AI Video Extension Callbacks

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

app.use(express.json());

app.post('/runway-extend-callback', (req, res) => {
  const { code, msg, data } = req.body;
  
  console.log('Received Runway video extension callback:', {
    taskId: data.task_id,
    status: code,
    message: msg
  });
  
  if (code === 200) {
    // Video extension successful
    const { task_id, video_id, video_url, image_url } = data;
    
    console.log('Video extension successful!');
    console.log(`Task ID: ${task_id}`);
    console.log(`Video ID: ${video_id}`);
    console.log(`Video URL: ${video_url}`);
    console.log(`Cover URL: ${image_url}`);
    
    // Download video file
    if (video_url) {
      downloadFile(video_url, `runway_extend_${task_id}.mp4`)
        .then(() => console.log('Video download successful'))
        .catch(err => console.error('Video download failed:', err));
    }
    
    // Download cover image
    if (image_url) {
      downloadFile(image_url, `runway_extend_cover_${task_id}.png`)
        .then(() => console.log('Cover download successful'))
        .catch(err => console.error('Cover download failed:', err));
    }
    
  } else {
    // Video extension failed
    console.log('Runway video extension failed:', msg);
    
    // Handle specific error types
    if (code === 400) {
      console.log('Client error - Check input parameters and content');
    } else if (code === 500) {
      console.log('Server error - Please try again later');
    }
  }
  
  // Return 200 status code to confirm callback received
  res.status(200).json({ code: 200, msg: 'success' });
});

// Helper function: Download file
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('Callback server running on port 3000');
});