from __future__ import annotations

from dataclasses import dataclass
from pathlib import Path
from typing import Iterable, List


@dataclass(frozen=True)
class ReuseCheck:
    ok: bool
    missing: List[str]
    note: str


def validate_reuse_inputs(required_paths: Iterable[Path]) -> ReuseCheck:
    missing = [str(p) for p in required_paths if not Path(p).exists()]
    if missing:
        return ReuseCheck(ok=False, missing=missing, note="missing_required_reuse_inputs")
    return ReuseCheck(ok=True, missing=[], note="reuse_inputs_available")