index.js

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


const {addUser, removeUser, getUser, getUsersInRoom} = require('./users');

const PORT = process.env.PORT || 5000;

const router = require('./router');


const app = express();
app.use(cors());

const server = http.createServer(app);
const io = socketio(server,{
    cors: {
      origin: "*",
      methods: ["GET", "POST"]
    }});

app.use(router);

io.on('connection', (socket) => {
    console.log('We have a new connection!!!');

    socket.on('join',({name,room},callback)=>{
        console.log(name,room);
        const {error, user} = addUser({id:socket.id, name, room});

        if(error) return callback(error);

        socket.join(user.room);

        socket.emit('message', {user:'admin',text:`${user.name}, welcome to the room ${user.room}`});
        socket.broadcast.to(user.room).emit('message', {user:'admin', text:`${user.name} has joined`});
        
        io.to(user.room).emit('roomData', { room: user.room, users: getUsersInRoom(user.room) });

        callback();

        
    });

    socket.on('sendMessage', (message) => {
        const user = getUser(socket.id);

        io.to(user.room).emit('message', {user: user.name, text:message});

    })

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

        if(user) {
          io.to(user.room).emit('message', { user: 'Admin', text: `${user.name} has left.` });
          io.to(user.room).emit('roomData', { room: user.room, users: getUsersInRoom(user.room)});
        }
    });
});



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