import KML from '../src/ol/format/KML.js';
import Map from '../src/ol/Map.js';
import Stamen from '../src/ol/source/Stamen.js';
import VectorSource from '../src/ol/source/Vector.js';
import View from '../src/ol/View.js';
import {Circle as CircleStyle, Fill, Stroke, Style} from '../src/ol/style.js';
import {Tile as TileLayer, Vector as VectorLayer} from '../src/ol/layer.js';

const styleCache = {};
const styleFunction = function (feature) {
  // 2012_Earthquakes_Mag5.kml stores the magnitude of each earthquake in a
  // standards-violating <magnitude> tag in each Placemark.  We extract it from
  // the Placemark's name instead.
  const name = feature.get('name');
  const magnitude = parseFloat(name.substr(2));
  const radius = 5 + 20 * (magnitude - 5);
  let style = styleCache[radius];
  if (!style) {
    style = new Style({
      image: new CircleStyle({
        radius: radius,
        fill: new Fill({
          color: 'rgba(255, 153, 0, 0.4)',
        }),
        stroke: new Stroke({
          color: 'rgba(255, 204, 0, 0.2)',
          width: 1,
        }),
      }),
    });
    styleCache[radius] = style;
  }
  return style;
};

const vector = new VectorLayer({
  source: new VectorSource({
    url: 'data/kml/2012_Earthquakes_Mag5.kml',
    format: new KML({
      extractStyles: false,
    }),
  }),
  style: styleFunction,
});

const raster = new TileLayer({
  source: new Stamen({
    layer: 'toner',
  }),
});

const map = new Map({
  layers: [raster, vector],
  target: 'map',
  view: new View({
    center: [0, 0],
    zoom: 2,
  }),
});

const info = $('#info');
info.tooltip({
  animation: false,
  trigger: 'manual',
});

const displayFeatureInfo = function (pixel) {
  info.css({
    left: pixel[0] + 'px',
    top: pixel[1] - 15 + 'px',
  });
  const feature = map.forEachFeatureAtPixel(pixel, function (feature) {
    return feature;
  });
  if (feature) {
    info.attr('data-original-title', feature.get('name')).tooltip('show');
  } else {
    info.tooltip('hide');
  }
};

map.on('pointermove', function (evt) {
  if (evt.dragging) {
    info.tooltip('hide');
    return;
  }
  displayFeatureInfo(map.getEventPixel(evt.originalEvent));
});

map.on('click', function (evt) {
  displayFeatureInfo(evt.pixel);
});
