from django.db import models

class Product(models.Model):
    name = models.CharField(max_length=200)
    description = models.TextField(blank=True)
    price = models.DecimalField(max_digits=10, decimal_places=2)
    currency = models.CharField(max_length=10, default="czk")
    stock = models.PositiveIntegerField(default=0)
    is_active = models.BooleanField(default=True)
    default_carrier = models.ForeignKey(
        "Carrier", on_delete=models.SET_NULL, null=True, blank=True, related_name="default_for_products"
    )
    created_at = models.DateTimeField(auto_now_add=True)

    @property
    def available(self):
        return self.is_active and self.stock > 0

    def __str__(self):
        return f"{self.name} ({self.price} {self.currency.upper()})"


# Dopravci a způsoby dopravy
from django.db import models

class Carrier(models.Model):
    name = models.CharField(max_length=100)  # název dopravce (Zásilkovna, Česká pošta…)
    base_price = models.DecimalField(max_digits=10, decimal_places=2, default=0)  # základní cena dopravy
    delivery_time = models.CharField(max_length=100, blank=True)  # např. "2–3 pracovní dny"
    is_active = models.BooleanField(default=True)

    # pole pro logo
    logo = models.ImageField(upload_to="carriers/", blank=True, null=True)

    # pole pro propojení s externím API (např. ID služby u Zásilkovny)
    external_id = models.CharField(max_length=50, blank=True, null=True)

    def __str__(self):
        return f"{self.name} ({self.base_price} Kč)"