"""Tests for the best-effort API cache invalidation signal."""

from __future__ import annotations

import sys

import opengoods.cache as cache


def test_disabled_when_no_url(monkeypatch):
    monkeypatch.delenv("OPENGOODS_REDIS_URL", raising=False)
    assert cache.default_redis_url() is None
    assert cache.bump_cache_epoch() is False


def test_bump_fails_open_when_unreachable(monkeypatch):
    # An unroutable URL must not raise; the run still succeeds.
    monkeypatch.setenv("OPENGOODS_REDIS_URL", "redis://127.0.0.1:1/0")
    assert cache.bump_cache_epoch() is False


def test_bump_increments_epoch(monkeypatch):
    calls = {}

    class FakeClient:
        def incr(self, key):
            calls["key"] = key
            return 7

        def close(self):
            calls["closed"] = True

    class FakeRedis:
        @staticmethod
        def from_url(url, **kwargs):
            calls["url"] = url
            return FakeClient()

    monkeypatch.setitem(sys.modules, "redis", type("M", (), {"Redis": FakeRedis}))

    assert cache.bump_cache_epoch("redis://example:6379/0") is True
    assert calls["key"] == "og:cache:epoch"
    assert calls["url"] == "redis://example:6379/0"
    assert calls["closed"] is True