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

namespace MyCo.MyProject.BusinessLayer
{
    // abstract Payment class with generic members
    public abstract class Payment : EntityBase
    {
        protected Payment() { }

        public Payment(decimal amount, DateTime transactionDate)
        {
            Amount = amount;
            TransactionDate = transactionDate;
        }

        public virtual decimal Amount { get; set; }
        public virtual DateTime TransactionDate { get; set; }
    }

    // credit card payment with credit card specific members
    public class CCPayment : Payment
    {
        protected CCPayment() { }

        public CCPayment(Decimal amount, DateTime transactionDate, string ccNumber, string ccExpiryDate)
            : base(amount, transactionDate)
        {
            CCNumber = ccNumber;
            CCExpiryDate = ccExpiryDate;
        }

        public virtual string CCNumber { get; set; }
        public virtual string CCExpiryDate { get; set; }
    }

    // bank transfer with bank transfer specific members
    public class BankTransfer : Payment
    {
        protected BankTransfer() { }

        public BankTransfer(Decimal amount, DateTime transactionDate, string bankName, string accountNo, string bankCode)
            : base(amount, transactionDate)
        {
            BankName = bankName;
            AccountNo = accountNo;
            BankCode = bankCode;
        }

        public virtual string BankName { get; set; }
        public virtual string AccountNo { get; set; }
        public virtual string BankCode { get; set; }
    }

    // collection of various payments
    public class Payments
    {
        private IList<Payment> _Payments = new List<Payment>();

        public Payments() { }

        public void AddPayment(Payment payment)
        {
            _Payments.Add(payment);
        }

        public IList<Payment> PaymentList
        {
            get
            {
                return _Payments.ToList<Payment>().AsReadOnly();
            }
        }
    }

    [TestFixture]
    public class PaymentTest
    {
        [Test]
        public void Can_Create_Various_Payments()
        {
            // create various payments
            CCPayment ccPayment = new CCPayment(99.99m, DateTime.Now, "1111111111111111", "09/09");
            BankTransfer bankTranser = new BankTransfer(10.95m, DateTime.Now, "My Bank", "1000", "100");

            // add to a collection
            Payments payments = new Payments();
            payments.AddPayment(ccPayment);
            payments.AddPayment(bankTranser);

            // loop through and determin at runtim
            foreach (Payment payment in payments.PaymentList)
            {
                switch (payment.GetType().Name)
                {
                    case "CCPayment":
                        Console.Write("This is a cc payment");   
                        break;
                    case "BankTransfer":
                        Console.Write("This is a bank transfer");
                        break;
                }
            }
        }
    }
}