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

# SAT plugin for managing xep-0249
# Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014 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 sat.core.constants import Const as C
from logging import debug, info, warning, error
from twisted.words.xish import domish
from twisted.internet import protocol, defer
from twisted.words.protocols.jabber import client, jid, xmlstream

from zope.interface import implements

from wokkel import disco, iwokkel, data_form


try:
    from twisted.words.protocols.xmlstream import XMPPHandler
except ImportError:
    from wokkel.subprotocols import XMPPHandler

MESSAGE = '/message'
NS_DIRECT_MUC_INVITATION = 'jabber:x:conference'
DIRECT_MUC_INVITATION_REQUEST = MESSAGE + '/x[@xmlns="' + NS_DIRECT_MUC_INVITATION + '"]'
AUTOJOIN_KEY = "Misc"
AUTOJOIN_NAME = "Auto-join MUC on invitation"
AUTOJOIN_VALUES = ["ask", "always", "never"]

PLUGIN_INFO = {
    "name": "XEP 0249 Plugin",
    "import_name": "XEP-0249",
    "type": "XEP",
    "protocols": ["XEP-0249"],
    "dependencies": ["XEP-0045"],
    "main": "XEP_0249",
    "handler": "yes",
    "description": _("""Implementation of Direct MUC Invitations""")
}


class XEP_0249(object):

    params = """
    <params>
    <individual>
    <category name="%(category_name)s" label="%(category_label)s">
        <param name="%(param_name)s" label="%(param_label)s" value="%(param_default)s" type="list" security="0">
            %(param_options)s
        </param>
     </category>
    </individual>
    </params>
    """ % {
        'category_name': AUTOJOIN_KEY,
        'category_label': _("Misc"),
        'param_name': AUTOJOIN_NAME,
        'param_label': _("Auto-join MUC on invitation"),
        'param_default': AUTOJOIN_VALUES[0],
        'param_options': ['<option value="%s"/>' % value for value in AUTOJOIN_VALUES]
    }

    def __init__(self, host):
        info(_("Plugin XEP_0249 initialization"))
        self.host = host
        host.memory.updateParams(self.params)
        host.bridge.addMethod("inviteMUC", ".plugin", in_sign='sssa{ss}s', out_sign='', method=self._invite)

    def getHandler(self, profile):
        return XEP_0249_handler(self)

    def invite(self, target, room, options={}, profile_key=C.PROF_KEY_NONE):
        """
        Invite a user to a room
        @param target: jid of the user to invite
        @param room: jid of the room where the user is invited
        @options: attribute with extra info (reason, password) as in #XEP-0249
        @profile_key: %(doc_profile_key)s
        """
        profile = self.host.memory.getProfileName(profile_key)
        if not profile:
            error(_("Profile doesn't exists !"))
            return
        message = domish.Element((None, 'message'))
        message["to"] = target.full()
        x_elt = message.addElement('x', NS_DIRECT_MUC_INVITATION)
        x_elt['jid'] = room.userhost()
        for opt in options:
            x_elt[opt] = options[opt]
        self.host.profiles[profile].xmlstream.send(message)

    def _invite(self, target, service, roomId, options={}, profile_key=C.PROF_KEY_NONE):
        """
        Invite an user to a room
        @param target: jid of the user to invite
        @param service: jid of the MUC service
        @param roomId: name of the room
        @param profile_key: %(doc_profile_key)s
        """
        #TODO: check parameters validity
        self.invite(jid.JID(target), jid.JID("%s@%s" % (roomId, service)), options, profile_key)

    def _accept(self, room, profile_key=C.PROF_KEY_NONE):
        """
        Accept the invitation to join a MUC
        @param room: room jid as string
        """
        profile = self.host.memory.getProfileName(profile_key)
        if not profile:
            error(_("Profile doesn't exists !"))
            return
        info(_('Invitation accepted for room %(room)s [%(profile)s]') % {'room': room, 'profile': profile})
        _jid, xmlstream = self.host.getJidNStream(profile)
        d = self.host.plugins["XEP-0045"].join(jid.JID(room), _jid.user, {}, profile)

    def onInvitation(self, message, profile):
        """
        called when an invitation is received
        @param message: message element
        @profile: %(doc_profile)s
        """
        try:
            room = message.firstChildElement()['jid']
            info(_('Invitation received for room %(room)s [%(profile)s]') % {'room': room, 'profile': profile})
        except:
            error(_('Error while parsing invitation'))
            return
        from_ = message["from"]
        if room in self.host.plugins["XEP-0045"].clients[profile].joined_rooms:
            info(_("Invitation silently discarded because user is already in the room."))
            return
        autojoin = self.host.memory.getParamA(AUTOJOIN_NAME, AUTOJOIN_KEY, profile_key=profile)

        def accept_cb(conf_id, accepted, data, profile):
            if conf_id == room and accepted:
                self._accept(room, profile)

        if autojoin == "always":
            self._accept(room, profile)
        elif autojoin == "ask":
            data = {"message": _("You have been invited by %(user)s to join the room %(room)s. Do you accept?") % {'user': from_, 'room': room}, "title": _("MUC invitation")}
            self.host.askConfirmation(room, "YES/NO", data, accept_cb, profile)
        else:
            self.host.bridge.newAlert(_("An invitation from %(user)s to join the room %(room)s has been declined according to your personal settings.") % {'user': from_, 'room': room}, _("MUC invitation"), "INFO", profile)


class XEP_0249_handler(XMPPHandler):
    implements(iwokkel.IDisco)

    def __init__(self, plugin_parent):
        self.plugin_parent = plugin_parent
        self.host = plugin_parent.host

    def connectionInitialized(self):
        self.xmlstream.addObserver(DIRECT_MUC_INVITATION_REQUEST, self.plugin_parent.onInvitation, profile=self.parent.profile)

    def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
        return [disco.DiscoFeature(NS_DIRECT_MUC_INVITATION)]

    def getDiscoItems(self, requestor, target, nodeIdentifier=''):
        return []