"""
This module defines form classes for domain editing.

"""
from __future__ import absolute_import, unicode_literals

import re

from django import forms
from django.urls import reverse
from django.utils.translation import ugettext as _

from crispy_forms.helper import FormHelper
from crispy_forms.layout import (
    Layout,
    Submit,
)

from .models import HostingDomain


def relative_domain_validator(value):
    """
    This validator ensures that the given value is a valid lowercase domain
    name.

    """
    if len(value) > 254:
        raise forms.ValidationError(
            _('host name too long'), code='too-long')
    allowed = re.compile(r"(?!-)[a-z\d-]{1,63}(?<!-)$")
    if not all(allowed.match(x) for x in value.split('.')):
        raise forms.ValidationError(_('invalid domain name'))


class CreateHostingDomainForm(forms.ModelForm):
    """
    This form is used to create new HostingDomain instances.

    """
    class Meta:
        model = HostingDomain
        fields = ['domain']

    def __init__(self, instance, *args, **kwargs):
        self.hosting_package = kwargs.pop('hostingpackage')
        super(CreateHostingDomainForm, self).__init__(*args, **kwargs)
        self.fields['domain'].validators.append(relative_domain_validator)
        self.helper = FormHelper()
        self.helper.form_action = reverse(
            'create_hosting_domain', kwargs={
                'package': self.hosting_package.id
            })
        self.helper.layout = Layout(
            'domain',
            Submit('submit', _('Add Hosting Domain')),
        )

    def clean(self):
        self.cleaned_data = super(CreateHostingDomainForm, self).clean()
        self.cleaned_data['hosting_package'] = self.hosting_package

    def save(self, commit=True):
        return HostingDomain.objects.create_for_hosting_package(
            commit=commit, **self.cleaned_data)

    def save_m2m(self):
        pass