const express = require('express')
const cprog = require('child_process')
const path = require('path')

const app = express()
const port = process.env.PORT || 8432

/* Information segment */

let info = {}
let infoTimer

async function requestInfo () {
  return new Promise((resolve, reject) => {
    let proc = cprog.exec('node ' + path.join(__dirname, 'system.js'), (err, stdout) => {
      if (err) return reject(err)
      resolve(JSON.parse(stdout))
    })
  })
}

function update () {
  requestInfo().then((newInfo) => {
    info = newInfo
  }).catch(e => console.error(e))
}

infoTimer = setInterval(update, 8000)
update()

/* Web server segment */

app.use('/status', function (req, res) {
  res.jsonp(info)
})

app.use('/', express.static(path.join(__dirname, 'public')))

app.listen(port, function (argument) {
  console.log('Listening on', port)
})