"""Test patterns that can be used for assignment of mapped attributes
after the mapping is complete


"""
from typing import Optional

from sqlalchemy import Column
from sqlalchemy import ForeignKey
from sqlalchemy import inspect
from sqlalchemy import Integer
from sqlalchemy import select
from sqlalchemy import String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import column_property
from sqlalchemy.orm import Mapped
from sqlalchemy.orm import relationship

Base = declarative_base()


class B(Base):
    __tablename__ = "b"
    id = Column(Integer, primary_key=True)
    a_id: int = Column(ForeignKey("a.id"))

    # to attach attrs after the fact, declare them with Mapped
    # on the class...
    data: Mapped[str]

    a: Mapped[Optional["A"]]


class A(Base):
    __tablename__ = "a"

    id = Column(Integer, primary_key=True)
    data = Column(String)
    bs = relationship(B, uselist=True, back_populates="a")


# There's no way to intercept the __setattr__() from the metaclass
# here, and also when @reg.mapped() is used there is no metaclass.
# so have them do it the old way
inspect(B).add_property(
    "data",
    column_property(select(A.data).where(A.id == B.a_id).scalar_subquery()),
)
inspect(B).add_property("a", relationship(A))


# the constructor will pick them up
a1 = A()
b1 = B(data="b", a=a1)

# and it's mapped
B.data.in_(["x", "y"])
B.a.any()