# Slixmpp: The Slick XMPP Library
# Copyright (C) 2020 Mathieu Pasquet
# This file is part of Slixmpp.
# See the file LICENSE for copying permission.
from typing import Iterable, Optional

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

from slixmpp.plugins.xep_0437 import stanza


class XEP_0437(BasePlugin):
    name = 'xep_0437'
    description = 'XEP-0437: Room Activity Indicators'
    stanza = stanza
    namespace = stanza.NS

    def plugin_init(self):
        stanza.register_plugins()
        self.xmpp.register_handler(Callback(
            'RAI Received',
            StanzaPath("presence/rai"),
            self._handle_rai,
        ))
        self.xmpp.register_handler(Callback(
            'RAI Activity Received',
            StanzaPath("presence/rai/activity"),
            self._handle_rai_activity,
        ))

    def plugin_end(self):
        self.xmpp.remove_handler('RAI received')
        self.xmpp.remove_handler('RAI Activity received')

    def _handle_rai(self, presence: Presence):
        self.xmpp.event('room_activity_bare', presence)

    def _handle_rai_activity(self, presence: Presence):
        self.xmpp.event('room_activity', presence)

    def subscribe(self, service: JID, *,
                  pfrom: Optional[JID] = None):
        """
        Subscribe to room activty on a MUC service.
        :param JID service: MUC service
        """
        pres = self.xmpp.make_presence(pto=service, pfrom=pfrom)
        pres.enable('rai')
        pres.send()

    def unsubscribe(self, service: JID, *,
                    pfrom: Optional[JID] = None):
        """
        Unsubscribe from room activty on a MUC service.
        :param JID service: MUC service
        """
        pres = self.xmpp.make_presence(
            pto=service, pfrom=pfrom, ptype='unavailable',
        )
        pres.send()