/*******************************************************************************
 * Copyright (c) 2007, 2010 BMW Car IT, Technische Universitaet Muenchen, 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:
 * BMW Car IT - Initial API and implementation
 * Technische Universitaet Muenchen - Major refactoring and extension
 *******************************************************************************/
package org.eclipse.emf.edapt.history.presentation;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.MissingResourceException;
import java.util.StringTokenizer;

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IFolder;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.Path;
import org.eclipse.emf.common.CommonPlugin;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EClassifier;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.resource.impl.ResourceSetImpl;
import org.eclipse.emf.ecore.xmi.XMLResource;
import org.eclipse.emf.edapt.spi.history.HistoryFactory;
import org.eclipse.emf.edapt.spi.history.HistoryPackage;
import org.eclipse.emf.edapt.spi.history.provider.HistoryEditPlugin;
import org.eclipse.emf.edit.ui.provider.ExtendedImageRegistry;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.wizard.Wizard;
import org.eclipse.jface.wizard.WizardPage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;
import org.eclipse.ui.INewWizard;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.actions.WorkspaceModifyOperation;
import org.eclipse.ui.dialogs.WizardNewFileCreationPage;
import org.eclipse.ui.part.FileEditorInput;
import org.eclipse.ui.part.ISetSelectionTarget;

/**
 * This is a simple wizard for creating a new model file.
 * <!-- begin-user-doc -->
 * <!-- end-user-doc -->
 *
 * @generated
 */
public class HistoryModelWizard extends Wizard implements INewWizard {
	/**
	 * The supported extensions for created files.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 *
	 * @generated
	 */
	public static final List<String> FILE_EXTENSIONS =
		Collections.unmodifiableList(Arrays.asList(HistoryEditorPlugin.INSTANCE.getString(
			"_UI_HistoryEditorFilenameExtensions").split("\\s*,\\s*"))); //$NON-NLS-1$ //$NON-NLS-2$

	/**
	 * A formatted list of supported file extensions, suitable for display.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 *
	 * @generated
	 */
	public static final String FORMATTED_FILE_EXTENSIONS =
		HistoryEditorPlugin.INSTANCE.getString("_UI_HistoryEditorFilenameExtensions").replaceAll("\\s*,\\s*", ", "); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$

	/**
	 * This caches an instance of the model package.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 *
	 * @generated
	 */
	protected HistoryPackage historyPackage = HistoryPackage.eINSTANCE;

	/**
	 * This caches an instance of the model factory.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 *
	 * @generated
	 */
	protected HistoryFactory historyFactory = historyPackage.getHistoryFactory();

	/**
	 * This is the file creation page.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 *
	 * @generated
	 */
	protected HistoryModelWizardNewFileCreationPage newFileCreationPage;

	/**
	 * This is the initial object creation page.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 *
	 * @generated
	 */
	protected HistoryModelWizardInitialObjectCreationPage initialObjectCreationPage;

	/**
	 * Remember the selection during initialization for populating the default container.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 *
	 * @generated
	 */
	protected IStructuredSelection selection;

	/**
	 * Remember the workbench during initialization.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 *
	 * @generated
	 */
	protected IWorkbench workbench;

	/**
	 * Caches the names of the types that can be created as the root object.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 *
	 * @generated
	 */
	protected List<String> initialObjectNames;

	/**
	 * This just records the information.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 *
	 * @generated
	 */
	@Override
	public void init(IWorkbench workbench, IStructuredSelection selection) {
		this.workbench = workbench;
		this.selection = selection;
		setWindowTitle(HistoryEditorPlugin.INSTANCE.getString("_UI_Wizard_label")); //$NON-NLS-1$
		setDefaultPageImageDescriptor(ExtendedImageRegistry.INSTANCE.getImageDescriptor(HistoryEditorPlugin.INSTANCE
			.getImage("full/wizban/NewHistory"))); //$NON-NLS-1$
	}

	/**
	 * Returns the names of the types that can be created as the root object.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 *
	 * @generated
	 */
	protected Collection<String> getInitialObjectNames() {
		if (initialObjectNames == null) {
			initialObjectNames = new ArrayList<String>();
			for (final EClassifier eClassifier : historyPackage.getEClassifiers()) {
				if (eClassifier instanceof EClass) {
					final EClass eClass = (EClass) eClassifier;
					if (!eClass.isAbstract()) {
						initialObjectNames.add(eClass.getName());
					}
				}
			}
			Collections.sort(initialObjectNames, CommonPlugin.INSTANCE.getComparator());
		}
		return initialObjectNames;
	}

