from sqlalchemy import Column, Integer, String, ForeignKey, DateTime
from sqlalchemy.orm import relationship
from sqlalchemy.sql import func

from app.domain.models.base import BaseModel
from app.settings import settings


class Appointment(BaseModel):
    __tablename__ = 'appointments'
    __table_args__ = {"schema": settings.SCHEMA}

    results = Column(String)
    days_until_the_next_appointment = Column(Integer)
    appointment_datetime = Column(DateTime, nullable=False, server_default=func.now())

    patient_id = Column(Integer, ForeignKey(f'{settings.SCHEMA}.patients.id', ondelete='CASCADE'), nullable=False)
    doctor_id = Column(Integer, ForeignKey(f'{settings.SCHEMA}.users.id', ondelete='SET NULL'), nullable=True)
    type_id = Column(Integer, ForeignKey(f'{settings.SCHEMA}.appointment_types.id', ondelete='CASCADE'), nullable=False)

    patient = relationship('Patient', back_populates='appointments')
    doctor = relationship('User', back_populates='appointments')
    type = relationship('AppointmentType', back_populates='appointments')

    files = relationship('AppointmentFile', back_populates='appointment', cascade="all, delete")