# Copyright (C) 2019 Philipp Hörist <philipp AT hoerist.com>
# Copyright (C) 2019 Pavel R. <pd at narayana dot im>

# This file is part of Gajim OTR Plugin.
#
# Gajim OTR Plugin 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; version 3 only.
#
# This software 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 can always obtain full license text at <http://www.gnu.org/licenses/>.

# TODO: Fingerprints authentication GUI
# TODO: SMP authentication GUI
ERROR = None

import logging
from gajim.plugins import GajimPlugin
from gajim.common  import app
try:  from .otr import *
except ImportError: ERROR = 'python3-potr is missing'

# ...
class OTRPlugin(GajimPlugin): 
    log = logging.getLogger('gajim.p.otr')

    # init plugin #
    def init(self):
        self.encryption_name = 'OTR'
        self.description = 'Provides Off-the-Record encryption'
        self.activatable = (not ERROR) 
        self.available_text = (ERROR)
        self.instances = {}
        self.getinstance = lambda acct: self.instances.get(acct) or self.instances.setdefault(acct,OTR(self,acct))
        self.gui_extension_points = {
            'encrypt' + self.encryption_name: (self._encrypt_message, None),
            'decrypt': (self._decrypt_message, None),
        } 
    
    # activate encryption #
    @staticmethod
    def activate_encryption(ctl): 
        return True
        
    # encrypt file (just return same file)
    @staticmethod 
    def encrypt_file(file, account, callback): 
        callback(file)

    #  encrypt message #
    def _encrypt_message(self,con,event,callback):
        if not event.message or event.type_ != 'chat': return # drop empty and non-chat messages  
        otr = self.getinstance(event.conn.name)
        otr.encrypt(event,callback)
    
    # decrypt message #
    def _decrypt_message(self,con,event,callback):
        if (event.encrypted) or (event.name[0:2] == 'gc') or not (event.msgtxt or '').startswith('?OTR'): return  # skip non-OTR messages..
        if (event.name[0:3] == 'mam'): return setattr(event,'msgtxt','') # skip MAM messages (we can not decrypt OTR out of session)..
        if (app.config.get_per('encryption','%s-%s'%(event.conn.name,event.jid),'encryption')!=self.encryption_name): return # skip all when encryption not set to OTR
        otr = self.getinstance(event.conn.name)
        otr.decrypt(event,callback)