"""治理域模型：生成偏好（其余旧枢治理表随 M8 退役）。"""

from datetime import datetime

from sqlalchemy import Boolean, DateTime, Float, Integer, String

from app.core.config import settings
from sqlalchemy.orm import Mapped, mapped_column

from app.core.time import utc_now
from app.db.base import Base


class GenerationPreferences(Base):
    """生成参数偏好（模型网关 §4.3）。本地单用户单行，按 owner_scope 固定。"""

    __tablename__ = "generation_preferences"

    owner_scope: Mapped[str] = mapped_column(
        String(80), primary_key=True, default=settings.default_owner_scope
    )
    default_model_hint: Mapped[str] = mapped_column(String(120), nullable=False)
    temperature: Mapped[float] = mapped_column(Float, nullable=False, default=0.7)
    top_p: Mapped[float] = mapped_column(Float, nullable=False, default=1.0)
    max_output_tokens: Mapped[int] = mapped_column(Integer, nullable=False, default=4096)
    streaming: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), default=utc_now, onupdate=utc_now
    )