/*
 * Copyright (c) 2005, 2017 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 - initial API and implementation
 *   Kenn Hussey (Embarcadero Technologies) - 227392, 204200
 *   Kenn Hussey - 323181, 522658
 *
 */
package org.eclipse.uml2.uml.editor.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.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.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;

import org.eclipse.emf.ecore.resource.impl.ResourceSetImpl;

import org.eclipse.emf.ecore.EObject;

import org.eclipse.emf.ecore.xmi.XMLResource;

import org.eclipse.emf.edit.ui.provider.ExtendedImageRegistry;

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.jface.dialogs.MessageDialog;

import org.eclipse.jface.viewers.IStructuredSelection;

import org.eclipse.jface.wizard.Wizard;
import org.eclipse.jface.wizard.WizardPage;

import org.eclipse.swt.SWT;

import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.events.ModifyEvent;

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.actions.WorkspaceModifyOperation;

import org.eclipse.ui.dialogs.WizardNewFileCreationPage;

import org.eclipse.ui.part.FileEditorInput;
import org.eclipse.ui.part.ISetSelectionTarget;

import org.eclipse.uml2.uml.UMLFactory;
import org.eclipse.uml2.uml.UMLPackage;
import org.eclipse.uml2.uml.edit.UMLEditPlugin;

import org.eclipse.core.runtime.Path;

import org.eclipse.core.runtime.Platform;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.StructuredSelection;

import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PartInitException;

import org.eclipse.uml2.uml.editor.UMLEditorPlugin;

/**
 * This is a simple wizard for creating a new model file.
 * <!-- begin-user-doc -->
 * <!-- end-user-doc -->
 * @generated
 */
public class UMLModelWizard
		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(UMLEditorPlugin.INSTANCE
			.getString("_UI_UMLEditorFilenameExtensions").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 = UMLEditorPlugin.INSTANCE
		.getString("_UI_UMLEditorFilenameExtensions")
		.replaceAll("\\s*,\\s*", ", ");

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

	/**
	 * This caches an instance of the model factory.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	protected UMLFactory umlFactory = umlPackage.getUMLFactory();

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

	/**
	 * This is the initial object creation page.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	protected UMLModelWizardInitialObjectCreationPage 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
	 */
	public void init(IWorkbench workbench, IStructuredSelection selection) {
		this.workbench = workbench;
		this.selection = selection;
		setWindowTitle(UMLEditorPlugin.INSTANCE.getString("_UI_Wizard_label")); //$NON-NLS-1$
		setDefaultPageImageDescriptor(
			ExtendedImageRegistry.INSTANCE.getImageDescriptor(
				UMLEditorPlugin.INSTANCE.getImage("full/wizban/NewUML"))); //$NON-NLS-1$
	}

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

	protected Collection<String> getInitialObjectNames() {

		if (initialObjectNames == null) {
			initialObjectNames = new ArrayList<String>();
			initialObjectNames.add(umlPackage.getModel().getName());
			initialObjectNames.add(umlPackage.getPackage().getName());
			initialObjectNames.add(umlPackage.getProfile().getName());
		}

		return initialObjectNames;
	}

	/**
	 * Create a new model.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	protected EObject createInitialModel() {
		EClass eClass = (EClass) umlPackage
			.getEClassifier(initialObjectCreationPage.getInitialObjectName());
		EObject rootObject = umlFactory.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.
			//
			WorkspaceModifyOperation operation = new WorkspaceModifyOperation() {

				@Override
				protected void execute(IProgressMonitor progressMonitor) {
					try {
						// Create a resource set
						//
						ResourceSet resourceSet = new ResourceSetImpl();

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

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

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

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

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

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

					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(),
							Platform.getContentTypeManager()
								.getContentType(UMLPackage.eCONTENT_TYPE))
					.getId());
			} catch (PartInitException exception) {
				MessageDialog.openError(
					workbenchWindow.getShell(), UMLEditorPlugin.INSTANCE
						.getString("_UI_OpenEditorError_label"), //$NON-NLS-1$
					exception.getMessage());
				return false;
			}

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

	/**
	 * This is the one page of the wizard.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public class UMLModelWizardNewFileCreationPage
			extends WizardNewFileCreationPage {

		/**
		 * Pass in the selection.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		public UMLModelWizardNewFileCreationPage(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()) {
				String extension = new Path(getFileName()).getFileExtension();
				if (extension == null || !FILE_EXTENSIONS.contains(extension)) {
					String key = FILE_EXTENSIONS.size() > 1
						? "_WARN_FilenameExtensions" //$NON-NLS-1$
						: "_WARN_FilenameExtension"; //$NON-NLS-1$
					setErrorMessage(UMLEditorPlugin.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 UMLModelWizardInitialObjectCreationPage
			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 UMLModelWizardInitialObjectCreationPage(String pageId) {
			super(pageId);
		}

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

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

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

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

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

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

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

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

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

			for (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() {

			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() {
			String label = initialObjectField.getText();

			for (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 UMLEditPlugin.INSTANCE
					.getString("_UI_" + typeName + "_type"); //$NON-NLS-1$ //$NON-NLS-2$
			} catch (MissingResourceException mre) {
				UMLEditorPlugin.INSTANCE.log(mre);
			}
			return typeName;
		}

		/**
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		protected Collection<String> getEncodings() {
			if (encodings == null) {
				encodings = new ArrayList<String>();
				for (StringTokenizer stringTokenizer = new StringTokenizer(
					UMLEditorPlugin.INSTANCE
						.getString("_UI_XMLEncodingChoices")); stringTokenizer //$NON-NLS-1$
							.hasMoreTokens();) {
					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 UMLModelWizardNewFileCreationPage("Whatever", //$NON-NLS-1$
			selection);
		newFileCreationPage.setTitle(
			UMLEditorPlugin.INSTANCE.getString("_UI_UMLModelWizard_label")); //$NON-NLS-1$
		newFileCreationPage.setDescription(UMLEditorPlugin.INSTANCE
			.getString("_UI_UMLModelWizard_description")); //$NON-NLS-1$
		newFileCreationPage.setFileName(UMLEditorPlugin.INSTANCE.getString(
			"_UI_UMLEditorFilenameDefaultBase") + "." + FILE_EXTENSIONS.get(0)); //$NON-NLS-1$ //$NON-NLS-2$
		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...
			//
			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.
					//
					String defaultModelBaseFilename = UMLEditorPlugin.INSTANCE
						.getString("_UI_UMLEditorFilenameDefaultBase"); //$NON-NLS-1$
					String defaultModelFilenameExtension = FILE_EXTENSIONS
						.get(0);
					String modelFilename = defaultModelBaseFilename + "." //$NON-NLS-1$
						+ defaultModelFilenameExtension;
					for (int i = 1; ((IContainer) selectedResource)
						.findMember(modelFilename) != null; ++i) {
						modelFilename = defaultModelBaseFilename + i + "." //$NON-NLS-1$
							+ defaultModelFilenameExtension;
					}
					newFileCreationPage.setFileName(modelFilename);
				}
			}
		}
		initialObjectCreationPage = new UMLModelWizardInitialObjectCreationPage(
			"Whatever2"); //$NON-NLS-1$
		initialObjectCreationPage.setTitle(
			UMLEditorPlugin.INSTANCE.getString("_UI_UMLModelWizard_label")); //$NON-NLS-1$
		initialObjectCreationPage.setDescription(UMLEditorPlugin.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();
	}

}