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class Event(
    val name: String,
    val params: MutableMap<String, Any>? = null
)

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interface EventsStreamProvider {
    val eventStream: PublishSubject<Event>
}

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class Analytics: EventsStreamProvider {

    override var eventStream = PublishSubject.create<Event>()

    fun trackEvent(e: Event) {
        eventStream.onNext(e)
    }
}

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class FirebaseEvent(
  val name: String, 
  val params: Bundle? = null
)

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class FirebaseMapper: Mapper<Event, FirebaseEvent> {

    override fun mapFrom(e: Event): FirebaseEvent {
        val firebaseEvent = FirebaseEvent(e.name)

        e.params?.let {
            val bundle = Bundle()

            for (param in it) {
                bundle.putString(param.key, param.value as String)

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interface Mapper<in E, out C> {
    fun mapFrom(event: E): C
}

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class FirebaseTracker @Inject constructor(
    private val context: Context,
    private val eventsStreamProvider: EventsStreamProvider,
    private val mapper: FirebaseMapper
) {

    private val compositeDisposable = CompositeDisposable()

    init {
        subscribeToEvents()

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class FirstPageEvents {
    companion object {
        private const val FIRST_PAGE_BUTTON_A = "first_page_button_a"
        private const val FIRST_PAGE_BUTTON_B = "first_page_button_b"

        fun onFirstButtonClicked() = Event(FIRST_PAGE_BUTTON_A)

        fun onSecondButtonClicked() = Event(FIRST_PAGE_BUTTON_B)
    }
}

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class FirstPageActivity : AppCompatActivity() {

    @Inject
    lateinit var analytics: Analytics

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

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class FirstPageActivity : AppCompatActivity() {

    @Inject
    lateinit var analytics: Analytics

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        (applicationContext.applicationContext as App)