import devplacepy.cache as cache_mod
from devplacepy.cache import TTLCache


class FakeClock:
    def __init__(self, start=1000.0):
        self.now = start

    def time(self):
        return self.now


def test_get_miss_returns_none():
    cache = TTLCache(ttl=60)
    assert cache.get("absent") is None


def test_set_and_get_round_trip():
    cache = TTLCache(ttl=60)
    cache.set("key", "value")
    assert cache.get("key") == "value"


def test_entry_expires_after_ttl(monkeypatch):
    clock = FakeClock()
    monkeypatch.setattr(cache_mod, "time", clock)
    cache = TTLCache(ttl=10)
    cache.set("key", "value")
    clock.now += 11
    assert cache.get("key") is None


def test_lru_evicts_oldest_when_over_max_size():
    cache = TTLCache(ttl=60, max_size=2)
    cache.set("a", 1)
    cache.set("b", 2)
    cache.set("c", 3)
    assert cache.get("a") is None
    assert cache.get("b") == 2
    assert cache.get("c") == 3


def test_get_promotes_recency():
    cache = TTLCache(ttl=60, max_size=2)
    cache.set("a", 1)
    cache.set("b", 2)
    cache.get("a")
    cache.set("c", 3)
    assert cache.get("a") == 1
    assert cache.get("b") is None
    assert cache.get("c") == 3


def test_pop_removes_entry():
    cache = TTLCache(ttl=60)
    cache.set("key", "value")
    cache.pop("key")
    assert cache.get("key") is None


def test_pop_missing_key_is_noop():
    cache = TTLCache(ttl=60)
    cache.pop("absent")


def test_clear_empties_cache():
    cache = TTLCache(ttl=60)
    cache.set("a", 1)
    cache.set("b", 2)
    cache.clear()
    assert cache.get("a") is None
    assert cache.get("b") is None


def test_items_excludes_expired_entries(monkeypatch):
    clock = FakeClock()
    monkeypatch.setattr(cache_mod, "time", clock)
    cache = TTLCache(ttl=10)
    cache.set("old", 1)
    clock.now += 5
    cache.set("fresh", 2)
    clock.now += 7
    items = dict(cache.items())
    assert "old" not in items
    assert items["fresh"] == 2