// Importing express module
const express = require("express");

const port = 8080;
const app = express();
const { networkInterfaces } = require('os');
const nets = networkInterfaces();
const results = Object.create(null); // Or just '{}', an empty object

app.use(express.json());
app.use(express.urlencoded({ extended: true }));
app.use(express.static('public'));

for (const name of Object.keys(nets)) {
    for (const net of nets[name]) {
        // Skip over non-IPv4 and internal (i.e. 127.0.0.1) addresses
        // 'IPv4' is in Node <= 17, from 18 it's a number 4 or 6
        const familyV4Value = typeof net.family === 'string' ? 'IPv4' : 4
        if (net.family === familyV4Value && !net.internal) {
            if (!results[name]) {
                results[name] = [];
            }
            results[name].push(net.address);
        }
    }
}

// Handling the get request
app.get("/", (req, res) => {
    res.send("Hello World");
});

app.get("/ip", (req, res) => {
    res.send(results);
});

// Starting the server on the 80 port
app.listen(port, () => {
    console.log(`The application started
                 successfully on port ${port}`);
    console.log(`IP address ${JSON.stringify(results)}`);
});

module.exports = app