function analysis () {
  let result = {}
  let args = location.search.substr(1)
  args = args.split('&')
  args.forEach(arg => {
    let index = arg.indexOf('=')
    if (~index) {
      result[arg.substring(0, index)] = Number(arg.substr(index + 1))
    }
  })

  if (!result.lat || !result.lon) {
    result.lat = 22.252832648721693
    result.lon = 113.57727389730132
  }

  result.zoom = result.zoom || 16
  result.pitch = result.pitch || 60
  result.bearing = result.bearing || 60
  return result
}

let listStatus = (() => {
  let args = analysis()
  return function () {
    let result = []
    let center = map.getCenter()
    args.lon = center.x
    args.lat = center.y
    args.zoom = map.getZoom()
    args.pitch = map.getPitch()
    args.bearing = map.getBearing()

    for (let key in args) {
      result.push(`${key}=${args[key]}`)
    }


    let url = location.pathname + '?' + result.join('&')
    history.pushState({
      url, 
      title: document.title 
    }, document.title, url)
  }
})()


function mapGoto(args, duration = 1000) {
  // map.animateTo({
  //   center: [(map.getCenter().x + args.center[0]) / 2,
  //   (map.getCenter().y + args.center[1]) / 2],
  //   zoom: 15
  // }, {duration: 2000});

  // setTimeout(() => {
    map.animateTo(args, {duration});
  // }, 2000)
}

export {
  mapGoto,
  analysis, 
  listStatus
}