')

    async def idle(self, jid: Optional[JID] = None,
                   since: Optional[datetime] = None):
        """Set an idle duration for a JID

        .. versionchanged:: 1.8.0
            This function is now a coroutine.
        """
        seconds = None
        timezone = get_local_timezone()
        if since is None:
            since = datetime.now(timezone)
        else:
            seconds = datetime.now(timezone) - since
        await self.api['set_idle'](jid, None, None, since)
        await self.xmpp['xep_0012'].set_last_activity(jid=jid, seconds=seconds)

    async def active(self, jid: Optional[JID] = None):
        """Reset the idle timer.

        .. versionchanged:: 1.8.0
            This function is now a coroutine.
        """
        await self.api['set_idle'](jid, None, None, None)
        await self.xmpp['xep_0012'].del_last_activity(jid)

    def _set_idle(self, jid, node, ifrom, data):
        self._idle_stamps[jid] = data

    def _get_idle(self, jid, node, ifrom, data):
        return self._idle_stamps.get(jid, None)

    def _idle_presence(self, pres):
        self.xmpp.event('presence_idle', pres)

    async def _stamp_idle_presence(self, stanza):
        if isinstance(stanza, Presence):
            since = await self.api['get_idle'](stanza['from'] or self.xmpp.boundjid)
            if since:
                stanza['idle']['since'] = since
        return stanza