import timeDistance, { deLocale } from 'js/util/timeDistance'

const spaceapiUrl = "https://spaceapi.hamburg.ccc.de"
const interval_ms = 60000

const classNameOpen = "open"
const classNameClosed = "closed"


function updateRoomState(openState, lastChangeTimestamp) {
  console.debug("SpaceAPI: Setting room " + openState + " since " + lastChangeTimestamp)

  const roomstate = document.querySelector('#roomstate')
  var statusItem = roomstate.querySelector(".state")
  var durationItem = roomstate.querySelector(".duration")

  if (openState === null || lastChangeTimestamp === null) {
    console.warn("SpaceAPI: Room state unknown");
    statusItem.textContent = "unbekannt"
    roomstate.classList.remove(classNameOpen)
    roomstate.classList.remove(classNameClosed)
    durationItem.textContent = "(seit unbekannt)"

  } else {
    if (openState) {
      statusItem.textContent = "offen"
      roomstate.classList.remove(classNameClosed)
      roomstate.classList.add(classNameOpen)

    } else {
      statusItem.textContent = "geschlossen"
      roomstate.classList.remove(classNameOpen)
      roomstate.classList.add(classNameClosed)

    }

    const changeDate = new Date(lastChangeTimestamp * 1000)
    const changeText = timeDistance(deLocale).inWords(changeDate)

    durationItem.textContent = "(" + changeText + ")"
  }
}

function parseResponse(apiJson) {
  console.debug('SpaceAPI got:', apiJson)

  if (typeof apiJson.api === "undefined") {
    console.error("SpaceAPI JSON invalid: 'api' item not present")
    return [null, null]
  }
  if (typeof apiJson.state === "undefined") {
    console.error("SpaceAPI JSON invalid: 'state' item not present")
    return [null, null]
  }
  if (typeof apiJson.state.open === "undefined") {
    console.error("SpaceAPI JSON invalid: 'state.open' item not present")
    return [null, null]
  }

  console.debug('SpaceAPI state:', apiJson.state)
  var openState = (apiJson.state.open == true)
  var lastchange = null

  if (apiJson.state.lastchange !== "undefined") {
    lastchange = apiJson.state.lastchange
  }

  return [openState, lastchange]
}

function update() {
  fetch(spaceapiUrl)
    .then(resp => resp.json())
    .then(function (data) {
      var state = parseResponse(data)
      updateRoomState(state[0], state[1])
    })
    .catch(err => { throw err });
}

window.onload = function () {
  update()
  window.setTimeout(update, interval_ms)
}