from core.models import Signal
from strategies.base import Strategy
from utils.indicators import ema, rsi, atr, adx

class RegimeRsi(Strategy):
    """Stratégie par régime (ADX) : pullback RSI en range, reprise de momentum en tendance.
    SL et TP fixes basés sur l'ATR. Pas de martingale, pas de grille."""
    name = "regime_rsi"

    def on_bar(self, symbol, df):
        p = self.p
        f, s = ema(df.close, p["fast"]), ema(df.close, p["slow"])
        r = rsi(df.close, p["rsi_period"])
        ad, a = adx(df, 14).iloc[-1], atr(df, 14).iloc[-1]
        if ad > p["adx_max"]:            # mouvement trop étendu: on ne poursuit pas
            return None
        up = f.iloc[-1] > s.iloc[-1]
        r1, r0 = r.iloc[-1], r.iloc[-2]
        if ad < p["adx_threshold"]:      # marché calme / range: RSI "assoupli"
            buy = up and r1 < p["rsi_buy_range"] and r1 > r0
            sell = (not up) and r1 > p["rsi_sell_range"] and r1 < r0
        else:                            # tendance: reprise de momentum autour de 50
            buy = up and r0 < 50 <= r1 < p["rsi_ob"]
            sell = (not up) and r0 > 50 >= r1 > p["rsi_os"]
        if buy or sell:
            return Signal(symbol, "buy" if buy else "sell", p["sl_atr"] * a, p["tp_atr"] * a,
                          self.name, "range" if ad < p["adx_threshold"] else "trend")