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

"""
SAT plugin for managing xep-0045
Copyright (C) 2009, 2010, 2011  Jérôme Poisson (goffi@goffi.org)

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU 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 General Public License for more details.

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

from logging import debug, info, warning, error
from twisted.words.xish import domish
from twisted.internet import protocol, defer, threads, reactor
from twisted.words.protocols.jabber import client, jid, xmlstream
from twisted.words.protocols.jabber import error as jab_error
from twisted.words.protocols.jabber.xmlstream import IQ
import os.path
import uuid

from zope.interface import implements

from wokkel import disco, iwokkel, muc

from base64 import b64decode
from hashlib import sha1
from time import sleep

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

PLUGIN_INFO = {
"name": "XEP 0045 Plugin",
"import_name": "XEP-0045",
"type": "XEP",
"protocols": ["XEP-0045"],
"dependencies": [],
"main": "XEP_0045",
"handler": "yes",
"description": _("""Implementation of Multi-User Chat""")
}

class XEP_0045():

    def __init__(self, host):
        info(_("Plugin XEP_0045 initialization"))
        self.host = host
        self.clients={}
        host.bridge.addMethod("joinMUC", ".communication", in_sign='ssss', out_sign='', method=self._join)
        host.bridge.addMethod("getRoomJoined", ".communication", in_sign='s', out_sign='a(ssass)', method=self.getRoomJoined)
        host.bridge.addMethod("getRoomSubjects", ".communication", in_sign='s', out_sign='a(sss)', method=self.getRoomSubjects)
        host.bridge.addMethod("getUniqueRoomName", ".communication", in_sign='s', out_sign='s', method=self.getUniqueName)
        host.bridge.addSignal("roomJoined", ".communication", signature='ssasss') #args: room_id, room_service, room_nicks, user_nick, profile
        host.bridge.addSignal("roomUserJoined", ".communication", signature='sssa{ss}s') #args: room_id, room_service, user_nick, user_data, profile
        host.bridge.addSignal("roomUserLeft", ".communication", signature='sssa{ss}s') #args: room_id, room_service, user_nick, user_data, profile
        host.bridge.addSignal("roomNewSubject", ".communication", signature='ssss') #args: room_id, room_service, subject, profile

    def __check_profile(self, profile):
        """check if profile is used and connected
        if profile known but disconnected, remove it from known profiles
        @param profile: profile to check
        @return: True if the profile is known and connected, else False"""
        if not profile or not self.clients.has_key(profile) or not self.host.isConnected(profile):
            error (_('Unknown or disconnected profile (%s)') % profile)
            if self.clients.has_key(profile):
                del self.clients[profile]
            return False
        return True

    def __room_joined(self, room, profile):
        """Called when the user is in the requested room"""
        def _sendBridgeSignal(ignore=None):
            self.host.bridge.roomJoined(room.roomIdentifier, room.service, [user.nick for user in room.roster.values()], room.nick, profile)

        room_jid = room.roomIdentifier+'@'+room.service
        self.clients[profile].joined_rooms[room_jid] = room
        if room.status == '201':
            #FIXME: the current behaviour is to create an instant room
            #and send the signal only when the room is unlocked
            #a proper configuration management should be done
            #TODO: wokkel's muc currently doesn't manage correctly message from the room
            #      service (without resource) in room.getUser 
            self.clients[profile].configure(room_jid).addCallbacks(_sendBridgeSignal, lambda x: error(_('Error while configuring the room')))
        else:
            _sendBridgeSignal()
        return room


    def __err_joining_room(self, failure, profile):
        """Called when something is going wrong when joining the room"""
        mess = _("Error when joining the room")
        error (mess)
        self.host.bridge.newAlert(mess, _("Group chat error"), "ERROR", profile)

    def getRoomJoined(self, profile_key='@DEFAULT@'):
        """Return room where user is"""
        profile = self.host.memory.getProfileName(profile_key)
        result = []
        if not self.__check_profile(profile):
            return result
        for room in self.clients[profile].joined_rooms.values():
            result.append((room.roomIdentifier, room.service, [user.nick for user in room.roster.values()], room.nick))
        return result

    def getRoomNick(self, room_jid, profile_key='@DEFAULT@'):
        """return nick used in room by user
        @param room_jid: unicode room id
        @profile_key: profile
        @return: nick or empty string in case of error"""
        profile = self.host.memory.getProfileName(profile_key)
        if not self.__check_profile(profile) or not self.clients[profile].joined_rooms.has_key(room_jid):
            return ''
        return self.clients[profile].joined_rooms[room_jid].nick


