// voice-credit.mjs — the credits line for a run's voices, naming where each voice really came from.
const VENDORS = {
  heygen: "HeyGen",
  elevenlabs: "ElevenLabs",
  gemini: "Google Gemini",
  kokoro: "Kokoro (open-source, run locally)",
};

/** "Voice: ..." for the voices an audio run made or took in, or null when it has none. */
export function voiceCredit(voices, ttsProvider) {
  const sources = new Set(voices.map((v) => v.source ?? ttsProvider).filter(Boolean));
  if (sources.size === 0) return null;
  const parts = [...sources].map((s) =>
    s === "recording" ? "your own recording" : `AI-generated by ${VENDORS[s] ?? s}`,
  );
  return `Voice: ${parts.join("; ")}`;
}