export async function POST(req: Request) {
  const { text, voiceId } = await req.json();

  const apiKey = process.env.ELEVENLABS_API_KEY;
  if (!apiKey) {
    return new Response(
      JSON.stringify({ error: "ELEVENLABS_API_KEY not set" }),
      {
        status: 500,
        headers: { "Content-Type": "application/json" },
      },
    );
  }

  const voice = voiceId || "21m00Tcm4TlvDq8ikWAM";

  const response = await fetch(
    `https://api.elevenlabs.io/v1/text-to-speech/${voice}`,
    {
      method: "POST",
      headers: {
        "xi-api-key": apiKey,
        "Content-Type": "application/json",
      },
      body: JSON.stringify({
        text,
        model_id: "eleven_monolingual_v1",
        voice_settings: {
          stability: 0.5,
          similarity_boost: 0.75,
        },
      }),
    },
  );

  if (!response.ok) {
    return new Response(JSON.stringify({ error: "TTS generation failed" }), {
      status: 500,
      headers: { "Content-Type": "application/json" },
    });
  }

  const audioBuffer = await response.arrayBuffer();
  return new Response(audioBuffer, {
    headers: {
      "Content-Type": "audio/mpeg",
      "Cache-Control": "public, max-age=3600",
    },
  });
}