TicketMachineParts

TicketMachineParts.kt

enum class TicketType(val coins: Int) {
    ADULT(2),
    CHILD(1),
}

class Printer(
    private val display: Display,
) {
    fun printTicket(selectedTicketType: TicketType) {
        display.show("Ticket printed: ${selectedTicketType.name}")
    }
}

class Display {
    fun show(text: String) { println("> $text") }
}

class CoinCounter {
    private var insertedCoins = 0

    fun insertCoin() { insertedCoins += 1 }

    fun getMissingCoins(selectedTicketType: TicketType): Int {
        return selectedTicketType.coins - insertedCoins
    }

    fun getInsertedCoins() = insertedCoins

    fun reset() { insertedCoins = 0 }
}