/**
 * <copyright>
 *
 * Copyright (c) 2014 itemis and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.html
 *
 * Contributors:
 *     itemis - Initial API and implementation
 *
 * </copyright>
 */
package org.eclipse.sphinx.emf.check.ui.internal;

import java.net.URL;

import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.ImageRegistry;
import org.eclipse.swt.graphics.Image;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.osgi.framework.BundleContext;

/**
 * The activator class controls the plug-in life cycle
 */
public class Activator extends AbstractUIPlugin {

	// The plug-in ID
	public static String PLUGIN_ID = "org.eclipse.sphinx.emf.check.ui"; //$NON-NLS-1$

	// The shared instance
	private static Activator plugin;

	/**
	 * The constructor
	 */
	public Activator() {
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.ui.plugin.AbstractUIPlugin#start(org.osgi.framework.BundleContext )
	 */
	@Override
	public void start(BundleContext bundleContext) throws Exception {
		super.start(bundleContext);
		plugin = this;
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.ui.plugin.AbstractUIPlugin#stop(org.osgi.framework.BundleContext )
	 */
	@Override
	public void stop(BundleContext context) throws Exception {
		plugin = null;
		super.stop(context);
	}

	/**
	 * Returns the shared instance
	 *
	 * @return the shared instance
	 */
	public static Activator getDefault() {
		return plugin;
	}

	@Override
	protected void initializeImageRegistry(ImageRegistry reg) {
		addImageFilePath(CheckValidationImageProvider.FILE);
		addImageFilePath(CheckValidationImageProvider.ERROR_ICO);
		addImageFilePath(CheckValidationImageProvider.WARNING_ICO);
		addImageFilePath(CheckValidationImageProvider.INFO_ICO);
		addImageFilePath(CheckValidationImageProvider.GROUP_ICO);
		addImageFilePath(CheckValidationImageProvider.CHECK_ICO);
	}

	private void addImageFilePath(String relativeURL) {
		Image image = plugin.getImageRegistry().get(relativeURL);
		if (image == null) {
			URL imageURL = plugin.getBundle().getEntry(relativeURL);
			ImageDescriptor descriptor = ImageDescriptor.createFromURL(imageURL);
			image = descriptor.createImage();
			plugin.getImageRegistry().put(relativeURL, image);
		}
	}

	public static ImageDescriptor getImageDescriptor(String relativeURL) {
		URL entry = plugin.getBundle().getEntry(relativeURL);
		if (entry != null) {
			return ImageDescriptor.createFromURL(entry);
		}
		return null;
	}
}