/*

* Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:

*

*/

package com.nokia.testfw.resultview;

import org.eclipse.core.resources.IContainer;

import org.eclipse.core.resources.IFile;

import org.eclipse.core.resources.IProject;

import org.eclipse.core.resources.IResource;

import org.eclipse.core.resources.ResourcesPlugin;

import org.eclipse.core.runtime.CoreException;

import org.eclipse.core.runtime.IStatus;

import org.eclipse.jface.text.BadLocationException;

import org.eclipse.jface.text.IDocument;

import org.eclipse.jface.text.IRegion;

import org.eclipse.ui.IEditorInput;

import org.eclipse.ui.IEditorPart;

import org.eclipse.ui.IWorkbenchPage;

import org.eclipse.ui.PlatformUI;

import org.eclipse.ui.ide.IDE;

import org.eclipse.ui.texteditor.IDocumentProvider;

import org.eclipse.ui.texteditor.ITextEditor;

/**

 * @author xiaoma

 *

 */

public class WorkspaceUtils {

	/**

	 * open specified file in associate editor, move cursor to the right position

	 * @return true, the file opened successfully

	 */

	public static boolean openFile(String fileName, int line, int column) {

		//find file in workspace

		IFile file = findFileByName(fileName);

		if (file == null) {

			ResultViewPlugin.log(IStatus.WARNING, "can't find file to open:" + fileName);

			return false;

		}

		try {

//			//open editor

			IWorkbenchPage page =

				 PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();

			IEditorPart part = IDE.openEditor(page, file, true);

			selectLine(part, line);

			//todo: find a way to locate line and column

//			   HashMap map = new HashMap();

//			   map.put(IMarker.LINE_NUMBER, new Integer(line));

//			   IMarker marker = file.createMarker(IMarker.TEXT);

//			   marker.setAttributes(map);

//			   marker.delete();

		} catch (Exception e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		}

		return false;

	}

	private static void selectLine(IEditorPart editorPart, int lineNumber) {

		if (lineNumber > 0 && editorPart instanceof ITextEditor) {

			ITextEditor textEditor = (ITextEditor)editorPart;

			IEditorInput input = editorPart.getEditorInput();

			int offset = 0;

			int length = 0;

			IDocumentProvider provider = textEditor.getDocumentProvider();

			try {

				provider.connect(input);

			} catch (CoreException e) {

				// unable to link

				e.printStackTrace();

				return;

			}

			IDocument document = provider.getDocument(input);

			try {

				IRegion region= document.getLineInformation(lineNumber - 1);

				offset = region.getOffset();

				length = region.getLength();

			} catch (BadLocationException e) {

				// unable to link

				e.printStackTrace();

			}

			provider.disconnect(input);

			if (offset >= 0 && length >=0) {

				textEditor.selectAndReveal(offset, length);

			}

		}

	}

	/**

	 * find flie by name. 

	 * this will loop up all files in workspace opened project and return the first matched

	 * file

	 * @return the file or null

	 */

	private static IFile findFileByName(String fileName) {

		IProject[] projects =

			ResourcesPlugin.getWorkspace().getRoot().getProjects();

		for (IProject project : projects) {

			if (!project.isOpen()) {

				continue;

			}

			IFile file = findFileByName(project, fileName);

			if (file != null) {

				return file;

			}

		}

		return null;

	}

	private static IFile findFileByName(IContainer container, String fileName) {

		IResource file = null;

		file = container.findMember(fileName);

		if (file != null && file instanceof IFile) {

			return (IFile)file;

		}

		try {

			for (IResource res:container.members()) {

				if (res instanceof IContainer) {

					file = findFileByName((IContainer)res, fileName);

					if (file != null) {

						return (IFile)file;

					}

				}

			}

		} catch (CoreException e) {

			e.printStackTrace();

			return null;

		}

		return null;

	}

}