#!/usr/bin/env python3
"""Check determinism by verifying manifest digests match stored values."""
from __future__ import annotations

import hashlib
import json
import sys
from pathlib import Path

ROOT = Path(__file__).resolve().parents[2]
MANIFEST = ROOT / "bench" / "golden-corpus" / "corpus-manifest.json"


def sha256(path: Path) -> str:
    h = hashlib.sha256()
    with path.open("rb") as fh:
        while True:
            chunk = fh.read(8192)
            if not chunk:
                break
            h.update(chunk)
    return h.hexdigest()


def main() -> int:
    if not MANIFEST.exists():
        print(f"Manifest not found: {MANIFEST}")
        return 1

    data = json.loads(MANIFEST.read_text(encoding="utf-8"))
    mismatches = []
    for case in data.get("cases", []):
        path = ROOT / case["path"]
        manifest_path = path / "case-manifest.json"
        digest = f"sha256:{sha256(manifest_path)}"
        if digest != case.get("manifestDigest"):
            mismatches.append({"id": case.get("id"), "expected": case.get("manifestDigest"), "actual": digest})

    if mismatches:
        print(json.dumps({"status": "fail", "mismatches": mismatches}, indent=2))
        return 1

    print(json.dumps({"status": "ok", "checked": len(data.get("cases", []))}, indent=2))
    return 0


if __name__ == "__main__":
    raise SystemExit(main())