//------------------------------------------------------------------------------
// Copyright (c) 2005, 2006 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 implementation
//------------------------------------------------------------------------------
package org.eclipse.epf.importing.xml.wizards;

import java.io.File;
import java.lang.reflect.InvocationTargetException;

import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.epf.authoring.ui.wizards.SaveAllEditorsPage;
import org.eclipse.epf.common.ui.util.MsgBox;
import org.eclipse.epf.export.xml.ExportXMLPlugin;
import org.eclipse.epf.importing.xml.ImportXMLPlugin;
import org.eclipse.epf.importing.xml.ImportXMLResources;
import org.eclipse.epf.importing.xml.preferences.ImportXMLPreferences;
import org.eclipse.epf.importing.xml.services.ImportXMLService;
import org.eclipse.epf.library.ILibraryManager;
import org.eclipse.epf.library.LibraryService;
import org.eclipse.epf.library.ui.actions.LibraryLockingOperationRunner;
import org.eclipse.epf.library.ui.wizards.LibraryBackupUtil;
import org.eclipse.epf.library.util.ResourceUtil;
import org.eclipse.epf.persistence.MultiFileSaveUtil;
import org.eclipse.epf.persistence.refresh.RefreshJob;
import org.eclipse.epf.services.IFileManager;
import org.eclipse.epf.services.Services;
import org.eclipse.jface.operation.IRunnableWithProgress;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.wizard.Wizard;
import org.eclipse.osgi.util.NLS;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.IImportWizard;
import org.eclipse.ui.IWorkbench;

/**
 * The Import XML wizard.
 * <p>
 * This wizard is used to import method library content stored in a XML file.
 * 
 * @author Jinhua Xi
 * @author Kelvin Low
 * @since 1.0
 */
public class ImportXMLWizard extends Wizard implements IImportWizard {

	ImportXMLService service = new ImportXMLService();

	private boolean succeed = true;
	
	private SelectXMLFilePage filePage = null;

	/**
	 * Creates a new instance.
	 */
	public ImportXMLWizard() {
		super();
		setWindowTitle(ImportXMLResources.importXMLWizard_title);
		setNeedsProgressMonitor(true);
	}

	/**
	 * @see org.eclipse.ui.IWorkbenchWizard#init(IWorkbench,
	 *      IStructuredSelection)
	 */
	public void init(IWorkbench workbench, IStructuredSelection selection) {
	}

	/**
	 * @see org.eclipse.jface.wizard.Wizard#addPages()
	 */
	public void addPages() {
		// check out the library first
		IFileManager fileMgr = Services.getFileManager();
		if (LibraryService.getInstance()
				.getCurrentMethodLibrary() != null) {
			fileMgr.checkModify(LibraryService.getInstance()
					.getCurrentMethodLibrary().eResource().getURI().toFileString(),
					MsgBox.getDefaultShell());
		}

		ILibraryManager manager = (ILibraryManager) LibraryService
				.getInstance().getCurrentLibraryManager();
		if (manager != null && manager.isMethodLibraryReadOnly()) {
			File libraryFile = new File(LibraryService.getInstance()
					.getCurrentMethodLibraryLocation(),
					MultiFileSaveUtil.DEFAULT_LIBRARY_MODEL_FILENAME);
			ImportXMLPlugin.getDefault().getMsgDialog().displayError(
					ImportXMLResources.importXMLWizard_title,
					ImportXMLResources.importXMLError_msg,
					NLS.bind(ImportXMLResources.importXMLError_reason,
							libraryFile.getAbsolutePath()));
			return;
		}

		SaveAllEditorsPage.addPageIfNeeded(this, true, null, null, ImportXMLPlugin
				.getDefault().getImageDescriptor(
						"full/wizban/ImportXML.gif")); //$NON-NLS-1$
		
		filePage = new SelectXMLFilePage();
		addPage(filePage);
	}

	/**
	 * @see org.eclipse.jface.wizard.Wizard#createPageControls(Composite)
	 */
	public void createPageControls(Composite pageContainer) {
		super.createPageControls(pageContainer);
		pageContainer.getShell().setImage(
				ExportXMLPlugin.getDefault().getSharedImage(
						"full/obj16/XMLFile.gif")); //$NON-NLS-1$
	}

	/**
	 * @see org.eclipse.jface.wizard.IWizard#performFinish()
	 */
	public boolean performFinish() {
		boolean refresh = RefreshJob.getInstance().isEnabled();
		if (refresh) {
			//Needed: because LibraryLockingOperationRunner adds events to RefreshJob at the
			//end of "run" call!
			RefreshJob.getInstance().setEnabled(false);
		}		
		final boolean ret[] = new boolean[1];		
		LibraryLockingOperationRunner runner = new LibraryLockingOperationRunner();
		runner.run(new IRunnableWithProgress() {
			public void run(IProgressMonitor monitor) throws InvocationTargetException, InterruptedException {
				ret[0] = performFinish_();
			}			
		});
		if (refresh) {
			try {
				Thread.sleep(1000); // temp solution for potential racing
			} catch (Exception e) {
			}
			RefreshJob.getInstance().setEnabled(true);
		}
		
		
		runner = new LibraryLockingOperationRunner();
		runner.run(new IRunnableWithProgress() {
			public void run(IProgressMonitor monitor) throws InvocationTargetException, InterruptedException {
				String msg = NLS.bind(ImportXMLResources.review_log_files,
						service.getLogPath());
					MsgBox.prompt(msg, SWT.OK);
			}			
		});		
		
		ResourceUtil.refreshResources(LibraryService.getInstance()
				.getCurrentMethodLibrary(), new NullProgressMonitor());
		
		return ret[0];
	}
	
	/**
	 * @see org.eclipse.jface.wizard.IWizard#performFinish()
	 */
	private boolean performFinish_() {
		LibraryBackupUtil.promptBackupCurrentLibrary(null, LibraryService
				.getInstance());

		IRunnableWithProgress op = new IRunnableWithProgress() {
			public void run(IProgressMonitor monitor)
					throws InvocationTargetException {
				try {
					monitor.beginTask(ImportXMLResources.importingXML_text,
							IProgressMonitor.UNKNOWN);

					String xmlFile = filePage.getPath();
					boolean mergeOption = filePage.getMergeOption();
					boolean checkBasePlugins = filePage.getCheckBasePlugins();
					service.setOverwrite(!mergeOption);
					service.setCheckBasePlugins(checkBasePlugins);
					succeed = service.loadXml(xmlFile);
					if (! succeed) {
						return;
					}					
					service.doImport(monitor);
					ImportXMLPreferences.setXMLFile(xmlFile);
					ImportXMLPreferences.setMergeOption(mergeOption);
					ImportXMLPreferences.setCheckBasePluginsOption(checkBasePlugins);
				} catch (Exception e) {
					throw new InvocationTargetException(e);
				} finally {
					monitor.done();
				}

			}
		};
		try {
			getContainer().run(true, false, op);
		} catch (InterruptedException e) {
			return false;
		} catch (InvocationTargetException e) {
			Throwable realException = e.getTargetException();
			ImportXMLPlugin.getDefault().getMsgDialog().displayError(
					ImportXMLResources.importXMLWizard_title,
					realException.getMessage(), realException);
			return false;
		}

		if (!succeed) {
			return false;
		}
		//String msg = NLS.bind(ImportXMLResources.review_log_files,
		//	service.getLogPath());
		//MsgBox.prompt(msg, SWT.OK);

		return true;
	}

	/**
	 * Disposes of this wizard and frees all SWT resources.
	 */
	public void dispose() {
		service.dispose();
	}
}