import Map from '../src/ol/Map.js';
import OSM from '../src/ol/source/OSM.js';
import TileLayer from '../src/ol/layer/Tile.js';
import View from '../src/ol/View.js';
import WMTS from '../src/ol/source/WMTS.js';
import WMTSTileGrid from '../src/ol/tilegrid/WMTS.js';
import {get as getProjection} from '../src/ol/proj.js';
import {getTopLeft, getWidth} from '../src/ol/extent.js';

const projection = getProjection('EPSG:3857');
const projectionExtent = projection.getExtent();
const size = getWidth(projectionExtent) / 256;
const resolutions = new Array(19);
const matrixIds = new Array(19);
for (let z = 0; z < 19; ++z) {
  // generate resolutions and matrixIds arrays for this WMTS
  resolutions[z] = size / Math.pow(2, z);
  matrixIds[z] = z;
}

const map = new Map({
  layers: [
    new TileLayer({
      source: new OSM(),
    }),
    new TileLayer({
      opacity: 0.7,
      source: new WMTS({
        attributions:
          'Tiles © <a href="https://mrdata.usgs.gov/geology/state/"' +
          ' target="_blank">USGS</a>',
        url: 'https://mrdata.usgs.gov/mapcache/wmts',
        layer: 'sgmc2',
        matrixSet: 'GoogleMapsCompatible',
        format: 'image/png',
        projection: projection,
        tileGrid: new WMTSTileGrid({
          origin: getTopLeft(projectionExtent),
          resolutions: resolutions,
          matrixIds: matrixIds,
        }),
        style: 'default',
        wrapX: true,
      }),
    }),
  ],
  target: 'map',
  view: new View({
    center: [-11158582, 4813697],
    zoom: 4,
  }),
});