/*******************************************************************************
 * Copyright (c) 2010-2015 Henshin developers. All rights reserved. 
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     TU Berlin, University of Luxembourg, SES S.A.
 *******************************************************************************/
package de.tub.tfs.muvitor.ui.utils.test;

import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.geometry.Point;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.gef.EditPart;
import org.eclipse.gef.EditPartViewer;
import org.eclipse.gef.EditPartViewer.Conditional;
import org.eclipse.gef.GraphicalEditPart;
import org.eclipse.gef.RequestConstants;
import org.eclipse.gef.requests.ChangeBoundsRequest;

import de.tub.tfs.muvitor.gef.editparts.AdapterGraphicalEditPart;

/**
 * the class is used for the node protection, that means that no node can have a
 * position at another node
 */
public class NodeProtector {
	
	public static void proof(final AdapterGraphicalEditPart<?> nodeEditPart, final Point newLocation) {
		final IFigure nodeFigure = nodeEditPart.getFigure();
		final ChangeBoundsRequest request = new ChangeBoundsRequest(RequestConstants.REQ_MOVE);
		final EditPartViewer viewer = nodeEditPart.getViewer();
		final Conditional conditional = new EditPartViewer.Conditional() {
			@Override
			public boolean evaluate(final EditPart editpart) {
				return editpart != nodeEditPart && editpart.understandsRequest(request);
			}
		};
		
		final Point neededDelta = Point.SINGLETON.setLocation(0, 0);
		
		final Rectangle tempBounds = nodeFigure.getBounds().translate(newLocation);
		
		// top right (move down)
		final GraphicalEditPart conflictingPart = (GraphicalEditPart) viewer.findObjectAtExcluding(
				tempBounds.getTopRight(), null, conditional);
		if (conflictingPart != viewer.getContents()) {
			final Rectangle conflictingFigureBounds = conflictingPart.getFigure().getBounds();
			neededDelta.translate(0,
					conflictingFigureBounds.getBottomLeft().y - tempBounds.getTopRight().y);
			tempBounds.translate(neededDelta);
		}
		
		// bottom right (move left)
		
		// bottom left (move up)
		
		// top left (move right)
		
	}
	
	private NodeProtector() {
	}
}