"""
risk/manager.py
리스크 매니저 L1~L5
기획서 v2.1 기준
"""
import logging
from app.config import (
    SL_PCT, DAILY_SL_PCT, CONSEC_LOSS,
    AI_RISK_SL_MAP, POS_SIZE_PCT, MAX_POSITIONS
)

logger = logging.getLogger(__name__)

class RiskManager:
    def __init__(self, init_cash: float):
        self.init_cash     = init_cash
        self.daily_pnl     = 0.0
        self.weekly_pnl    = 0.0
        self.monthly_pnl   = 0.0
        self.consec_loss   = 0
        self.trading_stopped = False
        self.stop_reason   = ""
        self.risk_level    = "보통"

    def set_risk_level(self, level: str):
        """AI 판단 결과로 risk_level 설정"""
        self.risk_level = level

    def get_sl_pct(self) -> float:
        """현재 risk_level에 따른 손절 비율 반환"""
        return AI_RISK_SL_MAP.get(self.risk_level, SL_PCT)

    def get_pos_size(self, cash: float, multiplier: float = 1.0) -> float:
        """포지션 사이즈 계산 (AI multiplier 반영)"""
        return cash * POS_SIZE_PCT * multiplier

    # ── 손실 기록 ──

    def record_trade(self, pnl: float):
        """매매 결과 기록 및 손실 한도 체크"""
        self.daily_pnl   += pnl
        self.weekly_pnl  += pnl
        self.monthly_pnl += pnl

        if pnl < 0:
            self.consec_loss += 1
        else:
            self.consec_loss = 0

        self._check_limits()

    def _check_limits(self):
        """L1~L5 손실 한도 체크"""
        # L2: 일일 누적 손실 -3%
        if self.daily_pnl / self.init_cash < -DAILY_SL_PCT:
            self._stop("L2", f"일일 손실 {self.daily_pnl/self.init_cash*100:.1f}% 도달")

        # L3: 연속 손절 3회
        if self.consec_loss >= CONSEC_LOSS:
            self._stop("L3", f"{CONSEC_LOSS}연속 손절 발생")

        # L4: 주간 누적 -7%
        if self.weekly_pnl / self.init_cash < -0.07:
            self._stop("L4", f"주간 손실 {self.weekly_pnl/self.init_cash*100:.1f}%")

        # L5: 월간 누적 -15%
        if self.monthly_pnl / self.init_cash < -0.15:
            self._stop("L5", f"월간 손실 {self.monthly_pnl/self.init_cash*100:.1f}%")

    def _stop(self, level: str, reason: str):
        self.trading_stopped = True
        self.stop_reason     = f"{level}: {reason}"
        logger.warning(f"매매 중단 - {self.stop_reason}")

    # ── 상태 조회 ──

    def can_trade(self) -> bool:
        return not self.trading_stopped

    def can_add_position(self, current_positions: int) -> bool:
        return (not self.trading_stopped
                and current_positions < MAX_POSITIONS)

    def reset_daily(self):
        """매일 장 시작 전 일일 손익 초기화"""
        self.daily_pnl     = 0.0
        self.consec_loss   = 0
        self.trading_stopped = False
        self.stop_reason   = ""

    def reset_weekly(self):
        self.weekly_pnl = 0.0

    def reset_monthly(self):
        self.monthly_pnl = 0.0

    def status(self) -> dict:
        return {
            "trading_stopped": self.trading_stopped,
            "stop_reason"    : self.stop_reason,
            "daily_pnl"      : self.daily_pnl,
            "weekly_pnl"     : self.weekly_pnl,
            "monthly_pnl"    : self.monthly_pnl,
            "consec_loss"    : self.consec_loss,
            "risk_level"     : self.risk_level,
            "sl_pct"         : self.get_sl_pct(),
        }