/*******************************************************************************
 * 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.utils;

import java.util.ArrayList;
import java.util.List;

import org.simantics.g3d.vtk.Activator;
import org.simantics.g3d.vtk.preferences.CloseMethod;
import org.simantics.g3d.vtk.preferences.PreferenceConstants;
import org.simantics.utils.threads.AWTThread;

import vtk.vtkCamera;
import vtk.vtkObject;
import vtk.vtkPanel;
import vtk.vtkReferenceInformation;
import vtk.vtkRenderWindow;
import vtk.vtkRenderer;

public class vtkPanelUtil {
	
	private static List<vtkPanel> activePanels = new ArrayList<vtkPanel>();
	private static List<vtkPanel> waitingToDeletePanels = new ArrayList<vtkPanel>();
	
	public static void registerPanel(vtkPanel panel) {
		activePanels.add(panel);
	}
	
	public static void unregisterPanel(vtkPanel panel) {
		assert (Thread.currentThread() == AWTThread.getThreadAccess().getThread());
		if (!activePanels.remove(panel))
			return;
		CloseMethod method = getCloseMethod();
		if (method == CloseMethod.ON_LAST_CLOSE) {
			waitingToDeletePanels.add(panel);
		
			if (activePanels.size() == 0) {
				cleanup();
			}
		} else if (method == CloseMethod.ON_CLOSE) {
			dPanel(panel);
			vtkGC();
		} else if (method == CloseMethod.NO_CLOSE) {
			waitingToDeletePanels.add(panel);			
		}
	}
	
	public static CloseMethod getCloseMethod() {
		return CloseMethod.valueOf(Activator.getDefault().getPreferenceStore().getString(PreferenceConstants.CLOSE_METHOD));
	}
	
	private static void cleanup() {
		
		for (vtkPanel p : waitingToDeletePanels) {
			dPanel(p);
		}
		waitingToDeletePanels.clear();
		vtkGC();
	}
	
	private static void vtkGC() {
		vtkReferenceInformation info = vtkObject.JAVA_OBJECT_MANAGER.gc(true);
		System.out.println("Referenced objects when closing editor: " + info.getTotalNumberOfObjects() + "\n");
		System.out.println(info.listRemovedReferenceToString());
		System.out.println(info.listKeptReferenceToString());
	}

	
	private static void dPanel(vtkPanel panel) {
		panel.lock();
		vtkCamera camera = panel.GetRenderer().GetActiveCamera();
		vtkRenderer ren = panel.GetRenderer();
		vtkRenderWindow win = panel.GetRenderWindow();
		win.SetForceMakeCurrent();
		panel.Delete();
		panel = null;
		camera.Delete();
		ren.Delete();
		win.Delete();
	}
}