const SAMPLE_RATE = 48000;
const PACKET_MS = 20;
const PACKET_FRAMES = PACKET_MS / 1000 * SAMPLE_RATE;
console.log("Frames per packet:", PACKET_FRAMES);

class RustWorklet extends AudioWorkletProcessor {
  constructor(options) {
    super();
    this.module = options.processorOptions;
    this.timestamp = null;
    this.buffer = new Float32Array(PACKET_FRAMES);
    this.buffer_offset = 0;
    if (sampleRate != SAMPLE_RATE) {
      throw Error(`sample rate ${sampleRate} should be ${SAMPLE_RATE}`);
    }

    console.log('RustWorklet:', this);

  }

  do_send() {
    const data = {
      format: 'f32',
      sampleRate: SAMPLE_RATE,
      numberOfFrames: this.buffer_offset,
      numberOfChannels: 1,
      timestamp: this.timestamp,
      data: this.buffer.slice(0, this.buffer_offset),
    };
    this.port.postMessage(data);
    this.buffer_offset = 0;    
    this.timestamp = null;
   }

  process(inputs) {
    const input = inputs[0];
    if (input.length == 0) {
      return true
    }

    if (this.timestamp == null) {
      this.timestamp = currentFrame / SAMPLE_RATE * 1e6;
    }

    const frames = input[0];

    if (this.buffer_offset + frames.length > this.buffer.length) {
      // too full, send now
      this.do_send();
    }

    this.buffer.set(frames, this.buffer_offset);
    this.buffer_offset += frames.length;

    if (this.buffer_offset + 128 > this.buffer.length) {
      // full enough, send now
      this.do_send();
    }
    return true;
  }
};

registerProcessor("rust_mic_worklet", RustWorklet);