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


class Department(Base):
    __tablename__ = "pjctrl_departments"

    id = Column(String(36), primary_key=True, default=lambda: str(uuid.uuid4()))
    name = Column(String(100), nullable=False)
    parent_id = Column(String(36), ForeignKey("pjctrl_departments.id"), nullable=True)
    created_at = Column(DateTime, server_default=func.now())

    # Self-referential relationship
    parent = relationship("Department", remote_side=[id], backref="children")