import asyncio
import pytest
from app.services import strategy_config_service as scs


class _Boom:
    def __init__(self, counter):
        self.counter = counter

    async def __aenter__(self):
        self.counter.append(1)
        await asyncio.sleep(0.01)
        raise RuntimeError("db down")

    async def __aexit__(self, *a):
        return False


@pytest.mark.asyncio
async def test_inflight_guard_and_backoff(monkeypatch):
    calls = []
    monkeypatch.setattr(scs, "AsyncSessionLocal", lambda: _Boom(calls))
    svc = scs.StrategyConfigService()
    for _ in range(50):
        svc.get("X")
    await asyncio.sleep(0.1)
    assert len(calls) == 1
    for _ in range(50):
        svc.get("X")
    await asyncio.sleep(0.05)
    assert len(calls) == 1  # 실패 후 TTL 내 재시도 없음
    assert svc._consecutive_failures == 1
    assert svc.get_cache_health_v2()["stale_alarm"] is True


@pytest.mark.asyncio
async def test_stale_error_log(monkeypatch, caplog):
    monkeypatch.setattr(scs, "AsyncSessionLocal", lambda: _Boom([]))
    svc = scs.StrategyConfigService()
    svc._last_success_ts = scs.time.monotonic() - svc.STALE_ERROR_SEC - 1
    with caplog.at_level("ERROR"):
        await svc._refresh()
    assert any("낡음" in r.message for r in caplog.records)