from sqlalchemy import Column, Integer, String, DateTime
from datetime import datetime
import pytz
from utils.auth import Base

class Coupon(Base):
    """
    SQLAlchemy model representing a coupon code entry in the database.

    Attributes:
        id (int): Primary key identifier.
        code (str): Unique coupon code string.
        usage_count (int): Number of times the coupon has been used.
        created_at (datetime): Timestamp of coupon creation (stored in Europe/Bratislava timezone).
        used_at (datetime | None): Timestamp of the last usage, nullable.
    """
    __tablename__ = "coupon_codes"
    id = Column(Integer, primary_key=True)
    code = Column(String, unique=True)
    usage_count = Column(Integer, default=0)
    created_at = Column(DateTime, default=lambda: datetime.now(pytz.timezone('Europe/Bratislava')))
    used_at = Column(DateTime, nullable=True)