Add building scene layer

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// Copyright 2025 Esri.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
// You may obtain a copy of the License at: http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific
// language governing permissions and limitations under the License.

using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using System;
using System.Linq;
using System.Threading.Tasks;

namespace ArcGIS.WinUI.Samples.AddBuildingSceneLayer
{
    [ArcGIS.Samples.Shared.Attributes.Sample(
        name: "Add building scene layer",
        category: "Layers",
        description: "Add a layer to a local scene to visualize and interact with 3D building models developed using Building Information Modeling (BIM) tools.",
        instructions: "When loaded, the sample displays a scene with a Building Scene Layer. By default, the Overview sublayer is visible, showing the building's exterior shell. Use the \"Full Model\" toggle to switch to the Full Model sublayer, which reveals the building's components. Pan around and zoom in to observe the detailed features such as walls, light fixtures, mechanical systems, and more, both outside and inside the building.",
        tags: new[] { "3D", "buildings", "elevation", "layers", "scene", "surface" })]
    [ArcGIS.Samples.Shared.Attributes.OfflineData()]
    public partial class AddBuildingSceneLayer
    {
        private BuildingSublayer _overviewSublayer;
        private BuildingSublayer _fullModelSublayer;

        public AddBuildingSceneLayer()
        {
            InitializeComponent();
            _ = Initialize();
        }

        private async Task Initialize()
        {
            // Create a new scene with topographic basemap and a local scene viewing mode.
            var scene = new Scene(SceneViewingMode.Local, BasemapStyle.ArcGISTopographic);

            // Add world elevation source to the scene's surface.
            var elevationSource = new ArcGISTiledElevationSource(
                new Uri("https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer"));
            scene.BaseSurface.ElevationSources.Add(elevationSource);

            // Set the scene's initial viewpoint.
            var camera = new Camera(
                new MapPoint(-13045148, 4036775, 454, SpatialReferences.WebMercator),
                heading: 343,
                pitch: 64,
                roll: 0);
            scene.InitialViewpoint = new Viewpoint(camera.Location, camera);

            // Set the scene.
            MySceneView.Scene = scene;

            // Add the Building Scene Layer.
            var buildingSceneLayer = new BuildingSceneLayer(
                new Uri("https://www.arcgis.com/home/item.html?id=669f6279c579486eb4a0acc7eb59d7ca"));

            // Sets the altitude offset of the building scene layer.
            // The altitude offset is set to align the model with the ground surface.
            buildingSceneLayer.AltitudeOffset = 1;

            // Load the building scene layer.
            await buildingSceneLayer.LoadAsync();

            // Add the building scene layer to the scene's operational layers.
            scene.OperationalLayers.Add(buildingSceneLayer);

            // Get the overview and full model sublayers for the toggle.
            var sublayers = buildingSceneLayer.Sublayers;
            _overviewSublayer = sublayers.FirstOrDefault(s => s.ModelName == "Overview");
            _fullModelSublayer = sublayers.FirstOrDefault(s => s.ModelName == "FullModel");

            // Enable checkbox only if full model sublayer exists.
            FullModelCheckBox.IsEnabled = _fullModelSublayer != null;

            // Wire up checkbox event.
            FullModelCheckBox.Checked += OnCheckBoxChanged;
            FullModelCheckBox.Unchecked += OnCheckBoxChanged;

            // Set the initial visibility of sublayers based on the checkbox's current state.
            UpdateSublayerVisibility(FullModelCheckBox.IsChecked == true);
        }

        // Event handler that is called when the checkbox state changes.
        private void OnCheckBoxChanged(object sender, Microsoft.UI.Xaml.RoutedEventArgs e)
        {
            UpdateSublayerVisibility(FullModelCheckBox.IsChecked == true);
        }

        // Method to update the visibility of the overview and full model sublayers.
        // This does not affect the 'isVisible' property of the individual sublayers within the full model.
        private void UpdateSublayerVisibility(bool showFullModel)
        {
            if (_fullModelSublayer != null)
                _fullModelSublayer.IsVisible = showFullModel;

            if (_overviewSublayer != null)
                _overviewSublayer.IsVisible = !showFullModel;
        }
    }
}