"""念念回音模型"""

from datetime import datetime

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

from app.database import Base


class MissEcho(Base):
    __tablename__ = "miss_echoes"

    id: Mapped[str] = mapped_column(String(36), primary_key=True)
    from_user_id: Mapped[str] = mapped_column(String(36), ForeignKey("users.id", ondelete="CASCADE"))
    to_user_id: Mapped[str] = mapped_column(String(36), ForeignKey("users.id", ondelete="CASCADE"))
    leaf_seed: Mapped[str] = mapped_column(String(32), nullable=False)  # 程序化叶子种子
    message: Mapped[str | None] = mapped_column(String(50), nullable=True)  # 可选附言
    delivered_online: Mapped[bool] = mapped_column(Boolean, default=False)  # 是否在线送达
    read_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=lambda: datetime.utcnow())

    from_user = relationship("User", foreign_keys=[from_user_id])
    to_user = relationship("User", foreign_keys=[to_user_id])