⚠️Advanced Support & Resistance

init = () => {
  input.int("Lookback Period", 20, "lookback");
  input.int("Touches", 2, "touches");
  input.bool("Show Support", true, "showSupport");
  input.bool("Show Resistance", true, "showResistance");
  input.color("Support Color", color.green, "supportColor");
  input.color("Resistance Color", color.red, "resistanceColor");
};

onTick = (length, _moment, _, ta, inputs) => {
  const {
    lookback,
    touches,
    showSupport,
    showResistance,
    supportColor,
    resistanceColor,
  } = inputs;
  if (length < lookback) return;

  const lows = Array.from({ length: lookback }, (_, i) => low(i)).sort(
    (a, b) => a - b
  );
  const highs = Array.from({ length: lookback }, (_, i) => high(i)).sort(
    (a, b) => b - a
  );

  const uniqueLows = [...new Set(lows)];
  const uniqueHighs = [...new Set(highs)];

  let support = null;
  let resistance = null;

  for (let lvl of uniqueLows) {
    const count = lows.filter((l) => Math.abs(l - lvl) < 1e-8).length;
    const broken = lows.some((_, i) => closeC(i) < lvl - 1e-8);
    if (count >= touches && !broken) {
      support = lvl;
      break;
    }
  }

  for (let lvl of uniqueHighs) {
    const count = highs.filter((h) => Math.abs(h - lvl) < 1e-8).length;
    const broken = highs.some((_, i) => closeC(i) > lvl + 1e-8);
    if (count >= touches && !broken) {
      resistance = lvl;
      break;
    }
  }

  if (showSupport && support !== null) {
    horizontalLine(
      time(0),
      support,
      { linecolor: supportColor, linewidth: 2 },
      "Support"
    );
  }
  if (showResistance && resistance !== null) {
    horizontalLine(
      time(0),
      resistance,
      { linecolor: resistanceColor, linewidth: 2 },
      "Resistance"
    );
  }
};