/*******************************************************************************
 * Copyright (c) 2004, 2005 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
 *     Jens Lukowski/Innoopract - initial renaming/restructuring
 *******************************************************************************/
package org.eclipse.wst.common.ui.internal;

import java.net.MalformedURLException;
import java.net.URL;
import java.text.MessageFormat;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

import org.eclipse.core.resources.IWorkspace;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.ImageRegistry;
import org.eclipse.swt.graphics.Image;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.osgi.framework.BundleContext;

/**
 * The main plugin class to be used in the desktop.
 */
public class UIPlugin extends AbstractUIPlugin {
	//The shared instance.
	private static UIPlugin plugin;
	
	/**
	 * The constructor.
	 */
	public UIPlugin() {
		super();
		plugin = this;
	}
	
	/**
	 * Returns the shared instance.
	 */
	public static UIPlugin getDefault() {
		return plugin;
	}

	/**
	 * Returns the workspace instance.
	 */
	public static IWorkspace getWorkspace() {
		return ResourcesPlugin.getWorkspace();
	}

	/**
	 * Returns the string from the plugin's resource bundle,
	 * or 'key' if not found.
	 */
	public static String getResourceString(String key) {
		ResourceBundle aResourceBundle = getDefault().getResourceBundle();
		try {
			return (aResourceBundle != null) ? aResourceBundle.getString(key) : key;
		} catch (MissingResourceException e) {
			return key;
		}
	}
	
	/**
	 * This gets the string resource and does one substitution.
	 */
	public static String getString(String key, Object s1)
	{
	  return MessageFormat.format(getResourceString(key), new Object [] { s1 });
	}

	/**
	 * This gets the string resource and does two substitutions.
	 */
	public static String getString(String key, Object s1, Object s2)
	{
	  return MessageFormat.format(getResourceString(key), new Object [] { s1, s2 });
	}     
	
	/**
	 * Returns the plugin's resource bundle,
	 */
	public ResourceBundle getResourceBundle() {
		try {
			return Platform.getResourceBundle(plugin.getBundle());
		} catch (MissingResourceException x) {
			log(x);
		}
		return null;
	}

	public ImageDescriptor getImageDescriptor(String name) {
		try {
			URL url= new URL(getBundle().getEntry("/"), name);
			return ImageDescriptor.createFromURL(url);
		} catch (MalformedURLException e) {
			return ImageDescriptor.getMissingImageDescriptor();
		}
	}
	
    public Image getImage(String iconName)
    {
      ImageRegistry imageRegistry = getImageRegistry();
      
      if (imageRegistry.get(iconName) != null)
      {
        return imageRegistry.get(iconName);
      }
      else
      {
        imageRegistry.put(iconName, ImageDescriptor.createFromFile(getClass(), iconName));
        return imageRegistry.get(iconName);
      }
    }
    
    public static String getPluginId() {
		return getDefault().getBundle().getSymbolicName();
	}	

	public static void log(IStatus status) {
		getDefault().getLog().log(status);
	}

	public static void log(String message, Throwable e) {
		log(new Status(IStatus.ERROR, getPluginId(), IStatus.ERROR, message, e));
	}
	
	public static void log(String message) {
		log(new Status(IStatus.ERROR, getPluginId(), IStatus.ERROR, message, null));
	}

	public static void log(Throwable e) {
		log(new Status(IStatus.ERROR, getPluginId(), IStatus.ERROR, e.getLocalizedMessage(), e));
	}
	/* (non-Javadoc)
	 * @see org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext)
	 */
	public void start(BundleContext context) throws Exception {
		// TODO Auto-generated method stub
		super.start(context);
	}
	/* (non-Javadoc)
	 * @see org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext)
	 */
	public void stop(BundleContext context) throws Exception {
		// TODO Auto-generated method stub
		super.stop(context);
	}
    
    public static IWorkbenchPage getActivePage() {
        return getDefault().internalGetActivePage();
    }
    
    private IWorkbenchPage internalGetActivePage() {
        IWorkbenchWindow window= getWorkbench().getActiveWorkbenchWindow();
        if (window == null)
            return null;
        return getWorkbench().getActiveWorkbenchWindow().getActivePage();
    }    
}