public ShoppingCart(Guid sessionId, string userName, Currency currency, TaxRate taxRate, ChargeRate chargeRate)
{
this.Id = Guid.NewGuid();
this.SessionId = sessionId;
this.UserName = userName;
this.Items = new List<Item>();
this.ItemsRemoved = new List<ItemRemoved>();
this.Date = DateTime.Now;
this.Currency = currency;
this.TransactionNumber = string.Empty;
this.Note = string.Empty;
this.Payment = new Payment(PaymentTypes.Cash, 0d, 0d);
var chargeAmount = chargeRate.Apply(0d);
var taxAmount = taxRate.Apply(0d);
var discountAmount = DiscountRate.None.Apply(0d, 0);
this.Summary = new Summary(taxAmount, discountAmount, chargeAmount, 0d);
}
private void CalculateCharge()
{
if (Summary.ChargeAmount.Percent > 0)
{
var chargeRate = new ChargeRate(ChargeType.Percent, Summary.ChargeAmount.Percent);
var chargeAmount = chargeRate.Apply(Summary.SubTotal - Summary.DiscountTotalAmount);
this.Summary = new Summary(Summary.TaxAmount, Summary.DiscountTotalAmount, chargeAmount, Summary.SubTotal);
}
}
public void ChangeCharge(ChargeRate chargeRate)
{
var chargeAmount = chargeRate.Apply(Summary.SubTotal);
this.Summary = new Summary(Summary.TaxAmount, Summary.DiscountTotalAmount, chargeAmount, Summary.SubTotal);
CalculateCharge();
CalculateTax();
}