from django.db import models
from django.utils import timezone


class BaseModel(models.Model):

    class Meta:
        abstract = True


class DeactivatedQueryset(models.Manager):

    def get_queryset(self):
        queryset = super().get_queryset()
        return queryset.filter(deactivated_at__isnull=True)

    def allow_delete(self):
        super().delete()

    def delete(self):
        count = self.count()
        self.filter(deactivated_at__isnull=True).update(
            deactivated_at=timezone.now()
        )
        return (count, None)


class DeactivatedMixin(models.Model):
    deactivated_at = models.DateTimeField(null=True, blank=True, default=None)

    objects = DeactivatedQueryset()

    class Meta:
        abstract = True

    def allow_delete(self, using=None, keep_parents=False):
        super().delete(using=using, keep_parents=keep_parents)

    def delete(self, using=None, keep_parents=False):
        if not self.deactivated_at:
            self.deactivated_at = timezone.now()
            self.save()