/*
 File: DeleteAction.java

 Copyright (c) 2006, 2010, The Cytoscape Consortium (www.cytoscape.org)

 This library is free software; you can redistribute it and/or modify it
 under the terms of the GNU Lesser General Public License as published
 by the Free Software Foundation; either version 2.1 of the License, or
 any later version.

 This library is distributed in the hope that it will be useful, but
 WITHOUT ANY WARRANTY, WITHOUT EVEN THE IMPLIED WARRANTY OF
 MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  The software and
 documentation provided hereunder is on an "as is" basis, and the
 Institute for Systems Biology and the Whitehead Institute
 have no obligations to provide maintenance, support,
 updates, enhancements or modifications.  In no event shall the
 Institute for Systems Biology and the Whitehead Institute
 be liable to any party for direct, indirect, special,
 incidental or consequential damages, including lost profits, arising
 out of the use of this software and its documentation, even if the
 Institute for Systems Biology and the Whitehead Institute
 have been advised of the possibility of such damage.  See
 the GNU Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public License
 along with this library; if not, write to the Free Software Foundation,
 Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 */

//---------------------------------------------------------------------------
package cytoscape.actions;

import giny.model.GraphObject;
import giny.view.EdgeView;
import giny.view.NodeView;

import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import javax.swing.event.MenuEvent;

import cytoscape.CyEdge;
import cytoscape.CyNetwork;
import cytoscape.CyNode;
import cytoscape.Cytoscape;
import cytoscape.logger.CyLogger;
import cytoscape.util.CytoscapeAction;
import cytoscape.util.undo.CyUndo;
import cytoscape.view.CyNetworkView;


/**
 *
 * action for deleting selected Cytoscape nodes and edges
 *
 * @author Allan Kuchinsky, Agilent Technologies
 * @version 1.0
 *
 */
public class DeleteAction extends CytoscapeAction {
	private static final long serialVersionUID = -5769255815829787466L;

	/**
	 * 
	 */
	public static final String ACTION_TITLE = "Delete Selected Nodes and Edges";

	private GraphObject graphObj = null;

	/**
	 * action for deleting selected Cytoscape nodes and edges
	 */
	public DeleteAction() {
		this(null);
	}

	/**
	 * perform deletion on the input object. if object is a Node, then this will
	 * result in also deleting the edges adjacent to the node
	 *
	 * @param obj the object to be deleted
	 */

	public DeleteAction(GraphObject obj) {
		super(ACTION_TITLE);
		CyLogger.getLogger().info("starting delete action");
		setPreferredMenu("Edit");
		setAcceleratorCombo(KeyEvent.VK_DELETE, 0);
		graphObj = obj;
		CyLogger.getLogger().info("ending delete action");
	}


	/**
	 * Delete all selected nodes, edges, edges adjacent to the selected nodes,
	 * and any nodes/edges passed as arguments.
	 */
	public void actionPerformed(ActionEvent ae) {

		CyNetworkView myView = Cytoscape.getCurrentNetworkView();
		CyNetwork cyNet = myView.getNetwork();
		List<EdgeView> edgeViews = myView.getSelectedEdges();
		List<NodeView> nodeViews = myView.getSelectedNodes();
		CyNode cyNode;
		CyEdge cyEdge;
		NodeView nv;
		EdgeView ev;

		// if an argument exists, add it to the appropriate list
		if (graphObj != null ) {
			if ( graphObj instanceof giny.model.Node) {
				cyNode = (CyNode) graphObj;
				nv = Cytoscape.getCurrentNetworkView().getNodeView(cyNode);
				if ( !nodeViews.contains(nv) )
					nodeViews.add(nv);
			} else if ( graphObj instanceof giny.model.Edge) {
				cyEdge = (CyEdge) graphObj;
				ev = Cytoscape.getCurrentNetworkView().getEdgeView(cyEdge);
				if ( !edgeViews.contains(ev) )
					edgeViews.add(ev);
			}
		}

		Set<Integer> edgeIndices = new HashSet<Integer>();
		Set<Integer> nodeIndices = new HashSet<Integer>();

		// add all node indices
		for (int i = 0; i < nodeViews.size(); i++) {
			nv = (NodeView) nodeViews.get(i);
			cyNode = (CyNode) nv.getNode();
			nodeIndices.add(cyNode.getRootGraphIndex());

			// add adjacent edge indices for each node 
			int[] edgesList = cyNet.getAdjacentEdgeIndicesArray(cyNode.getRootGraphIndex(),true,true,true);
			for ( int x = 0; x < edgesList.length; x++ )
				edgeIndices.add(edgesList[x]);
		}

		// add all selected edge indices
		for (int i = 0; i < edgeViews.size(); i++) {
			ev = (EdgeView) edgeViews.get(i); 
			cyEdge = (CyEdge) ev.getEdge();
			edgeIndices.add( cyEdge.getRootGraphIndex() );
		}

		// convert
		int i = 0;
		int[] edgeInd = new int[edgeIndices.size()];
		for (Integer ei : edgeIndices) 
			edgeInd[i++] = ei.intValue();

		i = 0;
		int[] nodeInd = new int[nodeIndices.size()];
		for (Integer ni : nodeIndices) 
			nodeInd[i++] = ni.intValue();

		CyUndo.getUndoableEditSupport().postEdit( new DeleteEdit(cyNet,nodeInd,edgeInd, this) );

		// delete the actual nodes and edges
		cyNet.hideEdges(edgeInd);
		cyNet.hideNodes(nodeInd);

		Cytoscape.firePropertyChange(Cytoscape.NETWORK_MODIFIED, myView, cyNet);
	}

    public void menuSelected(MenuEvent me) {
        CyNetwork n = Cytoscape.getCurrentNetwork();
        if ( n == null || n == Cytoscape.getNullNetwork() ) {
            setEnabled(false);
            return;
        }

        java.util.Set nodes = n.getSelectedNodes();
        java.util.Set edges = n.getSelectedEdges();

        if ( ( nodes != null && nodes.size() > 0 ) || 
		     ( edges != null && edges.size() > 0 ) )
        {
 
        	setEnabled(true); 	
        }
            
        else
            setEnabled(false);
    }
    
}