using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace BankingInterface
{

    public partial class BankingInterface : Form
    {
        public BankingInterface()
        {
            InitializeComponent();
        }

        private void CreateAccountButton_Click(object sender, EventArgs e)
        {
            string fullName = " ";
            int accountNumber = 0;
            double initialBalance = 0.00;
            Boolean validName = false;
            Boolean validAccount = false;
            Boolean validBalance = false;

            if (string.IsNullOrWhiteSpace(AccountNameInput.Text))
            {
                MessageBox.Show("Please enter your full name.", "Error",
                MessageBoxButtons.OKCancel);
            }
            else if(Regex.IsMatch(AccountNameInput.Text, @"^[a-zA-Z ]+$"))
            {
                if(AccountNameInput.Text.Contains(" "))
                {
                    fullName = AccountNameInput.Text;
                    validName = true;
                }
                else
                {
                    MessageBox.Show("Full name must contain a space.", "Error",
                    MessageBoxButtons.OKCancel);
                }
            }
            else
            {
                MessageBox.Show("Name must not contain numbers or special characters.", "Error",
                MessageBoxButtons.OKCancel);
            }

            if (string.IsNullOrWhiteSpace(AccountNumberInput.Text))
            {
                MessageBox.Show("Please enter your account number", "Error",
                MessageBoxButtons.OKCancel);
            }
            else if(Regex.IsMatch(AccountNumberInput.Text, @"^[0-9]+$"))
            {
                accountNumber = Convert.ToInt32(AccountNumberInput.Text);
                validAccount = true;
            }
            else
            {
                MessageBox.Show("Must contain only numbers.", "Error",
                MessageBoxButtons.OKCancel);
            }

            if (string.IsNullOrWhiteSpace(InitialBalanceInput.Text))
            {
                MessageBox.Show("Please enter your initial balance", "Error",
                MessageBoxButtons.OKCancel);
            }
            else if (Regex.IsMatch(AccountNumberInput.Text, @"^[0-9.]+$"))
            {
                initialBalance = Math.Round(Convert.ToDouble(InitialBalanceInput.Text),2);
                validBalance = true;
            }
            else
            {
                MessageBox.Show("Initial balance must contain only numbers and a decimal point.", "Error",
                MessageBoxButtons.OKCancel);
            }

            if(validName == true && validAccount == true && validBalance == true)
            {
                AccountBalanceDisplay.Text = "$" + Convert.ToString(initialBalance);
                Customer cust1 = new Customer(fullName, accountNumber, initialBalance);
            }
        }

        private void ApplyButton_Click(object sender, EventArgs e)
        {
            double userInput = Convert.ToDouble(AmountInput.Text);

            if (DepositRButton.Checked)
            {
                cust1.Deposit(userInput);
            }
        }

        public class Customer
        {
            private string fullName;
            private int accountNumber;
            private double initialBalance;
            private double userInput;
            private double currentBalance;
            public Customer()
            {

            }

            public Customer(string fN, int aN, double iB)
            {
                fullName = fN;
                accountNumber = aN;
                initialBalance = iB;
            }

            public double Deposit(double uI)
            {
                userInput = uI;
                currentBalance = Math.Round((currentBalance + userInput), 2);
                return currentBalance;
            }

            public double Withdrawal(double uI)
            {
                userInput = uI;
                currentBalance = Math.Round((currentBalance - userInput), 2);
                return currentBalance;
            }

            public override string ToString()
            {
                return "$" + currentBalance;
            }
        }
    }
}