"""LLM 模块共享工具函数。"""
from __future__ import annotations


def actual_1x2(home: int, away: int) -> str:
    """实际比分 → 胜平负。

    单一权威源: backtest.py 和 eval.py 共用,避免重复定义。
    """
    if home > away:
        return "1"
    if home == away:
        return "X"
    return "2"


def is_correct_1x2(pred: str | None, actual: str) -> bool:
    """预测是否命中胜平负。"""
    return pred == actual