/*******************************************************************************
 * 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.ui.internal.ide;

import java.util.ArrayList;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.help.IHelp;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.ErrorDialog;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.swt.custom.BusyIndicator;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.AboutInfo;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.WorkbenchException;
import org.eclipse.ui.actions.ActionFactory;
import org.eclipse.ui.actions.PartEventAction;
import org.eclipse.ui.help.WorkbenchHelp;

/**
 * Launch the tips and tricks action.
 */
public class TipsAndTricksAction
		extends PartEventAction
		implements ActionFactory.IWorkbenchAction {

	/**
	 * The workbench window this action is registered with.
	 */
	 private IWorkbenchWindow workbenchWindow;
	 
	/**
	 *	Create an instance of this class
	 */
	public TipsAndTricksAction(IWorkbenchWindow window) {
		super(IDEWorkbenchMessages.getString("TipsAndTricks.text")); //$NON-NLS-1$
		if (window == null) {
			throw new IllegalArgumentException();
		}
		this.workbenchWindow = window;
		setToolTipText(IDEWorkbenchMessages.getString("TipsAndTricks.toolTip")); //$NON-NLS-1$
		WorkbenchHelp.setHelp(this, IHelpContextIds.TIPS_AND_TRICKS_ACTION);
		setActionDefinitionId("org.eclipse.ui.help.tipsAndTricksAction"); //$NON-NLS-1$
		workbenchWindow.getPartService().addPartListener(this);
	}

	/**
	 *	The user has invoked this action
	 */
	public void run() {
		if (workbenchWindow == null) {
			// action has been disposed
			return;
		}
		// Ask the user to select a feature
		AboutInfo[] featureInfos = null;
		try {
			featureInfos = IDEApplication.getFeatureInfos();
		} catch (WorkbenchException e) {
			ErrorDialog.openError(
				workbenchWindow.getShell(), 
				IDEWorkbenchMessages.getString("TipsAndTricks.errorDialogTitle"),  //$NON-NLS-1$
				IDEWorkbenchMessages.getString("TipsAndTricks.infoReadError"),  //$NON-NLS-1$
				e.getStatus());
			return;
		}
		
		ArrayList tipsAndTricksFeatures = new ArrayList(featureInfos.length);
		for (int i = 0; i < featureInfos.length; i++) {
			if (featureInfos[i].getTipsAndTricksHref() != null)
				tipsAndTricksFeatures.add(featureInfos[i]);
		}

		Shell shell = workbenchWindow.getShell();

		if (tipsAndTricksFeatures.size() == 0) {
			MessageDialog.openInformation(
				shell, 
				IDEWorkbenchMessages.getString("TipsAndTricksMessageDialog.title"), //$NON-NLS-1$
				IDEWorkbenchMessages.getString("TipsAndTricksMessageDialog.message")); //$NON-NLS-1$
			return;
		}

		AboutInfo[] features = new AboutInfo[tipsAndTricksFeatures.size()];
		tipsAndTricksFeatures.toArray(features);

		AboutInfo primaryInfo = null;
		try {
			primaryInfo = IDEApplication.getPrimaryInfo();
		} catch (WorkbenchException e) {
			ErrorDialog.openError(
				workbenchWindow.getShell(), 
				IDEWorkbenchMessages.getString("TipsAndTricks.errorDialogTitle"),  //$NON-NLS-1$
				IDEWorkbenchMessages.getString("TipsAndTricks.infoReadError"),  //$NON-NLS-1$
				e.getStatus());
			return;
		}
		
		FeatureSelectionDialog d = new FeatureSelectionDialog(
			shell, 
			features, 
			primaryInfo, 
			"TipsAndTricksPageSelectionDialog.title", //$NON-NLS-1$
			"TipsAndTricksPageSelectionDialog.message", //$NON-NLS-1$
			IHelpContextIds.TIPS_AND_TRICKS_PAGE_SELECTION_DIALOG);

		if (d.open() != Dialog.OK || d.getResult().length != 1)
			return;

		AboutInfo feature = (AboutInfo) d.getResult()[0];

		/**
		 * Open the tips and trick help topic
		 */
		if (feature != null) {
			final String href = feature.getTipsAndTricksHref();
			if (href != null) {
				BusyIndicator.showWhile(shell.getDisplay(), new Runnable() {
					public void run() {
						final IHelp helpSupport = WorkbenchHelp.getHelpSupport();
						if (helpSupport != null) {
							helpSupport.displayHelpResource(href);
						}
					}
				});
			} else {
				IStatus status = new Status(IStatus.ERROR, IDEWorkbenchPlugin.IDE_WORKBENCH, 1, IDEWorkbenchMessages.getString("TipsAndTricksAction.hrefNotDefined"), null); //$NON-NLS-1$
				ErrorDialog.openError(
					shell, 
					IDEWorkbenchMessages.getString("TipsAndTricksErrorDialog.title"), //$NON-NLS-1$
					IDEWorkbenchMessages.getString("TipsAndTricksErrorDialog.noHref"), //$NON-NLS-1$
					status);
			}
		} else {
			IStatus status = new Status(IStatus.ERROR, IDEWorkbenchPlugin.IDE_WORKBENCH, 1, IDEWorkbenchMessages.getString("TipsAndTricksAction.hrefNotDefined"), null); //$NON-NLS-1$
			ErrorDialog.openError(
				shell, 
				IDEWorkbenchMessages.getString("TipsAndTricksErrorDialog.title"), //$NON-NLS-1$
				IDEWorkbenchMessages.getString("TipsAndTricksErrorDialog.noFeatures"), //$NON-NLS-1$
				status);
		}
	}

	/* (non-Javadoc)
	 * Method declared on ActionFactory.IWorkbenchAction.
	 */
	public void dispose() {
		if (workbenchWindow == null) {
			// action has already been disposed
			return;
		}
		workbenchWindow.getPartService().removePartListener(this);
		workbenchWindow = null;
	}
}