"""Полный доступный путь символы → CRC → стирания → видеокадр."""

from __future__ import annotations

import hashlib
import json

import numpy as np
import pytest

pytest.importorskip("numba")

from tools.video004_pipeline_benchmark import MANIFEST, SIGNAL, decode


def test_four_frames_exact_after_four_packet_erasures() -> None:
    manifest = json.loads(MANIFEST.read_text(encoding="utf-8"))
    received = np.load(SIGNAL, allow_pickle=False)
    assert hashlib.sha256(received.tobytes()).hexdigest() == manifest["signal_sha256"]
    result = decode(received, "numba")
    assert result["packet_sha256"] == manifest["expected_packet_sha256"]
    assert result["frame_sha256"] == manifest["expected_frame_sha256"]
    assert result["parity_recoveries"] == 4
    assert result["unrecoverable_blocks"] == 0