import './style.css';
import {Map, View} from 'ol';
import Feature from 'ol/Feature';
import GeoJSON from 'ol/format/GeoJSON';
import Overlay from 'ol/Overlay';
import Point from 'ol/geom/Point';
import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer';
import {Circle as CircleStyle, Fill, Icon, Stroke, Style} from 'ol/style';
import {OSM, Vector as VectorSource} from 'ol/source';
import {useGeographic} from 'ol/proj';
import geojsonRoute from './data/r2b22-route.json'
import geojsonPOI from './data/r2b22-poi.json';
import geojsonLegacy from './data/legacy-route.json';

useGeographic();

async function main() {
  const styles = {
    lineOrange: new Style({
      stroke: new Stroke({
        color: '#FF9900',
        // lineDash: [8],
        width: 5,
      }),
    }),
    lineGrey: new Style({
      stroke: new Stroke({
        color: '#555555',
        // lineDash: [8],
        width: 5,
      }),
    }),
    iconStop: new Style({
      image: new Icon({
        anchor: [0.5, 46],
        anchorXUnits: 'fraction',
        anchorYUnits: 'pixels',
        src: '/img/icon.png',
      }),
    }),
    iconVan: new Style({
      image: new Icon({
        anchor: [0.5, 16],
        anchorXUnits: 'fraction',
        anchorYUnits: 'pixels',
        src: '/img/van-100px.png',
      }),
    }),
    circleBlack: new Style({
      image: new CircleStyle({
        radius: 7,
        fill: new Fill({color: '#FF9900'}),
        stroke: new Stroke({
          color: 'white',
          width: 2,
        }),
      })
    })
  }

  //
  // Route
  //

  const tourStatus = await fetch('https://r2b22.kip.pe/status.json').then(res => res.json());

  const lastStageFinished = tourStatus.lastStageFinished;
  const stagesCompleted = geojsonRoute.features.slice(0, lastStageFinished);
  const stagesAhead = geojsonRoute.features.slice(lastStageFinished);
  const vectorSourceStagesCompleted = new VectorSource();
  const vectorSourceStagesAhead = new VectorSource();

  for (const stage of stagesCompleted) {
    vectorSourceStagesCompleted.addFeature(new GeoJSON().readFeature(stage));
  }
  for (const stage of stagesAhead) {
    vectorSourceStagesAhead.addFeature(new GeoJSON().readFeature(stage));
  }

  const stagesCompletedLayer = new VectorLayer({
    source: vectorSourceStagesCompleted,
    style: styles.lineOrange
  });

  const stagesAheadLayer = new VectorLayer({
    source: vectorSourceStagesAhead,
    style: styles.lineGrey
  });

  //
  // Points of Interest
  //

  const vectorSourcePOI = new VectorSource({
    features: new GeoJSON().readFeatures(geojsonPOI),
  });

  const poiLayer = new VectorLayer({
    source: vectorSourcePOI,
    style: styles.circleBlack,
  });

  const vectorSourceTrackedPoints = new VectorSource();

  const vanFeature= new Feature({
    geometry: new Point([8.918618, 44.407408]),
    name: 'Support Van'
  });

  vectorSourceTrackedPoints.addFeature(vanFeature);

  const trackedPointsLayer = new VectorLayer({
    source: vectorSourceTrackedPoints,
    style: styles.iconVan
  });

  //
  // Legacy routes
  //

  const vectorSourceLegacy = new VectorSource();
  vectorSourceLegacy.addFeatures(new GeoJSON().readFeatures(geojsonLegacy));

  const legacyLayer = new VectorLayer({
    source: vectorSourceLegacy,
    style: styles.lineOrange
  });

  //
  // Map initialization
  //

  const view = new View({
    center: [10.6, 46.9],
    zoom: 6.6
  })

  window.view = view;

  const map = new Map({
    target: 'map',
    layers: [
      new TileLayer({
        source: new OSM()
      }),
      stagesCompletedLayer,
      stagesAheadLayer,
      legacyLayer,
      poiLayer,
      trackedPointsLayer
    ],
    view: view
  });

