#!/usr/bin/python
# -*- coding: utf-8 -*-

# SAT plugin for managing xep-0077
# Copyright (C) 2009, 2010, 2011, 2012, 2013 Jérôme Poisson (goffi@goffi.org)

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from sat.core.i18n import _
from logging import debug, info, error
from twisted.words.protocols.jabber import jid
from twisted.words.protocols.jabber.xmlstream import IQ
from sat.tools.xml_tools import dataForm2XMLUI

from wokkel import data_form

NS_REG = 'jabber:iq:register'

PLUGIN_INFO = {
    "name": "XEP 0077 Plugin",
    "import_name": "XEP-0077",
    "type": "XEP",
    "protocols": ["XEP-0077"],
    "dependencies": [],
    "main": "XEP_0077",
    "description": _("""Implementation of in-band registration""")
}


class XEP_0077(object):

    def __init__(self, host):
        info(_("Plugin XEP_0077 initialization"))
        self.host = host
        self.triggers = {}  # used by other protocol (e.g. XEP-0100) to finish registration. key = target_jid
        host.bridge.addMethod("in_band_register", ".plugin", in_sign='ss', out_sign='s', method=self.in_band_register)
        host.bridge.addMethod("in_band_submit", ".plugin", in_sign='ssa(ss)s', out_sign='s', method=self.in_band_submit)

    def addTrigger(self, target, cb, profile):
        """Add a callback which is called when registration to target is successful"""
        self.triggers[target] = (cb, profile)

    def reg_ok(self, answer, profile):
        """Called after the first get IQ"""
        try:
            x_elem = filter(lambda x: x.name == "x", answer.firstChildElement().elements())[0]  # We only want the "x" element (data form)
        except IndexError:
            info(_("No data form found"))
            #TODO: manage registration without data form
            answer_data = {"reason": "unmanaged", "message": _("This gateway can't be managed by SàT, sorry :(")}
            answer_type = "ERROR"
            self.host.bridge.actionResult(answer_type, answer['id'], answer_data, profile)
            return

        form = data_form.Form.fromElement(x_elem)
        xml_data = dataForm2XMLUI(form, "").toXml()
        self.host.bridge.actionResult("XMLUI", answer['id'], {"target": answer["from"], "type": "registration", "xml": xml_data}, profile)

    def reg_err(self, failure, profile):
        """Called when something is wrong with registration"""
        info(_("Registration failure: %s") % str(failure.value))
        answer_data = {}
        answer_data['reason'] = 'unknown'
        answer_data = {"message": "%s [code: %s]" % (failure.value.condition, unicode(failure.value))}
        answer_type = "ERROR"
        self.host.bridge.actionResult(answer_type, failure.value.stanza['id'], answer_data, profile)

    def unregistrationAnswer(self, answer, profile):
        debug(_("registration answer: %s") % answer.toXml())
        answer_type = "SUCCESS"
        answer_data = {"message": _("Your are now unregistred")}
        self.host.bridge.actionResult(answer_type, answer['id'], answer_data, profile)

    def unregistrationFailure(self, failure, profile):
        info(_("Unregistration failure: %s") % str(failure.value))
        answer_type = "ERROR"
        answer_data = {}
        answer_data['reason'] = 'unknown'
        answer_data = {"message": _("Unregistration failed: %s") % failure.value.condition}
        self.host.bridge.actionResult(answer_type, failure.value.stanza['id'], answer_data, profile)

    def registrationAnswer(self, answer, profile):
        debug(_("registration answer: %s") % answer.toXml())
        answer_type = "SUCCESS"
        answer_data = {"message": _("Registration successfull")}
        self.host.bridge.actionResult(answer_type, answer['id'], answer_data, profile)
        if answer["from"] in self.triggers:
            callback, profile = self.triggers[answer["from"]]
            callback(answer["from"], profile)
            del self.triggers[answer["from"]]

    def registrationFailure(self, failure, profile):
        info(_("Registration failure: %s") % str(failure.value))
        print failure.value.stanza.toXml()
        answer_type = "ERROR"
        answer_data = {}
        if failure.value.condition == 'conflict':
            answer_data['reason'] = 'conflict'
            answer_data = {"message": _("Username already exists, please choose an other one")}
        else:
            answer_data['reason'] = 'unknown'
            answer_data = {"message": _("Registration failed")}
        self.host.bridge.actionResult(answer_type, failure.value.stanza['id'], answer_data, profile)
        if failure.value.stanza["from"] in self.triggers:
            del self.triggers[failure.value.stanza["from"]]

    def in_band_submit(self, action, target, fields, profile):
        """Submit a form for registration, using data_form"""
        id, deferred = self.host.submitForm(action, target, fields, profile)
        if action == 'CANCEL':
            deferred.addCallbacks(self.unregistrationAnswer, self.unregistrationFailure, callbackArgs=[profile], errbackArgs=[profile])
        else:
            deferred.addCallbacks(self.registrationAnswer, self.registrationFailure, callbackArgs=[profile], errbackArgs=[profile])
        return id

    def in_band_register(self, target, profile_key='@DEFAULT@'):
        """register to a target JID"""
        client = self.host.getClient(profile_key)
        if not client:
            error(_('Asking for an non-existant or not connected profile'))
            return ""
        to_jid = jid.JID(target)
        debug(_("Asking registration for [%s]") % to_jid.full())
        reg_request = IQ(client.xmlstream, 'get')
        reg_request["from"] = client.jid.full()
        reg_request["to"] = to_jid.full()
        reg_request.addElement('query', NS_REG)
        reg_request.send(to_jid.full()).addCallbacks(self.reg_ok, self.reg_err, callbackArgs=[client.profile], errbackArgs=[client.profile])
        return reg_request["id"]