server.js

const WebSocket = require('ws');
const express = require('express');
const http = require('http');

// Create an Express app
const app = express();

// Create an HTTP server using Express (this allows us to add health check route)
const server = http.createServer(app);

// Create a WebSocket server using the same HTTP server
const wss = new WebSocket.Server({ server }); // { port: 8080 }

// WebSocket server
wss.on('connection', function (wsConnection) {
  console.log('Client connected');

  wsConnection.on('message', function (message) {
    console.log(`Server received message: ${message}`);
  });

  wsConnection.send('Got your message!');

  // Handle client disconnecting
  wsConnection.on('close', function () {
    console.log('Client disconnected');
  });
});

// Health check route (to test if the server is deployed)
app.get('/health', (req, res) => {
  res.status(200).send('WebSocket server is running!');
});

// Start the HTTP server (which also handles WebSocket connections)
const PORT = process.env.PORT || 8080;
server.listen(PORT, () => {
  console.log(`WebSocket server is running on ws://localhost:${PORT}`);
  console.log(`Health check available at http://localhost:${PORT}/health`);
});


// FE
// const socket = new WebSocket('ws://localhost:8080'); 
// socket.addEventListener('open', function (event) { 
//   socket.send('Hello Server!'); 
// }); 

// socket.addEventListener('message', function (event) { 
//   console.log('Message from server ', event.data); 
// });

// socket.addEventListener('close', function (event) { 
//   console.log('The connection has been closed'); 
// });

// Event listener for WebSocket errors
// socket.addEventListener('error', function (event) {
//   console.error('WebSocket error observed:', event);
// });