from __future__ import annotations

from datetime import datetime
from typing import Optional

from sqlalchemy import DateTime, String, Text, UniqueConstraint, text
from sqlalchemy.dialects.mysql import BIGINT
from sqlalchemy.orm import Mapped, mapped_column

from backend.db.base import Base


class Setting(Base):
    __tablename__ = "settings"
    __table_args__ = (UniqueConstraint("k", name="uniq_settings_key"),)

    id: Mapped[int] = mapped_column(BIGINT(unsigned=True), primary_key=True, autoincrement=True)
    k: Mapped[str] = mapped_column(String(128), nullable=False)
    v: Mapped[Optional[str]] = mapped_column(Text)
    description: Mapped[Optional[str]] = mapped_column(String(255))
    updated_at: Mapped[datetime] = mapped_column(
        DateTime, server_default=text("CURRENT_TIMESTAMP"), onupdate=text("CURRENT_TIMESTAMP"), nullable=False
    )