interface Printer {

    fun print(data: String)

    class Log : Printer  {
        override fun print(data: String) {
            Log.d("TAG","Print some info to log - $data")
        }
    }
    class Firebase(private val firebaseAnalytics: FirebaseAnalytics) : Printer {
        override fun print(data: String) {
            Log.d("TAG","Firebase data print - $data")
        }
    }

    class Empty : Printer {
        override fun print(data: String) = Unit
    }
}

interface Data {

    fun changePrinter(printer: Printer)

    fun print()

    class Base(
        private val data: String
    ) : Data {

        private var printer: Printer = Printer.Empty

        override fun changePrinter(printer: Printer) {
            this.printer = printer
        }

        override fun print() = printer.print(data)


    }
}

fun main() {
    // Using Strategy pattern
    val data = Data.Base("Data from network")
    val logPrinter = Printer.Log()

    data.changePrinter(logPrinter)

    data.printData() // print the following text: Print some info to log - Data from network

    val firebasePrinter = Printer.Firebase(Firebase.getAnalytics())

    data.changePrinter(firebasePrinter)

    data.printData() // print the following text: Firebase data print - Data from network
}