import Meta

public enum Backend2 {

    public struct TestWidget2: BackendWidget {
    
        public init() { }
    
        public func container<WidgetType>(modifiers: [(AnyView) -> AnyView], type: WidgetType.Type) -> ViewStorage {
            print("Init test widget 2")
            let storage = ViewStorage(nil)
            storage.fields["test"] = 0
            return storage
        }

        public func update<WidgetType>(_ storage: ViewStorage, modifiers: [(AnyView) -> AnyView], updateProperties: Bool, type: WidgetType.Type) {
            print("Update test widget 2 (#\(storage.fields["test"] ?? ""))")
            storage.fields["test"] = (storage.fields["test"] as? Int ?? 0) + 1
        }
    
    }
    
    public struct TestWidget4: BackendWidget {

        public init() { }

        public func container<WidgetType>(modifiers: [(AnyView) -> AnyView], type: WidgetType.Type) -> ViewStorage {
            print("Init test widget 4")
            let storage = ViewStorage(nil)
            storage.fields["test"] = 0
            return storage
        }

        public func update<WidgetType>(_ storage: ViewStorage, modifiers: [(AnyView) -> AnyView], updateProperties: Bool, type: WidgetType.Type) {
            print("Update test widget 4 (#\(storage.fields["test"] ?? ""))")
            storage.fields["test"] = (storage.fields["test"] as? Int ?? 0) + 1
        }

    }

    public protocol BackendWidget: Widget { }

    public protocol BackendSceneElement: SceneElement { }

    public class Backend2App: AppStorage {

        public typealias SceneElementType = BackendSceneElement
        public typealias WidgetType = BackendWidget

        public var app: () -> any App
        public var sceneStorage: [SceneStorage] = []

        public required init(id: String, app: @escaping () -> any App) {
            self.app = app
        }

        public func run(setup: @escaping () -> Void) {
            setup()
        }

        public func quit() {
            fatalError("Quit")
        }

    }

}