const WebSocket = require('ws');
const http = require('http');
const request = require('request');

const client = require('prom-client');

 const register = client.register

const port = 3000

const requestHandler = (request, response) => {
  response.end(register.metrics())
}

const server = http.createServer(requestHandler)

server.listen(port, (err) => {
  if (err) {
    return console.log('something bad happened', err)
  }

  console.log(`server is listening on ${port}`)
})


const hosts = [
  '123.123.123.123'
]
const ports = [
  '8001'
]

const sentGauge = new client.Gauge({
  name: 'sent',
  help: 'sent data in bytes',
  labelNames: ['host', 'port', 'version']
});
const receivedGauge = new client.Gauge({
  name: 'received',
  help: 'received data in bytes',
  labelNames: ['host', 'port', 'version']
});
const sendingGauge = new client.Gauge({
  name: 'sending',
  help: 'sending data in bytes',
  labelNames: ['host', 'port', 'version']
});
const receivingGauge = new client.Gauge({
  name: 'receiving',
  help: 'receiving data in bytes',
  labelNames: ['host', 'port', 'version']
});

hosts.forEach((host) => {
  ports.forEach((port) => {
    const ws = new WebSocket(`ws://${host}:${port}/1/1/websocket`)

    ws.on('close', () => {
      console.log('close')
      process.exit(1)
    })

    ws.on('error', (err) => {
      console.log('ERROR', err)
      process.exit(1)
    })

    function bytesToSize(bytes) {
       var sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
       if (bytes == 0) return '0 Byte';
       var i = parseInt(Math.floor(Math.log(bytes) / Math.log(1024)));
       return Math.round(bytes / Math.pow(1024, i), 2) + ' ' + sizes[i];
    };

    let version = 'unknown'
    const get_version = (callback) => {
      request({
        url:`http://${host}:${port}/api/help`,
        auth: {user: 'username', pass: 'password'}
      }, (err, res, body) => {
        if (err) console.log(err)
        let foundLine = false
        body.split('\n').forEach((line) => {
          if (line.indexOf('Cloning version') !== -1) {
            foundLine = true
            version = line.split(' ')[9]
            console.log('got version ' + version)
            if(callback) callback()
          }
        })
        if (!foundLine) {
          console.log(body)
        }
      })
    }
    setInterval(get_version, 1000 * 60)
    get_version(() => {
      sentGauge.set({host, port, version}, 0)
      receivedGauge.set({host, port, version}, 0)
      sendingGauge.set({host, port, version}, 0)
      receivingGauge.set({host, port, version}, 0)
      ws.on('message', function incoming(data) {
        try {
          const parsed = JSON.parse(JSON.parse(data.substring(1))[0])
          if (parsed.event_name === 'bandwidth') {
            const {received, sent} = parsed.message
            const {receiving, sending} = parsed.message
            sentGauge.set({host, port, version}, sent)
            receivedGauge.set({host, port, version}, received)
            sendingGauge.set({host, port, version}, sending)
            receivingGauge.set({host, port, version}, receiving)
          }
        } catch (err) {
          console.log(err)
        }
      })
    })
  })
})