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

""" PyConverter, convertitore in python creato da
        Frafra (francesco.it@gmail.com)
    col contributo di
        C8E e Drew Perttula

    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 2 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.
"""  
 
__module_name__ = "PyConverter"
__module_version__ = "2.2"
__module_description__ = "Converirore di numeri in varie basi"

choice = {
    "0":"quit",
    "1":"binario",
    "2":"decimale",
    "3":"ottale",
    "4":"esadecimale"
    }
valids = {
    "binario":"01",
    "decimale":"0123456789",
    "ottale":"01234567",
    "esadecimale":"0123456789ABCDEF"
    }

def conv(number, fromdigits, todigits):
    x = 0L
    for digit in str(number):
        x = x * len(fromdigits) + fromdigits.index(digit)
    res = ""
    while x > 0:
        digit = x % len(todigits)
        res = todigits[digit] + res
        x /= len(todigits)
    return res

def ask(message, valid_chars, min_len = 1, max_len = 10, max_retry = 10):
    for each in xrange(max_retry):
        answer = raw_input(message + " ")
        for char in answer:
            if char.upper() not in valid_chars:
                print "- Formato non valido, riprova."
                break
        else:
            if min_len <= len(answer) <= max_len:
                return answer
            else:
                print "- Formato non valido, riprova."
    print "- L'utente e' troppo stupido per usare questo programma."

def quit():
    print "- Arrivederci."
    raise SystemExit(0)

while 1:
    menu = "(0) Esci, (1) da binario, (2), da decimale, (3) da ottale, "
    menu += " (4) da esadecimale:"
    da = choice[ask(menu, "01234", 1, 1)]
    if da == "quit":
        quit()
    menu = "(0) Esci, (1) a binario, (2), a decimale, (3) a ottale, "
    menu += " (4) a esadecimale:"
    a = choice[ask(menu, "01234", 1, 1)]
    if a == "quit":
        quit()
    num = str(ask("- Inserire un numero %s:" % da, valids[da])).upper()
    print "- L'equivalente numero", a, "è", conv(num, valids[da], valids[a])