"""loss_tracker 기동 복원 실패 fail-closed 회귀 (밴 소실 방지)."""
from datetime import datetime, timedelta, timezone
from types import SimpleNamespace
from unittest.mock import AsyncMock, patch

import pytest

from app.core.config import settings
import app.services.loss_tracker as lt
from app.services.loss_tracker import ConsecutiveLossTracker


def _t():
    return ConsecutiveLossTracker(
        ban_count=settings.CONSECUTIVE_LOSS_BAN_COUNT,
        ban_calendar_days=settings.CONSECUTIVE_LOSS_BAN_DAYS,
    )


class _FailDB:
    def __init__(self):
        self.calls = 0
        self.rollbacks = 0

    async def execute(self, *a, **k):
        self.calls += 1
        raise ConnectionError("db down")

    async def rollback(self):
        self.rollbacks += 1


class _OkDB:
    def __init__(self, recs):
        self.recs = recs

    async def execute(self, *a, **k):
        recs = self.recs
        return SimpleNamespace(scalars=lambda: SimpleNamespace(all=lambda: recs))

    async def rollback(self):
        pass


@pytest.fixture(autouse=True)
def _fast(monkeypatch):
    monkeypatch.setattr(lt, "_LOAD_RETRY_DELAYS", (0.0, 0.0))


@pytest.mark.asyncio
async def test_load_failure_retries_and_fails_closed():
    t = _t()
    db = _FailDB()
    notifier = SimpleNamespace(notify_system_warning=AsyncMock())
    with patch("app.services.telegram_notifier.telegram_notifier", notifier):
        await t.load_from_db(db)
    assert db.calls == 3 and db.rollbacks == 3
    assert t._load_failed is True
    assert t.is_banned("000270")  # 아무 종목이나 차단
    notifier.notify_system_warning.assert_awaited_once()


@pytest.mark.asyncio
async def test_save_deferred_while_failed_then_merged_on_success():
    t = _t()
    t._load_failed = True
    t.record_trade_result("000270", True)
    enq = AsyncMock()
    with patch("app.services.db_worker.enqueue_stock_ban_upsert", enq):
        await t.save_to_db(None, "000270")
        enq.assert_not_awaited()  # DB 밴 행 덮어쓰기 금지

        future = (datetime.now(timezone.utc) + timedelta(days=10)).replace(tzinfo=None)
        rec = SimpleNamespace(stock_code="000270", consecutive_losses=settings.CONSECUTIVE_LOSS_BAN_COUNT,
                              ban_until=future)
        await t.load_from_db(_OkDB([rec]))
    assert t._load_failed is False
    assert t.is_banned("000270")
    assert t._tracker["000270"]["consecutive_losses"] >= settings.CONSECUTIVE_LOSS_BAN_COUNT
    enq.assert_awaited_once()  # 병합된 값이 저장됨


@pytest.mark.asyncio
async def test_retry_skips_within_min_interval(monkeypatch):
    t = _t()
    t._load_failed = True
    import time
    t._last_load_attempt = time.monotonic()
    assert await t.retry_load_if_failed_v2() is False
    assert t._load_failed is True


def test_normal_tracker_unaffected():
    t = _t()
    assert t.is_banned("005930") is False


@pytest.mark.asyncio
async def test_is_banned_safe_does_not_block_on_slow_reload(monkeypatch):
    """진입 판정은 재복원을 기다리지 않고 즉시 fail-closed, 재복원은 단일 비행."""
    import asyncio
    import app.core.database as dbmod

    started = []
    release = asyncio.Event()

    class _SlowSession:
        async def __aenter__(self):
            started.append(1)
            await release.wait()  # DB 무응답
            raise ConnectionError("db down")

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

    monkeypatch.setattr(dbmod, "AsyncSessionLocal", lambda: _SlowSession())
    monkeypatch.setattr(lt, "_LOAD_RETRY_MIN_INTERVAL_SEC", 0.0)
    t = _t()
    t._load_failed = True
    r1 = await asyncio.wait_for(t.is_banned_safe("000270"), timeout=1.0)
    r2 = await asyncio.wait_for(t.is_banned_safe("005930"), timeout=1.0)
    assert r1 is True and r2 is True
    await asyncio.sleep(0)
    assert len(started) == 1  # 단일 비행
    release.set()
    await t._reload_task
    assert t._load_failed is True


@pytest.mark.asyncio
async def test_background_reload_has_timeout_cap(monkeypatch):
    import asyncio
    import app.core.database as dbmod

    class _HangSession:
        async def __aenter__(self):
            await asyncio.sleep(60)

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

    monkeypatch.setattr(dbmod, "AsyncSessionLocal", lambda: _HangSession())
    monkeypatch.setattr(lt, "_LOAD_RETRY_TASK_TIMEOUT_SEC", 0.05)
    t = _t()
    t._load_failed = True
    await asyncio.wait_for(t._reload_in_background_impl(), timeout=2.0)
    assert t._load_failed is True