// Inner Class > collect the credit card details from the user
// Outer Class > Credit Card Processor
// Tuple Class > Securely pass the credit card information thru api
// Enumerator > page 47 enum OrderStatus response from api
// Scanner Class > user inputs

import java.util.Scanner;

public class OrderProcessor {

    // variables
    private String customerName;

    // constructor statement
    public OrderProcessor(String customerName) { // function
        this.customerName = customerName;  // structural
    } // OrderProcessor()

    // function to process the customers credit card
    // base return types > void any boolean others ...
    public void processOrder() {
        // CreditCardInfo Class
        CreditCardInfo creditCardInfo = new CreditCardInfo();
        creditCardInfo.inputCreditCardDetails();

        // Tuple Class with the User Inputs
        Tuple<OrderStatus, Double> result = processOrderWithPayment(creditCardInfo);

        // Response Code from the API
        System.out.println("Payment Status: " + result.getFirst());
        System.out.println(("Amount Approved: " + result.getSecond()));  // getter calls the variable

    } // processOrder

    // Tuple immutable tuple private function
    private Tuple<OrderStatus, Double> processOrderWithPayment(
            // Credit Card Info parameter
            CreditCardInfo creditCardInfo
    ) {
        // API response
        return new Tuple<>(OrderStatus.SUCCESS, 100.00);
    } // Tuple response


    // Credit Card Class
    // inner class of OrderProcess Class
    // User inputting their credit card information
    private class CreditCardInfo {
        // variables private to CreditCardInfo Class
        private String cardNumber;
        private String expirationDate;
        private String cvv;

        // Get the inputs for the credit card
        // define a function to call in the application
        public void inputCreditCardDetails() {
            Scanner scanner = new Scanner(System.in);

            System.out.println("Enter Credit Card Number: ");
            this.cardNumber = scanner.nextLine();
            System.out.println("Enter Expiration Date (MM/YY): ");
            this.expirationDate = scanner.nextLine();
            System.out.println("Enter CVV Code: ");
            this.cvv = scanner.nextLine();

            scanner.close();

        } // inputCreditCardDetails

        // getters get the return of the variables in memory
        public String getCardNumber() {
            return cardNumber;
        } // getCardNumber

        public String getExpirationDate() {
            return expirationDate;
        } // expdate

        public String getCvv() {
            return cvv;
        } // cvv

    } // CreditCardInfo Inner Class

    // Tuple Structure using an Inner Class
    // T1 OrderStatus
    // T2 Double
    private class Tuple<T1, T2> {
        private T1 first;
        private T2 second;

        public Tuple(T1 first, T2 second) {
            this.first = first;
            this.second = second;
        } // constructor

        // getters
        public T1 getFirst() {
            return first;
        }

        public T2 getSecond() {
            return second;
        }

    } // Tuple Inner Class


    // Enumeration for order status
    private enum OrderStatus {
        SUCCESS,   // UPPERCASE PROVIDERS API RESPONSE
        FAILURE
    } // OrderStatus


    // main() Runtime
    public static void main(String[] args) {

        try {

            Scanner scanner = new Scanner(System.in);

            System.out.println("Enter Customer Name on Credit Card: ");
            String customerName = scanner.nextLine();

            OrderProcessor orderProcessor = new OrderProcessor(customerName);

            orderProcessor.processOrder(); // call processOrder()

        } // try

        catch (Exception err) {
            System.out.println("Error occurred: " + err);
        } // catch

        finally {
            System.out.println("Thank you for your order!");
        } // finally

    } // main()

} // OrderProcessor Class