"""하드닝 루프 R2 (2026-10-09) — mean_reversion_strategy BEAR v2 회귀 테스트.

1. BEAR v2 진입 description 에 f-string `%%B` 리터럴이 남아 저널·ML 텍스트에 '%%B' 로 기록되던 결함.
2. MEAN_REVERSION_BEAR_V2_ENABLED 가 실전 진입 경로에 배선되어 있지 않다는 사실(백테스트 전용)을
   고정한다. 누군가 실전 경로에 배선하면 이 테스트가 깨져 문서(docstring·config·CLAUDE.md §6.1)
   갱신을 강제한다.
"""
import ast
import os
import re
from unittest.mock import MagicMock, patch

import pytest

from app.core.config import settings
import app.services.mean_reversion_strategy as mrs

BACKEND_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))


@pytest.fixture(autouse=True)
def _cfg_none():
    """strategy_cfg(DB) 를 비워 settings 값으로 폴백시킨다(테스트 시점 바인딩)."""
    _m = MagicMock()
    _m.get.side_effect = lambda key, default=None: None
    with patch.object(mrs, "strategy_cfg", _m):
        yield


def _full_score_signal():
    bear_thr = settings.MEAN_REVERSION_BEAR_RSI_THRESHOLD
    rsi = min(bear_thr, settings.MEAN_REVERSION_RSI_STRONG_THRESHOLD) - 5.0
    avg_vol = 1_000_000
    cur_vol = int(avg_vol * (settings.MEAN_REVERSION_BEAR_VOLUME_MULT + 1.0))
    return mrs.check_bear_buy_signal_v2(
        rsi=rsi,
        close=10_100.0,  # %B = 0.05
        bb_upper=12_000.0,
        bb_lower=10_000.0,
        avg_volume_20d=avg_vol,
        current_volume=cur_vol,
        is_reversal=True,
        rsi_prev=rsi - 2.0,
        bear_rsi_threshold=bear_thr,
    )


def test_bear_v2_description_has_single_percent_b():
    sig = _full_score_signal()
    assert sig is not None, "만점 입력에서 BEAR v2 신호가 나야 한다"
    desc = sig["description"]
    assert "%%B" not in desc
    assert re.search(r"\+ %B\(0\.05/", desc), desc


def _calls_in(path, names):
    with open(path, encoding="utf-8") as f:
        tree = ast.parse(f.read())
    hits = []
    for node in ast.walk(tree):
        if isinstance(node, ast.Call):
            fn = node.func
            nm = fn.id if isinstance(fn, ast.Name) else (fn.attr if isinstance(fn, ast.Attribute) else None)
            if nm in names:
                hits.append(nm)
    return hits


def test_bear_v2_is_backtest_only():
    """check_buy_signal / check_bear_buy_signal_v2 의 실전 호출부가 없음을 고정한다."""
    allowed = {
        os.path.join(BACKEND_DIR, "app", "services", "mean_reversion_strategy.py"),
        os.path.join(BACKEND_DIR, "app", "services", "kr_backtest_engine.py"),
        os.path.join(BACKEND_DIR, "run_backtest.py"),
    }
    names = {"check_buy_signal", "check_bear_buy_signal_v2", "_bear_v2_enabled"}
    offenders = []
    for root, dirs, files in os.walk(BACKEND_DIR):
        dirs[:] = [d for d in dirs if d not in ("tests", ".venv", "venv", "__pycache__", "node_modules")]
        for fn in files:
            if not fn.endswith(".py"):
                continue
            p = os.path.join(root, fn)
            if p in allowed:
                continue
            try:
                hits = _calls_in(p, names)
            except SyntaxError:
                continue
            if hits:
                offenders.append((os.path.relpath(p, BACKEND_DIR), hits))
    assert not offenders, (
        f"BEAR v2/check_buy_signal 이 실전 경로에 배선됨: {offenders} — "
        "mean_reversion_strategy docstring·config 주석·CLAUDE.md §6.1 '백테스트 전용' 서술을 갱신할 것"
    )
    # 문서가 사실과 일치하는지
    assert "백테스트 전용" in (mrs.check_bear_buy_signal_v2.__doc__ or "")


def test_recommendations_bear_branch_ignores_v2_flag():
    p = os.path.join(BACKEND_DIR, "app", "api", "endpoints", "recommendations.py")
    with open(p, encoding="utf-8") as f:
        src = f.read()
    assert "MEAN_REVERSION_BEAR_V2" not in src
    assert "check_bear_buy_signal_v2" not in src