from uuid import uuid4

from sqlalchemy import Column, DateTime, Float, ForeignKey, Integer, String, Text
from sqlalchemy.orm import relationship
from sqlalchemy.sql import func

from app.core.database import Base


class CartItem(Base):
    __tablename__ = "cart_items"

    id = Column(String(36), primary_key=True, default=lambda: str(uuid4()))
    user_id = Column(String(36), ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    product_id = Column(String(36), ForeignKey("products.id", ondelete="CASCADE"), nullable=False)
    quantity = Column(Integer, default=1, nullable=False)
    price_at_addition = Column(Float, nullable=False)  # Price when added to cart
    custom_properties = Column(Text, nullable=True)  # JSON string for custom product properties
    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(DateTime(timezone=True), onupdate=func.now())

    # Relationships
    user = relationship("User", back_populates="cart_items")
    product = relationship("Product", back_populates="cart_items")

    def __repr__(self):
        return f"<CartItem {self.id} for Product {self.product_id}>"

    @property
    def subtotal(self):
        """Calculate the subtotal for this cart item"""
        return self.price_at_addition * self.quantity