index.js

const express = require('express');
const http = require('http');
const socketIo = require('socket.io');

const app = express();
const server = http.createServer(app);
const io = socketIo(server, {
    path: '/socket.io/',
});

// Store connected users
const users = {};

app.get('/', (req, res) => {
    res.send('Chat server is running. Connect via WebSocket.');
});

// Listen for connections
io.on('connection', (socket) => {
    console.log('A user connected:', socket.id);

    // Listen for user joining
    socket.on('user joined', (username, color) => {
        users[socket.id] = { username, color };
        console.log(`${username} has joined with color ${color}`);
        // Notify all users that a new user has joined
        io.emit('user joined', { username, color });
    });

    // Listen for messages using socket.send()
    socket.on('message', (data) => {
        const user = users[socket.id];
        if (user) {
            console.log(`Message received: ${data.msg} from ${user.username}`);
            // Use socket.send to send messages back to all clients
            io.emit('message', { msg: data.msg, nick: user.username, color: user.color });
        }
    });

    // Handle disconnection
    socket.on('disconnect', () => {
        const user = users[socket.id];
        if (user) {
            console.log(`${user.username} has disconnected`);
            // Notify others that this user has left
            io.emit('user left', { username: user.username });
            delete users[socket.id];
        }
    });
});

// Start the server
server.listen(7861, () => {
    console.log('Server is running on http://localhost:8086');
});