from __future__ import annotations

import hashlib
from pathlib import Path

from app.utils.hashing import sha256_bytes, sha256_file


def test_sha256_bytes_matches_hashlib():
    data = b"legacyhub" * 1000
    assert sha256_bytes(data) == hashlib.sha256(data).hexdigest()


def test_sha256_file_streaming_matches_hashlib(tmp_path: Path):
    payload = b"\x01\x02\x03" * 5_000_000  # 15 MiB - exercises chunking
    target = tmp_path / "blob.bin"
    target.write_bytes(payload)
    assert sha256_file(target) == hashlib.sha256(payload).hexdigest()


def test_sha256_file_distinguishes_content(tmp_path: Path):
    a = tmp_path / "a.bin"
    b = tmp_path / "b.bin"
    a.write_bytes(b"alpha")
    b.write_bytes(b"beta")
    assert sha256_file(a) != sha256_file(b)