from sqlalchemy import Column, Integer, ForeignKey
from sqlalchemy.orm import relationship, foreign, remote

from crudkit.core.base import CRUDMixin

from muck.models.dbref import Dbref, ObjectType

class Thing(Dbref):
    __tablename__ = "things"

    id = Column(Integer, ForeignKey("dbref.id"), primary_key=True)

    value = Column(Integer, nullable=False, default=0)

    home_id = Column(Integer, ForeignKey("dbref.id"), nullable=True)
    home = relationship("Dbref", remote_side=[CRUDMixin.id], foreign_keys=[home_id], primaryjoin=lambda: foreign(Thing.home_id) == remote(Dbref.id))

    __mapper_args__ = {
        "polymorphic_identity": ObjectType.THING,
        "inherit_condition": id == Dbref.id
    }