app.js

// Creating the Express App
const express = require('express');
const app = express();

// Creating Server
const http = require('http');
const { default: mongoose } = require('mongoose');
const server = http.createServer(app);

// Socket Connection for Chatting
const { Server } = require("socket.io");
const io = new Server(server);

// MongoDB Connection
mongoose.connect('mongodb://127.0.0.1:27017/synapse');
var db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error :'));
db.once('open', function(){
    console.log("Database synapse connected");
});

// Message Schema
const message_schema = new mongoose.Schema({
    sender : String,
    send_date : Date,
    content : String
});
const dmessage = mongoose.model('dmessage', message_schema);
// const rmessage = mongoose.model('rmessage', message_schema);

// Setting views
app.set('view engine', 'ejs');
app.use(express.static(__dirname + '/assets'));

// Middleware for Form Posting
app.use(express.urlencoded({extended : true}));

// END-POINTS
app.get('/', (req, res)=>{
    res.render('index');
})

app.get('/channels', (req, res)=>{
    res.render('channels');
})

app.get('/resources', (req, res)=>{
    res.render('resources');
})

app.get('/hirings', (req, res)=>{
    res.render('hirings');
})

app.get('/Tools', (req, res)=>{
    res.render('tools');
})

app.get('/development', async (req, res)=>{
    const already_chats = await dmessage.find({});
    res.render('development_channel', {already : JSON.stringify(already_chats)});
})

// app.get('/robotics', async (req, res)=>{
//     const already_rchats = await rmessage.find({});
//     res.render('robotics-channel', {already : JSON.stringify(already_rchats)});
// })

app.get('/robotics', (req, res)=>{
    res.render('robotics-channel');
})

// SOCKETS-FOR-CHATTING PART

const users = {};
io.on('connection', socket =>{
    // If any new user joins, let other users connected to the server know!
    socket.on('new-user-joined', name =>{ 
        users[socket.id] = name;
        // socket.broadcast.emit('user-joined', name);
    });

    // If someone sends a message, broadcast it to other people
    socket.on('send', message =>{
        // tryin' savin' that message
        var newMessage = new dmessage({sender : users[socket.id], send_date : new Date(), content : message});
        newMessage.save();
        socket.broadcast.emit('receive', {message: message, name: users[socket.id]});
    });

    // If someone leaves the chat, let others know 
    socket.on('disconnect', message =>{
        // socket.broadcast.emit('left', users[socket.id]);
        delete users[socket.id];
    });
})


// MAKE THE SERVER LISTEN ON PORT-3000
const port = 3000;
server.listen(port, ()=>{
    console.log(`listening on port ${port}`);
})