// Fade preset for LEDLab

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

class FadePreset extends BasePreset {
  constructor(width = 16, height = 16) {
    super(width, height);
    this.tick = 0;
    this.defaultParameters = {
      speed: 0.5, // cycles per second
      brightness: 1.0,
      color1: '00ff00', // Green
      color2: '0000ff', // Blue
    };
  }

  hexToRgb(hex) {
    const r = parseInt(hex.slice(0, 2), 16);
    const g = parseInt(hex.slice(2, 4), 16);
    const b = parseInt(hex.slice(4, 6), 16);
    return { r, g, b };
  }

  renderFrame() {
    const frame = createFrame(this.width, this.height);
    const timeSeconds = (this.tick * 0.016); // Assume 60 FPS
    const phase = timeSeconds * this.getParameter('speed') * Math.PI * 2;
    const blend = (Math.sin(phase) + 1) * 0.5; // 0..1

    const brightness = this.getParameter('brightness') || 1.0;
    const color1 = this.hexToRgb(this.getParameter('color1') || '00ff00');
    const color2 = this.hexToRgb(this.getParameter('color2') || '0000ff');

    const r = Math.round((color1.r * (1 - blend) + color2.r * blend) * brightness);
    const g = Math.round((color1.g * (1 - blend) + color2.g * blend) * brightness);
    const b = Math.round((color1.b * (1 - blend) + color2.b * blend) * brightness);

    const rHex = r.toString(16).padStart(2, '0');
    const gHex = g.toString(16).padStart(2, '0');
    const bHex = b.toString(16).padStart(2, '0');

    for (let i = 0; i < frame.length; i++) {
      frame[i] = rHex + gHex + bHex;
    }

    this.tick++;
    return frame;
  }

  getMetadata() {
    return {
      name: 'Fade',
      description: 'Smooth fade between two colors',
      parameters: {
        speed: { type: 'range', min: 0.1, max: 2.0, step: 0.1, default: 0.5 },
        brightness: { type: 'range', min: 0.1, max: 1.0, step: 0.1, default: 1.0 },
        color1: { type: 'color', default: '00ff00' },
        color2: { type: 'color', default: '0000ff' },
      },
      width: this.width,
      height: this.height,
    };
  }
}

module.exports = FadePreset;