"""하드닝 R4: /health 가 스윙·MDD·적응형·체결보정 상태를 degraded 로 반영한다."""
import pytest

from app import main as m


class _NoDbEngine:
    """실 DB 접속 금지 — 예외 발생형(§4.1). /health 는 DB 실패를 degraded 로 처리한다."""
    def connect(self):
        raise RuntimeError("test: real DB access blocked")


@pytest.fixture(autouse=True)
def _block_db_and_redis(monkeypatch):
    monkeypatch.setattr(m, "engine", _NoDbEngine())
    from app.core import redis as _redis
    monkeypatch.setattr(_redis, "get_redis", lambda: None)


def _patch_getters(monkeypatch, swing=None, mdd=None, age=0.0, fs=None):
    from app.services.swing import scheduler as sch, fill_sweep as fsw
    from app.services import adaptive_strategy as adp
    monkeypatch.setattr(sch, "get_swing_scheduler_health_v2", lambda: swing or {"degraded_reasons": []})
    monkeypatch.setattr(sch, "get_mdd_update_health", lambda: mdd or {"blind_block_active": False})
    monkeypatch.setattr(adp, "get_last_success_age_sec_v2", lambda: age)
    monkeypatch.setattr(fsw, "get_fill_sweep_health_v2", lambda: fs or {"exhausted": 0})


def test_clean(monkeypatch):
    _patch_getters(monkeypatch)
    _, reasons = m._runtime_health_v2(market_open=True)
    assert reasons == []


def test_swing_reasons_and_blind_block(monkeypatch):
    _patch_getters(monkeypatch, swing={"degraded_reasons": ["stuck_steps", "exit_stale"]},
                   mdd={"blind_block_active": True})
    _, reasons = m._runtime_health_v2(market_open=True)
    assert {"stuck_steps", "exit_stale", "mdd_blind_block"} <= set(reasons)


def test_adaptive_stale_only_in_market(monkeypatch):
    from app.services import adaptive_strategy as adp
    _patch_getters(monkeypatch, age=adp._STALE_LIMIT_SEC + 1)
    assert "adaptive_stale" in m._runtime_health_v2(market_open=True)[1]
    assert "adaptive_stale" not in m._runtime_health_v2(market_open=False)[1]


def test_getter_exception_is_degraded_not_crash(monkeypatch):
    from app.services.swing import scheduler as sch

    def boom():
        raise RuntimeError("x")
    _patch_getters(monkeypatch)
    monkeypatch.setattr(sch, "get_swing_scheduler_health_v2", boom)
    _, reasons = m._runtime_health_v2(market_open=True)
    assert "swing_health_unavailable" in reasons


@pytest.mark.asyncio
async def test_health_impl_degraded_on_dlq_manual_and_reasons(monkeypatch):
    from app.services import db_worker as w
    _patch_getters(monkeypatch, mdd={"blind_block_active": True})

    async def dlq():
        return {"pending": 0, "manual": 2, "expired": 0}
    monkeypatch.setattr(w, "dlq_status_counts", dlq)
    monkeypatch.setattr(m, "is_market_open", lambda: True)
    out = await m._health_check_impl()
    assert out["status"] == "degraded"
    assert "mdd_blind_block" in out["degraded_reasons"] and "dlq_manual" in out["degraded_reasons"]


def test_detail_endpoint_requires_api_key():
    route = [r for r in m.app.routes if getattr(r, "path", "") == "/health/detail"][0]
    assert route.dependant.dependencies


@pytest.mark.asyncio
async def test_health_impl_never_touches_real_engine(monkeypatch):
    """회귀: 실 engine 대신 차단 목이 쓰이고 db 실패는 degraded 로 귀결된다."""
    from app.services import db_worker as w
    _patch_getters(monkeypatch)

    async def dlq():
        return {"pending": 0, "manual": 0, "expired": 0}
    monkeypatch.setattr(w, "dlq_status_counts", dlq)
    monkeypatch.setattr(m, "is_market_open", lambda: True)
    out = await m._health_check_impl()
    assert out["status"] == "degraded"


def _patch_extra(monkeypatch, wh=None, bh=None, kh=None, rh=None):
    from app.services import db_worker as w, schedulers as sc, market_analyzer as ma
    monkeypatch.setattr(w, "get_worker_health_v2", lambda: wh or {"qsize": 0, "circuit_open": False, "last_success_ts": None})
    monkeypatch.setattr(sc, "get_batch_analysis_health_v2", lambda: bh or {"consecutive_failed_cycles": 0})
    monkeypatch.setattr(sc, "get_krx_data_health_v2", lambda: kh or {"ok": None})
    monkeypatch.setattr(ma, "get_regime_source_health", lambda: rh or {"blocked": False})


def test_db_circuit_and_write_stall(monkeypatch):
    import time
    _patch_getters(monkeypatch)
    _patch_extra(monkeypatch, wh={"qsize": 3, "circuit_open": True,
                                  "last_success_ts": time.time() - m._DB_WRITE_STALL_SEC - 10})
    _, reasons = m._runtime_health_v2(market_open=True)
    assert {"db_circuit_open", "db_write_stalled"} <= set(reasons)


def test_idle_queue_not_stalled(monkeypatch):
    import time
    _patch_getters(monkeypatch)
    _patch_extra(monkeypatch, wh={"qsize": 0, "circuit_open": False,
                                  "last_success_ts": time.time() - 99999})
    assert m._runtime_health_v2(market_open=True)[1] == []


def test_batch_krx_regime_reasons(monkeypatch):
    _patch_getters(monkeypatch)
    _patch_extra(monkeypatch,
                 bh={"consecutive_failed_cycles": m._BATCH_FAIL_CYCLES_DEGRADED},
                 kh={"ok": False}, rh={"blocked": True})
    _, reasons = m._runtime_health_v2(market_open=True)
    assert {"batch_analysis_failing", "krx_data_incomplete", "regime_blocked"} <= set(reasons)
    assert "regime_blocked" not in m._runtime_health_v2(market_open=False)[1]


def test_new_getter_exception_degraded(monkeypatch):
    from app.services import db_worker as w
    _patch_getters(monkeypatch)
    _patch_extra(monkeypatch)

    def boom():
        raise RuntimeError("x")
    monkeypatch.setattr(w, "get_worker_health_v2", boom)
    assert "db_worker_health_unavailable" in m._runtime_health_v2(market_open=True)[1]