public IEnumerable <AnnualForecast> Calculate(IBounds bounds, ForecastRequestDto request)
{
decimal wideLowerTotal = request.LumpSumInvestment;
decimal wideUpperTotal = request.LumpSumInvestment;
decimal narrowLowerTotal = request.LumpSumInvestment;
decimal narrowUpperTotal = request.LumpSumInvestment;
decimal runningTotal = request.LumpSumInvestment;
decimal monthlyWideLowerRate = GetMonthlyRate(bounds.WideLowerBound);
decimal monthlyWideUpperRate = GetMonthlyRate(bounds.WideUpperBound);
decimal monthlyNarrowLowerRate = GetMonthlyRate(bounds.NarrowLowerBound);
decimal monthlyNarrowUpperRate = GetMonthlyRate(bounds.NarrowUpperBound);
var response = new List <AnnualForecast>()
{
new AnnualForecast(request.LumpSumInvestment)
};
foreach (int year in Enumerable.Range(1, request.InvestmentTermInYears))
{
wideLowerTotal = CalculateAnnualValue(monthlyWideLowerRate, wideLowerTotal, request);
wideUpperTotal = CalculateAnnualValue(monthlyWideUpperRate, wideUpperTotal, request);
narrowLowerTotal = CalculateAnnualValue(monthlyNarrowLowerRate, narrowLowerTotal, request);
narrowUpperTotal = CalculateAnnualValue(monthlyNarrowUpperRate, narrowUpperTotal, request);
runningTotal += request.MonthlyInvestment * 12;
response.Add(new AnnualForecast(year, runningTotal, wideLowerTotal,
narrowLowerTotal, wideUpperTotal, narrowUpperTotal));
}
return(response);
}
public async Task <ForecastResponseDto> Orchestration(ForecastRequestDto request)
{
try
{
IEnumerable <string> validationMessages = _validator.Validate(request);
if (validationMessages != null && validationMessages.Any())
{
return(new ForecastResponseDto(validationMessages));
}
IBounds bounds = _boundsFactory.GetBounds(request.RiskLevel);
IEnumerable <ForecastResponse> annualForecasts = await _forecastCalculator.Calculate(bounds, request);
return(new ForecastResponseDto(annualForecasts));
}
catch (Exception ex)
{
//logging here
throw;
}
}
private decimal CalculateAnnualValue(decimal monthlyRate, decimal runningTotal, ForecastRequestDto request)
{
foreach (int month in Enumerable.Range(1, 12))
{
runningTotal = request.MonthlyInvestment + (runningTotal * monthlyRate);
}
return(Math.Round(runningTotal, 2));
}
