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)

app.use(express.static(path.join(__dirname, 'client')))

const botName = 'ChatBot'

io.on('connection', socket => {
    socket.on('joinRoom', ({ username, room })=> {
        const user = userJoin(socket.id, username, room)

        socket.join(user.room)

        socket.emit('message', formatMessage(botName, 'Welcome to ChatBox'))

        socket.broadcast
            .to(user.room)
            .emit(
                'message',
                formatMessage(botName, `${user.username} has joined the chat`)
            )
            
            io.to(user.room)
            .emit(
                'roomUsers', {
                room: user.room,
                users: getRoomUsers(user.room)
            })
    })


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

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

    socket.on('disconnect', () => {
        const user = userLeave(socket.id)

        if (user) {
            io.to(user.room)
            .emit(
                'message',
                formatMessage(botName, `${user.username} has left the chat`)
            )

        io.to(user.room)
        .emit(
            'roomUsers', {
                room: user.room,
                users: getRoomUsers(user.room)
            })
        }
    })
})


const PORT = process.env.PORT || 3000

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