Lab 048 – No really, open a window

struct Lab048: View {

    @State var windowIsOpen = false

    // The root for our scene *outside* of the portal
    @State var rootEntity = Entity()

    // An entity that will render the portal
    @State var portalPlane = ModelEntity(
        mesh: .generatePlane(width: 1.0, height: 1.0),
        materials: [PortalMaterial()]
    )

    var body: some View {
        GeometryReader3D { geometry in
            ZStack {
                RealityView { content in

                    // The root for the content that will appear *inside* the portal
                    let portalContentRoot = Entity()
                    portalContentRoot.scale *= 0.3
                    portalContentRoot.position.y -= 0.5
                    portalContentRoot.components.set(WorldComponent())

                    // We'll load some content to add to the portalContentRoot
                    guard let scene = try? await Entity(named: "SkyOutWindow", in: realityKitContentBundle)
                    else { return }
                    portalContentRoot.addChild(scene)
                    portalPlane.components.set(PortalComponent(target: portalContentRoot))

                    rootEntity.addChild(portalContentRoot)
                    rootEntity.addChild(portalPlane)
                    content.add(rootEntity)
                } update: { content in
                    // Resize the scene based on the size of the reality view content.
                    // Based on the example from Apple https://developer.apple.com/documentation/visionos/displaying-a-3d-environment-through-a-portal
                    let size = content.convert(geometry.size, from: .local, to: .scene)

                    portalPlane.model?.mesh = .generatePlane(
                        width: size.x, height: size.y, cornerRadius: 0.03)

                }

                .opacity(windowIsOpen ? 1.0 : 0.0)
                .frame(depth: 0.4)
                VStack {
                    HStack {
                        Text("Fruits")
                            .font(.title)
                            .frame(height: 60)
                        Spacer()
                        Button(
                            action: {
                                print("nothing is real")
                            },
                            label: {
                                Text("Add")
                            })
                    }
                    .padding(.horizontal, 24)
                    .padding(.top, 12)
                    List {
                        Text("Apple")
                        Text("Banana")
                        Text("Orange")
                    }
                }
                .glassBackgroundEffect()
                .offset(y: windowIsOpen ? -360 : 0)
            }
            .frame(width: geometry.size.width, height: geometry.size.height)
        }
        .ornament(attachmentAnchor: .scene(.bottom)) {
            Button(
                action: {
                    print("button pressed")
                    withAnimation(.easeInOut(duration: 0.3)) {
                        windowIsOpen.toggle()
                    }
                },
                label: {
                    Text("\(windowIsOpen ? "Close" : "Open") Window")
                })
            .glassBackgroundEffect()
        }
    }
}