public Task CancelFleet(Guid userId, FleetCancelationData fleetCancelation)
{
if (fleetCancelation == null)
{
throw new ArgumentNullException(nameof(fleetCancelation));
}
EnsureGameIsInProgress();
EnsureUserIsOnline(userId);
EnsureTurnIsInProgress(userId);
var waitingFleets = _state.PlayerStates[userId].WaitingFleets;
var validator = new CancelFleetValidator(waitingFleets.Count);
fleetCancelation.EnsureIsValid(validator);
var fleet = waitingFleets[fleetCancelation.Index];
waitingFleets.RemoveAt(fleetCancelation.Index);
var planet = _map[fleet.From];
planet.Ships += fleet.Ships;
return(Task.CompletedTask);
}
