export interface TrailState {
  highestHigh: number;
  stop: number;
}

/** Chandelier-Stop: hh − mult×ATR, wandert nur aufwärts. Aufruf pro abgeschlossener 4h-Candle. */
export function updateChandelier(state: TrailState, barHigh: number, atrValue: number, mult: number): TrailState {
  const highestHigh = Math.max(state.highestHigh, barHigh);
  const candidate = Number.isNaN(atrValue) ? -Infinity : highestHigh - mult * atrValue;
  return { highestHigh, stop: Math.max(state.stop, candidate) };
}