/*******************************************************************************
 * Copyright (c) 2012, 2013 Association for Decentralized Information Management in
 * Industry THTH ry.
 * 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:
 *     VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
package org.simantics.g3d.vtk.handlers;

import java.util.HashMap;
import java.util.Map;

import javax.vecmath.Vector3d;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.handlers.HandlerUtil;
import org.simantics.g3d.vtk.action.vtkAction;
import org.simantics.g3d.vtk.common.VtkView;
import org.simantics.g3d.vtk.swt.vtkCameraAndSelectorAction;
import org.simantics.utils.threads.ThreadUtils;

public class CameraPositionHandler extends AbstractHandler {

	
	private Map<VtkView,Vector3d> cameraPos = new HashMap<VtkView, Vector3d>();
	
	@Override
	public Object execute(ExecutionEvent event) throws ExecutionException {

		final IWorkbenchPart ap = HandlerUtil.getActiveEditor(event);
		final VtkView panel = (VtkView)ap.getAdapter(VtkView.class);

		String param = event.getParameter("org.simantics.g3d.viewDirection");
		String vals[] = param.split(",");
		final Vector3d direction = new Vector3d(Double.parseDouble(vals[0]),Double.parseDouble(vals[1]),Double.parseDouble(vals[2]));


		ThreadUtils.asyncExec(panel.getThreadQueue(), new Runnable() {

			@Override
			public void run() {

				Vector3d focal = new Vector3d(panel.getRenderer().GetActiveCamera().GetFocalPoint());
				Vector3d pos = new Vector3d(panel.getRenderer().GetActiveCamera().GetPosition());
				cameraPos.put(panel, pos);
				Vector3d dir = new Vector3d(pos);
				dir.sub(focal);
				double distance = dir.length();

				dir.set(direction);
				dir.scale(distance);
				dir.add(focal);
				
				panel.getRenderer().GetActiveCamera().SetPosition(dir.x, dir.y, dir.z);
				
				vtkAction action = panel.getDefaultAction();
				if (action instanceof vtkCameraAndSelectorAction)
					((vtkCameraAndSelectorAction)action).focus(focal.x, focal.y, focal.z);
				else {
					if (Math.abs(direction.dot(new Vector3d(0,1,0))) < 0.95)
						panel.getRenderer().GetActiveCamera().SetViewUp(0, 1, 0);
					else
						panel.getRenderer().GetActiveCamera().SetViewUp(1, 0, 0);

					panel.getRenderer().ResetCameraClippingRange();
				}
				
				//panel.UpdateLight();
				panel.refresh();
			}
		});

		return null;

	}

	
}