// Voxel Fireflies preset for LEDLab

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

class VoxelFirefliesPreset extends BasePreset {
  constructor(width = 16, height = 16) {
    super(width, height);
    this.fireflies = [];
    this.paletteStops = [
      { stop: 0.0, color: hexToRgb('02030a') },
      { stop: 0.2, color: hexToRgb('031c2d') },
      { stop: 0.4, color: hexToRgb('053d4a') },
      { stop: 0.6, color: hexToRgb('107b68') },
      { stop: 0.8, color: hexToRgb('14c491') },
      { stop: 1.0, color: hexToRgb('f2ffd2') },
    ];
    this.defaultParameters = {
      fireflyCount: 18,
      hoverSpeed: 0.6,
      glowSpeed: 1.8,
      trailDecay: 0.8,
      brightness: 1.0,
    };
  }

  init() {
    super.init();
    this.fireflies = this.createFireflies(this.getParameter('fireflyCount') || 18, this.width, this.height);
  }

  createFireflies(count, matrixWidth, matrixHeight) {
    const list = [];
    for (let index = 0; index < count; ++index) {
      list.push(this.spawnFirefly(matrixWidth, matrixHeight));
    }
    return list;
  }

  spawnFirefly(matrixWidth, matrixHeight) {
    return {
      x: Math.random() * (matrixWidth - 1),
      y: Math.random() * (matrixHeight - 1),
      targetX: Math.random() * (matrixWidth - 1),
      targetY: Math.random() * (matrixHeight - 1),
      glowPhase: Math.random() * Math.PI * 2,
      dwell: 1 + Math.random() * 2,
    };
  }

  updateFirefly(firefly, deltaSeconds) {
    const dx = firefly.targetX - firefly.x;
    const dy = firefly.targetY - firefly.y;
    const distance = Math.hypot(dx, dy);

    if (distance < 0.2) {
      firefly.dwell -= deltaSeconds;
      if (firefly.dwell <= 0) {
        firefly.targetX = Math.random() * (this.width - 1);
        firefly.targetY = Math.random() * (this.height - 1);
        firefly.dwell = 1 + Math.random() * 2;
      }
    } else {
      const speed = (this.getParameter('hoverSpeed') || 0.6) * (0.8 + Math.random() * 0.4);
      firefly.x += (dx / distance) * speed * deltaSeconds;
      firefly.y += (dy / distance) * speed * deltaSeconds;
    }

    firefly.glowPhase += deltaSeconds * (this.getParameter('glowSpeed') || 1.8) * (0.7 + Math.random() * 0.6);
  }

  drawFirefly(firefly) {
    const baseGlow = (Math.sin(firefly.glowPhase) + 1) * 0.5;
    const col = Math.round(firefly.x);
    const row = Math.round(firefly.y);

    for (let dy = -1; dy <= 1; ++dy) {
      for (let dx = -1; dx <= 1; ++dx) {
        const sampleX = col + dx;
        const sampleY = row + dy;
        if (sampleX < 0 || sampleX >= this.width || sampleY < 0 || sampleY >= this.height) {
          continue;
        }

        const distance = Math.hypot(dx, dy);
        const falloff = clamp(1 - distance * 0.7, 0, 1);
        const intensity = baseGlow * falloff;
        if (intensity <= 0) {
          continue;
        }

        this.frame[toIndex(sampleX, sampleY, this.width)] = samplePalette(this.paletteStops, intensity);
        if (distance === 0) {
          addHexColor(this.frame, toIndex(sampleX, sampleY, this.width), 'ffd966', intensity * 1.6);
        }
      }
    }
  }

  renderFrame() {
    this.frame = createFrame(this.width, this.height);
    const trailDecay = this.getParameter('trailDecay') || 0.8;
    const fireflyCount = this.getParameter('fireflyCount') || 18;
    const brightness = this.getParameter('brightness') || 1.0;

    fadeFrame(this.frame, trailDecay);

    // Update firefly count if it changed
    while (this.fireflies.length < fireflyCount) {
      this.fireflies.push(this.spawnFirefly(this.width, this.height));
    }
    while (this.fireflies.length > fireflyCount) {
      this.fireflies.pop();
    }

    this.fireflies.forEach((firefly) => {
      this.updateFirefly(firefly, 0.016); // Assume 60 FPS
      this.drawFirefly(firefly);
    });

    return this.frame;
  }

  getMetadata() {
    return {
      name: 'Voxel Fireflies',
      description: 'Glowing fireflies that hover and move around',
      parameters: {
        fireflyCount: { type: 'range', min: 8, max: 30, step: 2, default: 18 },
        hoverSpeed: { type: 'range', min: 0.3, max: 1.2, step: 0.1, default: 0.6 },
        glowSpeed: { type: 'range', min: 1.0, max: 3.0, step: 0.2, default: 1.8 },
        trailDecay: { type: 'range', min: 0.7, max: 0.95, step: 0.05, default: 0.8 },
        brightness: { type: 'range', min: 0.5, max: 1.5, step: 0.1, default: 1.0 },
      },
      width: this.width,
      height: this.height,
    };
  }
}

module.exports = VoxelFirefliesPreset;