/*******************************************************************************
 * Copyright (c) 2013, 2015 IBM Corporation and others.
 * 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:
 *     IBM Corporation - initial API and implementation
 ******************************************************************************/

package org.eclipse.ui.internal.themes;

import java.util.Hashtable;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExecutableExtension;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.ui.themes.ColorUtil;
import org.eclipse.ui.themes.IColorFactory;

/**
 * @since 3.105
 *
 */
public class RGBBrightnessColorFactory implements IColorFactory, IExecutableExtension {

	String color, scaleFactor;

	@Override
	public RGB createColor() {
		RGB rgb = ColorUtil.getColorValue(color);
		float scale = Float.parseFloat(scaleFactor);
		float[] hsb = rgb.getHSB();
		float b = hsb[2] * scale;
		if (b < 0)
			b = 0;
		if (b > 1)
			b = 1;
		return new RGB(hsb[0], hsb[1], b);
	}

	/**
	 * This executable extension requires parameters to be explicitly declared
	 * via the second method described in the <code>IExecutableExtension</code>
	 * documentation. This class expects that there will be two parameters,
	 * <code>color</code> that describe the color to be blended (this values may
	 * either be RGB triples or SWT constants) and <code>scaleFactor</code>
	 * which is the brightness scale factor with 1.0 having the same brightness
	 * as the original color.
	 *
	 * @see org.eclipse.core.runtime.IExecutableExtension#setInitializationData(org.eclipse.core.runtime.IConfigurationElement,
	 *      java.lang.String, java.lang.Object)
	 */
	@Override
	public void setInitializationData(IConfigurationElement config, String propertyName, Object data)
			throws CoreException {
		if (data instanceof Hashtable) {
			Hashtable table = (Hashtable) data;
			color = (String) table.get("color"); //$NON-NLS-1$
			scaleFactor = (String) table.get("scaleFactor"); //$NON-NLS-1$
		}
	}

}