#!/usr/bin/env python3

import logging
from getpass import getpass
from argparse import ArgumentParser

import slixmpp
from slixmpp.xmlstream import ET, tostring
from slixmpp.xmlstream.matcher import StanzaPath
from slixmpp.xmlstream.handler import Callback


class PubsubEvents(slixmpp.ClientXMPP):

    def __init__(self, jid, password):
        super().__init__(jid, password)

        self.register_plugin('xep_0030')
        self.register_plugin('xep_0059')
        self.register_plugin('xep_0060')

        self.add_event_handler('session_start', self.start)

        # Some services may require configuration to allow
        # sending delete, configuration, or subscription  events.
        self.add_event_handler('pubsub_publish', self._publish)
        self.add_event_handler('pubsub_retract', self._retract)
        self.add_event_handler('pubsub_purge', self._purge)
        self.add_event_handler('pubsub_delete', self._delete)
        self.add_event_handler('pubsub_config', self._config)
        self.add_event_handler('pubsub_subscription', self._subscription)

        # Want to use nicer, more specific pubsub event names?
        # self['xep_0060'].map_node_event('node_name', 'event_prefix')
        # self.add_event_handler('event_prefix_publish', handler)
        # self.add_event_handler('event_prefix_retract', handler)
        # self.add_event_handler('event_prefix_purge', handler)
        # self.add_event_handler('event_prefix_delete', handler)

    async def start(self, event):
        await self.get_roster()
        self.send_presence()

    def _publish(self, msg):
        """Handle receiving a publish item event."""
        print('Published item %s to %s:' % (
            msg['pubsub_event']['items']['item']['id'],
            msg['pubsub_event']['items']['node']))
        data = msg['pubsub_event']['items']['item']['payload']
        if data is not None:
            print(tostring(data))
        else:
            print('No item content')

    def _retract(self, msg):
        """Handle receiving a retract item event."""
        print('Retracted item %s from %s' % (
            msg['pubsub_event']['items']['retract']['id'],
            msg['pubsub_event']['items']['node']))

    def _purge(self, msg):
        """Handle receiving a node purge event."""
        print('Purged all items from %s' % (
            msg['pubsub_event']['purge']['node']))

    def _delete(self, msg):
        """Handle receiving a node deletion event."""
        print('Deleted node %s' % (
           msg['pubsub_event']['delete']['node']))

    def _config(self, msg):
        """Handle receiving a node configuration event."""
        print('Configured node %s:' % (
            msg['pubsub_event']['configuration']['node']))
        print(msg['pubsub_event']['configuration']['form'])

    def _subscription(self, msg):
        """Handle receiving a node subscription event."""
        print('Subscription change for node %s:' % (
            msg['pubsub_event']['subscription']['node']))
        print(msg['pubsub_event']['subscription'])


if __name__ == '__main__':
    # Setup the command line arguments.
    parser = ArgumentParser()

    # Output verbosity options.
    parser.add_argument("-q", "--quiet", help="set logging to ERROR",
                        action="store_const", dest="loglevel",
                        const=logging.ERROR, default=logging.INFO)
    parser.add_argument("-d", "--debug", help="set logging to DEBUG",
                        action="store_const", dest="loglevel",
                        const=logging.DEBUG, default=logging.INFO)

    # JID and password options.
    parser.add_argument("-j", "--jid", dest="jid",
                        help="JID to use")
    parser.add_argument("-p", "--password", dest="password",
                        help="password to use")

    args = parser.parse_args()

    # Setup logging.
    logging.basicConfig(level=args.loglevel,
                        format='%(levelname)-8s %(message)s')

    if args.jid is None:
        args.jid = input("Username: ")
    if args.password is None:
        args.password = getpass("Password: ")

    logging.info("Run this in conjunction with the pubsub_client.py " + \
                 "example to watch events happen as you give commands.")

    # Setup the PubsubEvents listener
    xmpp = PubsubEvents(args.jid, args.password)

    # Connect to the XMPP server and start processing XMPP stanzas.
    xmpp.connect()
    xmpp.process()
