using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

/* REMEMBER FORMATTING CHECK*/
/* REMEMBER FORMATTING CHECK*/
/* REMEMBER FORMATTING CHECK*/
/* REMEMBER FORMATTING CHECK*/
/* REMEMBER FORMATTING CHECK*/
/* REMEMBER FORMATTING CHECK*/
/* REMEMBER FORMATTING CHECK*/
/* REMEMBER FORMATTING CHECK*/

namespace Assessment_1__ATM
{
    class ATM
    {
        const int CHECK_BALANCE = 1;
        const int WITHDRAWAL = 2;
        const int TRANSFER = 3;
        const int SAVINGS_ACCOUNT = 1;
        const int DEBIT_CARD = 2;
        const int CREDIT_CARD = 3;
        const int LINE_OF_CREDIT = 4;
        const int EXIT = 0;
        const int HIGHEST_INCREMENT = 50;
        const int LOWEST_INCREMENT = 20;
        const double FEE = 0.1;

        static double savingsBalance = 901.45;
        static double debitCardBalance = 450;
        static double creditCardBalance = 1500;
        static double lineOfCreditBalance = 2000;

        static void DisplayMainMenu()
        {
            {
                string menu = "\nWelcome to EziTeller ATM Machine"
                            + "\n\n\tTransaction Menu"
                            + "\n\t================"
                            + "\n\t1. Check Balance"
                            + "\n\n\t2. Withdrawal"
                            + "\n\n\t3. Transfer"
                            + "\n\n\n\n\nPlease enter your choice 1 ... 3 or 0 to Exit:";

                Console.Write(menu);
            }
        }

        static void DisplaySubMenu()
        {
            {
                string menu = "\n\n\t1. Savings Account"
                            + "\n\n\t2. Debit Card"
                            + "\n\n\t3. Credit Card"
                            + "\n\n\t4. Line of Credit"
                            + "\n\n\n\nPlease enter your choice 1 ... 4 or 0 to Exit:";

                Console.Write(menu);
            }
        }


        static int ReadOption(Boolean mainmenu)
        {
            int lowestValue = 0;
            int highestValue = 0;
            int option = 0;
            bool validMenuOption = false;

            if (mainmenu == true)
            {
                lowestValue = CHECK_BALANCE;
                highestValue = TRANSFER;
            }
            else
            {
                lowestValue = SAVINGS_ACCOUNT;
                highestValue = LINE_OF_CREDIT;
            }

            do
            {
                option = int.Parse(Console.ReadLine());
                if ((EXIT <= option) && (option <= highestValue))
                {
                    validMenuOption = true;
                }
                else {
                    Console.WriteLine("\n\tOption must be {0} ... {1} or {2} to Exit.",
                                    lowestValue, highestValue, EXIT);
                    DisplayMainMenu();
                }

            }
            while (!validMenuOption);
            return option;
        }

        static string SetAccountName(int whichAccount)
        {
            if (whichAccount == SAVINGS_ACCOUNT) {
                return "Savings Account";
            }
            if (whichAccount == DEBIT_CARD) {
                return "Debit Card";
            }
            if (whichAccount == CREDIT_CARD) {
                return "Credit Card";
            }
            else {
                return "Line of Credit";
            }
        }

        static double SetBalance(int whichAccount)
        {
            if (whichAccount == SAVINGS_ACCOUNT) {
                return savingsBalance;
            }
            if (whichAccount == DEBIT_CARD) {
                return debitCardBalance;
            }
            if (whichAccount == CREDIT_CARD) {
                return creditCardBalance;
            }
            else {
                return lineOfCreditBalance;
            }
        }

        static bool SetFee(int whichAccount)
        {
            if (whichAccount == CREDIT_CARD || whichAccount == DEBIT_CARD) {
                return true;
            }
            else
            {
                return false;
            }
        }

        static void DisplayBalance(int whichAccount)
        {
            string accountName = "";
            double balance = 0;
            DateTime date = DateTime.Now;
            Console.WriteLine("\nCurrent Date: {0} ", date);
            accountName = SetAccountName(whichAccount);
            balance = SetBalance(whichAccount);
            Console.WriteLine("\nBalance of {0} is ${1}.", accountName, balance);

