const http = require('http');
const fs = require('fs');
const path = require('path');

// Create a server to handle file uploads
const server = http.createServer((req, res) => {
  if (req.method === 'POST' && req.url === '/upload') {
    // Create a write stream to a file
    const filePath = path.join(__dirname, 'uploaded-file.txt');
    const fileStream = fs.createWriteStream(filePath);
    
    // Pipe the request body directly to the file
    req.pipe(fileStream);
    
    // Handle completion
    fileStream.on('finish', () => {
      // Get file stats to check size
      fs.stat(filePath, (err, stats) => {
        if (err) {
          console.error('Error getting file stats:', err);
          res.writeHead(500, {'Content-Type': 'text/plain'});
          res.end('Error processing upload');
          return;
        }
        
        // Send response
        res.writeHead(200, {'Content-Type': 'application/json'});
        res.end(JSON.stringify({
          success: true,
          message: 'File uploaded successfully',
          size: stats.size,
          path: filePath
        }));
        
        console.log(`File uploaded to ${filePath}`);
        console.log(`File size: ${stats.size} bytes`);
        
        // Clean up the file after a delay
        setTimeout(() => {
          fs.unlink(filePath, (err) => {
            if (err) console.error('Error removing uploaded file:', err);
            else console.log('Uploaded file removed');
          });
        }, 5000);
      });
    });
    
    // Handle errors
    fileStream.on('error', (err) => {
      console.error('File write error:', err);
      res.writeHead(500, {'Content-Type': 'text/plain'});
      res.end('Error saving file');
    });
    
    req.on('error', (err) => {
      console.error('Request error:', err);
      fileStream.destroy(err);
    });
  } 
  else if (req.method === 'GET' && req.url === '/') {
    // Provide a simple HTML form for uploading
    res.writeHead(200, {'Content-Type': 'text/html'});
    res.end(`
      
      
      
        
      
      
        
Upload a Text File
        

          
          Upload
        
        
Note: This is a simple example. A real implementation would need to parse multipart form data.
      
      
    `);
  } 
  else {
    // Handle all other requests
    res.writeHead(404, {'Content-Type': 'text/plain'});
    res.end('Not Found');
  }
});

// Start server
const PORT = 8080;
server.listen(PORT, () => {
  console.log(`Server running at http://localhost:${PORT}/`);
  
  // Make a test upload
  setTimeout(() => {
    const req = http.request({
      hostname: 'localhost',
      port: PORT,
      path: '/upload',
      method: 'POST',
      headers: {
        'Content-Type': 'text/plain'
      }
    }, (res) => {
      let data = '';
      res.on('data', (chunk) => { data += chunk; });
      res.on('end', () => {
        console.log('Upload response:', data);
      });
    });
    
    req.on('error', (e) => {
      console.error('Test request error:', e.message);
    });
    
    // Write some content to upload
    req.write('This is a test file content uploaded using http.request.\n');
    req.write('It demonstrates streaming data to the server.\n');
    req.end();
  }, 1000);
});