NativeScriptApp.swift

import SwiftUI
import Observation
import WorldAssets

@main
struct NativeScriptApp: App {

    // The view model.
    @State private var model = EnvData.model

    // The immersion styles for different modules.
    @State private var orbitImmersionStyle: ImmersionStyle = .mixed
    @State private var solarImmersionStyle: ImmersionStyle = .full

    var body: some Scene {
        // Your NativeScript Main Window
        NativeScriptMainWindow()
        
        // A volume that displays a globe.
        WindowGroup(id: Module.globe.name) {
            Globe()
                .environment(model)
        }
        .windowStyle(.volumetric)
        .defaultSize(width: 0.6, height: 0.6, depth: 0.6, in: .meters)

        // An immersive space that places the Earth with some of its satellites
        // in your surroundings.
        ImmersiveSpace(id: Module.orbit.name) {
            Orbit()
                .environment(model)
        }
        .immersionStyle(selection: $orbitImmersionStyle, in: .mixed)

        // An immersive Space that shows the Earth, Moon, and Sun as seen from
        // Earth orbit.
        ImmersiveSpace(id: Module.solar.name) {
            SolarSystem()
                .environment(model)
        }
        .immersionStyle(selection: $solarImmersionStyle, in: .full)
    }

    init() {
        // Register all the custom components and systems that the app uses.
        RotationComponent.registerComponent()
        RotationSystem.registerSystem()
        TraceComponent.registerComponent()
        TraceSystem.registerSystem()
        SunPositionComponent.registerComponent()
        SunPositionSystem.registerSystem()
    }
}

class EnvData {
    static var model = ViewModel()
}