editor/src/components/MapMaplibreGl.tsx

import React from "react";
import {createRoot} from "react-dom/client";
import MapLibreGl, {type LayerSpecification, type LngLat, type Map, type MapOptions, type SourceSpecification, type StyleSpecification} from "maplibre-gl";
import MaplibreInspect from "@maplibre/maplibre-gl-inspect";
import colors from "@maplibre/maplibre-gl-inspect/lib/colors";
import MapMaplibreGlLayerPopup from "./MapMaplibreGlLayerPopup";
import MapMaplibreGlFeaturePropertyPopup, { type InspectFeature } from "./MapMaplibreGlFeaturePropertyPopup";
import Color from "color";
import ZoomControl from "../libs/zoomcontrol";
import { type HighlightedLayer, colorHighlightedLayer } from "../libs/highlight";
import "maplibre-gl/dist/maplibre-gl.css";
import "../maplibregl.css";
import "../libs/maplibre-rtl";
import MaplibreGeocoder, { type MaplibreGeocoderApi, type MaplibreGeocoderApiConfig } from "@maplibre/maplibre-gl-geocoder";
import "@maplibre/maplibre-gl-geocoder/dist/maplibre-gl-geocoder.css";
import { withTranslation, type WithTranslation } from "react-i18next";
import i18next from "i18next";
import { Protocol } from "pmtiles";

function buildInspectStyle(originalMapStyle: StyleSpecification, coloredLayers: HighlightedLayer[], highlightedLayer?: HighlightedLayer) {
  const backgroundLayer = {
    "id": "background",
    "type": "background",
    "paint": {
      "background-color": "#1c1f24",
    }
  } as LayerSpecification;

  const layer = colorHighlightedLayer(highlightedLayer);
  if(layer) {
    coloredLayers.push(layer);
  }

  const sources: {[key:string]: SourceSpecification} = {};

  Object.keys(originalMapStyle.sources).forEach(sourceId => {
    const source = originalMapStyle.sources[sourceId];
    if(source.type !== "raster" && source.type !== "raster-dem") {
      sources[sourceId] = source;
    }
  });

  const inspectStyle = {
    ...originalMapStyle,
    sources: sources,
    layers: [backgroundLayer].concat(coloredLayers as LayerSpecification[])
  };
  return inspectStyle;
}

type MapMaplibreGlInternalProps = {
  onDataChange?(event: {map: Map | null}): unknown
  onLayerSelect(index: number): void
  mapStyle: StyleSpecification
  mapView: {
    zoom: number,
    center: {
      lng: number,
      lat: number,
    },
    _from: "map" | "app"
  };
  inspectModeEnabled: boolean
  highlightedLayer?: HighlightedLayer
  options?: Partial<MapOptions> & {
    showTileBoundaries?: boolean
    showCollisionBoxes?: boolean
    showOverdrawInspector?: boolean
  }
  replaceAccessTokens(mapStyle: StyleSpecification): StyleSpecification
  onChange(value: {center: LngLat, zoom: number, _from: "map" | "app"}): unknown
} & WithTranslation;

type MapMaplibreGlState = {
  map: Map | null;
  inspect: MaplibreInspect | null;
  geocoder: MaplibreGeocoder | null;
  zoomControl: ZoomControl | null;
  zoom?: number;
};

class MapMaplibreGlInternal extends React.Component<MapMaplibreGlInternalProps, MapMaplibreGlState> {
  static defaultProps = {
    onMapLoaded: () => {},
    onDataChange: () => {},
    onLayerSelect: () => {},
    onChange: () => {},
    options: {} as MapOptions,
  };
  container: HTMLDivElement | null = null;

  constructor(props: MapMaplibreGlInternalProps) {
    super(props);
    this.state = {
      map: null,
      inspect: null,
      geocoder: null,
      zoomControl: null,
    };
    i18next.on("languageChanged", () => {
      this.forceUpdate();
    });
  }


  shouldComponentUpdate(nextProps: MapMaplibreGlInternalProps, nextState: MapMaplibreGlState) {
    let should = false;
    try {
      should = JSON.stringify(this.props) !== JSON.stringify(nextProps) || JSON.stringify(this.state) !== JSON.stringify(nextState);
    } catch(_e) {
      // no biggie, carry on
    }
    return should;
  }

  componentDidUpdate() {
    const map = this.state.map;

    const styleWithTokens = this.props.replaceAccessTokens(this.props.mapStyle);
    if (map) {
      // Maplibre GL now does diffing natively so we don't need to calculate
      // the necessary operations ourselves!
      // We also need to update the style for inspect to work properly
      map.setStyle(styleWithTokens, {diff: true});
      map.showTileBoundaries = this.props.options?.showTileBoundaries!;
      map.showCollisionBoxes = this.props.options?.showCollisionBoxes!;
      map.showOverdrawInspector = this.props.options?.showOverdrawInspector!;

      // set the map view when the prop was updated from outside
      if (this.props.mapView._from === "app") {
        map.jumpTo(this.props.mapView);
      }
    }

    if(this.state.inspect && this.props.inspectModeEnabled !== this.state.inspect._showInspectMap) {
      this.state.inspect.toggleInspector();
    }
    if (this.state.inspect && this.props.inspectModeEnabled) {
      this.state.inspect.setOriginalStyle(styleWithTokens);
      // In case the sources are the same, there's a need to refresh the style
      setTimeout(() => {
        this.state.inspect!.render();
      }, 500);
    }

