import _ol_Feature_ from '../src/ol/Feature.js';
import Geolocation from '../src/ol/Geolocation.js';
import _ol_Map_ from '../src/ol/Map.js';
import _ol_View_ from '../src/ol/View.js';
import {defaults as defaultControls} from '../src/ol/control.js';
import Point from '../src/ol/geom/Point.js';
import TileLayer from '../src/ol/layer/Tile.js';
import _ol_layer_Vector_ from '../src/ol/layer/Vector.js';
import _ol_source_OSM_ from '../src/ol/source/OSM.js';
import _ol_source_Vector_ from '../src/ol/source/Vector.js';
import _ol_style_Circle_ from '../src/ol/style/Circle.js';
import _ol_style_Fill_ from '../src/ol/style/Fill.js';
import _ol_style_Stroke_ from '../src/ol/style/Stroke.js';
import _ol_style_Style_ from '../src/ol/style/Style.js';

var view = new _ol_View_({
  center: [0, 0],
  zoom: 2
});

var map = new _ol_Map_({
  layers: [
    new TileLayer({
      source: new _ol_source_OSM_()
    })
  ],
  target: 'map',
  controls: defaultControls({
    attributionOptions: {
      collapsible: false
    }
  }),
  view: view
});

var geolocation = new Geolocation({
  projection: view.getProjection()
});

function el(id) {
  return document.getElementById(id);
}

el('track').addEventListener('change', function() {
  geolocation.setTracking(this.checked);
});

// update the HTML page when the position changes.
geolocation.on('change', function() {
  el('accuracy').innerText = geolocation.getAccuracy() + ' [m]';
  el('altitude').innerText = geolocation.getAltitude() + ' [m]';
  el('altitudeAccuracy').innerText = geolocation.getAltitudeAccuracy() + ' [m]';
  el('heading').innerText = geolocation.getHeading() + ' [rad]';
  el('speed').innerText = geolocation.getSpeed() + ' [m/s]';
});

// handle geolocation error.
geolocation.on('error', function(error) {
  var info = document.getElementById('info');
  info.innerHTML = error.message;
  info.style.display = '';
});

var accuracyFeature = new _ol_Feature_();
geolocation.on('change:accuracyGeometry', function() {
  accuracyFeature.setGeometry(geolocation.getAccuracyGeometry());
});

var positionFeature = new _ol_Feature_();
positionFeature.setStyle(new _ol_style_Style_({
  image: new _ol_style_Circle_({
    radius: 6,
    fill: new _ol_style_Fill_({
      color: '#3399CC'
    }),
    stroke: new _ol_style_Stroke_({
      color: '#fff',
      width: 2
    })
  })
}));

geolocation.on('change:position', function() {
  var coordinates = geolocation.getPosition();
  positionFeature.setGeometry(coordinates ?
    new Point(coordinates) : null);
});

new _ol_layer_Vector_({
  map: map,
  source: new _ol_source_Vector_({
    features: [accuracyFeature, positionFeature]
  })
});