import java.util.*;
public class Main {

    public static void main(String[] args) {
        int k =0;
        Scanner keyboard = new Scanner(System.in);
        System.out.println("Ye Olde Keychain Shoppe");
        System.out.println();
        int choice = 0;
        int price = 10;
        double tax = 0.0825;
        int ship = 5;
        int pership = 1;
        while(choice !=4){
            System.out.println("1. Add Keychains to Order");
            System.out.println("2. Remove Keychains from Order");
            System.out.println("3. View Current Order");
            System.out.println("4. Checkout");
            System.out.println();
            System.out.print("Please enter your choice: ");
            choice = keyboard.nextInt();

            if(choice == 1){
                k=add_keychains(k);
                System.out.println();
            }else if(choice ==2){
                k = remove_keychains(k);
                System.out.println();
            }else if(choice==3){
                view_order(k,tax,ship,pership,price);
                System.out.println();
            }else if(choice==4){
                Scanner s = new Scanner(System.in);
                System.out.println();
                System.out.println("CHECKOUT");
                System.out.println();
                System.out.print("What is your name? ");
                String name = s.next();
                view_order(k,tax,ship,pership,price);
                System.out.print("Thanks for your order, "+name);
                System.out.println();
            }
        }

    }
    public static int add_keychains(int k){
        Scanner s = new Scanner(System.in);
        System.out.print("You have "+k+" keychains. How many to add? ");
        int add = s.nextInt();
        k = k+add;
        System.out.println("You now have "+k+" keychains.");
        return k;
    }
    public static int remove_keychains(int k){
        Scanner s = new Scanner(System.in);
        System.out.print("You now have "+k+" keychains. How many to remove? ");
        int remove = s.nextInt();
        int remain = k - remove;
        System.out.println("You now have "+remain+" keychains.");
        return remain;
    }public static void view_order(int k, double tax, int ship, int pership, double price ){
        System.out.println("You now have "+k+" keychains.");
        System.out.println("Keychains cost $10 each.");
        System.out.println("The shipping charges on the order "+ship);
        price = k*10.00;
        System.out.println("The subtotal before tax "+price+".");
        System.out.println("The tax on the order "+tax);
        double total= price+tax*price+pership+ship;
        System.out.println("The final cost of the order is "+total);
    }
}