	/**
	 * Create a new model.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 *
	 * @generated
	 */
	protected EObject createInitialModel() {
		final EClass eClass = (EClass) historyPackage.getEClassifier(initialObjectCreationPage.getInitialObjectName());
		final EObject rootObject = historyFactory.create(eClass);
		return rootObject;
	}

	/**
	 * Do the work after everything is specified.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 *
	 * @generated
	 */
	@Override
	public boolean performFinish() {
		try {
			// Remember the file.
			//
			final IFile modelFile = getModelFile();

			// Do the work within an operation.
			//
			final WorkspaceModifyOperation operation =
				new WorkspaceModifyOperation() {
					@Override
					protected void execute(IProgressMonitor progressMonitor) {
						try {
							// Create a resource set
							//
							final ResourceSet resourceSet = new ResourceSetImpl();

							// Get the URI of the model file.
							//
							final URI fileURI = URI.createPlatformResourceURI(modelFile.getFullPath().toString(), true);

							// Create a resource for this file.
							//
							final Resource resource = resourceSet.createResource(fileURI);

							// Add the initial model object to the contents.
							//
							final EObject rootObject = createInitialModel();
							if (rootObject != null) {
								resource.getContents().add(rootObject);
							}

							// Save the contents of the resource to the file system.
							//
							final Map<Object, Object> options = new HashMap<Object, Object>();
							options.put(XMLResource.OPTION_ENCODING, initialObjectCreationPage.getEncoding());
							resource.save(options);
						}
						catch (final Exception exception) {
							HistoryEditorPlugin.INSTANCE.log(exception);
						}
						finally {
							progressMonitor.done();
						}
					}
				};

			getContainer().run(false, false, operation);

			// Select the new file resource in the current view.
			//
			final IWorkbenchWindow workbenchWindow = workbench.getActiveWorkbenchWindow();
			final IWorkbenchPage page = workbenchWindow.getActivePage();
			final IWorkbenchPart activePart = page.getActivePart();
			if (activePart instanceof ISetSelectionTarget) {
				final ISelection targetSelection = new StructuredSelection(modelFile);
				getShell().getDisplay().asyncExec
					(new Runnable() {
						@Override
						public void run() {
							((ISetSelectionTarget) activePart).selectReveal(targetSelection);
						}
					});
			}

			// Open an editor on the new file.
			//
			try {
				page.openEditor
					(new FileEditorInput(modelFile),
						workbench.getEditorRegistry().getDefaultEditor(modelFile.getFullPath().toString()).getId());
			} catch (final PartInitException exception) {
				MessageDialog.openError(workbenchWindow.getShell(),
					HistoryEditorPlugin.INSTANCE.getString("_UI_OpenEditorError_label"), exception.getMessage()); //$NON-NLS-1$
				return false;
			}

			return true;
		} catch (final Exception exception) {
			HistoryEditorPlugin.INSTANCE.log(exception);
			return false;
		}
	}

	/**
	 * This is the one page of the wizard.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 *
	 * @generated
	 */
	public class HistoryModelWizardNewFileCreationPage extends WizardNewFileCreationPage {
		/**
		 * Pass in the selection.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 *
		 * @generated
		 */
		public HistoryModelWizardNewFileCreationPage(String pageId, IStructuredSelection selection) {
			super(pageId, selection);
		}

		/**
		 * The framework calls this to see if the file is correct.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 *
		 * @generated
		 */
		@Override
		protected boolean validatePage() {
			if (super.validatePage()) {
				final String extension = new Path(getFileName()).getFileExtension();
				if (extension == null || !FILE_EXTENSIONS.contains(extension)) {
					final String key = FILE_EXTENSIONS.size() > 1 ? "_WARN_FilenameExtensions" //$NON-NLS-1$
						: "_WARN_FilenameExtension"; //$NON-NLS-1$
					setErrorMessage(HistoryEditorPlugin.INSTANCE.getString(key,
						new Object[] { FORMATTED_FILE_EXTENSIONS }));
					return false;
				}
				return true;
			}
			return false;
		}

