require('dotenv').config()
const express = require('express')
const app = express()
const http = require('http')
const socket_io = require('socket.io')
const path = require('path')

app.use(express.static('public', { extensions: ['html'] }))

function serve_index(req, res) { res.sendFile(path.join(__dirname, '../../public', 'index.html')) }
app.get('/dashboard/', serve_index)
app.get('/system/', serve_index)
app.get('/checkpoints/', serve_index)
app.get('/datasets/', serve_index)
app.get('/live/', serve_index)
app.get('/', serve_index)
// app.get('/images', site.images)
// app.post('/print', bodyParser.urlencoded({ extended: false }), site.print)
// app.use('/upload', require('./upload'))

let server = http.createServer(app)
server.listen(process.env.EXPRESS_PORT, () => {
  console.log('Cortex remote listening on http://localhost:' + process.env.EXPRESS_PORT)
})

const io = socket_io(server)
let relay, client

client = io.of('/client')
client.on('connect', bind_client)

if (process.env.EXPRESS_CONNECTS_TO_RELAY === 'true') {
  console.log('Connecting to relay on ' + process.env.RELAY_REMOTE)
  relay = require('socket.io-client').connect(process.env.RELAY_REMOTE)
  bind_relay(relay)
} else {
  relay = io.of('/relay')
  relay.on('connect', bind_relay)
}

function bind_relay(socket) {
  console.log('Relay connected')
  socket.on('res', data => {
    console.log('Received response', data.cmd)
    client.emit('res', data)
  })

  socket.on('status', data => {
    console.log('Received status', data.key)
    client.emit('status', data)
  })

  socket.on('system_res', data => {
    console.log('System responded', data.cmd)
    client.emit('system_res', data)
  })

  socket.on('frame', (data) => {
    client.volatile.emit('frame', data)
  })

  socket.on('disconnect', () => {
    console.log('Relay disconnected')
  })
}

function bind_client(socket){
  console.log('Client connected')
  socket.on('cmd', data => {
    console.log('Client sent command', data)
    relay.emit('cmd', data)
  })
  
  socket.on('system', data => {
    console.log('Client sent system command', data)
    relay.emit('system', data)
  })

  socket.on('disconnect', () => {
    console.log('Client disconnected')
  })
}