import os
import time
import pytest
from cache import get_cached, set_cached


@pytest.fixture
def tmp_cache(tmp_path, monkeypatch):
    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):
    assert get_cached('no_such_key') is None


def test_set_and_get_cached_roundtrip(tmp_cache):
    set_cached('my_key', {'a': 1})
    assert get_cached('my_key') == {'a': 1}


def test_get_cached_no_ttl_never_expires(tmp_cache):
    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):
    set_cached('k', 'fresh')
    assert get_cached('k', ttl=3600) == 'fresh'


def test_get_cached_expired_returns_none(tmp_cache):
    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