public IOngoingDeal PerformProposal()
{
if (!CanPerformProposal())
{
throw new InvalidOperationException("CanPerformProposal must return true");
}
var ongoingFromSender = new List <IOngoingDiplomaticExchange>();
var ongoingToReceiver = new List <IOngoingDiplomaticExchange>();
var ongoingBilateral = new List <IOngoingDiplomaticExchange>();
foreach (var offer in offeredBySender)
{
var ongoingExchange = offer.ExecuteBetweenCivs(Sender, Receiver);
if (ongoingExchange != null)
{
ongoingFromSender.Add(ongoingExchange);
}
}
foreach (var demand in demandedOfReceiver)
{
var ongoingExchange = demand.ExecuteBetweenCivs(Receiver, Sender);
if (ongoingExchange != null)
{
ongoingToReceiver.Add(ongoingExchange);
}
}
foreach (var bilateralExchange in bilateralExchanges)
{
var ongoingExchange = bilateralExchange.ExecuteBetweenCivs(Sender, Receiver);
if (ongoingExchange != null)
{
ongoingBilateral.Add(ongoingExchange);
}
}
if (ongoingFromSender.Count > 0 || ongoingToReceiver.Count > 0 || ongoingBilateral.Count > 0)
{
var ongoingDeal = new OngoingDeal(Sender, Receiver, ongoingFromSender, ongoingToReceiver, ongoingBilateral);
return(ongoingDeal);
}
else
{
return(null);
}
}