# Slixmpp: The Slick XMPP Library
# Copyright (C) 2012 Nathanael C. Fritz, Lance J.T. Stout
# This file is part of Slixmpp.
# See the file LICENSE for copying permission.
import logging
import ssl

from slixmpp.stanza import StreamFeatures, Iq
from slixmpp.xmlstream import register_stanza_plugin, JID
from slixmpp.plugins import BasePlugin
from slixmpp.plugins.xep_0077 import stanza, Register, RegisterFeature


log = logging.getLogger(__name__)


class XEP_0077(BasePlugin):

    """
    XEP-0077: In-Band Registration
    """

    name = 'xep_0077'
    description = 'XEP-0077: In-Band Registration'
    dependencies = {'xep_0004', 'xep_0066'}
    stanza = stanza
    default_config = {
        'create_account': True,
        'force_registration': False,
        'order': 50
    }

    def plugin_init(self):
        register_stanza_plugin(StreamFeatures, RegisterFeature)
        register_stanza_plugin(Iq, Register)

        if not self.xmpp.is_component:
            self.xmpp.register_feature('register',
                self._handle_register_feature,
                restart=False,
                order=self.order)

        register_stanza_plugin(Register, self.xmpp['xep_0004'].stanza.Form)
        register_stanza_plugin(Register, self.xmpp['xep_0066'].stanza.OOB)

        self.xmpp.add_event_handler('connected', self._force_registration)

    def plugin_end(self):
        if not self.xmpp.is_component:
            self.xmpp.unregister_feature('register', self.order)

    def _force_registration(self, event):
        if self.force_registration:
            self.xmpp.add_filter('in', self._force_stream_feature)

    def _force_stream_feature(self, stanza):
        if isinstance(stanza, StreamFeatures):
            if not self.xmpp.disable_starttls:
                if 'starttls' not in self.xmpp.features:
                    return stanza
                elif not isinstance(self.xmpp.socket, ssl.SSLSocket):
                    return stanza
            if 'mechanisms' not in self.xmpp.features:
                log.debug('Forced adding in-band registration stream feature')
                stanza.enable('register')
                self.xmpp.del_filter('in', self._force_stream_feature)
        return stanza

    def _handle_register_feature(self, features):
        if 'mechanisms' in self.xmpp.features:
            # We have already logged in with an account
            return False

        if self.create_account and self.xmpp.event_handled('register'):
            form = self.get_registration()
            self.xmpp.event('register', form)
            return True
        return False

    def get_registration(self, jid=None, ifrom=None,
                         timeout=None, callback=None):
        iq = self.xmpp.Iq()
        iq['type'] = 'get'
        iq['to'] = jid
        iq['from'] = ifrom
        iq.enable('register')
        return iq.send(timeout=timeout, callback=callback)

    def cancel_registration(self, jid=None, ifrom=None,
                            timeout=None, callback=None):
        iq = self.xmpp.Iq()
        iq['type'] = 'set'
        iq['to'] = jid
        iq['from'] = ifrom
        iq['register']['remove'] = True
        return iq.send(timeout=timeout, callback=callback)

    def change_password(self, password, jid=None, ifrom=None,
                        timeout=None, callback=None):
        iq = self.xmpp.Iq()
        iq['type'] = 'set'
        iq['to'] = jid
        iq['from'] = ifrom
        if self.xmpp.is_component:
            ifrom = JID(ifrom)
            iq['register']['username'] = ifrom.user
        else:
            iq['register']['username'] = self.xmpp.boundjid.user
        iq['register']['password'] = password
        return iq.send(timeout=timeout, callback=callback)