public static QuarterlyConsumptionResult ComputeQuarterlyConsumption
(QuarterlyConsumptionParameters request)
{
var result = new QuarterlyConsumptionResult
{
NewReferenceReading = request.StartMeterReading
};
var startQuarterNumber = request.StartDate.QuarterNumber();
var endQuarterNumber = request.CurrentMessage.Timestamp.QuarterNumber();
for (int q = startQuarterNumber + 1; q <= endQuarterNumber; q++)
{
var quarterDate = DateTimeExtensions.GetQuarterDate(q);
var reading = GetIntermediateReading(request, quarterDate);
result.Quarters.Add(new Tuple <DateTime, decimal>(quarterDate, reading - result.NewReferenceReading));
result.NewReferenceDate = quarterDate;
result.NewReferenceReading = reading;
result.NewReferenceQuarter = q;
}
return(result);
}
private static decimal GetIntermediateReading(QuarterlyConsumptionParameters request, DateTime quarterDate)
{
if (quarterDate == request.CurrentMessage.Timestamp)
{
return(request.CurrentMessage.MeterValue);
}
var totalMilliSeconds = (decimal)(request.CurrentMessage.Timestamp - request.PreviousMessage.Timestamp).TotalMilliseconds;
var quarterMilliSeconds = (decimal)(quarterDate - request.PreviousMessage.Timestamp).TotalMilliseconds;
var totalConsumption = request.CurrentMessage.MeterValue - request.PreviousMessage.MeterValue;
var quarterConsumption = totalConsumption * (quarterMilliSeconds - totalMilliSeconds);
return(request.PreviousMessage.MeterValue + quarterConsumption);
}