# -*- coding: UTF-8 -*-
# Copyright (c) 2008 - 2010, Pascal Volk
# See COPYING for distribution information.

"""Virtual Mail Manager's EmailAddress class to handle e-mail addresses."""

import re

import VirtualMailManager.constants.ERROR as ERR
from VirtualMailManager import chk_domainname
from VirtualMailManager.Exceptions import VMMEmailAddressException as VMMEAE

RE_LOCALPART = """[^\w!#$%&'\*\+-\.\/=?^_`{\|}~]"""

class EmailAddress(object):
    __slots__ = ('_localpart', '_domainname')
    def __init__(self, address):
        self._localpart = None
        self._domainname = None
        self.__chkAddress(address)

    def __eq__(self, other):
        if isinstance(other, self.__class__):
            return self._localpart == other._localpart\
                    and self._domainname == other._domainname
        return NotImplemented

    def __ne__(self, other):
        if isinstance(other, self.__class__):
            return self._localpart != other._localpart\
                    or self._domainname != other._domainname
        return NotImplemented

    def __repr__(self):
        return "EmailAddress('%s@%s')" % (self._localpart, self._domainname)

    def __str__(self):
        return "%s@%s" % (self._localpart, self._domainname)

    def __chkAddress(self, address):
        try:
            localpart, domain = address.split('@')
        except ValueError:
            raise VMMEAE(_(u"Missing '@' sign in e-mail address “%s”.") %
                         address, ERR.INVALID_ADDRESS)
        except AttributeError:
            raise VMMEAE(_(u"“%s” doesn't look like an e-mail address.") %
                         address, ERR.INVALID_ADDRESS)
        if len(domain) > 0:
            domain = chk_domainname(domain)
        else:
            raise VMMEAE(_(u"Missing domain name after “%s@”.") % localpart,
                         ERR.DOMAIN_NO_NAME)
        localpart = self.__chkLocalpart(localpart)
        self._localpart, self._domainname = localpart, domain

    def __chkLocalpart(self, localpart):
        """Validates the local-part of an e-mail address.

        Arguments:
        localpart -- local-part of the e-mail address that should be validated (str)
        """
        if len(localpart) < 1:
            raise VMMEAE(_(u'No local-part specified.'),
                ERR.LOCALPART_INVALID)
        if len(localpart) > 64:
            raise VMMEAE(_(u'The local-part “%s” is too long') %
                localpart, ERR.LOCALPART_TOO_LONG)
        ic = set(re.findall(RE_LOCALPART, localpart))
        if len(ic):
            ichrs = ''
            for c in ic:
                ichrs += u"“%s” " % c
            raise VMMEAE(_(u"The local-part “%(lpart)s” contains invalid\
 characters: %(ichrs)s") % {'lpart': localpart, 'ichrs': ichrs},
                ERR.LOCALPART_INVALID)
        return localpart