#!/usr/bin/env python3
# -*-coding:UTF-8 -*

"""
The BankAccount Module
======================

It apply IBAN regexes on item content and warn if above a threshold.

"""

import redis
import time
import redis
import datetime
import re
import string
from itertools import chain

from packages import Item
from pubsublogger import publisher

from Helper import Process

import signal

class TimeoutException(Exception):
    pass

def timeout_handler(signum, frame):
    raise TimeoutException

signal.signal(signal.SIGALRM, timeout_handler)

_LETTERS_IBAN = chain(enumerate(string.digits + string.ascii_uppercase),
                 enumerate(string.ascii_lowercase, 10))
LETTERS_IBAN = {ord(d): str(i) for i, d in _LETTERS_IBAN}

def iban_number(iban):
    return (iban[4:] + iban[:4]).translate(LETTERS_IBAN)

def is_valid_iban(iban):
    iban_numb = iban_number(iban)
    iban_numb_check = iban_number(iban[:2] + '00' + iban[4:])
    check_digit = '{:0>2}'.format(98 - (int(iban_numb_check) % 97))
    if check_digit == iban[2:4] and int(iban_numb) % 97 == 1:
        # valid iban
        print('valid iban')
        return True
    return False

def check_all_iban(l_iban, obj_id):
    nb_valid_iban = 0
    for iban in l_iban:
        iban = iban[0]+iban[1]+iban[2]
        iban = ''.join(e for e in iban if e.isalnum())
        #iban = iban.upper()
        res = iban_regex_verify.findall(iban)
        date = datetime.datetime.now().strftime("%Y%m")
        if res:
            print('checking '+iban)
            if is_valid_iban(iban):
                print('------')
                nb_valid_iban = nb_valid_iban + 1
                server_statistics.hincrby('iban_by_country:'+date, iban[0:2], 1)

    if(nb_valid_iban > 0):
        to_print = 'Iban;{};{};{};'.format(Item.get_source(obj_id), Item.get_item_date(obj_id), Item.get_basename(obj_id))
        publisher.warning('{}Checked found {} IBAN;{}'.format(
            to_print, nb_valid_iban, obj_id))
        msg = 'infoleak:automatic-detection="iban";{}'.format(obj_id)
        p.populate_set_out(msg, 'Tags')

        #Send to duplicate
        p.populate_set_out(obj_id, 'Duplicate')

if __name__ == "__main__":
    publisher.port = 6380
    publisher.channel = "Script"

    config_section = 'BankAccount'

    p = Process(config_section)
    max_execution_time = p.config.getint("BankAccount", "max_execution_time")

    # ARDB #
    server_statistics = redis.StrictRedis(
        host=p.config.get("ARDB_Statistics", "host"),
        port=p.config.getint("ARDB_Statistics", "port"),
        db=p.config.getint("ARDB_Statistics", "db"),
        decode_responses=True)

    publisher.info("BankAccount started")

    #iban_regex = re.compile(r'\b[A-Za-z]{2}[0-9]{2}(?:[ ]?[0-9]{4}){4}(?:[ ]?[0-9]{1,2})?\b')
    iban_regex = re.compile(r'\b([A-Za-z]{2}[ \-]?[0-9]{2})(?=(?:[ \-]?[A-Za-z0-9]){9,30})((?:[ \-]?[A-Za-z0-9]{3,5}){2,6})([ \-]?[A-Za-z0-9]{1,3})\b')
    iban_regex_verify = re.compile(r'^([A-Z]{2})([0-9]{2})([A-Z0-9]{9,30})$')


    while True:

        message = p.get_from_set()

        if message is not None:

            obj_id = Item.get_item_id(message)

            content = Item.get_item_content(obj_id)

            signal.alarm(max_execution_time)
            try:
                l_iban = iban_regex.findall(content)
            except TimeoutException:
                 print ("{0} processing timeout".format(obj_id))
                 continue
            else:
                signal.alarm(0)

            if(len(l_iban) > 0):
                check_all_iban(l_iban, obj_id)

        else:
            publisher.debug("Script BankAccount is Idling 10s")
            time.sleep(10)