/**
 * AudioWorkletProcessor that collects 512-sample chunks of PCM audio
 * and posts them to the main thread for WebSocket transmission.
 */
class PCMProcessor extends AudioWorkletProcessor {
  constructor() {
    super();
    this.buffer = new Float32Array(0);
    this.chunkSize = 512; // 512 samples at 16kHz = 32ms
  }

  process(inputs) {
    const input = inputs[0];
    if (!input || !input[0]) return true;

    const channelData = input[0]; // mono

    // Append to buffer
    const newBuffer = new Float32Array(this.buffer.length + channelData.length);
    newBuffer.set(this.buffer);
    newBuffer.set(channelData, this.buffer.length);
    this.buffer = newBuffer;

    // Send complete chunks
    while (this.buffer.length >= this.chunkSize) {
      const chunk = this.buffer.slice(0, this.chunkSize);
      this.buffer = this.buffer.slice(this.chunkSize);

      // Convert float32 to int16 for transmission
      const int16 = new Int16Array(chunk.length);
      for (let i = 0; i < chunk.length; i++) {
        const s = Math.max(-1, Math.min(1, chunk[i]));
        int16[i] = s < 0 ? s * 0x8000 : s * 0x7fff;
      }
      this.port.postMessage(int16.buffer, [int16.buffer]);
    }

    return true;
  }
}

registerProcessor("pcm-processor", PCMProcessor);