from sqlalchemy import Column, Integer, DateTime, ForeignKey
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship

base = declarative_base()


class Step(base):
    __tablename__ = 'steps'

    id = Column(Integer, primary_key=True, autoincrement=True)
    start_deadline = Column(DateTime, nullable=False)
    finish_deadline = Column(DateTime, nullable=False)

    order_id = Column(Integer, ForeignKey('orders.id'))
    status_id = Column(Integer, ForeignKey('statuses.id'))

    order = relationship('Order', back_populates='steps')
    status = relationship('Status', back_populates='steps')

    deliveries = relationship('Delivery', back_populates='step')