public Ticket TryPark(Car car, out string message)
{
if (car == null ||
Boys.SelectMany(boy => boy.Lots)
.Any(lot => lot.HaveCar(car)) ||
Lots.Any(lot => lot.HaveCar(car)))
{
message = "Please provide valid car.";
return(null);
}
var boy = Boys.Concat(new List <Boy>()
{
this
})
.Where(boy => boy.FindLotWithStrategy() != null).FirstOrDefault();
if (boy != null)
{
return(boy.Park(car, out message));
}
else
{
message = "Not enough position.";
return(null);
}
}