package org.opentrafficsim.editor.extensions.map;
   
   import java.util.Locale;
   import java.util.Optional;
   
   import org.djunits.value.vdouble.scalar.Length;
   import org.djutils.draw.bounds.Bounds2d;
   import org.djutils.draw.line.PolyLine2d;
   import org.djutils.draw.line.Polygon2d;
  import org.djutils.draw.point.DirectedPoint2d;
  import org.djutils.event.Event;
  import org.djutils.event.EventListener;
  import org.djutils.event.reference.ReferenceType;
  import org.opentrafficsim.base.geometry.OtsShape;
  import org.opentrafficsim.draw.road.AbstractLineAnimation.LaneBasedObjectData;
  import org.opentrafficsim.editor.OtsEditor;
  import org.opentrafficsim.editor.XsdTreeNode;
  import org.opentrafficsim.editor.extensions.Adapters;
  import org.opentrafficsim.road.network.factory.xml.utils.ParseUtil;
  import org.opentrafficsim.xml.bindings.types.LengthBeginEndType.LengthBeginEnd;
  
  /**
   * Data class for objects that are drawn at a lane position. Implementations must call setLinkNode() in their constructor or by
   * some other dynamic means, or the XSD node must have a Link attribute that points to the XSD node of a link by a keyref. This
   * class will listen to attributes Id, Link, Lane and Position, and update visualization as needed. Attributes Id and Link are
   * optional.
   * <p>
   * Copyright (c) 2023-2024 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
   * BSD-style license. See <a href="https://opentrafficsim.org/docs/license.html">OpenTrafficSim License</a>.
   * </p>
   * @author <a href="https://github.com/wjschakel">Wouter Schakel</a>
   */
  public abstract class MapLaneBasedObjectData extends MapData implements LaneBasedObjectData, EventListener
  {
  
      /** Id. */
      private String id = "";
  
      /** Lane. */
      private String lane;
  
      /** Position as entered, e.g. END-20m. */
      private LengthBeginEnd position;
  
      /** Position from start. */
      private Length positionFromStart;
  
      /** Lane width. */
      private Length laneWidth;
  
      /** Location. */
      private DirectedPoint2d location;
  
      /** Bounds. */
      private Bounds2d bounds;
  
      /** Absolute contour. */
      private Polygon2d absoluteContour;
  
      /** Relative contour. */
      private Polygon2d relativeContour;
  
      /** Line on lane. */
      private PolyLine2d line;
  
      /** Node of link. */
      private XsdTreeNode lastLinkNode;
  
      /**
       * Constructor.
       * @param map map.
       * @param node node.
       * @param editor editor.
       */
      public MapLaneBasedObjectData(final EditorMap map, final XsdTreeNode node, final OtsEditor editor)
      {
          super(map, node, editor);
          getNode().addListener(this, XsdTreeNode.ATTRIBUTE_CHANGED, ReferenceType.WEAK);
          if (getNode().isActive())
          {
              if (getNode().isIdentifiable())
              {
                  notify(new Event(XsdTreeNode.ATTRIBUTE_CHANGED, new Object[] {getNode(), "Id", null}));
              }
              if (getNode().hasAttribute("Link"))
              {
                  notify(new Event(XsdTreeNode.ATTRIBUTE_CHANGED, new Object[] {getNode(), "Link", null}));
              }
              notify(new Event(XsdTreeNode.ATTRIBUTE_CHANGED, new Object[] {getNode(), "Lane", null}));
              notify(new Event(XsdTreeNode.ATTRIBUTE_CHANGED, new Object[] {getNode(), "Position", null}));
          }
      }
  
      /**
       * Sets a node as link. Sub-classes may call this in their constructor if it is a fixed node. This class will listen to
       * changes in the Link attribute, and set a coupled node as link node if it exists.
       * @param linkNode link node.
       */
      protected void setLinkNode(final XsdTreeNode linkNode)
     {
         if (this.lastLinkNode != null)
         {
             Optional<MapData> data = getMap().getData(linkNode);
             if (data.isPresent())
             {
                 ((MapLinkData) data.get()).removeListener(this, MapLinkData.LAYOUT_REBUILT);
             }
         }
         this.lastLinkNode = linkNode;
         Optional<MapData> data = getMap().getData(linkNode);
         if (data.isPresent())
         {
             ((MapLinkData) data.get()).addListener(this, MapLinkData.LAYOUT_REBUILT, ReferenceType.WEAK);
         }
     }
 
     @Override
     public void destroy()
     {
         super.destroy();
         getNode().removeListener(this, XsdTreeNode.ATTRIBUTE_CHANGED);
         if (this.lastLinkNode != null)
         {
             this.lastLinkNode.removeListener(this, MapLinkData.LAYOUT_REBUILT);
         }
     }
 
