/*
    * Copyright (C) 2007-2012 Argeo GmbH
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *         http://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.argeo.cms.e4.monitoring;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import javax.annotation.PostConstruct;
  
  import org.argeo.eclipse.ui.TreeParent;
  import org.eclipse.e4.ui.di.Focus;
  import org.eclipse.jface.viewers.ITreeContentProvider;
  import org.eclipse.jface.viewers.TreeViewer;
  import org.eclipse.jface.viewers.Viewer;
  import org.eclipse.swt.SWT;
  import org.eclipse.swt.widgets.Composite;
  import org.osgi.framework.Bundle;
  import org.osgi.framework.BundleContext;
  import org.osgi.framework.FrameworkUtil;
  
  /** The OSGi runtime from a module perspective. */
  public class ModulesView {
  	private final static BundleContext bc = FrameworkUtil.getBundle(ModulesView.class).getBundleContext();
  	private TreeViewer viewer;
  
  	@PostConstruct
  	public void createPartControl(Composite parent) {
  		viewer = new TreeViewer(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL);
  		viewer.setContentProvider(new ModulesContentProvider());
  		viewer.setLabelProvider(new ModulesLabelProvider());
  		viewer.setInput(bc);
  	}
  
  	@Focus
  	public void setFocus() {
  		viewer.getTree().setFocus();
  	}
  
  	private class ModulesContentProvider implements ITreeContentProvider {
  		private static final long serialVersionUID = 3819934804640641721L;
  
  		public Object[] getElements(Object inputElement) {
  			return getChildren(inputElement);
  		}
  
  		public Object[] getChildren(Object parentElement) {
  			if (parentElement instanceof BundleContext) {
  				BundleContext bundleContext = (BundleContext) parentElement;
  				Bundle[] bundles = bundleContext.getBundles();
  
  				List<BundleNode> modules = new ArrayList<BundleNode>();
  				for (Bundle bundle : bundles) {
  					if (bundle.getState() == Bundle.ACTIVE)
  						modules.add(new BundleNode(bundle, true));
  				}
  				return modules.toArray();
  			} else if (parentElement instanceof TreeParent) {
  				return ((TreeParent) parentElement).getChildren();
  			} else {
  				return null;
  			}
  		}
  
  		public Object getParent(Object element) {
  			// TODO Auto-generated method stub
  			return null;
  		}
  
  		public boolean hasChildren(Object element) {
  			if (element instanceof TreeParent) {
  				return ((TreeParent) element).hasChildren();
  			}
  			return false;
  		}
  
  		public void dispose() {
  		}
  
  		public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
  		}
  	}
  
  	private class ModulesLabelProvider extends StateLabelProvider {
  		private static final long serialVersionUID = 5290046145534824722L;
  
  		@Override
 		public String getText(Object element) {
 			if (element instanceof BundleNode)
 				return element.toString() + " [" + ((BundleNode) element).getBundle().getBundleId() + "]";
 			return element.toString();
 		}
 	}
 }