Lofi_Generator/lib/audio/ambientLayer.ts

import * as Tone from 'tone';
import { AmbientType } from '@/types/audio';

export class AmbientLayer {
  private noise1: Tone.Noise | null = null;
  private noise2: Tone.Noise | null = null;
  private filter1: Tone.Filter | null = null;
  private filter2: Tone.Filter | null = null;
  private gain1: Tone.Gain | null = null;
  private gain2: Tone.Gain | null = null;
  private output: Tone.Gain;
  private lfo: Tone.LFO | null = null;
  private currentType: AmbientType = 'rain';
  private isPlaying = false;
  private currentVolume: number = 0.4;
  private isMuted: boolean = false;

  constructor(destination: Tone.InputNode) {
    this.output = new Tone.Gain(this.currentVolume);
    this.output.connect(destination);
    this.createAmbient('rain');
  }

  private createAmbient(type: AmbientType): void {
    this.noise1?.dispose();
    this.noise2?.dispose();
    this.filter1?.dispose();
    this.filter2?.dispose();
    this.gain1?.dispose();
    this.gain2?.dispose();
    this.lfo?.dispose();

    const configs: Record<AmbientType, {
      noise1: { type: 'white' | 'pink' | 'brown'; filter: number; filterType: BiquadFilterType; gain: number };
      noise2: { type: 'white' | 'pink' | 'brown'; filter: number; filterType: BiquadFilterType; gain: number };
      lfoFreq: number;
    }> = {
      rain: {
        noise1: { type: 'pink', filter: 3000, filterType: 'lowpass', gain: 0.15 },
        noise2: { type: 'brown', filter: 1500, filterType: 'bandpass', gain: 0.1 },
        lfoFreq: 0.1,
      },
      vinyl: {
        noise1: { type: 'brown', filter: 2000, filterType: 'bandpass', gain: 0.12 },
        noise2: { type: 'white', filter: 800, filterType: 'lowpass', gain: 0.05 },
        lfoFreq: 0.05,
      },
      nature: {
        noise1: { type: 'pink', filter: 4000, filterType: 'lowpass', gain: 0.1 },
        noise2: { type: 'brown', filter: 500, filterType: 'lowpass', gain: 0.08 },
        lfoFreq: 0.08,
      },
      space: {
        noise1: { type: 'pink', filter: 1000, filterType: 'lowpass', gain: 0.12 },
        noise2: { type: 'brown', filter: 300, filterType: 'lowpass', gain: 0.1 },
        lfoFreq: 0.02,
      },
    };

    const config = configs[type];

    this.noise1 = new Tone.Noise(config.noise1.type);
    this.filter1 = new Tone.Filter({
      frequency: config.noise1.filter,
      type: config.noise1.filterType,
    });
    this.gain1 = new Tone.Gain(config.noise1.gain);
    this.noise1.connect(this.filter1);
    this.filter1.connect(this.gain1);
    this.gain1.connect(this.output);

    this.noise2 = new Tone.Noise(config.noise2.type);
    this.filter2 = new Tone.Filter({
      frequency: config.noise2.filter,
      type: config.noise2.filterType,
    });
    this.gain2 = new Tone.Gain(config.noise2.gain);
    this.noise2.connect(this.filter2);
    this.filter2.connect(this.gain2);
    this.gain2.connect(this.output);

    this.lfo = new Tone.LFO({
      frequency: config.lfoFreq,
      min: config.noise1.gain * 0.7,
      max: config.noise1.gain * 1.2,
    });
    this.lfo.connect(this.gain1.gain);

    this.currentType = type;

    if (this.isPlaying) {
      this.noise1.start();
      this.noise2.start();
      this.lfo.start();
    }
  }

  setInstrument(type: AmbientType): void {
    this.createAmbient(type);
  }

  start(): void {
    this.noise1?.start();
    this.noise2?.start();
    this.lfo?.start();
    this.isPlaying = true;
  }

  stop(): void {
    this.noise1?.stop();
    this.noise2?.stop();
    this.lfo?.stop();
    this.isPlaying = false;
  }

  setVolume(volume: number): void {
    this.currentVolume = volume;
    if (!this.isMuted) {
      this.output.gain.rampTo(volume, 0.1);
    }
  }

  mute(muted: boolean): void {
    this.isMuted = muted;
    this.output.gain.rampTo(muted ? 0 : this.currentVolume, 0.1);
  }

  dispose(): void {
    this.stop();
    this.noise1?.dispose();
    this.noise2?.dispose();
    this.filter1?.dispose();
    this.filter2?.dispose();
    this.gain1?.dispose();
    this.gain2?.dispose();
    this.lfo?.dispose();
    this.output.dispose();
  }
}