from django.db import models
from django_core.models.base import AbstractBaseModel
from django.utils.translation import gettext_lazy as _
from django.core.validators import MinValueValidator


class AdVariantModel(AbstractBaseModel):
    ad = models.ForeignKey("api.AdModel", on_delete=models.CASCADE, related_name="variants", verbose_name=_("Ad"))
    color = models.ForeignKey(
        "api.ColorModel", on_delete=models.CASCADE, verbose_name=_("Color"), null=True, blank=False
    )
    size = models.ForeignKey("api.SizeModel", on_delete=models.CASCADE, verbose_name=_("Size"), null=True, blank=False)
    is_available = models.BooleanField(_("Is Available"), default=True)
    price = models.DecimalField(_("Price"), max_digits=10, decimal_places=2, validators=[MinValueValidator(0)])
    stock_quantity = models.PositiveIntegerField(_("Stock Quantity"), default=0)

    def __str__(self):
        return f"{self.color} - {self.size}"

    class Meta:
        db_table = "ad_variant"
        verbose_name = _("Ad Variant")
        verbose_name_plural = _("Ad Variants")
        indexes = [
            models.Index(fields=["ad", "is_available"]),
        ]