from django.utils.translation import gettext_lazy as _

from django.db import models
from django.db.models import F

from rules.contrib.models import RulesModel
from outbo.apps.core.models import TimestampableDeletableMixin, SoftDeletableManager


class ProjectNumberManager(SoftDeletableManager):
    def get_next_number(self, prefix):
        current = self.get_or_create(prefix=prefix)[0]
        value = current.value

        current.value = F("value") + 1
        current.save()

        return value


class ProjectNumber(TimestampableDeletableMixin, RulesModel):
    objects = ProjectNumberManager()
    all_objects = ProjectNumberManager(alive_only=False)

    prefix = models.CharField(max_length=4)
    value = models.PositiveIntegerField(default=1)