const express = require('express');
const os = require('os');
const app = express();
const diskusage = require('diskusage');
const si = require('systeminformation');
const hostname = "localhost";
const port = "3001";

async function getNetworkStats() {
  try {
    const data = await si.networkStats("eno1");
    return data;
  } catch (error) {
    console.error(error);
    return {};
  }
}

async function getCurrentCPULoad() {
  try {
    const data = await si.currentLoad();
    const { currentLoad } = data;
    return currentLoad;
  } catch (error) {
    console.log(error);
    return {};
  }
}


app.get('/server-stats/', (req, res) => {
    const cpuServer = os.cpus()[0].model;
    const totalRam = (os.totalmem() / 1024 ** 3);
    const ramUsage = (os.totalmem() - os.freemem()) / os.totalmem();
    diskusage.check('/', async (err, result) => {
        const totalHddSpace = (result.total / 1024 ** 3);
        const freeHddSpace = (result.available / 1024 ** 3);
	const networkStats = await getNetworkStats();
	const cpuUsage = await getCurrentCPULoad();
        res.json({
            cpuServer,
            cpuUsage,
            ramUsage,
            totalRam,
            totalHddSpace,
            freeHddSpace,
	    networkStats
        });
    });
})

app.listen(port, hostname, () => {
    console.log(`Server running at http://${hostname}:${port}/`);
})