from __future__ import annotations

import json
from functools import lru_cache
from pathlib import Path

_CONFIG_PATH = Path(__file__).resolve().parents[2] / "config" / "scoring.json"


@lru_cache(maxsize=1)
def load_scoring_config() -> dict:
    try:
        with _CONFIG_PATH.open() as f:
            return json.load(f)
    except FileNotFoundError:
        raise FileNotFoundError(
            f"Scoring config not found: {_CONFIG_PATH}. "
            "Ensure config/scoring.json exists in the project root."
        ) from None
    except json.JSONDecodeError as exc:
        raise ValueError(f"Malformed scoring config at {_CONFIG_PATH}: {exc}") from exc