MIDI Generation Callbacks

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

app.use(express.json());

app.post('/suno-midi-callback', (req, res) => {
  const { code, msg, task_id, data } = req.body;
  
  console.log('Received MIDI generation callback:', {
    taskId: task_id,
    status: code,
    message: msg
  });
  
  if (code === 200) {
    // Task completed successfully
    console.log('MIDI generation completed');
    
    if (data && data.instruments) {
      console.log(`Detected ${data.instruments.length} instruments`);
      
      data.instruments.forEach(instrument => {
        console.log(`\nInstrument: ${instrument.name}`);
        console.log(`  Note count: ${instrument.notes.length}`);
        
        // Process each note
        instrument.notes.forEach((note, idx) => {
          if (idx < 3) { // Show first 3 notes as example
            console.log(`  Note ${idx + 1}: Pitch ${note.pitch}, ` +
                       `Start ${note.start}s, End ${note.end}s, ` +
                       `Velocity ${note.velocity}`);
          }
        });
      });
      
      // Save MIDI data to database or file
      // processMidiData(task_id, data);
    }
    
  } else {
    // Task failed
    console.log('MIDI generation failed:', msg);
    
    // Handle failure scenarios...
  }
  
  // Return 200 status code to confirm callback received
  res.status(200).json({ status: 'received' });
});

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