Add scene layer from service

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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.
 *
 */

package com.esri.arcgismaps.sample.addscenelayerfromservice.components

import android.app.Application
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.viewModelScope
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.SpatialReference
import com.arcgismaps.mapping.ArcGISScene
import com.arcgismaps.mapping.ArcGISTiledElevationSource
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.Surface
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.layers.ArcGISSceneLayer
import com.arcgismaps.mapping.view.Camera
import com.esri.arcgismaps.sample.sampleslib.components.MessageDialogViewModel
import kotlinx.coroutines.launch

class AddSceneLayerFromServiceViewModel(app: Application) : AndroidViewModel(app) {
    // URL of the Portland buildings scene server
    private val portlandBuildingsSceneLayerUrl =
        "https://tiles.arcgis.com/tiles/P3ePLMYs2RVChkJx/arcgis/rest/services/Buildings_Portland/SceneServer"

    // URL of the world elevation tiled elevation source
    private val worldElevationServiceUrl =
        "https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer"

    // ArcGISTiledElevationSource for world elevation
    private val elevationSource: ArcGISTiledElevationSource by lazy {
        ArcGISTiledElevationSource(worldElevationServiceUrl)
    }

    // ArcGISSceneLayer for Portland buildings
    private val sceneLayer: ArcGISSceneLayer by lazy {
        ArcGISSceneLayer(portlandBuildingsSceneLayerUrl)
    }

    // Camera location point (Portland, OR)
    private val cameraLocation: Point by lazy {
        Point(
            x = -122.66949,
            y = 45.51869,
            z = 227.0,
            spatialReference = SpatialReference.wgs84()
        )
    }

    // Camera to view the scene
    private val camera: Camera by lazy {
        Camera(
            locationPoint = cameraLocation,
            heading = 219.0,
            pitch = 82.0,
            roll = 0.0
        )
    }

    // Create the ArcGISScene with imagery basemap
    val arcGISScene: ArcGISScene = ArcGISScene(BasemapStyle.ArcGISImagery).apply {
        // Add the Portland buildings scene layer
        operationalLayers.add(sceneLayer)
        // Add the elevation source to the base surface
        baseSurface = Surface().apply {
            elevationSources.add(elevationSource)
        }
        // Set the viewpoint camera at Portland
        initialViewpoint = Viewpoint(
            boundingGeometry = cameraLocation,
            camera = camera
        )
    }

    // Create a message dialog view model for handling error messages
    val messageDialogVM = MessageDialogViewModel()

    init {
        viewModelScope.launch {
            arcGISScene.load().onFailure { messageDialogVM.showMessageDialog(it) }
        }
    }
}