'use strict'
/*
  Open Rowing Monitor, https://github.com/laberning/openrowingmonitor

  Initialization file of the Open Rowing Monitor App
*/

import NoSleep from 'nosleep.js'
import { filterObjectByKeys } from './helper.js'

const rowingMetricsFields = ['strokesTotal', 'distanceTotal', 'caloriesTotal', 'power', 'heartrate',
  'heartrateBatteryLevel', 'splitFormatted', 'strokesPerMinute', 'durationTotalFormatted']

export function createApp (app) {
  const mode = window.location.hash
  const appMode = mode === '#:standalone:' ? 'STANDALONE' : mode === '#:kiosk:' ? 'KIOSK' : 'BROWSER'
  app.updateState({ ...app.getState(), appMode })

  let socket

  initWebsocket()
  resetFields()
  requestWakeLock()

  function initWebsocket () {
    // use the native websocket implementation of browser to communicate with backend
    // eslint-disable-next-line no-undef
    socket = new WebSocket(`ws://${location.host}/websocket`)

    socket.addEventListener('open', (event) => {
      console.log('websocket opened')
    })

    socket.addEventListener('error', (error) => {
      console.log('websocket error', error)
      socket.close()
    })

    socket.addEventListener('close', (event) => {
      console.log('websocket closed, attempting reconnect')
      setTimeout(() => {
        initWebsocket()
      }, 1000)
    })

    // todo: we should use different types of messages to make processing easier
    socket.addEventListener('message', (event) => {
      try {
        const data = JSON.parse(event.data)

        let activeFields = rowingMetricsFields
        // if we are in reset state only update heart rate
        if (data.strokesTotal === 0) {
          activeFields = ['heartrate', 'heartrateBatteryLevel']
        }

        const filteredData = filterObjectByKeys(data, activeFields)

        let updatedState = { ...app.getState(), metrics: filteredData }
        if (data.peripheralMode) {
          updatedState = { ...app.getState(), peripheralMode: data.peripheralMode }
        }
        app.updateState(updatedState)
      } catch (err) {
        console.log(err)
      }
    })
  }

  async function requestWakeLock () {
    // Chrome enables the new Wake Lock API only if the connection is secured via SSL
    // This is quite annoying for IoT use cases like this one, where the device sits on the
    // local network and is directly addressed by its IP.
    // In this case the only way of using SSL is by creating a self signed certificate, and
    // that would pop up different warnings in the browser (and also prevents fullscreen via
    // a home screen icon so it can show these warnings). Okay, enough ranting :-)
    // In this case we use the good old hacky way of keeping the screen on via a hidden video.
    const noSleep = new NoSleep()
    document.addEventListener('click', function enableNoSleep () {
      document.removeEventListener('click', enableNoSleep, false)
      noSleep.enable()
    }, false)
  }

  function resetFields () {
    const appState = app.getState()
    // drop all metrics except heartrate
    appState.metrics = filterObjectByKeys(appState.metrics, ['heartrate', 'heartrateBatteryLevel'])
    app.updateState(appState)
  }

  function handleAction (action) {
    switch (action.command) {
      case 'switchPeripheralMode': {
        if (socket)socket.send(JSON.stringify({ command: 'switchPeripheralMode' }))
        break
      }
      case 'reset': {
        resetFields()
        if (socket)socket.send(JSON.stringify({ command: 'reset' }))
        break
      }
      case 'uploadTraining': {
        if (socket)socket.send(JSON.stringify({ command: 'uploadTraining' }))
        break
      }
      default: {
        console.error('no handler defined for action', action)
      }
    }
  }

  return {
    handleAction
  }
}