server.js

const path = require('path');
const http = require('http');
const express = require('express');
const socketio = require('socket.io');
const formatMessage = require('./utils/messages');

const { userJoin, getCurrentUser, userLeave, getRoomUsers } = require('./utils/users');

const app = express();
const server = http.createServer(app);
const io = socketio(server);

// Set static folder - (set 'public' as a static folder to access the frontend)
app.use(express.static(path.join(__dirname, "public")));

const botName = 'ChatCord Bot';

// Run when client connects
io.on('connection', socket => {
    // console.log('New WS Connection...')  // WS - Web Socket

    socket.on('joinRoom', ({ username, room }) => {

        const user = userJoin(socket.id, username, room);
        socket.join(user.room);

        // Welcome current user 
        socket.emit('message', formatMessage(botName, 'Welcome to ChatCord!'));  // Message to the single client

        // Broadcast when a user connects - message to others that a user has joined except to the user itself
        socket.broadcast.to(user.room).emit('message', formatMessage(botName, `${user.username} has joined the chat`)); // used -> .to(user.room) to get the message in a specific room the user joint

        // Sent userrs and room info
        io.to(user.room).emit('roomUsers', {
            room: user.room,
            users: getRoomUsers(user.room)
        });

    })

    // Listen for chatMessage 
    socket.on('chatMessage', msg => {
        const user = getCurrentUser(socket.id);

        io.to(user.room).emit('message', formatMessage(user.username, msg));
    });

    // Runs when client disconnects
    socket.on('disconnect', () => {
        const user = userLeave(socket.id);

        // Send message to the specific room the user was in
        if (user) {
            io.to(user.room).emit('message', formatMessage(botName, `${user.username} has left the chat`)); // message to all the clients in general

            // Sent users and room info
        io.to(user.room).emit('roomUsers', {
            room: user.room,
            users: getRoomUsers(user.room)
        });
        };
    })
})

const PORT = 3000 || process.env.PORT;

server.listen(PORT, () => console.log(`Server running on port ${PORT}`));