/*******************************************************************************
 * Copyright (c) 2009 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
 *     Zend Technologies
 *******************************************************************************/
package org.eclipse.php.internal.server.ui;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import java.util.Iterator;

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.swt.graphics.Point;

/**
 * Bundle of most images used by the PHP Debug UI plug-in.
 */
public class ServersPluginImages {

	private static final String NAME_PREFIX = "org.eclipse.php.server.ui."; //$NON-NLS-1$
	private static final int NAME_PREFIX_LENGTH = NAME_PREFIX.length();

	private static URL fgIconBaseURL = null;

	// Determine display depth. If depth > 4 then we use high color images.
	// Otherwise low color
	// images are used
	static {
		fgIconBaseURL = Activator.getDefault().getBundle().getEntry("/icons/full/"); //$NON-NLS-1$
	}

	// The plug-in registry
	private static ImageRegistry fgImageRegistry = null;
	private static HashMap fgAvoidSWTErrorMap = null;

	private static final String T_OBJ = "obj16"; //$NON-NLS-1$
	private static final String T_WIZBAN = "wizban"; //$NON-NLS-1$

	public static final String IMG_SERVER = NAME_PREFIX + "server.png"; //$NON-NLS-1$
	public static final String IMG_WIZ_SERVER = NAME_PREFIX + "server_wiz.png"; //$NON-NLS-1$

	public static final ImageDescriptor DESC_SERVER = createManaged(T_OBJ, IMG_SERVER);
	public static final ImageDescriptor DESC_WIZ_SERVER = createManaged(T_WIZBAN, IMG_WIZ_SERVER);

	/**
	 * Returns the image managed under the given key in this registry.
	 * 
	 * @param key
	 *            the image's key
	 * @return the image managed under the given key
	 */
	public static Image get(String key) {
		return getImageRegistry().get(key);
	}

	/**
	 * Sets the three image descriptors for enabled, disabled, and hovered to an
	 * action. The actions are retrieved from the *tool16 folders.
	 * 
	 * @param action
	 *            the action
	 * @param iconName
	 *            the icon name
	 */
	public static void setToolImageDescriptors(IAction action, String iconName) {
		setImageDescriptors(action, "tool16", iconName); //$NON-NLS-1$
	}

	/**
	 * 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); //$NON-NLS-1$
	}

	/*
	 * Helper method to access the image registry from the PHPPlugin class.
	 */
	static ImageRegistry getImageRegistry() {
		if (fgImageRegistry == null) {
			fgImageRegistry = new ImageRegistry();
			for (Iterator iter = fgAvoidSWTErrorMap.keySet().iterator(); iter.hasNext();) {
				String key = (String) iter.next();
				fgImageRegistry.put(key, (ImageDescriptor) fgAvoidSWTErrorMap.get(key));
			}
			fgAvoidSWTErrorMap = null;
		}
		return fgImageRegistry;
	}

	// ---- Helper methods to access icons on the file system
	// --------------------------------------

	private static void setImageDescriptors(IAction action, String type, String relPath) {

		try {
			ImageDescriptor id = ImageDescriptor.createFromURL(makeIconFileURL("d" + type, relPath)); //$NON-NLS-1$
			if (id != null)
				action.setDisabledImageDescriptor(id);
		} catch (MalformedURLException e) {
		}
		ImageDescriptor descriptor = create("e" + type, relPath); //$NON-NLS-1$
		action.setHoverImageDescriptor(descriptor);
		action.setImageDescriptor(descriptor);
	}

	private static ImageDescriptor createManaged(String prefix, String name) {
		return createManaged(prefix, name, 0, null);
	}

	private static ImageDescriptor createManaged(String prefix, String name, int flags, Point size) {
		try {
			ImageDescriptor result = ImageDescriptor
					.createFromURL(makeIconFileURL(prefix, name.substring(NAME_PREFIX_LENGTH)));
			if (fgAvoidSWTErrorMap == null) {
				fgAvoidSWTErrorMap = new HashMap();
			}
			fgAvoidSWTErrorMap.put(name, result);
			if (fgImageRegistry != null) {
				Logger.log(Logger.ERROR, "Image registry already defined"); //$NON-NLS-1$
			}
			return result;
		} catch (MalformedURLException e) {
			return ImageDescriptor.getMissingImageDescriptor();
		}
	}

	private static ImageDescriptor create(String prefix, String name) {
		try {
			return ImageDescriptor.createFromURL(makeIconFileURL(prefix, name));
		} catch (MalformedURLException e) {
			return ImageDescriptor.getMissingImageDescriptor();
		}
	}

	private static URL makeIconFileURL(String prefix, String name) throws MalformedURLException {
		if (fgIconBaseURL == null)
			throw new MalformedURLException();

		StringBuilder buffer = new StringBuilder(prefix);
		buffer.append('/');
		buffer.append(name);
		return new URL(fgIconBaseURL, buffer.toString());
	}
}