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

"""
SAT plugin for managing xep-0054
Copyright (C) 2009, 2010, 2011, 2012  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 logging import debug, info, error
from twisted.internet import threads
from twisted.internet.defer import inlineCallbacks, returnValue
from twisted.words.protocols.jabber import jid
from twisted.words.protocols.jabber.xmlstream import IQ
import os.path

from zope.interface import implements

from wokkel import disco, iwokkel

from base64 import b64decode
from hashlib import sha1
from sat.core import exceptions
from sat.memory.persistent import PersistentDict

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

AVATAR_PATH = "avatars"

IQ_GET = '/iq[@type="get"]'
NS_VCARD = 'vcard-temp'
VCARD_REQUEST = IQ_GET + '/vCard[@xmlns="' + NS_VCARD + '"]'  #TODO: manage requests

PRESENCE = '/presence'
NS_VCARD_UPDATE = 'vcard-temp:x:update'
VCARD_UPDATE = PRESENCE + '/x[@xmlns="' +  NS_VCARD_UPDATE + '"]'

PLUGIN_INFO = {
"name": "XEP 0054 Plugin",
"import_name": "XEP-0054",
"type": "XEP",
"protocols": ["XEP-0054", "XEP-0153"],
"dependencies": [],
"main": "XEP_0054",
"handler": "yes",
"description": _("""Implementation of vcard-temp""")
}

class XEP_0054():
    #TODO: - check that nickname is ok
    #      - refactor the code/better use of Wokkel
    #      - get missing values

    def __init__(self, host):
        info(_("Plugin XEP_0054 initialization"))
        self.host = host
        self.avatar_path = os.path.join(self.host.memory.getConfig('', 'local_dir'), AVATAR_PATH)
        if not os.path.exists(self.avatar_path):
            os.makedirs(self.avatar_path)
        self.avatars_cache = PersistentDict(NS_VCARD)
        self.avatars_cache.load() #FIXME: resulting deferred must be correctly managed
        host.bridge.addMethod("getCard", ".plugin", in_sign='ss', out_sign='s', method=self.getCard)
        host.bridge.addMethod("getAvatarFile", ".plugin", in_sign='s', out_sign='s', method=self.getAvatarFile)

    def getHandler(self, profile):
        return XEP_0054_handler(self)  
  
    def _fillCachedValues(self, result, client):
        #FIXME: this is really suboptimal, need to be reworked
        #       the current naive approach keeps a map between all jids of all profiles
        #       in persistent cache, and check if cached jid are in roster, then put avatar
        #       hashs in memory.
        for _jid in client.roster.getBareJids():
            if _jid in self.avatars_cache:
                self.host.memory.updateEntityData(jid.JID(_jid), "avatar", self.avatars_cache[_jid], client.profile)
        
    def profileConnected(self, profile):
        client = self.host.getClient(profile)
        client.roster.got_roster.addCallback(self._fillCachedValues, client)
    
    def update_cache(self, jid, name, value, profile):
        """update cache value
        - save value in memory in case of change
        @param jid: jid of the owner of the vcard
        @param name: name of the item which changed
        @param value: new value of the item
        @param profile: profile which received the update
        """
        try:
            cached = self.host.memory.getEntityData(jid, [name], profile)
        except exceptions.UnknownEntityError:
            cached = {}
        if not name in cached or cached[name] != value:
            self.host.memory.updateEntityData(jid, name, value, profile)
            if name == "avatar":
                self.avatars_cache[jid.userhost()] = value
            
    def get_cache(self, jid, name, profile):
        """return cached value for jid
        @param jid: target contact
        @param name: name of the value ('nick' or 'avatar')
        @param profile: %(doc_profile)s
        @return: wanted value or None"""
        try:
            data = self.host.memory.getEntityData(jid, [name], profile)
        except exceptions.UnknownEntityError:
            return None
        return data.get(name)

    def save_photo(self, photo_xml):
        """Parse a <PHOTO> elem and save the picture"""
        for elem in photo_xml.elements():
            if elem.name == 'TYPE':
                info(_('Photo of type [%s] found') % str(elem))
            if elem.name == 'BINVAL':
                debug(_('Decoding binary'))
                decoded = b64decode(str(elem))
                hash = sha1(decoded).hexdigest()
                filename = self.avatar_path+'/'+hash
                if not os.path.exists(filename):
                    with open(filename,'wb') as file:
                        file.write(decoded)
                    debug(_("file saved to %s") % hash)
                else:
                    debug(_("file [%s] already in cache") % hash)
                return hash

