/*******************************************************************************
 * Copyright (c) 2004, 2008 Tasktop Technologies, Polarion Software and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Tasktop Technologies - initial API and implementation
 *     IBM Corporation - helper methods from 
 *       org.eclipse.wst.common.frameworks.internal.ui.WTPActivityHelper 
 *******************************************************************************/

package org.eclipse.team.svn.ui.discovery;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.Calendar;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.swt.SWT;
import org.eclipse.team.svn.core.SVNTeamPlugin;
import org.eclipse.team.svn.core.operation.LoggedOperation;
import org.eclipse.team.svn.ui.SVNUIMessages;
import org.eclipse.team.svn.ui.utility.UIMonitorUtility;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.browser.IWebBrowser;
import org.eclipse.ui.browser.IWorkbenchBrowserSupport;
import org.eclipse.ui.internal.browser.WebBrowserPreference;
import org.eclipse.ui.internal.browser.WorkbenchBrowserSupport;

/**
 * @author Mik Kersten
 * @author Steffen Pingel
 * @author Igor Burilo
 */
public class WorkbenchUtil {	

	/**
	 * Opens <code>location</code> in a web-browser according to the Eclipse workbench preferences.
	 * 
	 * @param location
	 *            the url to open
	 * @see #openUrl(String, int)
	 */
	public static void openUrl(String location) {
		openUrl(location, SWT.NONE);
	}

	/**
	 * Opens <code>location</code> in a web-browser according to the Eclipse workbench preferences.
	 * 
	 * @param location
	 *            the url to open
	 * @param customFlags
	 *            additional flags that are passed to {@link IWorkbenchBrowserSupport}, pass
	 *            {@link IWorkbenchBrowserSupport#AS_EXTERNAL} to force opening external browser
	 */
	public static void openUrl(String location, int customFlags) {
		try {
			URL url = null;
			if (location != null) {
				url = new URL(location);
			}
			if (WebBrowserPreference.getBrowserChoice() == WebBrowserPreference.EXTERNAL
					|| (customFlags & IWorkbenchBrowserSupport.AS_EXTERNAL) != 0) {
				try {
					IWorkbenchBrowserSupport support = PlatformUI.getWorkbench().getBrowserSupport();
					support.getExternalBrowser().openURL(url);
				} catch (PartInitException e) {
					Status status = new Status(IStatus.ERROR, SVNTeamPlugin.NATURE_ID,
							SVNUIMessages.WorkbenchUtil_Browser_Initialization_Failed);
					MessageDialog.openError(UIMonitorUtility.getShell(), SVNUIMessages.WorkbenchUtil_Open_Location_Title, status.getMessage());
				}
			} else {
				IWebBrowser browser = null;
				int flags = customFlags;
				if (WorkbenchBrowserSupport.getInstance().isInternalWebBrowserAvailable()) {
					flags |= IWorkbenchBrowserSupport.AS_EDITOR | IWorkbenchBrowserSupport.LOCATION_BAR
							| IWorkbenchBrowserSupport.NAVIGATION_BAR;
				} else {
					flags |= IWorkbenchBrowserSupport.AS_EXTERNAL | IWorkbenchBrowserSupport.LOCATION_BAR
							| IWorkbenchBrowserSupport.NAVIGATION_BAR;
				}

				String generatedId = "org.eclipse.team.svn.ui.web.browser-" + Calendar.getInstance().getTimeInMillis(); //$NON-NLS-1$
				browser = WorkbenchBrowserSupport.getInstance().createBrowser(flags, generatedId, null, null);
				browser.openURL(url);
			}
		} catch (PartInitException e) {
			LoggedOperation.reportError(WorkbenchUtil.class.toString(), e);			
			
			Status status = new Status(IStatus.ERROR, SVNTeamPlugin.NATURE_ID,
					SVNUIMessages.WorkbenchUtil_Browser_Initialization_Failed, e);
			MessageDialog.openError(UIMonitorUtility.getShell(), SVNUIMessages.WorkbenchUtil_Open_Location_Title, status.getMessage());			
		} catch (MalformedURLException e) {
			if (location != null && location.trim().equals("")) { //$NON-NLS-1$
				Status status = new Status(IStatus.WARNING, SVNTeamPlugin.NATURE_ID,
						SVNUIMessages.WorkbenchUtil_No_URL_Error, e);
				MessageDialog.openWarning(UIMonitorUtility.getShell(), SVNUIMessages.WorkbenchUtil_Open_Location_Title, status.getMessage());
			} else {
				Status status = new Status(IStatus.ERROR, SVNTeamPlugin.NATURE_ID, SVNUIMessages.format(
						SVNUIMessages.WorkbenchUtil_Invalid_URL_Error, location), e);
				MessageDialog.openError(UIMonitorUtility.getShell(), SVNUIMessages.WorkbenchUtil_Open_Location_Title, status.getMessage());
			}
		}
	}

}