from datetime import datetime

from sqlalchemy import Column, DateTime, Integer
from sqlalchemy.ext.declarative import declared_attr
from sqlalchemy.orm import DeclarativeBase


class Base(DeclarativeBase):
    """Base class for SQLAlchemy models."""

    @declared_attr.directive
    def __tablename__(cls) -> str:
        return cls.__name__.lower()

    id = Column(Integer, primary_key=True, index=True)
    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
    updated_at = Column(
        DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False
    )