/// <summary>
/// Calculate call chareg
/// </summary>
/// <param name="customer">Customer who made the call</param>
/// <param name="cdr">CDR record of the call to calculate the chareg</param>
/// <param name="package">Package of the customer</param>
/// <returns>Charge for the given call (using CDR)</returns>
public decimal CalcluateCallCharge(Customer customer, CallDetailsRecord cdr, Package package)
{
var billingPeriodType = GetBillingPeriodType(cdr.StartTime, package);
var callType = GetCallType(customer.PhoneNumber, cdr.RecievingPhoneNumber);
var charge = package.CallCharges.Where(c => c.PeriodType == billingPeriodType && c.CallType == callType).First();
var paidDurationInSeconds = GetPaidCallDuration(customer, cdr, package);
return(GetCharegesForTheCall(charge, paidDurationInSeconds));
}
/// <summary>
/// Convert a CallDetailsRecord (CDR) object to CallDetails object (call details objects in mobile bills)
/// </summary>
/// <param name="cdr">CDR to convert</param>
/// <param name="customer">Customer who owns the CDR</param>
/// <param name="package">Customer Package</param>
/// <returns></returns>
private CallDetails GetCallDetailsFromCdr(CallDetailsRecord cdr, Customer customer, Package package)
{
var callDetails = new CallDetails();
callDetails.StartTime = cdr.StartTime;
callDetails.DestinationNumber = cdr.RecievingPhoneNumber;
callDetails.DurationInSeconds = cdr.DurationInSeconds;
callDetails.Charge = package.CallChargeCalcluationStratergy.CalcluateCallCharge(customer, cdr, package);
return(callDetails);
}
/// <summary>
/// Get paid call duration (i.e. total call duration in seconds - no of free seconds)
/// </summary>
/// <returns>Call duration that requires to be paied</returns>
private int GetPaidCallDuration(Customer customer, CallDetailsRecord cdr, Package package)
{
var freeCallDuration = package.FreeCallDurations
.Where(d => d.CallType == GetCallType(customer.PhoneNumber, cdr.OriginatingPhoneNumber) &&
d.PeriodType == GetBillingPeriodType(cdr.StartTime, package))
.FirstOrDefault()?.DurationInSeconds ?? 0;
if (cdr.DurationInSeconds > freeCallDuration)
{
return(cdr.DurationInSeconds - freeCallDuration);
}
else
{
return(0);
}
}