/*******************************************************************************
 * 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.update.internal.ui;

import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.update.internal.core.*;

/**
 * A dialog which prompts the user to restart after an update operation
 * and provides Yes, No, Continue buttons. 
 */
public class RestartDialog extends MessageDialog {
	private static final int CONTINUE = 2;
	private final static String[] yesNo = new String[] {IDialogConstants.YES_LABEL, IDialogConstants.NO_LABEL};
	private final static String[] yesNoApply = new String[] {IDialogConstants.YES_LABEL, IDialogConstants.NO_LABEL, UpdateUI.getString("ApplyChanges")};
	
	private int buttonId = 0;
	
	/**
	 * Creates a new dialog
	 * @see MessageDialog#MessageDialog(org.eclipse.swt.widgets.Shell, java.lang.String, org.eclipse.swt.graphics.Image, java.lang.String, int, java.lang.String[], int)
	 */
	public RestartDialog(Shell parent, String title, String message, boolean restartNeeded) {
		super(parent,
				title,
				null,	// accept the default window icon
				message,
				QUESTION,
				restartNeeded ? yesNo : yesNoApply, 
				0);		// yes is the default
	}

	/**
	 * Convenience method to open the Yes/No/Continue question dialog.
	 *
	 * @param parent the parent shell of the dialog, or <code>null</code> if none
	 * @param restartIsReallyNeeded when false, the changes are applied to the current config
	 * @return <code>true</code> if the user presses  YES
	 *    <code>false</code> otherwise
	 */
	public static boolean openQuestion(Shell parent, boolean restartIsReallyNeeded) {
		String title = UpdateUI.getString("RestartTitle"); //$NON-NLS-1$
		String message = restartIsReallyNeeded ? UpdateUI.getString("RestartMessage"): UpdateUI.getString("OptionalRestartMessage"); //$NON-NLS-1$
		RestartDialog dialog = new RestartDialog(parent, title,	message, restartIsReallyNeeded);
		int button= dialog.open();
		if (button == 2)
			InstallConfiguration.applyChanges();
		return button == 0; // Yes
	}
	
	/**
	 * When a button is pressed, store the preference.
	 * 
	 * @see org.eclipse.jface.dialogs.Dialog#buttonPressed(int)
	 */
	protected void buttonPressed(int id) {
		if (id == 2) { 
			buttonId= CONTINUE;
		} 
		
		super.buttonPressed(id);
	}
	
	/**
	 * Returns the user's selection,
	 * <code>null</code> if the user hasn't chosen yet.
	 * 
	 * @return the user's selection or <code>null</code>
	 */
	public int getResult() {
		return buttonId;
	}
}