    @inlineCallbacks
    def vCard2Dict(self, vcard, target, profile):
        """Convert a VCard to a dict, and save binaries"""
        debug (_("parsing vcard"))
        dictionary = {}
        
        for elem in vcard.elements():
            if elem.name == 'FN':
                dictionary['fullname'] = unicode(elem)
            elif elem.name == 'NICKNAME':
                dictionary['nick'] = unicode(elem)
                self.update_cache(target, 'nick', dictionary['nick'], profile)
            elif elem.name == 'URL':
                dictionary['website'] = unicode(elem)
            elif elem.name == 'EMAIL':
                dictionary['email'] = unicode(elem)
            elif elem.name == 'BDAY':
                dictionary['birthday'] = unicode(elem) 
            elif elem.name == 'PHOTO':
                dictionary["avatar"] = yield threads.deferToThread(self.save_photo, elem)
                if not dictionary["avatar"]:  #can happen in case of e.g. empty photo elem
                    del dictionary['avatar']
                else:
                    self.update_cache(target, 'avatar', dictionary['avatar'], profile)
            else:
                info (_('FIXME: [%s] VCard tag is not managed yet') % elem.name)

        returnValue(dictionary)

    def vcard_ok(self, answer, profile):
        """Called after the first get IQ"""
        debug (_("VCard found"))

        if answer.firstChildElement().name == "vCard":
            d = self.vCard2Dict(answer.firstChildElement(), jid.JID(answer["from"]), profile)
            d.addCallback(lambda data: self.host.bridge.actionResult("RESULT", answer['id'], data, profile))
        else:
            error (_("FIXME: vCard not found as first child element"))
            self.host.bridge.actionResult("SUPPRESS", answer['id'], {}, profile) #FIXME: maybe an error message would be better

    def vcard_err(self, failure, profile):
        """Called when something is wrong with registration"""
        error (_("Can't find VCard of %s") % failure.value.stanza['from'])
        self.host.bridge.actionResult("SUPPRESS", failure.value.stanza['id'], {}, profile) #FIXME: maybe an error message would be better
  
    def getCard(self, target, profile_key='@DEFAULT@'):
        """Ask server for VCard
        @param target: jid from which we want the VCard
        @result: id to retrieve the profile"""
        current_jid, xmlstream = self.host.getJidNStream(profile_key)
        if not xmlstream:
            error (_('Asking vcard for an non-existant or not connected profile'))
            return ""
        profile = self.host.memory.getProfileName(profile_key)
        to_jid = jid.JID(target)
        debug(_("Asking for %s's VCard") % to_jid.userhost())
        reg_request=IQ(xmlstream,'get')
        reg_request["from"]=current_jid.full()
        reg_request["to"] = to_jid.userhost()
        reg_request.addElement('vCard', NS_VCARD)
        reg_request.send(to_jid.userhost()).addCallbacks(self.vcard_ok, self.vcard_err, callbackArgs=[profile], errbackArgs=[profile])
        return reg_request["id"] 

    def getAvatarFile(self, hash):
        """Give the full path of avatar from hash
        @param hash: SHA1 hash
        @return full_path
        """
        filename = self.avatar_path+'/'+hash
        if not os.path.exists(filename):
            error (_("Asking for an uncached avatar [%s]") %  hash)
            return ""
        return filename


class XEP_0054_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(VCARD_UPDATE, self.update)
    
    def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
        return [disco.DiscoFeature(NS_VCARD)]

    def getDiscoItems(self, requestor, target, nodeIdentifier=''):
        return []
    
    def update(self, presence):
        """Request for VCard's nickname
        return the cached nickname if exists, else get VCard
        """
        from_jid = jid.JID(presence['from'])
        #FIXME: wokkel's data_form should be used here
        x_elem = filter (lambda x:x.name == "x", presence.elements())[0] #We only want the "x" element
        for elem in x_elem.elements():
            if elem.name == 'photo':
                _hash = str(elem)
                old_avatar = self.plugin_parent.get_cache(from_jid, 'avatar', self.parent.profile)
                if not old_avatar or old_avatar != _hash:
                    debug(_('New avatar found, requesting vcard'))
                    self.plugin_parent.getCard(from_jid.userhost(), self.parent.profile)