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

"""
    Slixmpp: The Slick XMPP Library
    Copyright (C) 2010  Nathanael C. Fritz
    This file is part of Slixmpp.

    See the file LICENSE for copying permission.
"""

import logging
from getpass import getpass
from argparse import ArgumentParser

import slixmpp
from slixmpp.exceptions import IqError, IqTimeout
from slixmpp.xmlstream.asyncio import asyncio


class Disco(slixmpp.ClientXMPP):

    """
    A demonstration for using basic service discovery.

    Send a disco#info and disco#items request to a JID/node combination,
    and print out the results.

    May also request only particular info categories such as just features,
    or just items.
    """

    def __init__(self, jid, password, target_jid, target_node='', get=''):
        slixmpp.ClientXMPP.__init__(self, jid, password)

        # Using service discovery requires the XEP-0030 plugin.
        self.register_plugin('xep_0030')

        self.get = get
        self.target_jid = target_jid
        self.target_node = target_node

        # Values to control which disco entities are reported
        self.info_types = ['', 'all', 'info', 'identities', 'features']
        self.identity_types = ['', 'all', 'info', 'identities']
        self.feature_types = ['', 'all', 'info', 'features']
        self.items_types = ['', 'all', 'items']


        # The session_start event will be triggered when
        # the bot establishes its connection with the server
        # and the XML streams are ready for use. We want to
        # listen for this event so that we we can initialize
        # our roster.
        self.add_event_handler("session_start", self.start)

    @asyncio.coroutine
    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.

        In this case, we send disco#info and disco#items
        stanzas to the requested JID and print the results.

        Arguments:
            event -- An empty dictionary. The session_start
                     event does not provide any additional
                     data.
        """
        self.get_roster()
        self.send_presence()

        try:
            if self.get in self.info_types:
                # By using block=True, the result stanza will be
                # returned. Execution will block until the reply is
                # received. Non-blocking options would be to listen
                # for the disco_info event, or passing a handler
                # function using the callback parameter.
                info = yield from self['xep_0030'].get_info(jid=self.target_jid,
                                                            node=self.target_node)
            if self.get in self.items_types:
                # The same applies from above. Listen for the
                # disco_items event or pass a callback function
                # if you need to process a non-blocking request.
                items = yield from self['xep_0030'].get_items(jid=self.target_jid,
                                                              node=self.target_node)
            if self.get not in self.info_types and self.get not in self.items_types:
                logging.error("Invalid disco request type.")
                return
        except IqError as e:
            logging.error("Entity returned an error: %s" % e.iq['error']['condition'])
        except IqTimeout:
            logging.error("No response received.")
        else:
            header = 'XMPP Service Discovery: %s' % self.target_jid
            print(header)
            print('-' * len(header))
            if self.target_node != '':
                print('Node: %s' % self.target_node)
                print('-' * len(header))

            if self.get in self.identity_types:
                print('Identities:')
                for identity in info['disco_info']['identities']:
                    print('  - %s' % str(identity))

            if self.get in self.feature_types:
                print('Features:')
                for feature in info['disco_info']['features']:
                    print('  - %s' % feature)

            if self.get in self.items_types:
                print('Items:')
                for item in items['disco_items']['items']:
                    print('  - %s' % str(item))
        finally:
            self.disconnect()


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

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

    # 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")
    parser.add_argument("query", choices=["all", "info", "items", "identities", "features"])
    parser.add_argument("target_jid")
    parser.add_argument("node", nargs='?')

    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: ")

    # Setup the Disco browser.
    xmpp = Disco(args.jid, args.password, args.target_jid, args.node, args.query)

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