import datetime as dt
from sqlalchemy import Column, Integer, DateTime, Boolean
from sqlalchemy.orm import declared_attr
from sqlalchemy.ext.hybrid import hybrid_property

class CrudMixin:
    id = Column(Integer, primary_key=True)
    created_at = Column(DateTime, default=dt.datetime.utcnow, nullable=False)
    updated_at = Column(DateTime, default=dt.datetime.utcnow, onupdate=dt.datetime.utcnow, nullable=False)
    deleted = Column("deleted", Boolean, default=False, nullable=False)
    version = Column(Integer, default=1, nullable=False)

    @hybrid_property
    def is_deleted(self):
        return self.deleted

    def mark_deleted(self):
        self.deleted = True
        self.version += 1

    @declared_attr
    def __mapper_args__(cls):
        return {"version_id_col": cls.version}