Luma Modify Video Callbacks

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

app.use(express.json());

app.post('/luma-modify-callback', (req, res) => {
  const { code, msg, data } = req.body;
  
  console.log('Received Luma video modification callback:', {
    taskId: data.taskId,
    status: code,
    message: msg
  });
  
  if (code === 200) {
    // Task completed successfully
    console.log('Luma video modification completed successfully');
    
    const { taskId, promptJson, resultUrls } = data;
    
    console.log(`Task ID: ${taskId}`);
    console.log(`Original Parameters: ${promptJson}`);
    console.log(`Generated Video URLs: ${resultUrls.join(', ')}`);
    
    // Download generated videos
    resultUrls.forEach((url, index) => {
      const filename = `luma_result_${taskId}_${index + 1}.mp4`;
      downloadFile(url, filename)
        .then(() => console.log(`Video ${index + 1} downloaded successfully`))
        .catch(err => console.error(`Video ${index + 1} download failed:`, err));
    });
    
  } else {
    // Task failed
    console.log('Luma video modification failed:', msg);
    
    // Log original parameters for debugging
    const { promptJson } = data;
    console.log('Original parameters:', promptJson);
    
    // Handle specific error cases
    console.log('Please check your input video and prompt, then try again');
  }
  
  // Return 200 status code to confirm callback received
  res.status(200).json({ status: 'received' });
});

// Helper function to download files
function downloadFile(url, filename) {
  return new Promise((resolve, reject) => {
    const file = fs.createWriteStream(filename);
    
    https.get(url, (response) => {
      if (response.statusCode === 200) {
        response.pipe(file);
        file.on('finish', () => {
          file.close();
          resolve();
        });
      } else {
        reject(new Error(`HTTP ${response.statusCode}`));
      }
    }).on('error', reject);
  });
}

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