from __future__ import annotations

from sqlalchemy import Boolean, ForeignKey, Integer, String
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.db.base import Base
from app.models.mixins import TimestampMixin


class Department(TimestampMixin, Base):
    """科室模型：维护病例、知识库和评分规则的科室分类。"""

    __tablename__ = "departments"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    name: Mapped[str] = mapped_column(String(100), nullable=False)
    code: Mapped[str] = mapped_column(String(50), nullable=False, unique=True, index=True)
    parent_id: Mapped[int | None] = mapped_column(ForeignKey("departments.id"), nullable=True)
    sort_order: Mapped[int] = mapped_column(Integer, default=0)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True)

    parent: Mapped["Department | None"] = relationship(remote_side=[id])