/**
 * GDELT Nachrichten-Layer: Geokodierte Echtzeit-News.
 */
const GdeltLayer = {
    _viewer: null,
    _dataSource: null,
    _interval: null,
    _count: 0,

    start(viewer) {
        if (this._dataSource) return;
        this._viewer = viewer;
        this._dataSource = new Cesium.CustomDataSource('gdelt');
        viewer.dataSources.add(this._dataSource);
        this._fetch();
        var self = this;
        this._interval = setInterval(function() { self._fetch(); }, 600000);
    },

    stop() {
        if (this._interval) { clearInterval(this._interval); this._interval = null; }
        if (this._dataSource && this._viewer) {
            this._viewer.dataSources.remove(this._dataSource);
            this._dataSource = null;
        }
        this._count = 0;
    },

    _fetch() {
        var self = this;
        fetch('/api/gdelt')
        .then(function(r) { return r.json(); })
        .then(function(data) {
            if (!self._dataSource) return;
            self._dataSource.entities.removeAll();
            var features = data.features || [];
            self._count = features.length;
            features.forEach(function(f) {
                var c = f.geometry.coordinates;
                var p = f.properties || {};
                var title = (p.name || p.title || 'Nachricht').substring(0, 80);
                var url = p.url || '';
                self._dataSource.entities.add({
                    position: Cesium.Cartesian3.fromDegrees(c[0], c[1]),
                    point: {
                        pixelSize: 5,
                        color: Cesium.Color.fromCssColorString('#ff8800'),
                        outlineColor: Cesium.Color.fromCssColorString('#663300'),
                        outlineWidth: 1,
                        heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
                        disableDepthTestDistance: Number.POSITIVE_INFINITY,
                    },
                    description: '<div style="font-family:monospace;font-size:12px;color:#ff8800">' +
                        '<strong>' + title + '</strong>' +
                        (url ? '<br><a href="' + url + '" target="_blank" style="color:#44aaff">Quelle</a>' : '') +
                        '</div>',
                });
            });
        })
        .catch(function(e) { console.warn('GDELT fetch error:', e); });
    },
};