from django.db import models
from users.models import User
from menu.models import MenuItem

class Order(models.Model):

    STATUS_CHOICES = (
        ('PENDING', 'Pending'),
        ('PREPARING', 'Preparing'),
        ('READY', 'Ready'),
        ('OUT', 'Out for delivery'),
        ('DELIVERED', 'Delivered'),
    )

    ORDER_TYPE_CHOICES = (
        ('ORDER', 'Pickup'),
        ('DELIVERY', 'Delivery'),
    )

    order_type = models.CharField(
        max_length=20,
        choices=ORDER_TYPE_CHOICES,
        default='ORDER'
    )

    is_favorite = models.BooleanField(default=False)

    customer = models.ForeignKey(User, on_delete=models.CASCADE)

    status = models.CharField(
        max_length=20,
        choices=STATUS_CHOICES,
        default='PENDING'
    )

    # 🔥 NEW FIELDS
    items_total = models.DecimalField(max_digits=10, decimal_places=2, default=0)
    order_fee = models.DecimalField(max_digits=10, decimal_places=2, default=0)
    delivery_fee = models.DecimalField(max_digits=10, decimal_places=2, default=0)

    total_amount = models.DecimalField(max_digits=10, decimal_places=2, default=0)

    created_at = models.DateTimeField(auto_now_add=True)

    def save(self, *args, **kwargs):
        if not self.pk:
            self.status = 'PENDING'
        super().save(*args, **kwargs)


class OrderItem(models.Model):
    order = models.ForeignKey(Order, related_name='items', on_delete=models.CASCADE)
    menu_item = models.ForeignKey(MenuItem, on_delete=models.CASCADE)
    quantity = models.IntegerField()
    subtotal = models.DecimalField(max_digits=10, decimal_places=2)


from django.conf import settings


User = settings.AUTH_USER_MODEL


class Cart(models.Model):
    customer = models.OneToOneField(User, on_delete=models.CASCADE)

    @property
    def total_price(self):
        return sum(item.subtotal for item in self.items.all())

    def __str__(self):
        return f"{self.customer.username} Cart"


class CartItem(models.Model):
    cart = models.ForeignKey(
        Cart,
        related_name="items",
        on_delete=models.CASCADE
    )
    menu_item = models.ForeignKey(MenuItem, on_delete=models.CASCADE)
    quantity = models.PositiveIntegerField(default=1)

    @property
    def subtotal(self):
        return self.menu_item.price * self.quantity

    class Meta:
        unique_together = ('cart', 'menu_item')