/*
 Copyright (c) 1998-2005 The Regents of the University of California
 All rights reserved.
 Permission is hereby granted, without written agreement and without
 license or royalty fees, to use, copy, modify, and distribute this
 software and its documentation for any purpose, provided that the above
 copyright notice and the following two paragraphs appear in all copies
 of this software.

 IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
 FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
 THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
 SUCH DAMAGE.

 THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
 PROVIDED HEREUNDER IS ON AN  BASIS, AND THE UNIVERSITY OF
 CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
 ENHANCEMENTS, OR MODIFICATIONS.

 PT_COPYRIGHT_VERSION_2
 COPYRIGHTENDKEY
 */
package diva.graph;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

import diva.canvas.Figure;
import diva.canvas.connector.Connector;
import diva.canvas.event.LayerEvent;
import diva.canvas.interactor.DragInteractor;

/**
 * An interactor that drags nodes.
 *
 * @author         Michael Shilman
 * @author         John Reekie
 * @version        $Id: NodeDragInteractor.java 38798 2005-07-08 20:00:01Z cxh $
 * @Pt.AcceptedRating Red
 */
public class NodeDragInteractor extends DragInteractor {
    /**
     * The graph controller that manages this interactor.
     */
    private GraphController _controller;

    /** Create a new NodeDragInteractor and give it a pointer
     * to its controller to it can find other useful objects
     */
    public NodeDragInteractor(GraphController controller) {
        _controller = controller;
    }

    /** Return the controller set in the constructor.
     *  @return The controller.
     */
    public GraphController getController() {
        return _controller;
    }

    /** Drag all selected nodes and move any attached edges
     */
    public void translate(LayerEvent e, double x, double y) {
        GraphModel model = _controller.getGraphModel();
        Iterator i = targets();
        Set edgeSet = new HashSet();

        while (i.hasNext()) {
            Figure t = (Figure) i.next();

            // Translate anything that is not an edge
            // FIXME: we want to drag edges that are not connected
            // at either end
            // FIXME: translate edges that are connected on both ends
            // to targets?
            if (!(model.isEdge(t.getUserObject()))) {
                // Perform an inverse transform on coordinates for
                // composite nodes??
                // FIXME: This isn't right for scaling canvases... so I
                // doubt it is right for composite nodes.
                // TransformContext tc = t.getParent().getTransformContext();
                // tc.getInverseTransform().deltaTransform(pt, localpt);
                //t.translate(localpt.x,localpt.y);
                t.translate(x, y);
            }
        }

        edgeSet.addAll(GraphUtilities.edgeSet(model.getRoot(), model));

        // We used to do all this to figure out the correct edges to
        // route, but it is rather slow, so now we reroute all the
        // edges.
        //         i = targets();
        //            while (i.hasNext()) {
        //             Figure t = (Figure) i.next();
        //             System.out.println("obj = " + t.getUserObject());
        //             // Remember the edges so we route them later.
        //             if (model.isNode(t.getUserObject())) {
        //                 Iterator j;
        //                 j = model.inEdges(t.getUserObject());
        //                 while (j.hasNext()) {
        //                     edgeSet.add(j.next());
        //                 }
        //                 j = model.outEdges(t.getUserObject());
        //                 while (j.hasNext()) {
        //                     edgeSet.add(j.next());
        //                 }
        //                 if (model.isComposite(t.getUserObject())) {
        //                     j = GraphUtilities.partiallyContainedEdges(t.getUserObject(),
        //                                                                model);
        //                     while (j.hasNext()) {
        //                         edgeSet.add(j.next());
        //                     }
        //                 }
        //             }
        //         }
        for (Iterator edges = edgeSet.iterator(); edges.hasNext();) {
            Object edge = edges.next();
            Connector c = (Connector) (_controller.getFigure(edge));

            if (c != null) {
                c.reroute();
            }
        }
    }

    /**
     * Route all edges attached to the given node.
     *
     * FIXME: currently inefficient.
     * Rewrite this to use the X and Y coordinates.

     private void routeAttachedEdges(Object node, double x, double y) {
     // We have to check for null figures, since if an edge is
     // connected at only one end in one view, other views will
     // have no edge figure for that edge.
     GraphModel model = _controller.getGraphModel();
     for (Iterator ins = model.inEdges(node); ins.hasNext(); ) {
     Connector c = (Connector) (_controller.getFigure(ins.next()));
     if (c != null) {
     c.reroute();
     }
     }
     for (Iterator outs = model.outEdges(node); outs.hasNext(); ) {
     Connector c = (Connector) (_controller.getFigure(outs.next()));
     if (c != null) {
     c.reroute();
     }
     }
     if (model.isComposite(node)) {
     for (Iterator contained = model.nodes(node);
     contained.hasNext(); ) {
     routeAttachedEdges(contained.next(), x, y);
     }
     }
     }*/
}