/*******************************************************************************
 * Copyright (c) 2011, 2018 Wind River Systems, Inc. and others. All rights reserved.
 * 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:
 * Wind River Systems - initial API and implementation
 *******************************************************************************/
package org.eclipse.tm.terminal.view.ui.tabs;

import org.eclipse.core.runtime.Assert;
import org.eclipse.swt.custom.CTabItem;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.widgets.Control;
import org.eclipse.tm.internal.terminal.control.ITerminalViewControl;
import org.eclipse.tm.terminal.view.core.TerminalServiceFactory;
import org.eclipse.tm.terminal.view.core.interfaces.ITerminalService;
import org.eclipse.tm.terminal.view.ui.services.TerminalService;

/**
 * Terminal tab default dispose listener implementation.
 */
public class TabDisposeListener implements DisposeListener {
	private final TabFolderManager parentTabFolderManager;

	/**
	 * Constructor.
	 *
	 * @param parentTabFolderManager The parent tab folder manager. Must not be <code>null</code>
	 */
	public TabDisposeListener(TabFolderManager parentTabFolderManager) {
		Assert.isNotNull(parentTabFolderManager);
		this.parentTabFolderManager = parentTabFolderManager;
	}

	/**
	 * Returns the parent terminal console tab folder manager instance.
	 *
	 * @return The parent terminal console tab folder manager instance.
	 */
	protected final TabFolderManager getParentTabFolderManager() {
		return parentTabFolderManager;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.swt.events.DisposeListener#widgetDisposed(org.eclipse.swt.events.DisposeEvent)
	 */
	@Override
	public void widgetDisposed(DisposeEvent e) {
		// If a tab item gets disposed, we have to dispose the terminal as well
		if (e.getSource() instanceof CTabItem) {
			// Get the terminal control (if any) from the tab item
			Object candidate = ((CTabItem)e.getSource()).getData();
			if (candidate instanceof ITerminalViewControl) {
				ITerminalViewControl terminal = (ITerminalViewControl)candidate;
				// Keep the context menu from being disposed
				terminal.getControl().setMenu(null);
				terminal.disposeTerminal();
			}
			// Dispose the command input field handler
			parentTabFolderManager.disposeTabCommandFieldHandler((CTabItem)e.getSource());
			// Dispose the tab item control
			Control control = ((CTabItem) e.getSource()).getControl();
			if (control != null) control.dispose();

			// If all items got removed, we have to switch back to the empty page control
			if (parentTabFolderManager.getTabFolder() != null && parentTabFolderManager.getTabFolder().getItemCount() == 0) {
				parentTabFolderManager.getParentView().switchToEmptyPageControl();
			}
			// Fire selection changed event
			parentTabFolderManager.fireSelectionChanged();
			// Fire the terminal console disposed event
			ITerminalService service = TerminalServiceFactory.getService();
			if (service instanceof TerminalService) {
				((TerminalService)service).fireTerminalTabEvent(TerminalService.TAB_DISPOSED, e.getSource(), ((CTabItem)e.getSource()).getData("customData")); //$NON-NLS-1$
			}
		}
	}
}