		/**
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 *
		 * @generated
		 */
		public IFile getModelFile() {
			return ResourcesPlugin.getWorkspace().getRoot().getFile(getContainerFullPath().append(getFileName()));
		}
	}

	/**
	 * This is the page where the type of object to create is selected.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 *
	 * @generated
	 */
	public class HistoryModelWizardInitialObjectCreationPage extends WizardPage {
		/**
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 *
		 * @generated
		 */
		protected Combo initialObjectField;

		/**
		 * @generated
		 *            <!-- begin-user-doc -->
		 *            <!-- end-user-doc -->
		 */
		protected List<String> encodings;

		/**
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 *
		 * @generated
		 */
		protected Combo encodingField;

		/**
		 * Pass in the selection.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 *
		 * @generated
		 */
		public HistoryModelWizardInitialObjectCreationPage(String pageId) {
			super(pageId);
		}

		/**
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 *
		 * @generated
		 */
		@Override
		public void createControl(Composite parent) {
			final Composite composite = new Composite(parent, SWT.NONE);
			{
				final GridLayout layout = new GridLayout();
				layout.numColumns = 1;
				layout.verticalSpacing = 12;
				composite.setLayout(layout);

				final GridData data = new GridData();
				data.verticalAlignment = GridData.FILL;
				data.grabExcessVerticalSpace = true;
				data.horizontalAlignment = GridData.FILL;
				composite.setLayoutData(data);
			}

			final Label containerLabel = new Label(composite, SWT.LEFT);
			{
				containerLabel.setText(HistoryEditorPlugin.INSTANCE.getString("_UI_ModelObject")); //$NON-NLS-1$

				final GridData data = new GridData();
				data.horizontalAlignment = GridData.FILL;
				containerLabel.setLayoutData(data);
			}

			initialObjectField = new Combo(composite, SWT.BORDER);
			{
				final GridData data = new GridData();
				data.horizontalAlignment = GridData.FILL;
				data.grabExcessHorizontalSpace = true;
				initialObjectField.setLayoutData(data);
			}

			for (final String objectName : getInitialObjectNames()) {
				initialObjectField.add(getLabel(objectName));
			}

			if (initialObjectField.getItemCount() == 1) {
				initialObjectField.select(0);
			}
			initialObjectField.addModifyListener(validator);

			final Label encodingLabel = new Label(composite, SWT.LEFT);
			{
				encodingLabel.setText(HistoryEditorPlugin.INSTANCE.getString("_UI_XMLEncoding")); //$NON-NLS-1$

				final GridData data = new GridData();
				data.horizontalAlignment = GridData.FILL;
				encodingLabel.setLayoutData(data);
			}
			encodingField = new Combo(composite, SWT.BORDER);
			{
				final GridData data = new GridData();
				data.horizontalAlignment = GridData.FILL;
				data.grabExcessHorizontalSpace = true;
				encodingField.setLayoutData(data);
			}

			for (final String encoding : getEncodings()) {
				encodingField.add(encoding);
			}

			encodingField.select(0);
			encodingField.addModifyListener(validator);

			setPageComplete(validatePage());
			setControl(composite);
		}

		/**
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 *
		 * @generated
		 */
		protected ModifyListener validator =
			new ModifyListener() {
				@Override
				public void modifyText(ModifyEvent e) {
					setPageComplete(validatePage());
				}
			};

		/**
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 *
		 * @generated
		 */
		protected boolean validatePage() {
			return getInitialObjectName() != null && getEncodings().contains(encodingField.getText());
		}

		/**
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 *
		 * @generated
		 */
		@Override
		public void setVisible(boolean visible) {
			super.setVisible(visible);
			if (visible) {
				if (initialObjectField.getItemCount() == 1) {
					initialObjectField.clearSelection();
					encodingField.setFocus();
				}
				else {
					encodingField.clearSelection();
					initialObjectField.setFocus();
				}
			}
		}

		/**
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 *
		 * @generated
		 */
		public String getInitialObjectName() {
			final String label = initialObjectField.getText();

			for (final String name : getInitialObjectNames()) {
				if (getLabel(name).equals(label)) {
					return name;
				}
			}
			return null;
		}

