/// <summary>
/// Starts up the Carpark Rate Engine Library, loads the rates and gets the calculated rate to charge the customer for the given carpark session
/// </summary>
/// <param name="oInput"></param>
/// <returns></returns>
private string GetCalculatedRate(CPRateRQ oInput, Rates oRateCard)
{
// Create a return object
CPRateRS oRate = new CPRateRS();
try
{
// Create and instance of the Rate Engine and load the Rate table
var cpEngine = new CarparkRE_Lib.RateEngine();
if (cpEngine.LoadRates(oRateCard) >= 0)
{
// Get the Rate and Total Amount to charge the customer
oRate = cpEngine.CalculateParkingCharge(oInput);
}
else
{
// Add a custom message if the rates failed to load
oRate.ErrorHResult = -1;
oRate.ErrorMsg = "Failed to load rates.";
}
}
catch (Exception e)
{
// Record any errors in the return object
oRate = new CPRateRS()
{
ErrorHResult = e.HResult,
ErrorMsg = e.ToString()
};
}
// Return as a Json string
return(JsonConvert.SerializeObject(oRate));
}
/// <summary>
/// Determines the Rate and Amount to charge the customer for Parking
/// </summary>
/// <param name="oRequest">Is an Object from the CarparkRE Library that contains the EntryDateTime and ExitDateTime of the customers parking session</param>
/// <returns></returns>
public CPRateRS CalculateParkingCharge(CPRateRQ oRequest)
{
CPRateRS oRet = new CPRateRS();
try
{
// Make sure we have some rates loaded
if (_mRates.RateCount() == 0)
{
return(oRet);
}
// Begin with the Standard Rate as the parking charge by default
oRet.RateName = _mRates.StandardRates.Name;
oRet.TotalPrice = GetStandardRateAmount(oRequest, GetStandardRates());
// Find any flat rates that apply
List <FlatRate> lstFlatRates = GetFlatRates(oRequest, GetFlatRates());
// Select the cheapest rate for the customer, default is the Standard Rate
foreach (var r in lstFlatRates)
{
if (r.Amount < oRet.TotalPrice)
{
// Overwrite the default Standard Rate with the Flat Rate instead
oRet.RateName = r.Name;
oRet.TotalPrice = r.Amount;
}
}
}
catch (Exception e)
{
// Record any errors in the return object
oRet = new CPRateRS()
{
ErrorHResult = e.HResult,
ErrorMsg = e.ToString()
};
}
return(oRet);
}