/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.debug.internal.ui.actions;


import java.util.ArrayList;
import java.util.List;

import org.eclipse.debug.core.DebugEvent;
import org.eclipse.debug.core.DebugPlugin;
import org.eclipse.debug.core.ILaunch;
import org.eclipse.debug.core.ILaunchManager;
import org.eclipse.debug.core.ILaunchesListener;
import org.eclipse.debug.core.model.IDebugTarget;
import org.eclipse.debug.core.model.IProcess;
import org.eclipse.debug.ui.IDebugView;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.StructuredViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.ui.IViewPart;
 
/**
 * Removes all terminated/detached launches from the
 * active debug view.
 */
public class RemoveAllTerminatedAction extends AbstractRemoveAllActionDelegate implements ILaunchesListener {

	/**
	 * @see ListenerActionDelegate#doHandleDebugEvent(DebugEvent)
	 */	
	protected void doHandleDebugEvent(DebugEvent event) {	
		if (event.getKind() == DebugEvent.TERMINATE) {
			Object source= event.getSource();
			if (source instanceof IDebugTarget) {
				ILaunch launch= ((IDebugTarget)source).getLaunch();
				if (launch.isTerminated() && launchIsRegistered(launch)) {
					getAction().setEnabled(true);
				}
			} else if (source instanceof IProcess) {
				ILaunch launch= ((IProcess)source).getLaunch();
				if (launch.isTerminated() && launchIsRegistered(launch)) {
					getAction().setEnabled(true);
				}
			}
		}
	}

	private boolean launchIsRegistered(ILaunch iLaunch) {
		ILaunch[] launches= DebugPlugin.getDefault().getLaunchManager().getLaunches();
		for (int i = 0; i < launches.length; i++) {
			ILaunch launch = launches[i];
			if (launch.equals(iLaunch)) {
				return true;
			}
		}
		return false;
	}

	/** 
	 * Updates the enabled state of this action to enabled if at
	 * least one launch is terminated and relative to the current perspective.
	 */
	protected void update() {
		Object[] elements = getElements();
		if (elements != null) {
			for (int i= 0; i < elements.length; i++) {
				if (elements[i] instanceof ILaunch) {
					ILaunch launch= (ILaunch)elements[i];
					if (launch.isTerminated()) {
						getAction().setEnabled(true);
						return;
					}
				}
			}
		}
		getAction().setEnabled(false);
	}

	protected void doAction() {
		Object[] elements = getElements();
		removeTerminatedLaunches(elements);
	}
	
	/**
	 * Returns the top level elements in the active debug
	 * view, or <code>null</code> if none.
	 * 
	 * @return array of object
	 */
	public Object[] getElements() {
		IDebugView view = getDebugView();
		if (view != null) {
			Viewer viewer = view.getViewer();
			if (viewer instanceof StructuredViewer) {
				IStructuredContentProvider cp = (IStructuredContentProvider)((StructuredViewer)viewer).getContentProvider();
				Object input = viewer.getInput();
				return cp.getElements(input);
			}
		}
		return null;
	}

	public static void removeTerminatedLaunches(Object[] elements) {
		List removed = new ArrayList();
		for (int i = 0; i < elements.length; i++) {
			if (elements[i] instanceof ILaunch) {
				ILaunch launch = (ILaunch)elements[i];
				if (launch.isTerminated()) {
					removed.add(launch);
				}
			}
		}
		if (!removed.isEmpty()) {
			ILaunchManager manager = DebugPlugin.getDefault().getLaunchManager();
			manager.removeLaunches((ILaunch[])removed.toArray(new ILaunch[removed.size()]));
		}				
	}
	
	protected IDebugView getDebugView() {
		return (IDebugView)getView().getAdapter(IDebugView.class);
	}

	/**
	 * @see IViewActionDelegate#init(IViewPart)
	 */
	public void init(IViewPart view) {
		super.init(view);
		DebugPlugin.getDefault().getLaunchManager().addLaunchListener(this);
		DebugPlugin.getDefault().addDebugEventListener(this);
	}
		
	/**
	 * @see IWorkbenchWindowActionDelegate#dispose()
	 */
	public void dispose() {
		//removes as a debug event listener
		super.dispose();
		DebugPlugin.getDefault().getLaunchManager().removeLaunchListener(this);
	}
	
	/**
	 * @see ILaunchesListener#launchesAdded(ILaunch[])
	 */
	public void launchesAdded(ILaunch[] launches) {
	}

	/**
	 * @see ILaunchesListener#launchesChanged(ILaunch[])
	 */
	public void launchesChanged(ILaunch[] launches) {
	}

	/**
	 * @see ILaunchesListener#launchesRemoved(ILaunch[])
	 */
	public void launchesRemoved(ILaunch[] launches) {
		if (getAction().isEnabled()) {
			update();
		}
	}
}