client.ts

// LOADING environmental variables
import * as dotenv from 'dotenv';
dotenv.config();

// IMPORTING 'socket.io-client' module
import { io } from 'socket.io-client';

// IMPORTING readline module to read from console.
import * as readline from 'readline';

const rl = readline.createInterface({
	input: process.stdin,
	output: process.stdout,
});

rl.question(`Enter server address [${process.env.ADDRESS || 'localhost'}]: `, (address) => {
	rl.question(`Enter server port [${process.env.PORT || '3000'}]: `, (port) => {
		if (address === '') address = process.env.ADDRESS || 'localhost';
		if (port === '') port = process.env.PORT || '3000';

		// Creating client at the server
		console.log('Connecting to server...');
		const socket = io(`http://${address}:${port}`, { forceNew: true });

		socket.on('connect', () => {
			console.log('Connected.');
			function newUser() {
				rl.question('Enter your name: ', (username) => {
					socket.emit('new user', username, (res: Array<unknown>) => {
						console.log(res[1]);
						if (res[0] === 200) {
							process.stdout.write('\n> ');
							rl.prompt();
						} else if (res[0] === 400) {
							newUser();
						} else {
							console.log('Something went wrong. Check for updates on the GitHub repo:');
							console.log('https://github.com/Dennis1507/chat/releases');
						}
					});
				});
			}
			newUser();
		});

		socket.on('message', (text) => {
			// Erasing last line
			process.stdout.clearLine(0);
			process.stdout.cursorTo(0);
			console.log(text);
			process.stdout.write('> ');
			rl.prompt(true);
		});

		rl.on('line', (text) => {
			socket.emit('message', text.trim());
			process.stdout.write('> ');
			rl.prompt();
		});
	});
});