import Map from '../../../../src/ol/Map.js';
import View from '../../../../src/ol/View.js';
import MultiPolygon from '../../../../src/ol/geom/MultiPolygon.js';
import TileLayer from '../../../../src/ol/layer/Tile.js';
import {getVectorContext} from '../../../../src/ol/render.js';
import XYZ from '../../../../src/ol/source/XYZ.js';
import Stroke from '../../../../src/ol/style/Stroke.js';
import Style from '../../../../src/ol/style/Style.js';

const source = new XYZ({
  url: '/data/tiles/osm/{z}/{x}/{y}.png',
  transition: 0,
});

const layer = new TileLayer({
  source: source,
});

const geometry = new MultiPolygon([
  [
    [
      [-80, -40],
      [-40, 0],
      [-80, 40],
      [-120, 0],
      [-80, -40],
    ],
  ],
  [
    [
      [80, -40],
      [120, 0],
      [80, 40],
      [40, 0],
      [80, -40],
    ],
  ],
]).transform('EPSG:4326', 'EPSG:3857');

const style = new Style({
  stroke: new Stroke({
    width: 2,
    color: 'blue',
  }),
});

layer.on('prerender', function (event) {
  const context = event.context;
  context.save();

  const vectorContext = getVectorContext(event);
  vectorContext.setStyle(style);
  vectorContext.drawGeometry(geometry);

  context.clip();
});

layer.on('postrender', function (event) {
  const context = event.context;
  context.restore();

  const vectorContext = getVectorContext(event);
  vectorContext.setStyle(style);
  vectorContext.drawGeometry(geometry);
});

new Map({
  pixelRatio: 1,
  target: 'map',
  layers: [layer],
  view: new View({
    center: [0, 0],
    zoom: 0,
  }),
});

render();