/*******************************************************************************
 * Copyright (c) 2003, 2006 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.navigator.resources.plugin;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.Collections;

import org.eclipse.core.runtime.FileLocator;
import org.eclipse.core.runtime.Path;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.ImageRegistry;
import org.eclipse.swt.graphics.Image;
import org.eclipse.ui.internal.navigator.NavigatorPlugin;

/**
 * Handles all images and icons for the ui.
 * 
 * <p>
 * <strong>EXPERIMENTAL</strong>. This class or interface has been added as part of a work in
 * progress. There is a guarantee neither that this API will work nor that it will remain the same.
 * Please do not use this API without consulting with the Platform/UI team.
 * </p>
 * 
 * @since 3.2
 */
public class NavigatorUIPluginImages {

	private static URL fgIconLocation;

	// Create image registry
	private final static ImageRegistry NAVIGATORUIPLUGIN_REGISTRY = NavigatorPlugin.getDefault().getImageRegistry();

	// Create the icon location
	static {
		String pathSuffix = "icons/full/"; //$NON-NLS-1$ 
		fgIconLocation = FileLocator.find(NavigatorPlugin.getDefault().getBundle(), new Path(pathSuffix), Collections.EMPTY_MAP);
	}

	/**
	 * Gets the current image.
	 * 
	 * @param key -
	 *            Name of the icon.
	 * @return Image
	 */
	public static Image get(String key) {
		return NAVIGATORUIPLUGIN_REGISTRY.get(key);
	}

	/**
	 * Create and returns a image descriptor.
	 * 
	 * @param String
	 *            prefix - Icon dir structure.
	 * @param String
	 *            name - The name of the icon.
	 * @return ImageDescriptor
	 */
	private static ImageDescriptor create(String prefix, String name) {
		return ImageDescriptor.createFromURL(makeIconFileURL(prefix, name));
	}

	/**
	 * Creates the icon url
	 * 
	 * @param String
	 *            prefix - Icon dir structure.
	 * @param String
	 *            name - The name of the icon.
	 * @return URL
	 */
	private static URL makeIconFileURL(String prefix, String name) {
		StringBuffer buffer = new StringBuffer(prefix);
		buffer.append(name);
		try {
			return new URL(fgIconLocation, buffer.toString());
		} catch (MalformedURLException ex) {

			return null;
		}
	}

	/**
	 * Sets the three image descriptors for enabled, disabled, and hovered to an action. The actions
	 * are retrieved from the *lcl16 folders.
	 * 
	 * @param action
	 *            the action
	 * @param iconName
	 *            the icon name
	 */
	public static void setLocalImageDescriptors(IAction action, String iconName) {
		setImageDescriptors(action, "lcl16/", iconName); //$NON-NLS-1$
	}

	/**
	 * Sets all available image descriptors for the given action.
	 * 
	 * @param action -
	 *            The action associated with the icon.
	 * @param type -
	 *            The type of icon.
	 * @param relPath -
	 *            The relative path of the icon.
	 */
	public static void setImageDescriptors(IAction action, String type, String relPath) {
		// /*relPath= relPath.substring(NAVIGATORUI_NAME_PREFIX_LENGTH);*/
		// action.setDisabledImageDescriptor(create("d" + type, relPath));
		// //$NON-NLS-1$
		// action.setHoverImageDescriptor(create("c" + type, relPath));
		// //$NON-NLS-1$
		action.setImageDescriptor(create("e" + type, relPath)); //$NON-NLS-1$
	}

}