"""Stockage versionne des prompts. Un prompt est du code : il se diffe,
il se relit, il se rejoue."""

from dataclasses import dataclass


@dataclass
class Pin:
    """Un score d'eval fige a une version donnee."""
    version: str
    score: float


class Vault:
    def save(self, name: str, body: str, *, force: bool = False, reason: str = "") -> str:
        """Enregistre une version. Refuse si le score passe sous le pin.

        Un prompt qui se degrade en silence est la panne la plus chere a
        diagnostiquer : mieux vaut bloquer et expliquer.
        """
        pin = self._pins.get(name)
        score = self._evaluate(name, body)

        if pin and score < pin.score and not force:
            raise ScoreRegression(
                f"{name}: {score:.3f} < pinned {pin.score:.3f}. "
                f"pass force=True with a reason to override."
            )

        if force and not reason:
            raise ValueError("forcing a regression requires a reason, it lands in the log")

        return self._write(name, body, score=score, forced=force, reason=reason)