     @Override
     public Length getLaneWidth()
     {
         return this.laneWidth;
     }
 
     @Override
     public DirectedPoint2d getLocation()
     {
         return this.location;
     }
 
     @Override
     public Bounds2d getRelativeBounds()
     {
         return this.bounds;
     }
 
     @Override
     public Polygon2d getAbsoluteContour()
     {
         return this.absoluteContour;
     }
 
     @Override
     public Polygon2d getRelativeContour()
     {
         return this.relativeContour;
     }
 
     @Override
     public PolyLine2d getLine()
     {
         return this.line;
     }
 
     @Override
     public String getId()
     {
         return this.id;
     }
 
     /**
      * Returns an id in the form {linkId}.{laneId}.{id} or {linkId}.{laneId}@{position} if the id is empty.
      * @return id in link/lane/position form.
      */
     protected String getLinkLanePositionId()
     {
         StringBuilder str = new StringBuilder();
         String sep = "";
         if (this.lastLinkNode != null)
         {
             str.append(this.lastLinkNode.getId());
             sep = ".";
         }
         if (this.lane != null)
         {
             str.append(sep).append(this.lane);
         }
         if (this.positionFromStart != null)
         {
             str.append(String.format(Locale.US, "@%.3fm", this.positionFromStart.si));
         }
         return str.toString();
     }
 
     @Override
     public void evalChanged()
     {
         if (getNode().isIdentifiable())
         {
             this.id = getNode().getId() == null ? "" : getNode().getId();
         }
         if (getNode().hasAttribute("Link"))
         {
             XsdTreeNode linkNode = getNode().getCoupledNodeAttribute("Link").orElse(null);
             setLinkNode(linkNode);
         }
         setValue((v) -> this.lane = v, Adapters.get(String.class), getNode(), "Lane");
         setValue((v) -> this.position = v, Adapters.get(LengthBeginEnd.class), getNode(), "Position");
         setLocation();
     }
 
     @Override
     public void notify(final Event event)
     {
         if (event.getType().equals(XsdTreeNode.ATTRIBUTE_CHANGED))
         {
             String attribute = (String) ((Object[]) event.getContent())[1];
             String value = getNode().getAttributeValue(attribute);
             if ("Id".equals(attribute))
             {
                 this.id = value == null ? "" : value;
                 return;
             }
             else if ("Link".equals(attribute))
             {
                 XsdTreeNode linkNode = getNode().getCoupledNodeAttribute("Link").orElse(null);
                 setLinkNode(linkNode);
             }
             else if ("Lane".equals(attribute))
             {
                 setValue((v) -> this.lane = v, Adapters.get(String.class), getNode(), "Lane");
             }
             else if ("Position".equals(attribute))
             {
                 setValue((v) -> this.position = v, Adapters.get(LengthBeginEnd.class), getNode(), "Position");
             }
         }
         // else: MapLinkData.LAYOUT_REBUILT
         setLocation();
     }
 
     /**
      * Set the location from the coordinate and direction. Notify when invalid or valid.
      */
     private void setLocation()
     {
         if (this.lane == null || this.position == null || this.lastLinkNode == null)
         {
             setInvalid();
             return;
         }
         Optional<MapData> linkDataOptional = getMap().getData(this.lastLinkNode);
         if (linkDataOptional.isEmpty())
         {
             setInvalid();
             return;
         }
         MapLinkData linkData = (MapLinkData) linkDataOptional.get();
         MapLaneData laneData = linkData.getLaneData(this.lane);
         if (laneData == null)
         {
             setInvalid();
             return;
         }
         this.positionFromStart =
                 ParseUtil.parseLengthBeginEnd(this.position, Length.ofSI(linkData.getCenterLine().getLength()));
 
         Length w = laneData.getWidth(this.positionFromStart);
         if (this.laneWidth != null && !this.laneWidth.equals(w))
         {
             // animation (see EditorMap.setValid) stores static data that depends on the lane width
             getMap().reinitialize(getNode());
             return;
         }
         this.laneWidth = w;
         double w45 = 0.45 * getLaneWidth().si;
         DirectedPoint2d point = laneData.getCenterLine().getLocationExtended(this.positionFromStart.si);
         this.location = new DirectedPoint2d(point.x, point.y, point.dirZ);
         this.line = new PolyLine2d(new double[] {0.0, 0.0}, new double[] {-w45, w45});
         this.relativeContour = new Polygon2d(PolyLine2d.concatenate(this.line, this.line.reverse()).getPointList());
         this.bounds = LaneBasedObjectData.super.getRelativeBounds();
         this.absoluteContour =
                 new Polygon2d(OtsShape.toAbsoluteTransform(this.location).transform(this.relativeContour.iterator()));
         setValid();
     }
 
 }