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

"""
    Slixmpp: The Slick XMPP Library
    Copyright (C) 2012  Nathanael C. Fritz
    This file is part of Slixmpp.

    See the file LICENSE for copying permission.
"""

import logging
from getpass import getpass
import threading
from argparse import ArgumentParser

import slixmpp
from slixmpp.exceptions import XMPPError


FILE_TYPES = {
    'image/png': 'png',
    'image/gif': 'gif',
    'image/jpeg': 'jpg'
}


class AvatarDownloader(slixmpp.ClientXMPP):

    """
    A basic script for downloading the avatars for a user's contacts.
    """

    def __init__(self, jid, password):
        slixmpp.ClientXMPP.__init__(self, jid, password)
        self.add_event_handler("session_start", self.start)
        self.add_event_handler("changed_status", self.wait_for_presences)

        self.add_event_handler('vcard_avatar_update', self.on_vcard_avatar)
        self.add_event_handler('avatar_metadata_publish', self.on_avatar)

        self.received = set()
        self.presences_received = threading.Event()

    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.
        """
        self.send_presence()
        self.get_roster()

        print('Waiting for presence updates...\n')
        self.presences_received.wait(15)
        self.disconnect(wait=True)

    def on_vcard_avatar(self, pres):
        print("Received vCard avatar update from %s" % pres['from'].bare)
        try:
            result = self['xep_0054'].get_vcard(pres['from'], cached=True)
        except XMPPError:
            print("Error retrieving avatar for %s" % pres['from'])
            return
        avatar = result['vcard_temp']['PHOTO']

        filetype = FILE_TYPES.get(avatar['TYPE'], 'png')
        filename = 'vcard_avatar_%s_%s.%s' % (
                pres['from'].bare,
                pres['vcard_temp_update']['photo'],
                filetype)
        with open(filename, 'w+') as img:
            img.write(avatar['BINVAL'])

    def on_avatar(self, msg):
        print("Received avatar update from %s" % msg['from'])
        metadata = msg['pubsub_event']['items']['item']['avatar_metadata']
        for info in metadata['items']:
            if not info['url']:
                try:
                    result = self['xep_0084'].retrieve_avatar(msg['from'], info['id'])
                except XMPPError:
                    print("Error retrieving avatar for %s" % msg['from'])
                    return

                avatar = result['pubsub']['items']['item']['avatar_data']

                filetype = FILE_TYPES.get(metadata['type'], 'png')
                filename = 'avatar_%s_%s.%s' % (msg['from'].bare, info['id'], filetype)
                with open(filename, 'w+') as img:
                    img.write(avatar['value'])
            else:
                # We could retrieve the avatar via HTTP, etc here instead.
                pass

    def wait_for_presences(self, pres):
        """
        Wait to receive updates from all roster contacts.
        """
        self.received.add(pres['from'].bare)
        if len(self.received) >= len(self.client_roster.keys()):
            self.presences_received.set()
        else:
            self.presences_received.clear()


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

    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: ")

    xmpp = AvatarDownloader(args.jid, args.password)
    xmpp.register_plugin('xep_0054')
    xmpp.register_plugin('xep_0153')
    xmpp.register_plugin('xep_0084')

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