/*******************************************************************************
 * Copyright (c) 2000, 2013 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.ant.tests.ui.editor.performance;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.jobs.IJobManager;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.jface.text.IDocument;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.ide.IDE;
import org.eclipse.ui.texteditor.IDocumentProvider;
import org.eclipse.ui.texteditor.ITextEditor;

/**
 * @since 3.1
 */
public class EditorTestHelper {

	public static IEditorPart openInEditor(IFile file, boolean runEventLoop) throws PartInitException {
		IEditorPart part = IDE.openEditor(getActivePage(), file);
		if (runEventLoop)
			runEventQueue(part);
		return part;
	}

	public static IEditorPart openInEditor(IFile file, String editorId, boolean runEventLoop) throws PartInitException {
		IEditorPart part = IDE.openEditor(getActivePage(), file, editorId);
		if (runEventLoop)
			runEventQueue(part);
		return part;
	}

	public static IDocument getDocument(ITextEditor editor) {
		IDocumentProvider provider = editor.getDocumentProvider();
		IEditorInput input = editor.getEditorInput();
		return provider.getDocument(input);
	}

	public static void revertEditor(ITextEditor editor, boolean runEventQueue) {
		editor.doRevertToSaved();
		if (runEventQueue)
			runEventQueue(editor);
	}

	public static void closeAllEditors() {
		IWorkbenchPage page = getActivePage();
		if (page != null)
			page.closeAllEditors(false);
	}

	public static void runEventQueue() {
		IWorkbenchWindow window = getActiveWorkbenchWindow();
		if (window != null)
			runEventQueue(window.getShell());
	}

	public static void runEventQueue(IWorkbenchPart part) {
		runEventQueue(part.getSite().getShell());
	}

	public static void runEventQueue(Shell shell) {
		while (shell.getDisplay().readAndDispatch()) {
			// XXX do nothing, just spin the loop
		}
	}

	public static void runEventQueue(long minTime) {
		long nextCheck = System.currentTimeMillis() + minTime;
		while (System.currentTimeMillis() < nextCheck) {
			runEventQueue();
			sleep(1);
		}
	}

	public static IWorkbenchWindow getActiveWorkbenchWindow() {
		return PlatformUI.getWorkbench().getActiveWorkbenchWindow();
	}

	public static IWorkbenchPage getActivePage() {
		IWorkbenchWindow window = getActiveWorkbenchWindow();
		return window != null ? window.getActivePage() : null;
	}

	public static Display getActiveDisplay() {
		IWorkbenchWindow window = getActiveWorkbenchWindow();
		return window != null ? window.getShell().getDisplay() : null;
	}

	public static boolean calmDown(long minTime, long maxTime, long intervalTime) {
		long startTime = System.currentTimeMillis() + minTime;
		runEventQueue();
		while (System.currentTimeMillis() < startTime)
			runEventQueue(intervalTime);

		long endTime = maxTime > 0 ? System.currentTimeMillis() + maxTime : Long.MAX_VALUE;
		boolean calm = isCalm();
		while (!calm && System.currentTimeMillis() < endTime) {
			runEventQueue(intervalTime);
			calm = isCalm();
		}
		// System.out.println("--------------------------------------------------");
		return calm;
	}

	public static void sleep(int intervalTime) {
		try {
			Thread.sleep(intervalTime);
		}
		catch (InterruptedException e) {
			e.printStackTrace();
		}
	}

	public static boolean isCalm() {
		IJobManager jobManager = Job.getJobManager();
		Job[] jobs = jobManager.find(null);
		for (int i = 0; i < jobs.length; i++) {
			Job job = jobs[i];
			int state = job.getState();
			// System.out.println(job.getName() + ": " + getStateName(state));
			if (state == Job.RUNNING || state == Job.WAITING) {
				// System.out.println();
				return false;
			}
		}
		// System.out.println();
		return true;
	}

	public static void bringToTop() {
		getActiveWorkbenchWindow().getShell().forceActive();
	}
}