// NOCOMPILE
// this example uses FileSaver.js for which we don't have an externs file.
import Map from '../src/ol/Map.js';
import View from '../src/ol/View.js';
import {defaults as defaultControls} from '../src/ol/control.js';
import GeoJSON from '../src/ol/format/GeoJSON.js';
import {Tile as TileLayer, Vector as VectorLayer} from '../src/ol/layer.js';
import {OSM, Vector as VectorSource} from '../src/ol/source.js';

const map = new Map({
  layers: [
    new TileLayer({
      source: new OSM()
    }),
    new VectorLayer({
      source: new VectorSource({
        url: 'data/geojson/countries.geojson',
        format: new GeoJSON()
      })
    })
  ],
  target: 'map',
  controls: defaultControls({
    attributionOptions: {
      collapsible: false
    }
  }),
  view: new View({
    center: [0, 0],
    zoom: 2
  })
});

document.getElementById('export-png').addEventListener('click', function() {
  map.once('postcompose', function(event) {
    const canvas = event.context.canvas;
    if (navigator.msSaveBlob) {
      navigator.msSaveBlob(canvas.msToBlob(), 'map.png');
    } else {
      canvas.toBlob(function(blob) {
        saveAs(blob, 'map.png');
      });
    }
  });
  map.renderSync();
});