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.common.InteractiveVtkPanel;
import org.simantics.utils.threads.AWTThread;
import org.simantics.utils.threads.ThreadUtils;

public class CameraPositionHandler extends AbstractHandler {

	
	private Map<InteractiveVtkPanel,Vector3d> cameraPos = new HashMap<InteractiveVtkPanel, Vector3d>();
	
	@Override
	public Object execute(ExecutionEvent event) throws ExecutionException {
	     
	     final IWorkbenchPart ap = HandlerUtil.getActiveEditor(event);
	     final InteractiveVtkPanel panel = (InteractiveVtkPanel)ap.getAdapter(InteractiveVtkPanel.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(AWTThread.getThreadAccess(), 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);
				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.repaint();
			}
		 });
	    
	     return null;
	     
	}
	
	
}