import uuid

from django.db import models, transaction
from django.utils.translation import gettext_lazy as _

from wireguard.models import WireGuardInstance


class RoutingTemplate(models.Model):
    ROUTE_TYPE_CHOICES = [
        ("default", _('Default Route (0.0.0.0/0)')),
        ("peer_same_instance", _('Routes from Peers on same Interface')),
        ("peer_all_instances", _('Routes from All Peers')),
        ("custom", _('Custom Routes')),
    ]

    wireguard_instance = models.ForeignKey(WireGuardInstance, on_delete=models.CASCADE)
    default_template = models.BooleanField(default=False)

    name = models.CharField(max_length=32)
    route_type = models.CharField(max_length=20, choices=ROUTE_TYPE_CHOICES)

    custom_routes = models.TextField(blank=True, null=True, help_text=_('One route per line in CIDR notation.'))
    allow_peer_custom_routes = models.BooleanField(default=False)

    uuid = models.UUIDField(default=uuid.uuid4, editable=False, unique=True)
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)

    class Meta:
        unique_together = (("wireguard_instance", "name"),)

    def __str__(self):
        return self.name

    def save(self, *args, **kwargs):
        with transaction.atomic():
            super().save(*args, **kwargs)
            if self.default_template:
                (
                    RoutingTemplate.objects
                    .filter(wireguard_instance=self.wireguard_instance, default_template=True)
                    .exclude(pk=self.pk)
                    .update(default_template=False)
                )