initial commit

lib/models/map_layer.dart

@@ -0,0 +1,56 @@
+enum MapLayerType {
+  openStreetMap,
+  openTopoMap,
+  esriWorldImagery,
+}
+
+class MapLayer {
+  final MapLayerType type;
+  final String name;
+  final String urlTemplate;
+  final String attribution;
+  final int maxZoom;
+
+  const MapLayer({
+    required this.type,
+    required this.name,
+    required this.urlTemplate,
+    required this.attribution,
+    required this.maxZoom,
+  });
+
+  static const openStreetMap = MapLayer(
+    type: MapLayerType.openStreetMap,
+    name: 'OpenStreetMap',
+    urlTemplate: 'https://tile.openstreetmap.org/{z}/{x}/{y}.png',
+    attribution: '© OpenStreetMap contributors',
+    maxZoom: 19,
+  );
+
+  static const openTopoMap = MapLayer(
+    type: MapLayerType.openTopoMap,
+    name: 'OpenTopoMap',
+    urlTemplate: 'https://a.tile.opentopomap.org/{z}/{x}/{y}.png',
+    attribution: '© OpenTopoMap (CC-BY-SA)',
+    maxZoom: 17,
+  );
+
+  static const esriWorldImagery = MapLayer(
+    type: MapLayerType.esriWorldImagery,
+    name: 'ESRI Satellite',
+    urlTemplate:
+        'https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}',
+    attribution: '© Esri',
+    maxZoom: 19,
+  );
+
+  static const List<MapLayer> allLayers = [
+    openStreetMap,
+    openTopoMap,
+    esriWorldImagery,
+  ];
+
+  static MapLayer fromType(MapLayerType type) {
+    return allLayers.firstWhere((layer) => layer.type == type);
+  }
+}