  //
  // Center map on current/next stage
  //

  setTimeout(() => {
    const nextStageFeature = new GeoJSON().readFeature(stagesAhead[0]);
    view.fit(nextStageFeature.getGeometry(), {
      maxZoom: 10,
      duration: 1000
    });
  }, 3000);

  //
  // Popups
  //
  const popupEl = document.getElementById('popup');

  const popup = new Overlay({
    element: popupEl,
    positioning: 'bottom-center',
    stopEvent: false,
  });
  map.addOverlay(popup);

  let popover;
  function disposePopover() {
    if (popover) {
      popover.dispose();
      popover = undefined;
    }
  }

  function createPopoverHtml(feature) {
    const container = document.createElement('div');
    const title = document.createElement('div');
    title.textContent = feature.get('name');
    container.append(title);
    return container.innerHTML;
  }

  // display popup on click
  map.on('click', function (evt) {
    const feature = map.forEachFeatureAtPixel(evt.pixel, function (feature) {
      return feature;
    });
    disposePopover();
    if (!feature) return;
    popup.setPosition(evt.coordinate);
    popover = new bootstrap.Popover(popupEl, {
      placement: 'top',
      html: true,
      content: createPopoverHtml(feature)
    });
    popover.show();
  });

  // change mouse cursor when over marker
  map.on('pointermove', function (evt) {
    map.getTargetElement().style.cursor = map.hasFeatureAtPixel(evt.pixel)
      ? 'pointer'
      : '';
  });

  // Close the popup when the map is moved
  map.on('movestart', disposePopover);

  //
  // Tracking
  //

  const updateInterval = 10000;
  const peopleOverlays = {};

  function createParticipantHTML (name) {
    if (document.getElementById(`user-${name}`)) return;
    const el = document.createElement('img');
    el.src = `https://r2b22.kip.pe/avatars/${name}.png`;
    el.id = `user-${name}`;
    el.style = 'width: 40px; height: 40px; border-radius: 20px; cursor: pointer';
    document.getElementById('people').append(el);
  }

  function createParticipantOverlay (name) {
    if (peopleOverlays[name]) return;
    const overlayElement = new Overlay({
      stopEvent: false,
      positioning: 'center-center',
      element: document.getElementById(`user-${name}`)
    });
    peopleOverlays[name] = overlayElement;
    map.addOverlay(overlayElement);
  }

  function isRecentTimestamp (tst) {
    // newer than 2 hours ago?
    return (tst * 1000) > (Date.now() - 2*60*60*1000);
  }

  function updateData(startInterval=false) {
    fetch('https://r2b22.kip.pe/last.json')
      .then(response => response.json())
      .then(data => {
        const vanData = data.find(i => i.name == 'satoshithevan');
        const vanCoords = [vanData.lon, vanData.lat];
        vanFeature.getGeometry().setCoordinates(vanCoords);

        for (const item of data) {
          if (!tourStatus.participants.includes(item.name)) continue;
          if (!isRecentTimestamp(item.tst)) continue;
          createParticipantHTML(item.name);
          createParticipantOverlay(item.name);
          const overlay = peopleOverlays[item.name];
          overlay.setPosition([item.lon, item.lat]);

          function clickHandler () {
            disposePopover();
            popup.setPosition([item.lon, item.lat]);
            popover = new bootstrap.Popover(popupEl, {
              placement: 'top',
              html: true,
              content: `Rider: ${item.name}`
            });
            popover.show();
          }

          const avatarEl = document.getElementById(`user-${item.name}`);
          avatarEl.removeEventListener('click', clickHandler);
          avatarEl.addEventListener('click', clickHandler);
        }
      });

    if (startInterval) {
      setInterval(updateData, updateInterval);
    }
  }

  updateData(true);
}

main();