const CablesLayer = {
    _viewer: null, _dataSource: null, _count: 0,

    start(viewer) {
        if (this._dataSource) return;
        this._viewer = viewer;
        this._dataSource = new Cesium.GeoJsonDataSource('cables');
        this._fetch();
    },

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

    _fetch() {
        var self = this;
        var statusEl = document.getElementById('status-cables');
        if (statusEl) { statusEl.textContent = 'Lade Seekabel...'; statusEl.classList.add('active'); }
        fetch('/api/submarine-cables')
        .then(function(r) { return r.json(); })
        .then(function(data) {
            self._count = (data.features || []).length;
            return self._dataSource.load(data, {
                stroke: Cesium.Color.fromCssColorString('#00ccff').withAlpha(0.4),
                strokeWidth: 1.5,
                clampToGround: true,
            });
        })
        .then(function() { self._viewer.dataSources.add(self._dataSource); if (statusEl) statusEl.textContent = self._count + ' Kabel'; })
        .catch(function(e) { console.warn('Cables:', e); if (statusEl) statusEl.textContent = 'Fehler'; })
        .finally(function() { setTimeout(function() { if (statusEl) statusEl.classList.remove('active'); }, 5000); });
    },
};