    def getRoomSubjects(self, profile_key='@DEFAULT@'):
        """Return received subjects of rooms"""
        profile = self.host.memory.getProfileName(profile_key)
        if not self.__check_profile(profile):
            return []
        return self.clients[profile].rec_subjects.values()

    def getUniqueName(self, profile_key='@DEFAULT@'):
        """Return unique name for room, avoiding collision"""
        #TODO: we should use #RFC-0045 10.1.4 when available here
        #TODO: we should be able to select the MUC service here
        return uuid.uuid1() 

    def join(self, service, roomId, nick, profile_key='@DEFAULT@'):
        def _errDeferred(exc_obj = Exception, txt='Error while joining room'):
            d = defer.Deferred()
            d.errback(exc_obj(txt))

        profile = self.host.memory.getProfileName(profile_key)
        if not self.__check_profile(profile):
            return _errDeferred() 
        room_jid = roomId+'@'+service
        if self.clients[profile].joined_rooms.has_key(room_jid):
            warning(_('%(profile)s is already in room %(room_jid)s') % {'profile':profile, 'room_jid':room_jid})
            return _errDeferred() 
        info (_("[%(profile)s] is joining room %(room)s with nick %(nick)s") % {'profile':profile,'room':roomId+'@'+service, 'nick':nick})
        try:
            return self.clients[profile].join(service, roomId, nick).addCallbacks(self.__room_joined, self.__err_joining_room, callbackKeywords={'profile':profile}, errbackKeywords={'profile':profile})
        except:
            #XXX: this is a ugly workaround as MUCClient thrown an error if there is invalid chars in the room jid (like with the default string)
            #FIXME: must be removed when MUCClient manage this better
            d = _errDeferred(txt="ugly workaround")
            d.addErrback(self.__err_joining_room, profile)
            return d

    def _join(self, service, roomId, nick, profile_key='@DEFAULT@'):
        """join method used by bridge: use the _join method, but doesn't return any deferred"""
        d = self.join(service, roomId, nick, profile_key)
        d.addErrback(lambda x: warning(_('Error while joining room'))) #TODO: error management + signal in bridge
    
    def getHandler(self, profile):
        self.clients[profile] = SatMUCClient(self)
        return self.clients[profile]
   


class SatMUCClient (muc.MUCClient):
    #implements(iwokkel.IDisco)
   
    def __init__(self, plugin_parent):
        self.plugin_parent = plugin_parent
        self.host = plugin_parent.host
        muc.MUCClient.__init__(self)
        self.joined_rooms = {}
        self.rec_subjects = {}
        print "init SatMUCClient OK"
    
    def receivedGroupChat(self, room, user, body):
        debug('receivedGroupChat: room=%s user=%s body=%s', room, user, body)

    def userJoinedRoom(self, room, user):
        debug (_("user %(nick)s has joined room (%(room_id)s)") % {'nick':user.nick, 'room_id':room.occupantJID.userhost()})
        if not self.host.trigger.point("MUC user joined", room, user, self.parent.profile):
            return
        user_data={'entity':user.entity or '', 'affiliation':user.affiliation, 'role':user.role} 
        self.host.bridge.roomUserJoined(room.roomIdentifier, room.service, user.nick, user_data, self.parent.profile)
    
    def userLeftRoom(self, room, user):
        debug (_("user %(nick)s left room (%(room_id)s)") % {'nick':user.nick, 'room_id':room.occupantJID.userhost()})
        user_data={'entity':user.entity or '', 'affiliation':user.affiliation, 'role':user.role} 
        self.host.bridge.roomUserLeft(room.roomIdentifier, room.service, user.nick, user_data, self.parent.profile)

    def userUpdatedStatus(self, room, user, show, status):
        print("FIXME: MUC status not managed yet")
        #FIXME: gof

    def receivedSubject(self, occupantJID, subject):
        room = self._getRoom(occupantJID)
        debug (_("New subject for room (%(room_id)s): %(subject)s") % {'room_id':room.occupantJID.userhost(),'subject':subject})
        room_jid = room.roomIdentifier+'@'+room.service
        self.rec_subjects[room_jid] = (room.roomIdentifier, room.service, subject)
        self.host.bridge.roomNewSubject(room.roomIdentifier, room.service, subject, self.parent.profile)

    #def connectionInitialized(self):
        #pass
    
    #def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
        #return [disco.DiscoFeature(NS_VCARD)]

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