import Map from 'ol/Map';
import View from 'ol/View';
import {defaults as defaultControls} from 'ol/control';
import MousePosition from 'ol/control/MousePosition';
import {createStringXY} from 'ol/coordinate';
import TileLayer from 'ol/layer/Tile';
import OSM from 'ol/source/OSM';

const mousePositionControl = new MousePosition({
  coordinateFormat: createStringXY(4),
  projection: 'EPSG:4326',
  // comment the following two lines to have the mouse position
  // be placed within the map.
  className: 'custom-mouse-position',
  target: document.getElementById('mouse-position'),
  undefinedHTML: ' '
});

const map = new Map({
  controls: defaultControls().extend([mousePositionControl]),
  layers: [
    new TileLayer({
      source: new OSM()
    })
  ],
  target: 'map',
  view: new View({
    center: [0, 0],
    zoom: 2
  })
});

const projectionSelect = document.getElementById('projection');
projectionSelect.addEventListener('change', function(event) {
  mousePositionControl.setProjection(event.target.value);
});

const precisionInput = document.getElementById('precision');
precisionInput.addEventListener('change', function(event) {
  const format = createStringXY(event.target.valueAsNumber);
  mousePositionControl.setCoordinateFormat(format);
});