/*******************************************************************************
 * Copyright (c) 2004, 2005 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ui.tests.session;

import junit.framework.TestCase;

import org.eclipse.ui.IPerspectiveDescriptor;
import org.eclipse.ui.IViewPart;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.internal.ViewSite;
import org.eclipse.ui.internal.ViewStack;
import org.eclipse.ui.internal.presentations.PresentablePart;
import org.eclipse.ui.internal.presentations.util.TabbedStackPresentation;
import org.eclipse.ui.presentations.IPresentablePart;

/**
 * Bug 108033 Need a test to ensure that view tab order is the same on start up
 * as it was in the last session.
 * 
 * These tests more or less depend on being run in order. The workspace exists
 * from method to method.
 * 
 * @since 3.2
 * 
 */
public class Bug108033Test extends TestCase {

	public static final String PROBLEM_VIEW_ID = "org.eclipse.ui.views.ProblemView";

	public static final String TASK_VIEW_ID = "org.eclipse.ui.views.TaskList";

	public static final String PROGRESS_VIEW_ID = "org.eclipse.ui.views.ProgressView";

	private static String RESOURCE_ID = "org.eclipse.ui.resourcePerspective";

	private IWorkbenchWindow fWin;

	private IWorkbenchPage fActivePage;

	private IWorkbench fWorkbench;

	public Bug108033Test(String testName) {
		super(testName);
	}

	protected void setUp() throws Exception {
		fWorkbench = PlatformUI.getWorkbench();

		fWin = fWorkbench.getActiveWorkbenchWindow();

		fActivePage = fWin.getActivePage();
	}

	/**
	 * Make sure the perspective has been reset, and then show the views in the
	 * expected order. These tests depend on being run in order in the same
	 * environment, so we can't use the standard openWindow() to protect
	 * ourselves from side effects.
	 * 
	 * @throws Throwable
	 *             an error
	 */
	public void testShowMultipleViews() throws Throwable {
		IPerspectiveDescriptor desc = fActivePage.getWorkbenchWindow()
				.getWorkbench().getPerspectiveRegistry().findPerspectiveWithId(
						RESOURCE_ID);
		fActivePage.setPerspective(desc);
		fActivePage.resetPerspective();
		assertNotNull(fActivePage.showView(TASK_VIEW_ID));
		assertNotNull(fActivePage.showView(PROGRESS_VIEW_ID));
		assertNotNull(fActivePage.showView(PROBLEM_VIEW_ID));
	}

	/**
	 * Check the views are still in the correct order, then move the problems
	 * view to the first tab.
	 * 
	 * @throws Throwable
	 *             an error
	 */
	public void testCheckMultipleViews() throws Throwable {
		IViewPart problemView = instantiateViews();

		ViewSite site = (ViewSite) problemView.getSite();
		ViewStack stack = (ViewStack) site.getPane().getContainer();

		TabbedStackPresentation pres = (TabbedStackPresentation) stack
				.getTestPresentation();

		verifyOrder(pres, new String[] { "Tasks", "Progress", "Problems" });
		IPresentablePart part = getPresentablePart(site);
		assertNotNull(part);

		pres.moveTab(part, 0);

		verifyOrder(pres, new String[] { "Problems", "Tasks", "Progress" });
	}

	/**
	 * Verify the views are ordered with the problems view first after the
	 * restart.
	 * 
	 * @throws Throwable
	 *             an error
	 */
	public void testMovedMultipleViews() throws Throwable {
		IViewPart problemView = instantiateViews();

		ViewSite site = (ViewSite) problemView.getSite();
		ViewStack stack = (ViewStack) site.getPane().getContainer();

		TabbedStackPresentation pres = (TabbedStackPresentation) stack
				.getTestPresentation();

		verifyOrder(pres, new String[] { "Problems", "Tasks", "Progress" });
	}

	/**
	 * Removes any NPEs.
	 * 
	 * @return the problem view.
	 * @throws PartInitException
	 *             if a view fails to instantiate.
	 */
	private IViewPart instantiateViews() throws PartInitException {
		IViewPart problemView = fActivePage.showView(PROBLEM_VIEW_ID);
		assertNotNull(problemView);

		// make sure all of the views have been instantiated
		assertNotNull(fActivePage.showView(PROGRESS_VIEW_ID));
		assertNotNull(fActivePage.showView(TASK_VIEW_ID));
		return problemView;
	}

	/**
	 * Verify the tabs are in the correct order.
	 * 
	 * @param pres
	 *            the stack presentation
	 * @param order
	 *            the expected order
	 */
	private void verifyOrder(TabbedStackPresentation pres, String[] order) {
		IPresentablePart[] tabs = pres.getPartList();
		assertEquals("Different number of tabs", order.length, tabs.length);
		for (int i = 0; i < tabs.length; ++i) {
			assertEquals("Failed on tab " + i, order[i], tabs[i].getName());
		}
	}

	/**
	 * Get the presentable part for the view (view site).
	 * 
	 * @param site
	 *            the site of the view we want
	 * @return it's presentable part.
	 */
	private IPresentablePart getPresentablePart(ViewSite site) {
		IPresentablePart[] partList = (IPresentablePart[]) ((ViewStack) site
				.getPane().getContainer()).getPresentableParts().toArray(
				new IPresentablePart[0]);
		for (int i = 0; i < partList.length; i++) {
			IPresentablePart part = partList[i];
			if (((PresentablePart) part).getPane() == site.getPane()) {
				return part;
			}
		}
		return null;
	}
}