from django.db import models
from django.urls import reverse

from whoisdb.models import MntdObject, Contact, InetNum

# generally allow domains for .dn to be created
# allow owners of a subnet to create reverse dns record?


class Nameserver(MntdObject):
	handleSuffix = "NS"
	# dns name
	# ip address, if glue
	#	ipv4/ipv6 address?
	handle = None
	name = models.CharField(max_length=256, unique=True)
	glueIPv4 = models.GenericIPAddressField(protocol='IPv4', blank=True, null=True)
	glueIPv6 = models.GenericIPAddressField(protocol='IPv6', blank=True, null=True)

	admin_c = models.ManyToManyField(Contact)

	def get_absolute_url(self):
		return reverse("domains:nameserver-show", args=(self.name,))

	def __str__(self):
		return self.name


class Domain(MntdObject):
	handle = None
	handleSuffix = "DOM"
	name = models.CharField(max_length=67, unique=True, db_index=True)

	nameservers = models.ManyToManyField(Nameserver, blank=True)
	admin_c = models.ManyToManyField(Contact)

	def get_absolute_url(self):
		return reverse("domains:domain-show", args=(self.name,))

	def __str__(self):
		return self.name

	def getNoDeleteReasons(self):
		reasons = []

		nameservers = Nameserver.objects.filter(name__endswith="." + self.name)
		for ns in nameservers:
			reasons.append("Nameserver %s depends on this domain" % ns.name)

		return reasons

#class NameserverDomainAssignment(models.Model):
#	domain = models.ForeignKey(Domain)
#	nameserver = models.ForeignKey(Nameserver)
#
#	order = models.PositiveSmallIntegerField(default=0)


class ReverseZone(models.Model):
	parentNet = models.ForeignKey(InetNum)
	address = models.GenericIPAddressField(db_index=True)
	netmask = models.PositiveIntegerField()

	nameservers = models.ManyToManyField(Nameserver)


#class NameserverReverseZoneAssignment(models.Model):
#	reversezone = models.ForeignKey(ReverseZone)
#	nameserver = models.ForeignKey(Nameserver)
#
#	order = models.PositiveSmallIntegerField()