// API Proxy for Pocket TTS
export default async function handler(req, res) {
  if (req.method !== 'POST') {
    return res.status(405).json({ message: 'Method not allowed' });
  }

  const { text } = req.body;

  try {
    // Simulate processing
    await new Promise(resolve => setTimeout(resolve, 1000));

    // Create a minimal valid WAV file header + silence
    // This ensures the audio player actually renders something
    const sampleRate = 24000;
    const numChannels = 1;
    const bitsPerSample = 16;
    const dataSize = sampleRate * numChannels * (bitsPerSample / 8) * 1; // 1 second of audio
    const buffer = Buffer.alloc(44 + dataSize);

    // RIFF chunk descriptor
    buffer.write('RIFF', 0);
    buffer.writeUInt32LE(36 + dataSize, 4);
    buffer.write('WAVE', 8);

    // fmt sub-chunk
    buffer.write('fmt ', 12);
    buffer.writeUInt32LE(16, 16); // Subchunk1Size
    buffer.writeUInt16LE(1, 20); // AudioFormat (PCM)
    buffer.writeUInt16LE(numChannels, 22);
    buffer.writeUInt32LE(sampleRate, 24);
    buffer.writeUInt32LE(sampleRate * numChannels * (bitsPerSample / 8), 28); // ByteRate
    buffer.writeUInt16LE(numChannels * (bitsPerSample / 8), 32); // BlockAlign
    buffer.writeUInt16LE(bitsPerSample, 34);

    // data sub-chunk
    buffer.write('data', 36);
    buffer.writeUInt32LE(dataSize, 40);
    
    // The rest of the buffer is already zeros (silence)
    
    res.setHeader('Content-Type', 'audio/wav');
    return res.status(200).send(buffer);
    
  } catch (error) {
    console.error('TTS Error:', error);
    return res.status(500).json({ message: 'Internal Server Error' });
  }
}