public override void FindTargets(ref Dictionary <string, int> available)
        {
            if (!IsEnabled())
            {
                return;
            }

            if (TargetList.Count >= GetMaximumTargets())
            {
                if (PotentialTargetList.Count > 0)
                {
                    m_lastInvalidTargetReason = "Maximum targets reached.  Add more upgrades!";
                }

                return;
            }

            using (Lock.AcquireExclusiveUsing())
            {
                for (int r = PotentialTargetList.Count - 1; r >= 0; r--)
                {
                    if (m_constructionBlock.IsUserDefinedLimitReached())
                    {
                        m_lastInvalidTargetReason = "User defined maximum nanite limit reached";
                        return;
                    }

                    var item = (IMyPlayer)PotentialTargetList[r];
                    if (TargetList.Contains(item))
                    {
                        continue;
                    }

                    if (item.Controller == null || item.Controller.ControlledEntity == null || item.Controller.ControlledEntity.Entity == null)
                    {
                        PotentialTargetList.RemoveAt(r);
                        continue;
                    }

                    var  blockList = NaniteConstructionManager.GetConstructionBlocks((IMyCubeGrid)m_constructionBlock.ConstructionBlock.CubeGrid);
                    bool found     = false;
                    foreach (var block in blockList)
                    {
                        if (block.Targets.First(x => x is NaniteMedicalTargets).TargetList.Contains(item))
                        {
                            found = true;
                            break;
                        }
                    }

                    if (found)
                    {
                        m_lastInvalidTargetReason = "Another factory has this block as a target";
                        continue;
                    }

                    if (Vector3D.DistanceSquared(m_constructionBlock.ConstructionBlock.GetPosition(), item.GetPosition()) < m_maxDistance * m_maxDistance &&
                        NaniteConstructionPower.HasRequiredPowerForNewTarget((IMyFunctionalBlock)m_constructionBlock.ConstructionBlock, this))
                    {
                        TargetList.Add(item);
                        Logging.Instance.WriteLine(string.Format("ADDING Medical Target: conid={0} type={1} playerName={2} position={3}", m_constructionBlock.ConstructionBlock.EntityId, item.GetType().Name, item.DisplayName, item.GetPosition()));
                        if (TargetList.Count >= GetMaximumTargets())
                        {
                            break;
                        }
                    }
                }
            }
        }