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/*******************************************************************************
 * Copyright (c) 2000, 2012 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.cdt.debug.internal.ui.actions;

import org.eclipse.debug.core.DebugEvent;
import org.eclipse.debug.core.DebugPlugin;
import org.eclipse.debug.core.IDebugEventSetListener;
import org.eclipse.jface.action.IAction;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IViewActionDelegate;
import org.eclipse.ui.IViewPart;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.IWorkbenchWindowActionDelegate;

public abstract class AbstractListenerActionDelegate extends AbstractDebugActionDelegate
		implements IDebugEventSetListener {

	/**
	 * @see org.eclipse.ui.IWorkbenchWindowActionDelegate#dispose()
	 * @see org.eclipse.ui.IActionDelegate2#dispose()
	 */
	@Override
	public void dispose() {
		super.dispose();
		DebugPlugin.getDefault().removeDebugEventListener(this);
	}

	/**
	 * @see IDebugEventSetListener#handleDebugEvents(DebugEvent[])
	 */
	@Override
	public void handleDebugEvents(final DebugEvent[] events) {
		if (getWindow() == null || getAction() == null) {
			return;
		}
		Shell shell = getWindow().getShell();
		if (shell == null || shell.isDisposed()) {
			return;
		}
		Runnable r = () -> {
			for (int i = 0; i < events.length; i++) {
				if (events[i].getSource() != null) {
					doHandleDebugEvent(events[i]);
				}
			}
		};

		shell.getDisplay().asyncExec(r);
	}

	/**
	 * Default implementation to update on specific debug events.
	 * Subclasses should override to handle events differently.
	 */
	protected void doHandleDebugEvent(DebugEvent event) {
		switch (event.getKind()) {
		case DebugEvent.TERMINATE:
			update(getAction(), getSelection());
			break;
		case DebugEvent.RESUME:
			if (!event.isEvaluation() || !((event.getDetail() & DebugEvent.EVALUATION_IMPLICIT) != 0)) {
				update(getAction(), getSelection());
			}
			break;
		case DebugEvent.SUSPEND:
			// Update on suspend events (even for evaluations), in case the user changed
			// the selection during an implicit evaluation.
			update(getAction(), getSelection());
			break;
		}
	}

	/**
	 * @see IWorkbenchWindowActionDelegate#init(IWorkbenchWindow)
	 */
	@Override
	public void init(IWorkbenchWindow window) {
		super.init(window);
		DebugPlugin.getDefault().addDebugEventListener(this);
	}

	/**
	 * @see IViewActionDelegate#init(IViewPart)
	 */
	@Override
	public void init(IViewPart view) {
		super.init(view);
		DebugPlugin.getDefault().addDebugEventListener(this);
		setWindow(view.getViewSite().getWorkbenchWindow());
	}

	/**
	 * @see org.eclipse.ui.IActionDelegate2#init(org.eclipse.jface.action.IAction)
	 */
	@Override
	public void init(IAction action) {
	}

	/**
	 * @see org.eclipse.ui.IActionDelegate2#runWithEvent(org.eclipse.jface.action.IAction, org.eclipse.swt.widgets.Event)
	 */
	@Override
	public void runWithEvent(IAction action, Event event) {
		run(action);
	}
}

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