import ulid
from sqlalchemy import Column, String, DateTime, JSON, Text
from sqlalchemy.sql import func
from app.core.database.db_session import Base

class Cart(Base):
    __tablename__ = "carts"

    cart_id = Column(String(26), primary_key=True, default=lambda: str(ulid.new()))
    customer_id = Column(String(26), unique=True, nullable=True, index=True)
    visitor_id = Column(String(64), unique=True, nullable=True, index=True)
    items_json = Column(JSON, nullable=True) # [{variant_id, qty, unit_price}]
    coupon_code = Column(String(50), nullable=True)
    expires_at = Column(DateTime, nullable=True)
    created_at = Column(DateTime, server_default=func.now())
    updated_at = Column(DateTime, server_default=func.now(), onupdate=func.now())