<script lang="ts">
  import { FillLayer, LineLayer, MapLibre, GeoJSONSource, FeatureState, Popup } from 'svelte-maplibre-gl';
  import type * as maplibregl from 'maplibre-gl';

  let hoveredFeature: maplibregl.MapGeoJSONFeature | undefined = $state.raw();
</script>

<MapLibre
  class="h-[55vh] min-h-75"
  style="https://basemaps.cartocdn.com/gl/dark-matter-gl-style/style.json"
  zoom={2}
  center={{ lng: -100.486052, lat: 37.830348 }}
>
  <GeoJSONSource data="https://maplibre.org/maplibre-gl-js/docs/assets/us_states.geojson">
    <FillLayer
      paint={{
        'fill-color': '#00ff55',
        // Change the opacity for the hovered feature
        'fill-opacity': ['case', ['boolean', ['feature-state', 'hover'], false], 0.4, 0.1]
      }}
      onmousemove={(ev) => {
        // Listen to mousemove events to track the hovered feature
        hoveredFeature = ev.features?.[0];
      }}
      onmouseleave={() => (hoveredFeature = undefined)}
    />
    <LineLayer
      paint={{
        'line-color': '#00ff55',
        // Change the opacity for the hovered feature
        'line-opacity': ['case', ['boolean', ['feature-state', 'hover'], false], 1, 0.3],
        'line-width': 1
      }}
    />
    {#if hoveredFeature}
      <!-- Set the hover state on the source for the hovered feature -->
      <FeatureState id={hoveredFeature.id} state={{ hover: true }} />
      <Popup trackPointer closeButton={false}>{hoveredFeature.properties.STATE_NAME}</Popup>
    {/if}
  </GeoJSONSource>
</MapLibre>