from datetime import datetime, timedelta, timezone
from utils.indicators import atr

class Filters:
    def __init__(self, cfg: dict):
        self.cfg = cfg
        self.news = [(datetime.fromisoformat(d), int(b), int(a)) for d, b, a in cfg.get("news_blackouts", [])]

    def spread_ok(self, symbol, info, tick) -> bool:
        lim = self.cfg["max_spread_points"]
        return (tick.ask - tick.bid) / info.point <= lim.get(symbol, lim["default"])

    def session_ok(self) -> bool:
        h = datetime.now(timezone.utc).hour
        return any(a <= h < b for a, b in self.cfg["sessions_utc"])

    def news_ok(self) -> bool:
        now = datetime.now(timezone.utc).replace(tzinfo=None)
        return not any(t - timedelta(minutes=b) <= now <= t + timedelta(minutes=a) for t, b, a in self.news)

    def regime_ok(self, df) -> bool:
        r = self.cfg.get("regime", {})
        if not r.get("enabled"):
            return True
        a = atr(df, 14)
        return a.iloc[-1] / a.iloc[-100:].mean() >= r["min_atr_ratio"]

    def all_ok(self, symbol, info, tick, df):
        if not self.session_ok(): return False, "hors session"
        if not self.news_ok(): return False, "fenêtre news"
        if not self.spread_ok(symbol, info, tick): return False, "spread élevé"
        if not self.regime_ok(df): return False, "volatilité trop faible"
        return True, ""