"""信号编辑历史模型"""
from __future__ import annotations

from datetime import datetime
from typing import Optional

from sqlalchemy import BigInteger, ForeignKey, Integer, TEXT, TIMESTAMP, VARCHAR
from sqlalchemy.orm import Mapped, mapped_column

from .base import Base


class SignalEdit(Base):
    __tablename__ = "signal_edits"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    signal_id: Mapped[int] = mapped_column(
        BigInteger, ForeignKey("signals.id"), nullable=False, index=True
    )
    field: Mapped[str] = mapped_column(VARCHAR(80), nullable=False)
    old_value: Mapped[Optional[str]] = mapped_column(TEXT, nullable=True)
    new_value: Mapped[Optional[str]] = mapped_column(TEXT, nullable=True)
    edited_by: Mapped[Optional[int]] = mapped_column(BigInteger, ForeignKey("users.id"), nullable=True, index=True)
    edited_at: Mapped[Optional[datetime]] = mapped_column(TIMESTAMP, nullable=True)