from sqlalchemy import String

from api.database import (Model, SurrogatePK, db,
                          Column, reference_col, relationship)
from api.target_exchange.models import TargetExchange


class Target(SurrogatePK, Model):
    __tablename__ = "target"
    name = Column(String(255), unique=True, nullable=False)
    routing_key = Column(String(255), nullable=False)
    target_exchange_id = reference_col(TargetExchange.__tablename__, nullable=False)
    exchange = relationship(TargetExchange.__name__, backref=db.backref("targets"))

    def __init__(self, **kwargs):
        super(Target, self).__init__(**kwargs)

    def __repr__(self):
        return f'<{Target.__name__}({self.id}):{self.routing_key!r}->{self.exchange.name!r}>'