# This file is part of dnmgmt, a number resource management system
# Licensed under GNU General Public License v3 or later
# Written by Sebastian Lohff (seba@someserver.de)

from django.core import validators
from django.core.exceptions import ValidationError
from django.utils import six
from django.utils.deconstruct import deconstructible
from django.utils.translation import ugettext_lazy as _

import re
import ipaddress


@deconstructible
class HandleValidator(validators.RegexValidator):
	regex = r'^(?:[A-Z]+[0-9]*(-[A-Z]+)|AUTO)$'
	message = _(
		'Enter a valid handle (all uppercase)'
	)
	flags = re.ASCII if six.PY3 else 0


@deconstructible
class HandleValidatorWithSuffix(validators.RegexValidator):
	flags = re.ASCII if six.PY3 else 0

	def __init__(self, suffix):
		self.regex = r'^(?:[A-Z]+[0-9]*-%s|AUTO)$' % re.escape(suffix)
		self.message = _(
			'Enter a valid handle with suffix %s (all uppercase), e.g. FOO3-%s' % (suffix, suffix)
		)

		super(HandleValidatorWithSuffix, self).__init__()


def IP46CIDRValidator(value):
	if not re.match(r"[0-9a-fA-F:.]+/[0-9]+", value):
		raise ValidationError("Address needs to be a subnet in the format of ip/prefix")

	try:
		ipaddress.ip_network(value)
	except ValueError as e:
		raise ValidationError(str(e))