#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# CRANS_UTILS.PY-- Utils for Cr@ns gestion
#
# Copyright (c) 2010, Cr@ns <roots@crans.org>
# Author: Antoine Durand-Gasselin <adg@crans.org>
# All rights reserved.
#
# 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 Cr@ns 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 <COPYRIGHT HOLDER> 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 netaddr, time, smtplib
import config
from unicodedata import normalize

def ip_of_mid(mid):
    """Convertit un mid en son IP associée"""
    for net, plage in config.mid.items():
        if mid >= plage[0] and mid <= plage[1]:
            break
    else:
        raise ValueError("Mid dans aucune plage: %d" % mid)

    return netaddr.IPAddress(netaddr.IPNetwork(config.NETs[net]).first + mid - plage[0])

def strip_accents(a):
    """ Supression des accents de la chaîne fournie"""
    res = normalize('NFKD', a).encode('ASCII', 'ignore')
    return res.replace(' ', '_').replace("'", '')

def mailexist(mail):
    """Vérifie si une adresse mail existe ou non grace à la commande
    vrfy du serveur mail """

    mail = mail.split('@', 1)[0]
    try:
        s = smtplib.SMTP(config.smtpserv)
        s.putcmd("vrfy", mail)
        r = s.getreply()[0] in [250, 252]
        s.close()
    except:
        raise ValueError(u'Serveur de mail injoignable')

    return r

def format_mac(mac):
    u""" Formatage des adresses mac
    Transforme une adresse pour obtenir la forme xx:xx:xx:xx:xx:xx
    Retourne la mac formatée.
    """
    netaddr.EUI(mac, dialect='mac_unix')
    if not mac:
        raise ValueError(u"MAC nulle interdite\nIl doit être possible de modifier l'adresse de la carte.")
    return mac