from django import forms

from whoisdb.forms import MntFormMixin

from .models import Domain, Nameserver

import re


class DomainForm(MntFormMixin, forms.ModelForm):
	class Meta:
		model = Domain
		fields = ['name', 'nameservers', 'mnt_by', 'admin_c']

	def __init__(self, user, *args, **kwargs):
		self._user = user

		super(DomainForm, self).__init__(*args, **kwargs)

		instance = getattr(self, "instance", None)
		self._create = not (instance and instance.pk)

		if not self._create:
			self.fields['name'].disabled = True

	def clean_name(self):
		name = self.cleaned_data['name'].lower()
		if self._create:
			if not name.endswith("."):
				name += "."

			if not name.endswith("dn."):
				raise forms.ValidationError("Only .dn domains can be registered at this point")

			if name.count(".") > 2:
				raise forms.ValidationError("No subdomains can be registered")

			if not re.match("^[a-z0-9.-]+$", name):
				raise forms.ValidationError("Only a-z, 0-9 and - are allowed inside the domain name")

			try:
				Domain.objects.get(name=name)
				raise forms.ValidationError("Domain already exists")
			except Domain.DoesNotExist:
				pass

		return name


class NameserverForm(MntFormMixin, forms.ModelForm):
	class Meta:
		model = Nameserver
		fields = ['name', 'glueIPv4', 'glueIPv6', 'mnt_by', 'admin_c']

	def __init__(self, user, *args, **kwargs):
		self._user = user

		super(NameserverForm, self).__init__(*args, **kwargs)

		instance = getattr(self, "instance", None)
		self._create = not (instance and instance.pk)

	def clean_name(self):
		name = self.cleaned_data['name'].lower().strip()
		if not name.endswith("."):
			name += "."

		if name.count(".") <= 2:
			raise forms.ValidationError("Nameserver must be inside a domain (e.g. ns1.noot.dn.)")

		zone = ".".join(name.split(".")[-3:])

		mnts = self._user.maintainer_set.all()
		domains = Domain.objects.filter(mnt_by__in=mnts)
		found = False
		for domain in domains:
			if domain.name == zone:
				found = True
				break

		if not found:
			raise forms.ValidationError("This nameserver is not under a domain you control.")

		return name

	def clean(self):
		cleaned_data = super(NameserverForm, self).clean()

		return cleaned_data