/**
 * TTS worker — run as a separate Bun subprocess so a crash in the Edge-TTS
 * path cannot take down the main server.
 * Usage: bun tts-worker.mjs "<voice>" "<text>"
 * Writes MP3 audio bytes to stdout; non-zero exit on error.
 */
import { EdgeTTS } from "edge-tts-universal";

const voice = process.argv[2] || "vi-VN-HoaiMyNeural";
const text = process.argv[3] || "";

try {
  const tts = new EdgeTTS(text, voice, { rate: "+0%", volume: "+0%", pitch: "+0Hz" });
  const result = await tts.synthesize();
  const audio = Buffer.from(await result.audio.arrayBuffer());
  if (!audio || !audio.length) process.exit(2);
  process.stdout.write(audio);
} catch (e) {
  console.error("TTS_WORKER_ERROR:", e?.message || e);
  process.exit(1);
}