#540 Implementation of ATM Cash Withdrawal

/**
 * Interface for interacting with the ATM hardware.
 */
interface Hardware {
    /**
     * Returns an array containing the number of banknotes for denominations
     * 50, 100, 500, 1000, and 5000.
     * The method is slow and creates noise.
     *
     * @return an array where every element corresponds to the number of banknotes
     * of a specific denomination.
     * For example, [10, 20, 30, 40, 50] means:
     * - 10 banknotes of 50 rubles
     * - 20 banknotes of 100 rubles
     * - 30 banknotes of 500 rubles
     * - 40 banknotes of 1000 rubles
     * - 50 banknotes of 5000 rubles
     */
    fun billsCounts(): IntArray

    /**
     * Loads the specified banknotes into the cash-dispensing box.
     *
     * @param billsCounts an array containing the number of banknotes for
     * denominations [50, 100, 500, 1000, 5000].
     * For example, [0, 1, 0, 2, 0] means:
     * - 0 banknotes of 50 rubles
     * - 1 banknote of 100 rubles
     * - 0 banknotes of 500 rubles
     * - 2 banknotes of 1000 rubles
     * - 0 banknotes of 5000 rubles
     */
    fun giveBills(billsCounts: IntArray)
}

/**
 * Class implementing ATM business logic.
 * Write the code here.
 */
class MyATM {
    /**
     * ATM hardware.
     */
    var hardware: Hardware? = null
    val nominals = [50, 100, 500, 1000, 5000]

    fun calcTotal(): Int

    fun giveMoney(req: OperationRequest): OperationResponse

    data class OperationRequest(val sum: Int)

    data class OperationResponse(val status: OperationStatus)
}