import os
import time
from pathlib import Path
from typing import Any

import pytest
from cache import get_cached, set_cached


@pytest.fixture
def tmp_cache(tmp_path: Path, monkeypatch: Any) -> Path:
    import cache as cache_module

    monkeypatch.setattr(cache_module, "CACHE_DIR", str(tmp_path))
    return tmp_path


def test_get_cached_returns_none_for_missing_key(tmp_cache: Path) -> None:
    assert get_cached("no_such_key") is None


def test_set_and_get_cached_roundtrip(tmp_cache: Path) -> None:
    set_cached("my_key", {"a": 1})
    assert get_cached("my_key") == {"a": 1}


def test_get_cached_no_ttl_never_expires(tmp_cache: Path) -> None:
    set_cached("k", [1, 2, 3])
    # Backdate the file by 2 days
    path = tmp_cache / "k.json"
    old = time.time() - 2 * 86400
    os.utime(path, (old, old))
    assert get_cached("k") == [1, 2, 3]


def test_get_cached_within_ttl(tmp_cache: Path) -> None:
    set_cached("k", "fresh")
    assert get_cached("k", ttl=3600) == "fresh"


def test_get_cached_expired_returns_none(tmp_cache: Path) -> None:
    set_cached("k", "stale")
    path = tmp_cache / "k.json"
    old = time.time() - 25 * 3600  # 25 hours ago
    os.utime(path, (old, old))
    assert get_cached("k", ttl=24 * 3600) is None


def test_get_cached_invalid_json_returns_none(tmp_cache: Path) -> None:
    path = tmp_cache / "broken.json"
    path.write_text('{"not": "finished"')

    assert get_cached("broken") is None