import uuid
from sqlalchemy import Column, String, Text, DateTime
from sqlalchemy.orm import relationship
from utils.utils import Base, utc_now


class Department(Base):
    __tablename__ = "departments"

    id = Column(String(36), primary_key=True, default=lambda: str(uuid.uuid4()))
    name = Column(String(100), nullable=False, unique=True, index=True)
    description = Column(Text, nullable=True)
    created_at = Column(DateTime(timezone=True), default=utc_now, nullable=False)
    updated_at = Column(DateTime(timezone=True), default=utc_now, onupdate=utc_now, nullable=False)

    users = relationship("User", back_populates="department")
    appointments = relationship("Appointment", back_populates="department")
    services = relationship("Service", back_populates="department")