suspend fun main() {
    val bot = TelegramBot("BOT_TOKEN")

    bot.handleUpdates()
    // start long-polling listener
}

@CommandHandler(["/start"])
suspend fun start(user: User, bot: TelegramBot) {
    message { "Hello, what's your name?" }.send(user, bot)
    bot.inputListener[user] = "conversation"
}

@InputHandler(["conversation"], guard = UserPresentGuard::class)
suspend fun startConversation(update: ProcessedUpdate, user: User, bot: TelegramBot) {
    message { "Nice to meet you, ${update.text}" }.send(user, bot)
    message { "What is your favorite food?" }.send(user, bot)
    bot.inputListener.set(user) { "conversation-2step" } // another way to set input
}

@CommonHandler.Regex("blue colo?r")
suspend fun color(user: User, bot: TelegramBot) {
    message { "Oh you also like blue color?" }.send(user, bot)
}
//..

fun main() = runBlocking {
    val bot = TelegramBot("BOT_TOKEN")

    bot.handleUpdates { update ->
        onCommand("/start") {
            message { "Hello, what's your name?" }.send(user, bot)
            bot.inputListener[user] = "conversation"
        }
        inputChain("conversation") {
            message { "Nice to meet you, ${message.text}" }.send(update.getUser(), bot)
            message { "What is your favorite food?" }.send(update.getUser(), bot)
        }.breakIf({ message.text == "peanut butter" }) { // chain break condition
            message { "Oh, too bad, I'm allergic to it." }.send(update.getUser(), bot)
            // action that will be applied when match
        }.andThen {
            // next input point if break condition doesn't match
        }
    }
}

message { "test" }.sendAsync(user, bot).onFailure {
    println("code: ${it.errorCode} description: ${it.description}")
}