# -*- coding: utf-8 -*-
'''
calc.py: DNS-based czech-english dictionary

Copyright (c) 2009, Zdenek Vasicek (vasicek AT fit.vutbr.cz)
                    Marek Vavrusa  (xvavru00 AT stud.fit.vutbr.cz)

This software is open source.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

   * Redistributions of source code must retain the above copyright notice,
     this list of conditions and the following disclaimer.

   * Redistributions in binary form must reproduce the above copyright notice,
     this list of conditions and the following disclaimer in the documentation
     and/or other materials provided with the distribution.

   * Neither the name of the organization nor the names of its
     contributors may be used to endorse or promote products derived from this
     software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
'''
import os
cz_dict = {}
en_dict = {}

def init(id, cfg):
  log_info("pythonmod: dict init")
  f = open("examples/dict_data.txt", "r")
  try:
     for line in f:
        if line.startswith('#'):
           continue
        itm = line.split("\t", 3)
        if len(itm) < 2:
           continue
        en,cs = itm[0:2]

        if not (cs in cz_dict):
           cz_dict[cs] = [en]     # [cs] = en
        else:
           cz_dict[cs].append(en) # [cs] = en

        if not (en in en_dict):
           en_dict[en] = [cs]     # [en] = cs
        else:
           en_dict[en].append(cs) # [en] = cs

  finally:
     f.close()
  return True

def deinit(id):
  log_info("pythonmod: dict deinit")
  return True

def operate(id, event, qstate, qdata):
   if (event == MODULE_EVENT_NEW) or (event == MODULE_EVENT_PASS):

      if qstate.qinfo.qname_str.endswith("._dict_.cz."):

        aword = ' '.join(qstate.qinfo.qname_list[0:-4])
        adict = qstate.qinfo.qname_list[-4]

        log_info("pythonmod: dictionary look up; word:%s dict:%s" % (aword,adict))

        words = []
        if (adict == "en") and (aword in en_dict):
           words = en_dict[aword] # EN -> CS
        if (adict == "cs") and (aword in cz_dict):
           words = cz_dict[aword] # CS -> EN

        if len(words) and ((qstate.qinfo.qtype == RR_TYPE_TXT) or (qstate.qinfo.qtype == RR_TYPE_ANY)):

           msg = DNSMessage(qstate.qinfo.qname_str, RR_TYPE_TXT, RR_CLASS_IN, PKT_RD | PKT_RA | PKT_AA)
           for w in words:
               msg.answer.append("%s 300 IN TXT \"%s\"" % (qstate.qinfo.qname_str,w.replace("\"","\\\"")))

           if not msg.set_return_msg(qstate):
              qstate.ext_state[id] = MODULE_ERROR
              return True

           qstate.return_rcode = RCODE_NOERROR
           qstate.ext_state[id] = MODULE_FINISHED
           return True

        else:
           qstate.return_rcode = RCODE_SERVFAIL
           qstate.ext_state[id] = MODULE_FINISHED
           return True

      else: #Pass on the unknown query to the iterator
        qstate.ext_state[id] = MODULE_WAIT_MODULE
        return True

   elif event == MODULE_EVENT_MODDONE: #the iterator has finished
        #we don't need modify result
        qstate.ext_state[id] = MODULE_FINISHED
        return True

   log_err("pythonmod: Unknown event")
   qstate.ext_state[id] = MODULE_ERROR
   return True

def inform_super(id, qstate, superqstate, qdata):
  return True