        }

        static int IncrementalCheck() {
            int amount = 0;
            while (true) {
                Console.WriteLine("Please enter amount:");
                amount = int.Parse(Console.ReadLine());
                if (amount % HIGHEST_INCREMENT != 0 && amount % 20 != 0) {
                    Console.WriteLine("Sorry, we cannot dispense {0}.", amount);

                }
                else {
                    return amount;
                }
            }
        }

        static void DispenseCash(int amount) {
            int withdrawalAmount = amount;
            int highestIncrementNotes = 0;
            int lowestIncrementNotes = 0;
            if ((amount % LOWEST_INCREMENT == 0) && amount % LOWEST_INCREMENT != 0) {
                while (amount >= LOWEST_INCREMENT) {
                      lowestIncrementNotes += 1;
                    amount = amount - LOWEST_INCREMENT;
                }
            }
            if (amount % HIGHEST_INCREMENT == 0) {
                while (amount >= HIGHEST_INCREMENT) {
                    highestIncrementNotes += 1;
                    amount = amount - HIGHEST_INCREMENT;
                }
            }
            else {
                while ((amount >= HIGHEST_INCREMENT) && (amount % HIGHEST_INCREMENT != 0)) {
                    amount = amount - HIGHEST_INCREMENT;
                    highestIncrementNotes += 1;
                }
                if (amount % LOWEST_INCREMENT == 0) {
                    while (amount >= LOWEST_INCREMENT) {
                        amount = amount - LOWEST_INCREMENT;
                        lowestIncrementNotes += 1;
                    }
                }
            }
            Console.WriteLine("\nPlease collect ${0} consisting of:", withdrawalAmount);
            Console.WriteLine("\n\n\t{0} x ${1} notes", highestIncrementNotes, HIGHEST_INCREMENT);
            Console.WriteLine("\t\tand");
            Console.WriteLine("\n\n\t{0} x ${1} notes", lowestIncrementNotes, LOWEST_INCREMENT);
        }


        static void TransferAmount(int fromAccount, int toAccount) {
        }

        static void WithrawAmount(int whichAccount)
        {
                int withdrawalAmount = IncrementalCheck();
                double balance = SetBalance(whichAccount);
                if (SetFee(whichAccount) == false) {
                    if (balance < withdrawalAmount) {
                        Console.WriteLine("\nYou have insufficient funds.");
                    }
                    else {
                        if (whichAccount == SAVINGS_ACCOUNT) {
                            savingsBalance = savingsBalance - withdrawalAmount;
                        }
                        if (whichAccount == LINE_OF_CREDIT) {
                            lineOfCreditBalance = lineOfCreditBalance - withdrawalAmount;
                        }
                        DispenseCash(withdrawalAmount);
                        DisplayBalance(whichAccount);
                    }
                }
                else {
                    if (balance < (withdrawalAmount + FEE)) {
                        Console.WriteLine("\nYou have insufficient funds.");
                    }
                    else {
                        if (whichAccount == CREDIT_CARD) {
                            creditCardBalance = creditCardBalance - withdrawalAmount;
                        }
                        if (whichAccount == DEBIT_CARD) {
                            debitCardBalance = debitCardBalance - withdrawalAmount;
                        }
                        DispenseCash(withdrawalAmount);
                        DisplayBalance(whichAccount);
                    }

            }
        }


        static void Main()
        {

            int transactionOption;
            int accountOption;
            while (true)
            {
                DisplayMainMenu();
                transactionOption = ReadOption(true);
                DisplaySubMenu();
                accountOption = ReadOption(false);
                if (transactionOption == CHECK_BALANCE)
                {
                    DisplayBalance(accountOption);
                }
                if (transactionOption == WITHDRAWAL)
                {
                    WithrawAmount(accountOption);
                }
                if (transactionOption == TRANSFER) {
                    ReadOption(false);
                    Console.WriteLine("Transfer from which account?");
                    TransferAmount();
                }
           }
        }
    }
}