"""消息通知模型"""
from sqlalchemy import Column, Integer, String, Text, Boolean, DateTime, ForeignKey
from sqlalchemy.sql import func
from database import Base


class Notification(Base):
    __tablename__ = "notifications"

    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
    type = Column(String(20), nullable=False)  # like / comment / follow / system
    content = Column(Text, default="")
    related_id = Column(Integer, default=None)  # 关联的帖子/用户ID
    from_user_id = Column(Integer, ForeignKey("users.id"), default=None)  # 触发通知的用户
    is_read = Column(Boolean, default=False, index=True)
    created_at = Column(DateTime(timezone=True), server_default=func.now())