Lyrics Generation Callbacks

const express = require('express');
const app = express();

app.use(express.json());

app.post('/lyrics-callback', (req, res) => {
  const { code, msg, data } = req.body;
  
  console.log('Received lyrics generation callback:', {
    taskId: data.taskId,
    callbackType: data.callbackType,
    status: code,
    message: msg
  });
  
  if (code === 200 && data.callbackType === 'complete') {
    // Lyrics generation successful
    console.log(`Generated ${data.data.length} lyrics variants:`);
    
    data.data.forEach((lyrics, index) => {
      if (lyrics.status === 'complete') {
        console.log(`\nLyrics ${index + 1}:`);
        console.log(`Title: ${lyrics.title}`);
        console.log(`Content:\n${lyrics.text}`);
        
        // Process lyrics data
        // Can save to database, format for display, etc.
        saveLyricsToDatabase(lyrics);
      } else {
        console.log(`Lyrics ${index + 1} failed: ${lyrics.errorMessage}`);
      }
    });
    
  } else {
    // Task failed
    console.log('Lyrics generation failed:', msg);
    
    // Handle failure cases...
    if (code === 400) {
      console.log('Parameter error or content violation');
    } else if (code === 429) {
      console.log('Insufficient credits');
    } else if (code === 500) {
      console.log('Server internal error');
    }
  }
  
  // Return 200 status code to confirm callback received
  res.status(200).json({ status: 'received' });
});

function saveLyricsToDatabase(lyrics) {
  // Example function to save lyrics to database
  console.log(`Saving lyrics: ${lyrics.title}`);
  // Your database logic here
}

app.listen(3000, () => {
  console.log('Lyrics callback server running on port 3000');
});