using System;

​

    using System.Collections.Generic;

    using System.Text;

namespace ConsoleApp8

{

​

    public class Subway

    {

        private static Dictionary<string, decimal> cateringMenu = new Dictionary<string, decimal>()

    {

        {"Subway sandwich", 39.99M},

        {"Cookie Platter", 19.99M},

        {"Coke", 39.99M},

        {"Salad", 19.99M}

    };

​

​

        public static void processCustomer()

        {

            var order = takeCateringOrder();

            var Total = calculateTotal(order);

​

            Console.WriteLine("TotaL\n", Total);

            decimal payment = getPaymentFromCustomer(Total);

            processPayment(Total, payment);

            printReceipt(order, payment);

            Console.WriteLine("Thank you for shopping at Subway!");

​

        }

​

        public static void printCateringMenu()

        {

            Console.WriteLine("Catering Menu:");

            foreach (var product in cateringMenu)

            {

                Console.WriteLine("{0}: ${1:0.00}", product.Key, product.Value);

            }

            Console.WriteLine();

        }

​

        public static Dictionary<string, int> takeCateringOrder()

        {

            printCateringMenu();

​

            Dictionary<string, int> order = new Dictionary<string, int>();

            foreach (var product in cateringMenu)

            {

                string input;

                int quantity;

                bool isValidQuantity;

                bool proceedToNextItem = false;

​

                while (!proceedToNextItem)

                {

                    Console.WriteLine("Purchase how many of {0} for {1:0.00} each?", product.Key, product.Value);

                    input = Console.ReadLine();

                    isValidQuantity = int.TryParse(input, out quantity);

                    if (!isValidQuantity)

                    {

                        Console.WriteLine("Invalid number input.");

                    }

                    else if (isValidQuantity && quantity == 0)

                    {

                        //don't add item

                        proceedToNextItem = true;

                    }

                    else

                    {

                        order.Add(product.Key, quantity);

                        proceedToNextItem = true;

                    }

                }

            }

            return order;

        }

​

        public static decimal calculateTotal(Dictionary<string, int> order)

        {

            decimal Total = 0M;

            int itemQty = 0;

            foreach (var item in order)

            {

                itemQty = item.Value;

                decimal costOfItems = itemQty * cateringMenu[item.Key];

                Total += costOfItems;

            }

            return Total;

        }

​

​

​

        public static decimal getPaymentFromCustomer(decimal total)

        {

            decimal payment = 0M;

            bool isValidPayment = false;

            while (!isValidPayment)

            {

                Console.WriteLine("Your total due is ${0:0.00}.", total);

                var input = Console.ReadLine();

                isValidPayment = decimal.TryParse(input, out payment);

                if (!isValidPayment)

                {

                    Console.WriteLine("Invalid payment amount. Please try again.");

                }

                else

                {

                    isValidPayment = true;

                }

            }

            return payment;

        }

​

        public static decimal processPayment(decimal total, decimal payment)

        {

            bool isPaymentEnough = false;

            decimal change = 0;

            while (!isPaymentEnough)

            {

                if (payment == total)

                {

                    isPaymentEnough = true;

                }

                else if (payment < total)

                {

                    Console.WriteLine

                    (

                        "Payment ${0:0.00} is not enough for total ${1:0.00}"

                        , payment,

                        total

                    );

                    payment = getPaymentFromCustomer(total);

                }

                else

                {

                    isPaymentEnough = true;

                    change = payment + -total;

                    Console.WriteLine("Your change is ${0:0.00}.", change);

                }

            }

            return change;

        }

​

        public static void printReceipt(Dictionary<string, int> order, decimal payment)

        {

            StringBuilder receipt = new StringBuilder("");

            Console.WriteLine("Receipt");

            foreach (var item in order)

            {

                Console.WriteLine

                (

                    "{0} {1} ${2} ea. ${3}",

                    item.Value,

                    item.Key,

                    cateringMenu[item.Key],

                    item.Value * cateringMenu[item.Key]

                );

            }

​

            var total = calculateTotal(order);

            Console.WriteLine("Total: ${0:0.00}", total);

            Console.WriteLine("Payment: ${0:0.00}", payment);

            decimal change = processPayment(total, payment);

        }

    }

​

    public class Program

    {

        public static void Main()

        {

            string val;

            int choice = 0;

            Console.WriteLine("Enter your Employee type 1 for accountant , 2 for delivery person , 3 for servant");

            val = Console.ReadLine();

            choice = Convert.ToInt32(val);

            switch (choice)

            {

                case 1:

                    new Subway();

                    Subway.processCustomer();

                    break;

                case 2:

                    Console.WriteLine("Please deliver the food once ready");

                    break;

                case 3:

                    Console.WriteLine("Please clean after customer leaves");

                    break;

                default:

                    Console.WriteLine("Invalid input");

                    break;

            }

        }

​

​

​

    }

}

​