private static decimal GetSupplementRate(DonationEventType eventType) => _eventTypeRateDictionary.ContainsKey(eventType) ? _eventTypeRateDictionary[eventType] : 0;
public DonationEventLog(string eventData, DonationEventType type, string?userId = null)
{
EventData = eventData;
UserId = userId;
Type = type;
}
// would usually have this in its own class as it feels to be unrelated breaking cohesion,
// but seems a bit overkill to do so in this case, perhaps even a simple static helper would be better
public decimal GetGiftAidSupplementAmount(decimal giftAidAmount, DonationEventType eventType)
{
var supplementRate = GetSupplementRate(eventType);
return(RoundToTwoPlaces(giftAidAmount * supplementRate * 0.01m));
}