/**
 * FIRMS Layer: NASA VIIRS Thermal Anomalies (375m).
 * Zeigt aktive Braende, Industriewaerme und Vulkanaktivitaet als Overlay.
 * Datenquelle: NASA GIBS WMTS (kostenlos, kein API-Key).
 */
const FirmsLayer = {
    _viewer: null,
    _layer: null,

    start(viewer) {
        if (this._layer) return;
        this._viewer = viewer;
        var today = new Date().toISOString().slice(0, 10);
        this._layer = viewer.imageryLayers.addImageryProvider(
            new Cesium.WebMapTileServiceImageryProvider({
                url: "https://gibs.earthdata.nasa.gov/wmts/epsg4326/best/wmts.cgi",
                layer: "VIIRS_SNPP_Thermal_Anomalies_375m_All",
                tileMatrixSetID: "250m",
                format: "image/png",
                style: "default",
                time: today,
                tileWidth: 512,
                tileHeight: 512,
                tilingScheme: new Cesium.GeographicTilingScheme(),
                tileMatrixLabels: ["0","1","2","3","4","5","6","7","8"],
                credit: "NASA VIIRS Thermal Anomalies",
            })
        );
        this._layer.alpha = 0.9;
    },

    stop() {
        if (this._layer && this._viewer) {
            this._viewer.imageryLayers.remove(this._layer);
            this._layer = null;
        }
    },
};