from django.db import models

from dncore.models import User
from .validators import HandleValidator, HandleValidatorWithSuffix


class WhoisObject(models.Model):
	class Meta:
		abstract = True
	handleSuffix = ""

	handle = models.SlugField(max_length=32, unique=True, verbose_name='handle', validators=[HandleValidator()])
	created = models.DateTimeField(auto_now_add=True)
	last_modified = models.DateTimeField(auto_now_add=True)

	def __str__(self):
		return self.handle

	def genHandle(self, main=None):
		if not main:
			main = self.name
		prefix = ""
		if " " in main:
			parts = main.split(" ")
			prefix = "".join(map(lambda _x: _x[0], parts))
			if len(prefix) < 3 and len(parts[-1]) > 1:
				prefix += parts[-1][1:4 - len(prefix)]
		else:
			prefix = main[0:3]
		prefix = prefix.upper()

		i = 1
		handle = "%s%%d-%s" % (prefix, self.handleSuffix)
		while True:
			try:
				prefix
				self.__class__.objects.get(handle=handle % i)
				i += 1
			except self.DoesNotExist:
				break

		return handle % i

	def handleAuto(self, name=None):
		if self.handle == "AUTO":
			self.handle = self.genHandle(name)


class Maintainer(WhoisObject):
	handleSuffix = "MNT"

	auth = models.ManyToManyField(User)
	handle = models.SlugField(max_length=32, unique=True, verbose_name='handle', validators=[HandleValidatorWithSuffix('MNT')])
	description = models.CharField(max_length=64, blank=True)

	admin_c = models.ManyToManyField("Contact")

	# autoInclude = models.BooleanField(default=True)



class MntdObject(WhoisObject):
	class Meta:
		abstract = True

	mnt_by = models.ManyToManyField(Maintainer)


class Contact(MntdObject):
	handleSuffix = "DN"
	TYPE = (('person', 'person'), ('role', 'role'))

	name = models.CharField(max_length=128)


class ASBlock(MntdObject):
	handleSuffix = "ASB"

	parent_block = models.ForeignKey("ASBlock", models.CASCADE, null=True, blank=True, default=None)
	description = models.CharField(max_length=64, blank=True)


class ASNumber(MntdObject):
	handleSuffix = "AS"

	number = models.PositiveIntegerField(unique=True, db_index=True)
	volatile = models.BooleanField(default=False)
	asblock = models.ForeignKey(ASBlock, models.CASCADE)
	description = models.CharField(max_length=64, blank=True)

	mnt_lower = models.ManyToManyField(Maintainer, related_name='lower_asnumber_set')


class InetNum(WhoisObject):
	handleSuffix = "NET"

	PROTO = (('ipv4', 'ipv4'), ('ipv6', 'ipv6'))
	protocol = models.CharField(max_length=4, choices=PROTO)
	netmask = models.PositiveIntegerField()
	parent_range = models.ForeignKey("InetNum", models.CASCADE, null=True, blank=True, default=None)
	description = models.CharField(max_length=64, blank=True)

	mnt_lower = models.ManyToManyField(Maintainer)