#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# file: idlebot.py
# date: 23.07.2020
# desc: class to deal with server related jabber events and muc-offline
# presences.

import time
import random
import logging
import slixmpp
logging = logging.getLogger(__name__)


class IdleBot(slixmpp.ClientXMPP):

    """
    Connect the given server, logs in and join the given room. If lost
    connection to server it tryes to reconnect.
    """

    def __init__(self, jid, password, room, nick):
        slixmpp.ClientXMPP.__init__(self, jid, password)

        self.nick = nick
        self.room = room
        self.room_roster = {}
        self.add_event_handler("session_start", self.start)
        self.add_event_handler("session_end", self.reconnect)
        self.add_event_handler("disconnected", self.reconnect)
        self.add_event_handler("muc::%s::got_online" % self.room,
                               self.muc_online)
        self.add_event_handler("muc::%s::got_offline" % room,
                               self.muc_offline)

    async def start(self, event):
        """
        Process the session_start event.
        Typical actions for the session_start event are
        requesting the roster and broadcasting an initial
        presence stanza.
        Arguments:
            event -- An empty dictionary. The session_start
                     event does not provide any additional
                     data.
        """
        await self.get_roster()
        logging.info('Send presence')
        self.send_presence()
        self.join_room(self.room)

    def join_room(self, room):
        '''
        Sends a presence stanza for the given chat room.
        Arguments:
            room -- The room to join.
        '''
        self.plugin['xep_0045'].join_muc(room,
                                         self.nick) # ,
                                         # If a room password is needed, use:
                                         # password=the_room_password,
                                         # wait=True)
        logging.info('Joined room {}'.format(room))
        self.room_roster[room] = []

    def muc_online(self, presence):
        """
        Process a presence stanza from a chat room. In this case,
        we only add the sers nick to our room roster. Items in
        presence['muc'] are 'room', 'nick', 'jid', 'lang', 'role',
        'affiliation'. Because 'jid' is (depends on server) possible
        empty, we only can add 'nick' to the roster.
        Arguments:
            presence -- The received presence stanza. See the
                        documentation for the Presence stanza
                        to see how else it may be used.
        """
        nick = presence['muc']['nick']
        room = presence['muc']['room']
        if nick not in self.room_roster[room]:
            self.room_roster[room].append(nick)
        logging.debug('Roster: {}'.format(self.room_roster))

        # if bot joins the room great
        greeting = ("Hello everybody, my name is {} and i'am the "
                   "new kid in town. :)".format(self.nick))
        if presence['muc']['nick'] == self.nick:
            self.send_message(mto = room,
                              mbody = greeting,
                              mtype = 'groupchat')

    def muc_offline(self, presence):
        """
        Process a presence stanza from a chat room. At first we look
        for the nick who leaves the room. In case we are the user, we
        clear the roster and try to rejoin. Otherwise we remove the nick
        from roster.
        Arguments:
            presence -- The received presence stanza. See the
                        documentation for the Presence stanza
                        to see how else it may be used.
        """
        nick = presence['muc']['nick']
        room = presence['muc']['room']
        if nick == self.nick:
            self.room_roster[room] = []
            logging.info('Receive unavailable from {}'.format(room))
            timeout = random.randint(0,10)
            logging.debug('Set timeout to {}'.format(timeout))
            time.sleep(timeout)
            self.join_room(room)
        else:
            if nick in self.room_roster[room]:
                self.room_roster[room].remove(nick)
        logging.debug('Roster: {}'.format(self.room_roster))

    def reconnect(self, event):
        '''
        Deals with alls events for disconnections. Tryes to reconnect.
        '''
        logging.warning('Receive a disconnect event: {}'.format(event))
        logging.info('Try to reconnect')
        self.connect()

    def hangup(self):
        '''
        Process a disconnect from server. Is only called from
        KeyboardInterrup exception to disconnect from server and terminate
        the process..
        '''
        self.disconnect()

    def run(self):
        '''
        Registers needed plugins, connect the server and try to hold this
        connection.
        '''
        self.register_plugin('xep_0045') # Multi-User Chat
        self.register_plugin('xep_0012') # Last Activity
        self.connect()
        try:
            self.process(forever=True)
        except KeyboardInterrupt:
            self.hangup()