# -*- coding: utf-8 -*-
"""本体场景模型

本模块定义本体场景的数据模型。

Classes:
    OntologyScene: 本体场景表模型
"""

import datetime
import uuid
from sqlalchemy import Column, String, DateTime, Integer, Text, ForeignKey, UniqueConstraint, Boolean
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import relationship
from app.db import Base


class OntologyScene(Base):
    """本体场景表 - 用于存储本体场景下不同的类型信息"""
    __tablename__ = "ontology_scene"
    __table_args__ = (
        UniqueConstraint('workspace_id', 'scene_name', name='uq_workspace_scene_name'),
    )

    # 主键
    scene_id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4, index=True, comment="场景ID")

    # 场景信息
    scene_name = Column(String(200), nullable=False, comment="场景名称")
    scene_description = Column(Text, nullable=True, comment="场景描述")
    
    # 系统默认标识
    is_system_default = Column(Boolean, default=False, nullable=False, index=True, comment="是否为系统默认场景")

    # 外键：关联到工作空间
    workspace_id = Column(UUID(as_uuid=True), ForeignKey("workspaces.id", ondelete="CASCADE"), nullable=False, index=True, comment="所属工作空间ID")

    # 时间戳
    created_at = Column(DateTime, default=datetime.datetime.now, nullable=False, comment="创建时间")
    updated_at = Column(DateTime, default=datetime.datetime.now, onupdate=datetime.datetime.now, nullable=False, comment="更新时间")

    # 关系：一个场景可以有多个类型
    classes = relationship("OntologyClass", back_populates="scene", cascade="all, delete-orphan")

    def __repr__(self):
        return f"<OntologyScene(id={self.scene_id}, name={self.scene_name})>"