  }

  componentDidMount() {
    const mapOpts = {
      ...this.props.options,
      container: this.container!,
      style: this.props.mapStyle,
      hash: true,
      maxZoom: 24,
      // make root relative urls in stylefiles work as maplibre gl js does
      // not support this for everything:
      // https://github.com/maplibre/maplibre-gl-js/issues/6818
      transformRequest: (url) => {
        if (url.startsWith("/")) {
          url = `${window.location.origin}${url}`;
        }
        return { url };
      },
      // setting to always load glyphs of CJK fonts from server
      // https://maplibre.org/maplibre-gl-js/docs/examples/local-ideographs/
      localIdeographFontFamily: false
    } satisfies MapOptions;

    const protocol = new Protocol({metadata: true});
    MapLibreGl.addProtocol("pmtiles",protocol.tile);
    const map = new MapLibreGl.Map(mapOpts);

    const mapViewChange = () => {
      const center = map.getCenter();
      const zoom = map.getZoom();
      this.props.onChange({center, zoom, _from: "map"});
    };
    mapViewChange();

    map.showTileBoundaries = mapOpts.showTileBoundaries!;
    map.showCollisionBoxes = mapOpts.showCollisionBoxes!;
    map.showOverdrawInspector = mapOpts.showOverdrawInspector!;

    const geocoder = this.initGeocoder(map);

    const zoomControl = new ZoomControl();
    map.addControl(zoomControl, "top-right");

    const nav = new MapLibreGl.NavigationControl({visualizePitch:true});
    map.addControl(nav, "top-right");

    const tmpNode = document.createElement("div");
    const root = createRoot(tmpNode);

    const inspectPopup = new MapLibreGl.Popup({
      closeOnClick: false
    });

    const inspect = new MaplibreInspect({
      popup: inspectPopup,
      showMapPopup: true,
      showMapPopupOnHover: false,
      showInspectMapPopupOnHover: true,
      showInspectButton: false,
      blockHoverPopupOnClick: true,
      assignLayerColor: (layerId: string, alpha: number) => {
        return Color(colors.brightColor(layerId, alpha)).desaturate(0.5).string();
      },
      buildInspectStyle: (originalMapStyle: StyleSpecification, coloredLayers: HighlightedLayer[]) => buildInspectStyle(originalMapStyle, coloredLayers, this.props.highlightedLayer),
      renderPopup: (features: InspectFeature[]) => {
        if(this.props.inspectModeEnabled) {
          inspectPopup.once("open", () => {
            root.render(<MapMaplibreGlFeaturePropertyPopup features={features} />);
          });
          return tmpNode;
        } else {
          inspectPopup.once("open", () => {
            root.render(<MapMaplibreGlLayerPopup
              features={features}
              onLayerSelect={this.onLayerSelectById}
              zoom={this.state.zoom}
            />,);
          });
          return tmpNode;
        }
      }
    });
    map.addControl(inspect);

    map.on("style.load", () => {
      this.setState({
        map,
        inspect,
        geocoder,
        zoomControl,
        zoom: map.getZoom()
      });
    });

    map.on("data", e => {
      if(e.dataType !== "tile") return;
      this.props.onDataChange!({
        map: this.state.map
      });
    });

    map.on("error", e => {
      console.log("ERROR", e);
    });

    map.on("zoom", _e => {
      this.setState({
        zoom: map.getZoom()
      });
    });

    map.on("dragend", mapViewChange);
    map.on("zoomend", mapViewChange);
  }

  onLayerSelectById = (id: string) => {
    const index = this.props.mapStyle.layers.findIndex(layer => layer.id === id);
    this.props.onLayerSelect(index);
  };

  initGeocoder(map: Map) {
    const geocoderConfig = {
      forwardGeocode: async (config: MaplibreGeocoderApiConfig) => {
        const features = [];
        try {
          const request = `https://nominatim.openstreetmap.org/search?q=${config.query}&format=geojson&polygon_geojson=1&addressdetails=1`;
          const response = await fetch(request);
          const geojson = await response.json();
          for (const feature of geojson.features) {
            const center = [
              feature.bbox[0] +
                  (feature.bbox[2] - feature.bbox[0]) / 2,
              feature.bbox[1] +
                  (feature.bbox[3] - feature.bbox[1]) / 2
            ];
            const point = {
              type: "Feature",
              geometry: {
                type: "Point",
                coordinates: center
              },
              place_name: feature.properties.display_name,
              properties: feature.properties,
              text: feature.properties.display_name,
              place_type: ["place"],
              center
            };
            features.push(point);
          }
        } catch (e) {
          console.error(`Failed to forwardGeocode with error: ${e}`);
        }
        return {
          features
        };
      },
    } as unknown as MaplibreGeocoderApi;
    const geocoder = new MaplibreGeocoder(geocoderConfig, {
      placeholder: this.props.t("Search"),
      maplibregl: MapLibreGl,
    });
    map.addControl(geocoder, "top-left");
    return geocoder;
  }

  render() {
    const t = this.props.t;
    this.state.geocoder?.setPlaceholder(t("Search"));
    this.state.zoomControl?.setLabel(t("Zoom:"));
    return <div
      className="maputnik-map__map"
      role="region"
      aria-label={t("Map view")}
      ref={x => {this.container = x;}}
      data-wd-key="maplibre:map"
    ></div>;
  }
}

const MapMaplibreGl = withTranslation()(MapMaplibreGlInternal);
export default MapMaplibreGl;