//Copyright (c) 2000-2003  San Diego Supercomputer Center (SDSC),
//a facility operated by the University of California, San Diego (UCSD)
//
//Users and possessors of this source code are hereby granted a
//nonexclusive, royalty-free copyright and design patent license to
//use this code in individual software.  License is not granted for
//commercial resale, in whole or in part, without prior written
//permission from SDSC.  This source is provided "AS IS" without express
//or implied warranty of any kind.
//
//For further information, please see:  http://mbt.sdsc.edu
//

package edu.sdsc.mbt.viewables;

import edu.sdsc.mbt.util.*;
import java.util.prefs.*;


/**
 * This class encapsulates element color settings and is used to provide persistence
 * to user settings by saving current colors to filesystem storage and reading them 
 * when loading the application and opening the element editing dialog.
 * @see edu.sdsc.mbt.viewables.StructureStyles
 * @see edu.sdsc.mbt.viewables.StylesPreferences
 * @see edu.sdsc.sirius.dialogs.ElementStylesDialog
 * 
 * @author Oleksandr V. Buzko
 */
public class ElementPreferences {
	
	private float[][] colors = null;
	
	public ElementPreferences(){
		colors = new float[PeriodicTable.getElementCount() + 1][4];//to keep indices the same as atomic numbers
	}
	
	/**
	 * Read currently set element color preferences from ElementStyles
	 */
	public void getCurrentConfiguration(){
		//get element colors from ElementStyles
		for (int i = 1; i < PeriodicTable.getElementCount(); i++){
			float[] temp = ElementProperties.getElementColor(i);

			colors[i][0] = temp[0];
			colors[i][1] = temp[1];
			colors[i][2] = temp[2];
		}
	}
	
	/**
	 * Apply currently stored in this instance colors to ElementStyles.
	 */
	public void applyConfiguration(){
		
		for (int i = 1; i < PeriodicTable.getElementCount(); i++){
			ElementProperties.setElementColor(i, colors[i][0], colors[i][1], colors[i][2]);
		}
	}
	
	/**
	 * Save current color settings to the filesystem.
	 */
	public void writePreferences(){
		
		Preferences root = Preferences.userRoot();
		final Preferences node = root.node("/edu/sdsc/siriuswb/viewer/elements");
		
		for (int i = 1; i < PeriodicTable.getElementCount(); i++){
			node.putFloat("color" + i + "0", colors[i][0]);
			node.putFloat("color" + i + "1", colors[i][1]);
			node.putFloat("color" + i + "2", colors[i][2]);
		}
		try{
			node.flush();
		}
		catch (BackingStoreException ex){
			System.out.println("Unable to save element preferences: " + ex);
		}
	}

	
	/**
	 * Open current color settings from persistent storage.
	 */
	public void readPreferences(){
		
		Preferences root = Preferences.userRoot();
		final Preferences node = root.node("/edu/sdsc/siriuswb/viewer/elements");
		
		for (int i = 1; i < PeriodicTable.getElementCount(); i++){
			colors[i][0] = node.getFloat("color" + i + "0", colors[i][0]);
			colors[i][1] = node.getFloat("color" + i + "1", colors[i][1]);
			colors[i][2] = node.getFloat("color" + i + "2", colors[i][2]);
		}
	}

}