public CalculateResponse Calculate(CalculateRequest request)
{
JavaScriptSerializer serializer = new JavaScriptSerializer();
LogEntry requestLogEntry = new LogEntry();
requestLogEntry.Category = LogCategory.Information;
requestLogEntry.Message = serializer.Serialize(request);
logUtility.Write(requestLogEntry);
CalculateResponse response = new CalculateResponse();
// Verifica se o request recebido é valido.
if (request.IsValid == false)
{
response.ErrorReportCollection = request.ErrorReportCollection;
return(response);
}
// Armazena o troco a ser retornado.
ulong changeAmount = request.PaidAmount - request.ProductAmount;
// Armazena o troco ainda não processado.
ulong remainingAmount = changeAmount;
List <ChangeData> changeDataCollection = new List <ChangeData>();
while (remainingAmount > 0)
{
// Selecionar o processador adequado para o troco restante.
IProcessor processor = ProcessorFactory.Create(remainingAmount);
// Verifica se foi encontrado um processador para realizar o cálculo.
if (processor == null)
{
ErrorReport errorReport = new ErrorReport();
errorReport.FieldName = "ChangeAmount";
errorReport.Message = "Unable to calculate the change amount.";
response.ErrorReportCollection.Add(errorReport);
break;
}
// Calcula o troco para o valor especificado.
List <KeyValuePair <uint, ulong> > changeCollection = processor.Calculate(remainingAmount);
ChangeData changeData = new ChangeData();
changeData.MoneyDescription = processor.GetName();
changeData.ChangeCollection = changeCollection;
changeDataCollection.Add(changeData);
ProcessorCompletedEventArgs eventArgs = new ProcessorCompletedEventArgs();
eventArgs.CurrentChange = changeData;
// Caso exista alguém escutando o evento, dispara a notificação.
if (this.OnProcessorCompleted != null)
{
this.OnProcessorCompleted(this, eventArgs);
}
IEnumerable <ulong> processedAmountCollection = changeCollection.Select(p => p.Key * p.Value);
ulong processedAmount = 0;
foreach (ulong amount in processedAmountCollection)
{
processedAmount += amount;
}
remainingAmount -= processedAmount;
}
// Caso nenhum erro tenha sido encontrado, define success como true e informa o troco
if (response.ErrorReportCollection.Any() == false)
{
response.Success = true;
response.Change = changeDataCollection;
}
LogEntry responseLogEntry = new LogEntry();
responseLogEntry.Category = LogCategory.Information;
responseLogEntry.Message = serializer.Serialize(response);
logUtility.Write(responseLogEntry);
return(response);
}
