from sqlalchemy import Column, Integer, Boolean, DateTime, ForeignKey, String
from sqlalchemy.orm import relationship
from sqlalchemy.sql import func
from app.database import Base

class Assignment(Base):
    __tablename__ = "assignments"
    id = Column(Integer, primary_key=True, index=True)
    schedule_id = Column(Integer, ForeignKey("mass_schedules.id"), nullable=False)
    asim_id = Column(Integer, ForeignKey("asim.id"), nullable=True)  # null = slot SR/non-asim
    position_number = Column(String(10), nullable=False)
    position_type_code = Column(String, ForeignKey("position_types.code"), nullable=False)
    is_override = Column(Boolean, default=False)
    notes = Column(String, nullable=True)
    created_at = Column(DateTime(timezone=True), server_default=func.now())
    schedule = relationship("MassSchedule", back_populates="assignments")
    asim = relationship("Asim", back_populates="assignments")
    position_type = relationship("PositionType")