interface RootComponent {

    val childStack: Value<ChildStack<*, Child>>

    fun onBackClicked(toIndex: Int)

    fun onHomeTabClicked()
    fun onCartTabClicked()
    fun onProfileTabClicked()


    // Определяет все возможные дочерние компоненты
    sealed class Child {
        class HomeChild(val component: HomeComponent) : Child()
        class CartChild(val component: CartComponent) : Child()
        class ProfileChild(val component: ProfileComponent) : Child()
    }
}


class DefaultRootComponent(componentContext: ComponentContext):RootComponent,ComponentContext by componentContext {

    private val navigation = StackNavigation<Config>()

    override val childStack: Value<ChildStack<*, RootComponent.Child>> =
        childStack(
            source = navigation,
            serializer = Config.serializer(),
            initialConfiguration = Config.Home, // // Исходный дочерний компонент — Home
            handleBackButton = true, // Автоматически извлекать из стека при нажатии кнопки «Назад»
            childFactory = ::child,
        )

    private fun child(config: Config, componentContext: ComponentContext): RootComponent.Child =
        when (config) {
            is Config.Home -> HomeChild(homeComponent(componentContext))
            is Config.Cart -> CartChild(cartComponent(componentContext))
            is Config.Profile -> ProfileChild(profileComponent(componentContext))
        }

    private fun homeComponent(componentContext: ComponentContext): HomeComponent =
        DefaultHomeComponent(componentContext = componentContext)

    private fun cartComponent(componentContext: ComponentContext): CartComponent =
        DefaultCartComponent(componentContext = componentContext)

    private fun profileComponent(componentContext: ComponentContext): ProfileComponent =
        DefaultProfileComponent(componentContext = componentContext)



    override fun onBackClicked(toIndex: Int) { navigation.popTo(index = toIndex) }

    override fun onHomeTabClicked() {
      navigation.bringToFront(Config.Home)
    }

    override fun onCartTabClicked() {
        navigation.bringToFront(Config.Cart)
    }

    override fun onProfileTabClicked() {
        navigation.bringToFront(Config.Profile)
    }

    @Serializable // kotlinx-serialization plugin must be applied
    private sealed interface Config {
        @Serializable
        data object Home : Config

        @Serializable
        data object Cart : Config

        @Serializable
        data object Profile : Config

//        @Serializable
//        data class Cart(val item: String) : Config
//
//        @Serializable
//        data class Profile(val item: String) : Config
    }
}


interface HomeComponent {
    val model: Value<Model>

    fun onItemClicked(item: String)

    data class Model(
        val items: List<String>,
    )
}

class DefaultHomeComponent(componentContext: ComponentContext) : HomeComponent {

    override val model: Value<HomeComponent.Model> = MutableValue(HomeComponent.Model(items = List(100) { "Item $it" }))
    override fun onItemClicked(item: String) {}
}

interface CartComponent


class DefaultCartComponent(componentContext: ComponentContext) : CartComponent, ComponentContext by componentContext {

    // Omitted code

}

interface ProfileComponent


class DefaultProfileComponent(componentContext: ComponentContext) : ProfileComponent, ComponentContext by componentContext {

    // Omitted code

}