// Пример использования суммаризации текста на основе GenAI API
val articleToSummarize = "Long text..."

val summarizerOptions = SummarizerOptions.builder(context)
    .setInputType(InputType.ARTICLE)
    .setOutputType(OutputType.ONE_BULLET)
    .setLanguage(Language.ENGLISH)
    .build()
val summarizer = Summarization.getClient(summarizerOptions)

suspend fun prepareAndStartSummarization(context: Context) {
    val featureStatus = summarizer.checkFeatureStatus().await()

    if (featureStatus == FeatureStatus.DOWNLOADABLE) {
        summarizer.downloadFeature(object : DownloadCallback {

            override fun onDownloadCompleted() {
                startSummarizationRequest(articleToSummarize, summarizer)
            }
        })    
    } else if (featureStatus == FeatureStatus.DOWNLOADING) {
        startSummarizationRequest(articleToSummarize, summarizer)
    } else if (featureStatus == FeatureStatus.AVAILABLE) {
        startSummarizationRequest(articleToSummarize, summarizer)
    } 
}

fun startSummarizationRequest(text: String, summarizer: Summarizer) {
    val summarizationRequest = SummarizationRequest.builder(text).build()

    summarizer.runInference(summarizationRequest) { newText -> 
        // Show new text in UI
    }
}

summarizer.close()

interface NavigationEventDispatcherOwner {

    val navigationEventDispatcher: NavigationEventDispatcher
}

class NavigationEventDispatcher(
    private val fallbackOnBackPressed: (() -> Unit)?,
    private val onHasEnabledCallbacksChanged: ((Boolean) -> Unit)?,
)
    // Добавления callback чтобы слушать когда произйдет нажатие "Назад"
    fun addCallback(
        callback: NavigationEventCallback,
        priority: NavigationEventPriority = NavigationEventPriority.Default
    )

    fun dispatchOnStarted(event: NavigationEvent)

    fun dispatchOnProgressed(event: NavigationEvent)

    fun dispatchOnCompleted()

    fun dispatchOnCancelled()
}

class MyActivity : ComponentActivity() {
    
    init {
        navigationEventDispatcher.addCallback(
            callback = object : NavigationEventCallback(
                isEnabled = true,
                priority = NavigationEventPriority.Default
            ) {
                override fun onEventCompleted() {
                    // Back сделан
                }
            },
            priority = NavigationEventPriority.Default
        )
    }
}