		/**
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 *
		 * @generated
		 */
		public String getEncoding() {
			return encodingField.getText();
		}

		/**
		 * Returns the label for the specified type name.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 *
		 * @generated
		 */
		protected String getLabel(String typeName) {
			try {
				return HistoryEditPlugin.INSTANCE.getString("_UI_" + typeName + "_type"); //$NON-NLS-1$ //$NON-NLS-2$
			} catch (final MissingResourceException mre) {
				HistoryEditorPlugin.INSTANCE.log(mre);
			}
			return typeName;
		}

		/**
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 *
		 * @generated
		 */
		protected Collection<String> getEncodings() {
			if (encodings == null) {
				encodings = new ArrayList<String>();
				for (final StringTokenizer stringTokenizer = new StringTokenizer(
					HistoryEditorPlugin.INSTANCE.getString("_UI_XMLEncodingChoices")); stringTokenizer.hasMoreTokens();) { //$NON-NLS-1$
					encodings.add(stringTokenizer.nextToken());
				}
			}
			return encodings;
		}
	}

	/**
	 * The framework calls this to create the contents of the wizard.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 *
	 * @generated
	 */
	@Override
	public void addPages() {
		// Create a page, set the title, and the initial model file name.
		//
		newFileCreationPage = new HistoryModelWizardNewFileCreationPage("Whatever", selection); //$NON-NLS-1$
		newFileCreationPage.setTitle(HistoryEditorPlugin.INSTANCE.getString("_UI_HistoryModelWizard_label")); //$NON-NLS-1$
		newFileCreationPage
			.setDescription(HistoryEditorPlugin.INSTANCE.getString("_UI_HistoryModelWizard_description")); //$NON-NLS-1$
		newFileCreationPage.setFileName(HistoryEditorPlugin.INSTANCE.getString("_UI_HistoryEditorFilenameDefaultBase") //$NON-NLS-1$
			+ "." + FILE_EXTENSIONS.get(0)); //$NON-NLS-1$
		addPage(newFileCreationPage);

		// Try and get the resource selection to determine a current directory for the file dialog.
		//
		if (selection != null && !selection.isEmpty()) {
			// Get the resource...
			//
			final Object selectedElement = selection.iterator().next();
			if (selectedElement instanceof IResource) {
				// Get the resource parent, if its a file.
				//
				IResource selectedResource = (IResource) selectedElement;
				if (selectedResource.getType() == IResource.FILE) {
					selectedResource = selectedResource.getParent();
				}

				// This gives us a directory...
				//
				if (selectedResource instanceof IFolder || selectedResource instanceof IProject) {
					// Set this for the container.
					//
					newFileCreationPage.setContainerFullPath(selectedResource.getFullPath());

					// Make up a unique new name here.
					//
					final String defaultModelBaseFilename = HistoryEditorPlugin.INSTANCE
						.getString("_UI_HistoryEditorFilenameDefaultBase"); //$NON-NLS-1$
					final String defaultModelFilenameExtension = FILE_EXTENSIONS.get(0);
					String modelFilename = defaultModelBaseFilename + "." + defaultModelFilenameExtension; //$NON-NLS-1$
					for (int i = 1; ((IContainer) selectedResource).findMember(modelFilename) != null; ++i) {
						modelFilename = defaultModelBaseFilename + i + "." + defaultModelFilenameExtension; //$NON-NLS-1$
					}
					newFileCreationPage.setFileName(modelFilename);
				}
			}
		}
		initialObjectCreationPage = new HistoryModelWizardInitialObjectCreationPage("Whatever2"); //$NON-NLS-1$
		initialObjectCreationPage.setTitle(HistoryEditorPlugin.INSTANCE.getString("_UI_HistoryModelWizard_label")); //$NON-NLS-1$
		initialObjectCreationPage.setDescription(HistoryEditorPlugin.INSTANCE
			.getString("_UI_Wizard_initial_object_description")); //$NON-NLS-1$
		addPage(initialObjectCreationPage);
	}

	/**
	 * Get the file from the page.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 *
	 * @generated
	 */
	public IFile getModelFile() {
		return newFileCreationPage.getModelFile();
	}

}