Show realistic light and shadows

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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.showrealisticlightandshadows.components

import android.app.Application
import androidx.compose.runtime.MutableState
import androidx.compose.runtime.mutableStateOf
import androidx.compose.ui.graphics.Color
import androidx.lifecycle.AndroidViewModel
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.AtmosphereEffect
import com.arcgismaps.mapping.view.Camera
import com.arcgismaps.mapping.view.LightingMode
import com.arcgismaps.mapping.view.SpaceEffect
import com.esri.arcgismaps.sample.sampleslib.components.MessageDialogViewModel

class ShowRealisticLightAndShadowsViewModel(application: Application) : AndroidViewModel(application) {

    val arcGISScene = ArcGISScene(BasemapStyle.ArcGISTopographic).apply {
        // Add a base surface with elevation source
        baseSurface = Surface().apply {
            // Create an elevation source from Terrain3D REST service
            elevationSources.add(
                ArcGISTiledElevationSource(
                    "https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer"
                )
            )
        }
        // Create a scene layer from buildings REST service
        operationalLayers.add(
            ArcGISSceneLayer(
                "https://tiles.arcgis.com/tiles/P3ePLMYs2RVChkJx/arcgis/rest/services/DevA_BuildingShells/SceneServer"
            )
        )
        // Create a point to center on
        val point = Point(
            x = -122.69033,
            y = 45.54605,
            z = 500.0,
            spatialReference = SpatialReference.wgs84()
        )
        initialViewpoint = Viewpoint(
            center = point,
            scale = 17000.0,
            camera = Camera(
                locationPoint = point,
                heading = 162.58544,
                pitch = 72.0,
                roll = 0.0
            )
        )
    }

    // Create a LightingOptionsState with default values that will be used by the scene view
    val lightingOptionsState = LightingOptionsState(
        mutableStateOf(LightingMode.LightAndShadows),
        mutableStateOf(Color(red = 220, green = 220, blue = 220, alpha = 255)),
        mutableStateOf(AtmosphereEffect.HorizonOnly),
        mutableStateOf(SpaceEffect.Stars)
    )

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

/**
 * Represents various lighting options used by the composable scene view.
 */
data class LightingOptionsState(
    val sunLighting: MutableState<LightingMode>,
    val ambientLightColor: MutableState<Color>,
    val atmosphereEffect: MutableState<AtmosphereEffect>,
    val spaceEffect: MutableState<SpaceEffect>
)