package org.opentrafficsim.sim0mq.publisher;
   
   import java.rmi.RemoteException;
   
   import org.djunits.unit.DirectionUnit;
   import org.djunits.unit.PositionUnit;
   import org.djunits.value.vdouble.scalar.Direction;
   import org.djunits.value.vdouble.vector.PositionVector;
   import org.djutils.metadata.MetaData;
  import org.djutils.metadata.ObjectDescriptor;
  import org.djutils.serialization.SerializationException;
  import org.opentrafficsim.core.geometry.OTSPoint3D;
  import org.opentrafficsim.core.network.Node;
  import org.opentrafficsim.core.network.OTSNetwork;
  import org.sim0mq.Sim0MQException;
  
  /**
   * Transceiver for Node data.
   * <p>
   * Copyright (c) 2020-2020 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
   * BSD-style license. See <a href="http://opentrafficsim.org/docs/current/license.html">OpenTrafficSim License</a>.
   * </p>
   * @author <a href="http://www.tbm.tudelft.nl/averbraeck">Alexander Verbraeck</a>
   * @author <a href="http://www.tudelft.nl/pknoppers">Peter Knoppers</a>
   * @author <a href="http://www.transport.citg.tudelft.nl">Wouter Schakel</a>
   */
  public class NodeTransceiver extends AbstractTransceiver
  {
      /** The OTS network. */
      private final OTSNetwork network;
  
      /** Transceiver for the Node ids. */
      private final TransceiverInterface nodeIdSource;
  
      /**
       * Construct a new NodeTransceiver.
       * @param network OTSNetwork; the network
       * @param nodeIdSource NodeIdTransceiver; the transceiver that can produce all Node ids in the Network
       */
      public NodeTransceiver(final OTSNetwork network, final NodeIdTransceiver nodeIdSource)
      {
          super("Node transceiver",
                  new MetaData("Node id", "Node id",
                          new ObjectDescriptor[] { new ObjectDescriptor("Node id", "Node id", String.class) }),
                  new MetaData("Node data", "Node id, position, direction, number of Links",
                          new ObjectDescriptor[] { new ObjectDescriptor("Node id", "Node id", String.class),
                                  new ObjectDescriptor("Position", "Position", PositionVector.class),
                                  new ObjectDescriptor("Direction", "Direction", Direction.class),
                                  new ObjectDescriptor("Number of links", "Number of links", Integer.class) }));
          this.network = network;
          this.nodeIdSource = nodeIdSource;
      }
  
      /** {@inheritDoc} */
      @Override
      public Object[] get(final Object[] address, final ReturnWrapper returnWrapper)
              throws RemoteException, Sim0MQException, SerializationException
      {
          String bad = verifyMetaData(getAddressFields(), address);
          if (bad != null)
          {
              returnWrapper.nack(bad);
              return null;
          }
          Node node = this.network.getNode((String) address[0]);
          if (null == node)
          {
              returnWrapper.nack("Network does not contain a node with id " + address[0]);
              return null;
          }
          return new Object[] { node.getId(), node.getPoint().doubleVector(PositionUnit.METER),
                  OTSPoint3D.direction(node.getLocation(), DirectionUnit.EAST_RADIAN), node.getLinks().size() };
      }
  
      /** {@inheritDoc} */
      @Override
      public TransceiverInterface getIdSource(final int addressLevel, final ReturnWrapper returnWrapper)
              throws Sim0MQException, SerializationException
      {
          if (addressLevel != 0)
          {
              returnWrapper.nack("Only empty address is valid");
              return null;
          }
          return this.nodeIdSource;
      }
  
      /** {@inheritDoc} */
      @Override
      public boolean hasIdSource()
      {
          return true;
      }
  
      /** {@inheritDoc} */
      @Override
      public String toString()
      {
          return "NodeTransceiver [network=" + this.network + ", super=" + super.toString() + "]";
     }
 
 }