// Wormhole Tunnel preset for LEDLab

const BasePreset = require('./base-preset');
const { createFrame, frameToPayload, hexToRgb, samplePalette, toIndex, clamp } = require('./frame-utils');

class WormholeTunnelPreset extends BasePreset {
  constructor(width = 16, height = 16) {
    super(width, height);
    this.timeSeconds = 0;
    this.paletteStops = [
      { stop: 0.0, color: hexToRgb('010005') },
      { stop: 0.2, color: hexToRgb('07204f') },
      { stop: 0.45, color: hexToRgb('124aa0') },
      { stop: 0.7, color: hexToRgb('36a5ff') },
      { stop: 0.87, color: hexToRgb('99e6ff') },
      { stop: 1.0, color: hexToRgb('f1fbff') },
    ];
    this.defaultParameters = {
      ringDensity: 8,
      ringSpeed: 1.4,
      ringSharpness: 7.5,
      twistIntensity: 2.2,
      twistSpeed: 0.9,
      coreExponent: 1.6,
      brightness: 1.0,
    };
  }

  renderFrame() {
    this.timeSeconds += 0.016; // Assume 60 FPS

    const frame = createFrame(this.width, this.height);
    const brightness = this.getParameter('brightness') || 1.0;

    const cx = (this.width - 1) / 2;
    const cy = (this.height - 1) / 2;
    const radiusNorm = Math.hypot(cx, cy) || 1;

    for (let row = 0; row < this.height; ++row) {
      for (let col = 0; col < this.width; ++col) {
        const dx = col - cx;
        const dy = row - cy;
        const radius = Math.hypot(dx, dy) / radiusNorm;
        const angle = Math.atan2(dy, dx);

        const radialPhase = radius * (this.getParameter('ringDensity') || 8) - this.timeSeconds * (this.getParameter('ringSpeed') || 1.4);
        const ring = Math.exp(-Math.pow(Math.sin(radialPhase * Math.PI), 2) * (this.getParameter('ringSharpness') || 7.5));

        const twist = Math.sin(angle * (this.getParameter('twistIntensity') || 2.2) + this.timeSeconds * (this.getParameter('twistSpeed') || 0.9)) * 0.35 + 0.65;
        const depth = Math.pow(clamp(1 - radius, 0, 1), this.getParameter('coreExponent') || 1.6);

        const value = clamp(ring * 0.6 + depth * 0.3 + twist * 0.1, 0, 1);

        let color = samplePalette(this.paletteStops, value);

        // Apply brightness
        if (brightness < 1.0) {
          const rgb = hexToRgb(color);
          color = Math.round(rgb.r * brightness).toString(16).padStart(2, '0') +
                  Math.round(rgb.g * brightness).toString(16).padStart(2, '0') +
                  Math.round(rgb.b * brightness).toString(16).padStart(2, '0');
        }

        frame[toIndex(col, row, this.width)] = color;
      }
    }

    return frame;
  }

  getMetadata() {
    return {
      name: 'Wormhole Tunnel',
      description: 'Hypnotic tunnel effect with rotating rings',
      parameters: {
        ringDensity: { type: 'range', min: 4, max: 12, step: 1, default: 8 },
        ringSpeed: { type: 'range', min: 0.5, max: 2.5, step: 0.1, default: 1.4 },
        ringSharpness: { type: 'range', min: 3, max: 12, step: 0.5, default: 7.5 },
        twistIntensity: { type: 'range', min: 1.0, max: 4.0, step: 0.2, default: 2.2 },
        twistSpeed: { type: 'range', min: 0.3, max: 1.5, step: 0.1, default: 0.9 },
        coreExponent: { type: 'range', min: 1.0, max: 2.5, step: 0.1, default: 1.6 },
        brightness: { type: 'range', min: 0.3, max: 1.0, step: 0.1, default: 1.0 },
      },
      width: this.width,
      height: this.height,
    };
  }
}

module.exports = WormholeTunnelPreset;