/// <summary>
/// Gets the next floor the lift will move to.
/// </summary>
private int NextFloor()
{
if (CurrentFloor == (MaxFloors - 1))
{
return(CurrentFloor - 1);
}
if (CurrentFloor == 0)
{
return(CurrentFloor + 1);
}
if (!IsEmpty())
{
int?floorToMoveTo = null;
var mechanics = Passengers.Where(p => p.IsMechanic).ToList();
var regularPassengers = Passengers.Where(p => !p.IsMechanic).ToList();
if (mechanics.Any())
{
floorToMoveTo = CalculateNextFloorLiftNotEmpty(mechanics);
}
else
{
floorToMoveTo = CalculateNextFloorLiftNotEmpty(regularPassengers);
}
if (floorToMoveTo != null)
{
return(floorToMoveTo.Value);
}
}
else if (HasFloorsWithWaitingMechanics())
{
if (PreviousFloor > CurrentFloor)
{
return(Floors.GetMinFloorWaitingMechanic());
}
else if (CurrentFloor > PreviousFloor)
{
return(Floors.GetMaxFloorWaitingMechanic());
}
}
else
{
if (PreviousFloor > CurrentFloor)
{
return(Floors.GetMinFloorWaitingPerson());
}
else if (CurrentFloor > PreviousFloor)
{
return(Floors.GetMaxFloorWaitingPerson());
}
}
return(0);
}