/// <summary>
/// Gets the associated Rate and calculates the monthly estimates for the specified Meter details
/// </summary>
/// <param name="meterCategory">Meter Category of the Meter</param>
/// <param name="meterSubCategory">Meter SubCategory of the Meter</param>
/// <param name="meterName">Meter Name of the Meter</param>
/// <param name="region">Azure Location as per Pricing Specs</param>
/// <param name="quantity">Quantity of the resource usage in a month</param>
/// <param name="rate">Rate will be set based on the associated meter in CSP Rate Card</param>
/// <param name="log">The object that will contain the exception messages</param>
/// <param name="nameOfResource">Name of the Azure resource</param>
/// <returns> Returns the Monthly Cost for the resource</returns>
private static double GetResourceRate(string meterCategory, string meterSubCategory, string meterName, string region, double quantity, out double rate, ref StringBuilder log, string nameOfResource)
{
double totalCost = 0;
rate = 0;
try
{
// If any meter fields are missing throw an exception
if (meterCategory == null)
{
throw new Exception(ExceptionLogger.GenerateLoggerTextForMeterRateFetchFailed("MeterCategory is null", nameOfResource));
}
if (meterSubCategory == null)
{
throw new Exception(ExceptionLogger.GenerateLoggerTextForMeterRateFetchFailed("MeterSubCategory is null", nameOfResource));
}
if (meterName == null)
{
throw new Exception(ExceptionLogger.GenerateLoggerTextForMeterRateFetchFailed("MeterName is null", nameOfResource));
}
if (region == null)
{
throw new Exception(ExceptionLogger.GenerateLoggerTextForMeterRateFetchFailed("Region is null", nameOfResource));
}
// Fetch the rate for the resource component by matching the meter fields provided
Meter ratesForComponent = meterList.Find(x => meterCategory.Equals(x.MeterCategory, StringComparison.OrdinalIgnoreCase) &&
meterSubCategory.Equals(x.MeterSubCategory, StringComparison.OrdinalIgnoreCase) &&
meterName.Equals(x.MeterName, StringComparison.OrdinalIgnoreCase) &&
region.Equals(x.MeterRegion, StringComparison.OrdinalIgnoreCase));
// If the Meter is missing in CSP Rate Card, check if there is a global rate (Rate without region specified)
if (ratesForComponent == null)
{
ratesForComponent = meterList.Find(x => meterCategory.Equals(x.MeterCategory, StringComparison.OrdinalIgnoreCase) &&
meterSubCategory.Equals(x.MeterSubCategory, StringComparison.OrdinalIgnoreCase) &&
meterName.Equals(x.MeterName, StringComparison.OrdinalIgnoreCase) &&
x.MeterRegion.Equals(string.Empty, StringComparison.OrdinalIgnoreCase));
}
// Check if Meter found
if (ratesForComponent != null)
{
// Fetch the Rates from the meter found
OrderedDictionary meterRates = ratesForComponent.MeterRates;
// If consumed quantity if less that included quantity, set rate and cost to zero
if (quantity <= ratesForComponent.IncludedQuantity)
{
totalCost = 0;
rate = 0;
}
else if (meterRates.Count == 1)
{
// If linear rating, Calculate Monthly Cost as quantity x rate
rate = (double)meterRates[0];
totalCost = (quantity - ratesForComponent.IncludedQuantity) * rate;
}
else
{
// If tiered rating, calculate Monthly Cost based on tiered pricing
double quantitytobeRated = quantity - ratesForComponent.IncludedQuantity;
totalCost = 0;
for (int i = 1; i < meterRates.Count; i++)
{
string currentKeyString = (string)meterRates.Cast <DictionaryEntry>().ElementAt(i).Key;
string previousKeyString = (string)meterRates.Cast <DictionaryEntry>().ElementAt(i - 1).Key;
double currentKey = double.Parse(currentKeyString);
double previousKey = double.Parse(previousKeyString);
if (quantitytobeRated <= currentKey)
{
totalCost = totalCost + ((quantitytobeRated - previousKey) * (double)meterRates[i - 1]);
rate = (double)meterRates[i - 1];
break;
}
else
{
totalCost = totalCost + ((currentKey - previousKey) * (double)meterRates[i - 1]);
if (i == meterRates.Count - 1)
{
totalCost = totalCost + ((quantitytobeRated - currentKey) * (double)meterRates[i]);
rate = (double)meterRates[i];
}
}
}
}
}
else
{
// Meter for specified parameters not found, Throw an exception
throw new Exception(ExceptionLogger.GenerateLoggerTextForMeterRateFetchFailed(string.Format("Meter not found in Rate Card. MeterCategory:{0},MeterSubCategory:{1},MeterName:{2},Region:{3} ", meterCategory, meterSubCategory, meterName, region), nameOfResource));
}
}
catch (Exception ex)
{
totalCost = 0;
log.AppendLine(ex.Message);
}
return(totalCost);
}