public decimal CalculatePriceInCurrency(decimal price, string fromCurrency, string toCurrency)
{
if (price == 0)
{
return(0);
}
if (price < 0)
{
throw new ArgumentException("Invalid price");
}
if (fromCurrency == toCurrency)
{
return(price);
}
var currencyValidator = new CurrencyValidator();
if (!currencyValidator.IsValidCurrency(fromCurrency) || !currencyValidator.IsValidCurrency(toCurrency))
{
throw new ArgumentException("Invalid currency.");
}
var rate = rates.FirstOrDefault(r => r.From == fromCurrency && r.To == toCurrency);
if (rate == null)
{
throw new InvalidOperationException($"Rate conversion not possible from {fromCurrency} to {toCurrency}.");
}
return(price * rate.RateValue);
}
public decimal CalculateOrderTotalPrice(Guid orderNumber, List <OrderItem> items, Client client, string OutputCurrencyCode)
{
if (items == null)
{
return(0);
}
if (items.Count == 0)
{
return(0);
}
var currencyValidator = new CurrencyValidator();
if (!currencyValidator.IsValidCurrency(OutputCurrencyCode))
{
throw new ArgumentException("Invalid currency.");
}
decimal totalPrice = 0;
// Calculate the total price of order
foreach (var item in items)
{
totalPrice += item.Price;
}
// Apply discount for premium members
if (client.IsPremiumMebmer == true)
{
var exchangeRateCalculator = new ExchangeRateCalculator();
var orderCurrency = items[0].CurrencyCode;
var totalPriceInPln = exchangeRateCalculator.CalculatePriceInCurrency(totalPrice, orderCurrency, OutputCurrencyCode);
// Check if discount should be applied
if (totalPriceInPln > 1500)
{
Debug.WriteLine($"Applying premium member discount. Order {orderNumber}, Client {client.ClientId}");
totalPrice = totalPrice * 0.95m; // discount 5%
}
}
// additional discount for birthday
if (DateTime.Now.Date == client.BirthDate.Date)
{
Debug.WriteLine($"Applying member birthday discount. Order {orderNumber}, Client {client.ClientId}");
totalPrice = totalPrice * 0.98m; // discount 2%
}
return(totalPrice);
}
