gc-wing/apps/web/src/widgets/map3d/lib/layerHelpers.ts

import maplibregl, {
  type GeoJSONSourceSpecification,
  type LayerSpecification,
} from 'maplibre-gl';

export function ensureGeoJsonSource(
  map: maplibregl.Map,
  sourceId: string,
  data: GeoJSON.GeoJSON,
) {
  const existing = map.getSource(sourceId);
  if (existing) {
    (existing as maplibregl.GeoJSONSource).setData(data);
  } else {
    map.addSource(sourceId, {
      type: 'geojson',
      data,
    } satisfies GeoJSONSourceSpecification);
  }
}

export function ensureLayer(
  map: maplibregl.Map,
  spec: LayerSpecification,
  options?: { before?: string },
) {
  if (map.getLayer(spec.id)) return;
  const before = options?.before && map.getLayer(options.before) ? options.before : undefined;
  map.addLayer(spec, before);
}

export function setLayerVisibility(map: maplibregl.Map, layerId: string, visible: boolean) {
  if (!map.getLayer(layerId)) return;
  try {
    map.setLayoutProperty(layerId, 'visibility', visible ? 'visible' : 'none');
  } catch {
    // ignore
  }
}

export function cleanupLayers(
  map: maplibregl.Map,
  layerIds: string[],
  sourceIds: string[],
) {
  requestAnimationFrame(() => {
    for (const id of layerIds) {
      try {
        if (map.getLayer(id)) map.removeLayer(id);
      } catch {
        // ignore
      }
    }
    for (const id of sourceIds) {
      try {
        if (map.getSource(id)) map.removeSource(id);
      } catch {
        // ignore
      }
    }
  });
}