"""ORM model for exact-match, administrator-managed fixed questions."""

from __future__ import annotations

from datetime import UTC, datetime

from sqlalchemy import Boolean, Integer, String, Text, UniqueConstraint
from sqlalchemy.orm import Mapped, mapped_column

from deerflow.persistence.base import Base
from deerflow.persistence.types import BeijingDateTime, PortableLongText


class FixedQuestionRow(Base):
    """One globally shared question/answer pair.

    ``question_hash`` provides a portable indexed lookup for questions stored in
    ``Text``. The repository always compares the original question as well, so a
    theoretical SHA-256 collision cannot cause a false match.
    """

    __tablename__ = "fixed_questions"
    __table_args__ = (UniqueConstraint("question_hash", name="uq_fixed_questions_question_hash"),)

    id: Mapped[str] = mapped_column(String(64), primary_key=True)
    question: Mapped[str] = mapped_column(Text, nullable=False)
    question_hash: Mapped[str] = mapped_column(String(64), nullable=False, index=True)
    answer: Mapped[str] = mapped_column(PortableLongText, nullable=False)
    enabled: Mapped[bool] = mapped_column(Boolean, default=True, server_default="1")
    tokens_per_second: Mapped[int] = mapped_column(
        Integer,
        default=100,
        server_default="100",
    )
    sort_order: Mapped[int] = mapped_column(Integer, default=0, server_default="0")
    updated_by: Mapped[str | None] = mapped_column(String(64), nullable=True)
    updated_at: Mapped[datetime] = mapped_column(
        BeijingDateTime(),
        default=lambda: datetime.now(UTC),
        onupdate=lambda: datetime.now(UTC),
    )