#!/usr/bin/env python3
"""Fail-closed verifier for the Section 4.1.2 grid reproduction."""

from __future__ import annotations

import csv
import hashlib
import json
from pathlib import Path


ROOT = Path(__file__).resolve().parent
OUT = ROOT / "results" / "runtime_grid_v3"


def digest(path: Path) -> str:
    return hashlib.sha256(path.read_bytes()).hexdigest()


def main() -> None:
    summary = json.loads((OUT / "summary.json").read_text())
    hashes = json.loads((OUT / "sha256.json").read_text())
    rows = list(csv.DictReader((OUT / "full_grid_raw.csv").open()))
    assert summary["author_commit"] == "12fdd4775a3df694926bfabe45421aebaa281eb1"
    assert summary["grid_points_per_replicate"] == 168
    assert summary["total_independent_grid_points"] == 840
    assert len(rows) == 840
    assert summary["grid_wide_median_iterations"] == 3.0
    assert all(item["median_iterations"] == 3.0 for item in summary["per_replicate"])
    assert summary["highlight_n_1e6_k_1e5"]["median_runtime_ms"] < 200.0
    for name, expected in hashes.items():
        assert digest(OUT / name) == expected
    print(
        "PASS: 5 complete 168-point grids (840 independent problems); "
        "median=3 updates in every replicate and n=1e6/k=1e5 median runtime<200 ms "
        f"(observed grid maximum={summary['grid_wide_max_iterations']}, reported maximum=6)"
    )


if __name__ == "__main__":
    main()