"""通知模型 — 用于定时任务结果推送及系统通知"""
import uuid
from datetime import datetime
from sqlalchemy import Column, String, Text, DateTime, ForeignKey, Boolean
from sqlalchemy.dialects.mysql import CHAR
from app.core.database import Base


class Notification(Base):
    """系统通知 — 定时任务结果、告警、系统消息等"""
    __tablename__ = "notifications"

    id = Column(CHAR(36), primary_key=True, default=lambda: str(uuid.uuid4()))
    user_id = Column(CHAR(36), ForeignKey("users.id"), nullable=False, index=True, comment="接收用户 ID")
    title = Column(String(200), nullable=False, comment="通知标题")
    content = Column(Text, nullable=True, comment="通知正文")
    category = Column(String(32), default="system", comment="分类: schedule/alert/system")
    ref_type = Column(String(32), nullable=True, comment="关联对象类型: schedule/execution")
    ref_id = Column(String(36), nullable=True, comment="关联对象 ID")
    is_read = Column(Boolean, default=False, comment="是否已读")
    created_at = Column(DateTime, default=datetime.utcnow, comment="创建时间")

    def __repr__(self):
        return f"<Notification(id={self.id}, user_id={self.user_id}, title={self.title})>"