TicketMachine

TicketMachine.kt

class TicketMachine @Inject constructor(
    private val printer: Printer,
    private val display: Display,
    private val coinCounter: CoinCounter,
) {
    private var selectedTicketType: TicketType? = null

    init {
        display.show("Select ticket:")
    }

    fun selectTicket(ticketType: TicketType) {
        selectedTicketType = ticketType
        val missingCoins = coinCounter.getMissingCoins(ticketType)
        display.show("Ticket selected: ${ticketType.name}. Insert coins: $missingCoins")
    }

    fun insertCoin() {
        val selectedTicketType = this.selectedTicketType
        if (selectedTicketType == null) {
            display.show("Returning coin. Select ticket first!")
            return
        }

        coinCounter.insertCoin()
        val missingCoins = coinCounter.getMissingCoins(selectedTicketType)
        when (missingCoins) {
            0 -> {
                printer.printTicket(selectedTicketType)
                reset()
            }
            else -> {
                display.show("Insert coins: $missingCoins")
            }
        }
    }

    fun abort() {
        display.show("Abort. Returning coins: ${coinCounter.getInsertedCoins()}")
        reset()
    }

    private fun reset() {
        selectedTicketType = null
        coinCounter.reset()
        display.show("Select ticket:")
    }
}