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

"""
SAT plugin for managing xep-0096
Copyright (C) 2009  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, error
from twisted.words.xish import domish
from twisted.internet import protocol
from twisted.words.protocols.jabber import client, jid, xmlstream
from twisted.words.protocols.jabber import error as jab_error
import os.path
from twisted.internet import reactor #FIXME best way ???
import pdb

from zope.interface import implements

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

from wokkel import disco, iwokkel

IQ_SET = '/iq[@type="set"]'
NS_SI = 'http://jabber.org/protocol/si'
SI_REQUEST = IQ_SET + '/si[@xmlns="' + NS_SI + '"]'

PLUGIN_INFO = {
"name": "XEP 0096 Plugin",
"import_name": "XEP_0096",
"type": "XEP",
"protocols": ["XEP-0096"],
"dependencies": ["XEP_0065"],
"main": "XEP_0096",
"description": """Implementation of SI File Transfert"""
}

class XEP_0096(XMPPHandler):
    implements(iwokkel.IDisco)

    def __init__(self, host):
        info("Plugin XEP_0096 initialization")
        self.host = host
        self._waiting_for_approval = {}
        host.bridge.addMethod("sendFile", ".communication", in_sign='ss', out_sign='s', method=self.sendFile)
    
    def connectionInitialized(self):
        self.xmlstream.addObserver(SI_REQUEST, self.xep_96)


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

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

    def xep_96(self, IQ):
        info ("XEP-0096 management")
        IQ.handled=True
        SI_elem = IQ.firstChildElement()
        debug(SI_elem.toXml())
        filename = ""
        file_size = ""
        for element in SI_elem.elements():
            if element.name == "file":
                info ("File proposed: name=[%s] size=%s", element['name'], element['size'])
                filename = element["name"]
                file_size = element["size"]
            elif element.name == "feature":
                from_jid = IQ["from"]
                self._waiting_for_approval[IQ["id"]] = (element, from_jid, file_size)
                data={ "filename":filename, "from":from_jid, "size":file_size }
                self.host.askConfirmation(IQ["id"], "FILE_TRANSFERT", data, self.confirmationCB)

    def confirmationCB(self, id, accepted, data):
        """Called on confirmation answer"""
        if accepted:
            data['size'] = self._waiting_for_approval[id][2]
            self.host.plugins["XEP_0065"].setData(data, id)
            self.approved(id)
        else:
            debug ("Transfert [%s] refused", id)
            del(self._waiting_for_approval[id])

    def approved(self, id):
        """must be called when a file transfert has be accepted by client"""
        debug ("Transfert [%s] accepted", id)

        if ( not self._waiting_for_approval.has_key(id) ):
            error ("Approved unknow id !")
            #TODO: manage this (maybe approved by several frontends)
        else:
            element, from_id, size = self._waiting_for_approval[id]
            del(self._waiting_for_approval[id])
            self.negociate(element, id, from_id)

    def negociate(self, feat_elem, id, to_jid):
        #TODO: put this in a plugin
        #FIXME: over ultra mega ugly, need to be generic
        info ("Feature negociation")
        data = feat_elem.firstChildElement()
        field = data.firstChildElement()
        #FIXME: several options ! Q&D code for test only
        option = field.firstChildElement()
        value = option.firstChildElement()
        if unicode(value) == "http://jabber.org/protocol/bytestreams":
            #ugly, as usual, need to be entirely rewritten (just for test !)
            result = domish.Element(('', 'iq'))
            result['type'] = 'result'
            result['id'] = id
            result['to'] = to_jid 
            si = result.addElement('si', 'http://jabber.org/protocol/si')
            file = si.addElement('file', 'http://jabber.org/protocol/si/profile/file-transfer')
            feature = si.addElement('feature', 'http://jabber.org/protocol/feature-neg')
            x = feature.addElement('x', 'jabber:x:data')
            x['type'] = 'submit'
            field = x.addElement('field')
            field['var'] = 'stream-method'
            value = field.addElement('value')
            value.addContent('http://jabber.org/protocol/bytestreams')
            self.host.xmlstream.send(result)
    
    def fileCB(self, answer):
        if answer['type']=="result":  #FIXME FIXME FIXME ugly ugly ugly ! and temp FIXME FIXME FIXME
            info("SENDING UGLY ANSWER")
            offer=client.IQ(self.host.xmlstream,'set')
            offer["from"]=self.host.me.full()
            offer["to"]=answer['from']
            query=offer.addElement('query', 'http://jabber.org/protocol/bytestreams')
            query['mode']='tcp'
            streamhost=query.addElement('streamhost')
            streamhost['host']=self.host.memory.getParamA("IP", "File Transfert")
            streamhost['port']=self.host.memory.getParamA("Port", "File Transfert")
            streamhost['jid']=self.host.me.full()
            offer.send()




    def sendFile(self, to, filepath):
        """send a file using XEP-0096
        Return an unique id to identify the transfert
        """
        debug ("sendfile (%s) to %s", filepath, to )
        print type(filepath), type(to)
        
        statinfo = os.stat(filepath)

        offer=client.IQ(self.host.xmlstream,'set')
        debug ("Transfert ID: %s", offer["id"])

        self.host.plugins["XEP_0065"].sendFile(offer["id"], filepath, str(statinfo.st_size))

        offer["from"]=self.host.me.full()
        offer["to"]=jid.JID(to).full()
        si=offer.addElement('si','http://jabber.org/protocol/si')
        si["mime-type"]='text/plain'
        si["profile"]='http://jabber.org/protocol/si/profile/file-transfer'
        file = si.addElement('file', 'http://jabber.org/protocol/si/profile/file-transfer')
        file['name']=os.path.basename(filepath)
        file['size']=str(statinfo.st_size)

        ###
        # FIXME: Ugly temporary hard coded implementation of XEP-0020 & XEP-0004,
        #        Need to be recoded elsewhere in a more generic way
        ###

        feature=si.addElement('feature', "http://jabber.org/protocol/feature-neg")
        x=feature.addElement('x', "jabber:x:data")
        x['type']='form'
        field=x.addElement('field')
        field['type']='list-single'
        field['var']='stream-method'
        option = field.addElement('option')
        value = option.addElement('value', content='http://jabber.org/protocol/bytestreams')

        offer.addCallback(self.fileCB)
        offer.send()
        return offer["id"]  #XXX: using IQ id as file transfert id seems OK as IQ id are required