from sqlalchemy import Column, Integer, DateTime, Boolean, String, JSON, func
from sqlalchemy.orm import declarative_mixin, declarative_base

Base = declarative_base()

@declarative_mixin
class CRUDMixin:
    id = Column(Integer, primary_key=True)
    created_at = Column(DateTime, default=func.now())
    updated_at = Column(DateTime, default=func.now(), onupdate=func.now())

    def as_dict(self):
        # Combine all columns from all inherited tables
        result = {}
        for cls in self.__class__.__mro__:
            if hasattr(cls, "__table__"):
                for column in cls.__table__.columns:
                    result[column.name] = getattr(self, column.name)
        return result

class Version(Base):
    __tablename__ = "versions"

    id = Column(Integer, primary_key=True)
    model_name = Column(String, nullable=False)
    object_id = Column(Integer, nullable=False)
    change_type = Column(String, nullable=False)
    data = Column(JSON, nullable=True)
    timestamp = Column(DateTime, default=func.now())

    actor = Column(String, nullable=True)
    meta = Column('metadata', JSON, nullable=True)