from sqlalchemy import Column, DateTime, ForeignKey, String, text
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.sql import func
from backend.app.db.base import Base


class Department(Base):
    __tablename__ = "departments"

    id = Column(UUID(as_uuid=True), primary_key=True, server_default=text("gen_random_uuid()"))
    campus_id = Column(UUID(as_uuid=True), ForeignKey("campuses.id", ondelete="RESTRICT"), nullable=False)
    name = Column(String, nullable=False)
    external_dept_id = Column(String, unique=True)
    created_at = Column(DateTime(timezone=True), server_default=func.now(), nullable=False)
    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now(), nullable=False)