/*******************************************************************************
 * Copyright (c) 2009 Red Hat, Inc.
 * 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:
 *    Red Hat - initial API and implementation
 *******************************************************************************/
package org.eclipse.linuxtools.internal.valgrind.ui.editor.wizards;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.operation.IRunnableWithProgress;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.wizard.Wizard;
import org.eclipse.linuxtools.internal.valgrind.ui.editor.ValgrindEditorPlugin;
import org.eclipse.osgi.util.NLS;
import org.eclipse.ui.INewWizard;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWizard;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.dialogs.WizardNewFileCreationPage;
import org.eclipse.ui.ide.IDE;

/**
 * This is a sample new wizard. Its role is to create a new file 
 * resource in the provided container. If the container resource
 * (a folder or a project) is selected in the workspace 
 * when the wizard is opened, it will accept it as the target
 * container. The wizard creates one file with the extension
 * "mpe". If a sample multi-page editor (also available
 * as a template) is registered for the same extension, it will
 * be able to open it.
 */

public class NewSuppressionWizard extends Wizard implements INewWizard {
	private static final String EXT_SUPP = "supp"; //$NON-NLS-1$
	private WizardNewFileCreationPage page;
	private IStructuredSelection selection;

	/**
	 * Constructor for NewSuppressionWizard.
	 */
	public NewSuppressionWizard() {
		super();
		setNeedsProgressMonitor(true);
	}
	
	/**
	 * Adding the page to the wizard.
	 */

	public void addPages() {
		page = new WizardNewFileCreationPage("newSuppressionPage", selection); //$NON-NLS-1$
		page.setTitle(Messages.getString("NewSuppressionWizard.NewWizard_title")); //$NON-NLS-1$
		page.setDescription(Messages.getString("NewSuppressionWizard.NewWizard_description")); //$NON-NLS-1$
		page.setImageDescriptor(ValgrindEditorPlugin.imageDescriptorFromPlugin(ValgrindEditorPlugin.PLUGIN_ID, "icons/newsupp_wiz.png")); //$NON-NLS-1$
		page.setFileExtension(EXT_SUPP);
		addPage(page);
	}

	/**
	 * This method is called when 'Finish' button is pressed in
	 * the wizard. We will create an operation and run it
	 * using wizard as execution context.
	 */
	public boolean performFinish() {
		final String containerName = page.getContainerFullPath().toOSString();
		final String fileName = page.getFileName();
		IRunnableWithProgress op = new IRunnableWithProgress() {
			public void run(IProgressMonitor monitor) throws InvocationTargetException {
				try {
					doFinish(containerName, fileName, monitor);
				} catch (CoreException 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();
			MessageDialog.openError(getShell(), Messages.getString("NewSuppressionWizard.performFinish_error"), realException.getMessage()); //$NON-NLS-1$
			return false;
		}
		return true;
	}
	
	/**
	 * The worker method. It will find the container, create the
	 * file if missing or just replace its contents, and open
	 * the editor on the newly created file.
	 */

	private void doFinish(
		String containerName,
		String fileName,
		IProgressMonitor monitor)
		throws CoreException {
		// create a sample file
		monitor.beginTask(NLS.bind(Messages.getString("NewSuppressionWizard.Creating_task"), fileName), 2); //$NON-NLS-1$
		IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
		IResource resource = root.findMember(new Path(containerName));
		if (!resource.exists() || !(resource instanceof IContainer)) {
			throwCoreException(NLS.bind(Messages.getString("NewSuppressionWizard.Container_not_exist_error"), containerName)); //$NON-NLS-1$
		}
		IContainer container = (IContainer) resource;
		final IFile file = container.getFile(new Path(fileName));
		try {
			InputStream stream = openContentStream();
			if (file.exists()) {
				file.setContents(stream, true, true, monitor);
			} else {
				file.create(stream, true, monitor);
			}
			stream.close();
		} catch (IOException e) {
		}
		monitor.worked(1);
		monitor.setTaskName(Messages.getString("NewSuppressionWizard.Opening_file_task")); //$NON-NLS-1$
		getShell().getDisplay().asyncExec(new Runnable() {
			public void run() {
				IWorkbenchPage page =
					PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
				try {
					IDE.openEditor(page, file, true);
				} catch (PartInitException e) {
				}
			}
		});
		monitor.worked(1);
	}
	
	/**
	 * We will initialize file contents with a sample text.
	 */

	private InputStream openContentStream() {
		String contents =
			"{\n\t\n}"; //$NON-NLS-1$
		return new ByteArrayInputStream(contents.getBytes());
	}

	private void throwCoreException(String message) throws CoreException {
		IStatus status =
			new Status(IStatus.ERROR, ValgrindEditorPlugin.PLUGIN_ID, IStatus.OK, message, null);
		throw new CoreException(status);
	}

	/**
	 * We will accept the selection in the workbench to see if
	 * we can initialize from it.
	 * @see IWorkbenchWizard#init(IWorkbench, IStructuredSelection)
	 */
	public void init(IWorkbench workbench, IStructuredSelection selection) {
		this.selection = selection;
	}
}