// Meteor Rain preset for LEDLab

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

class MeteorRainPreset extends BasePreset {
  constructor(width = 16, height = 16) {
    super(width, height);
    this.meteors = [];
    this.paletteStops = [
      { stop: 0.0, color: hexToRgb('0a0126') },
      { stop: 0.3, color: hexToRgb('123d8b') },
      { stop: 0.7, color: hexToRgb('21c7d9') },
      { stop: 1.0, color: hexToRgb('f7ffff') },
    ];
    this.defaultParameters = {
      meteorCount: 12,
      minSpeed: 4,
      maxSpeed: 10,
      trailDecay: 0.76,
    };
  }

  init() {
    super.init();
    this.meteors = this.createMeteors(this.getParameter('meteorCount') || 12, this.width, this.height);
  }

  createMeteors(count, matrixWidth, matrixHeight) {
    const meteorList = [];
    for (let index = 0; index < count; ++index) {
      meteorList.push(this.spawnMeteor(matrixWidth, matrixHeight));
    }
    return meteorList;
  }

  spawnMeteor(matrixWidth, matrixHeight) {
    const angle = (Math.PI / 4) * (0.6 + Math.random() * 0.8);
    const speed = (this.getParameter('minSpeed') || 4) + Math.random() * ((this.getParameter('maxSpeed') || 10) - (this.getParameter('minSpeed') || 4));
    return {
      x: Math.random() * matrixWidth,
      y: -Math.random() * matrixHeight,
      vx: Math.cos(angle) * speed,
      vy: Math.sin(angle) * speed,
    };
  }

  drawMeteor(meteor) {
    const col = Math.round(meteor.x);
    const row = Math.round(meteor.y);
    if (col < 0 || col >= this.width || row < 0 || row >= this.height) {
      return;
    }

    const energy = clamp(1.2 - Math.random() * 0.2, 0, 1);
    this.frame[toIndex(col, row, this.width)] = samplePalette(this.paletteStops, energy);
  }

  updateMeteors(deltaSeconds) {
    this.meteors.forEach((meteor, index) => {
      meteor.x += meteor.vx * deltaSeconds;
      meteor.y += meteor.vy * deltaSeconds;

      this.drawMeteor(meteor);

      if (meteor.x > this.width + 1 || meteor.y > this.height + 1) {
        this.meteors[index] = this.spawnMeteor(this.width, this.height);
      }
    });
  }

  renderFrame() {
    this.frame = createFrame(this.width, this.height);
    const trailDecay = this.getParameter('trailDecay') || 0.76;
    const meteorCount = this.getParameter('meteorCount') || 12;

    fadeFrame(this.frame, trailDecay);

    // Update meteor count if it changed
    while (this.meteors.length < meteorCount) {
      this.meteors.push(this.spawnMeteor(this.width, this.height));
    }
    while (this.meteors.length > meteorCount) {
      this.meteors.pop();
    }

    this.updateMeteors(0.016); // Assume 60 FPS

    return this.frame;
  }

  getMetadata() {
    return {
      name: 'Meteor Rain',
      description: 'Falling meteors with trailing effects',
      parameters: {
        meteorCount: { type: 'range', min: 5, max: 20, step: 1, default: 12 },
        minSpeed: { type: 'range', min: 2, max: 8, step: 1, default: 4 },
        maxSpeed: { type: 'range', min: 6, max: 15, step: 1, default: 10 },
        trailDecay: { type: 'range', min: 0.6, max: 0.9, step: 0.02, default: 0.76 },
      },
      width: this.width,
      height: this.height,
    };
  }
}

module.exports = MeteorRainPreset;