/*****************************************************************************
 * Copyright (c) 2012, 2016 CEA LIST, Christian W. Damus, and others.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *  Vincent Lorenzo (CEA LIST) Vincent.Lorenzo@cea.fr - Initial API and implementation
 *  Ansgar Radermacher (CEA LIST) ansgar.radermacher@cea.fr
 *  Christian W. Damus - bug 485220
 *
 *****************************************************************************/
package org.eclipse.papyrus.designer.languages.java.jdt.texteditor.handler;

import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.Status;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.transaction.TransactionalEditingDomain;
import org.eclipse.emf.workspace.AbstractEMFOperation;
import org.eclipse.papyrus.designer.languages.common.extensionpoints.ILangCodegen;
import org.eclipse.papyrus.designer.languages.common.extensionpoints.LanguageCodegen;
import org.eclipse.papyrus.designer.languages.java.jdt.texteditor.Activator;
import org.eclipse.papyrus.designer.languages.java.jdt.texteditor.TextEditorConstants;
import org.eclipse.papyrus.designer.languages.java.jdt.texteditor.editor.SyncJDTEditor;
import org.eclipse.papyrus.designer.languages.java.jdt.texteditor.sync.SyncJDTtoModel;
import org.eclipse.papyrus.designer.languages.java.jdt.texteditor.sync.SyncModelToJDT;
import org.eclipse.papyrus.infra.core.resource.NotFoundException;
import org.eclipse.papyrus.infra.core.services.ServiceException;
import org.eclipse.papyrus.infra.core.services.ServicesRegistry;
import org.eclipse.papyrus.infra.core.utils.ServiceUtils;
import org.eclipse.papyrus.infra.emf.gmf.command.CheckedOperationHistory;
import org.eclipse.papyrus.infra.ui.util.ServiceUtilsForHandlers;
import org.eclipse.papyrus.uml.diagram.common.handlers.CmdHandler;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.part.FileEditorInput;
import org.eclipse.uml2.uml.Behavior;
import org.eclipse.uml2.uml.Class;
import org.eclipse.uml2.uml.Classifier;
import org.eclipse.uml2.uml.Element;
import org.eclipse.uml2.uml.Operation;
import org.eclipse.uml2.uml.Transition;
import org.eclipse.uml2.uml.UMLPackage;


/**
 * The handler creates a new JDT editor
 */
public class SyncJDTEditorHandler extends CmdHandler {


	private static final String EDITOR_ID = "org.eclipse.papyrus.designer.languages.java.jdt.texteditor.editor.SyncJDTEditor"; //$NON-NLS-1$

	public SyncJDTEditorHandler() {
	}

	/**
	 * @see org.eclipse.core.commands.AbstractHandler#isEnabled()
	 *
	 * @return true, if enabled
	 */
	@Override
	public boolean isEnabled() {
		updateSelectedEObject();
		// Filter Classes (including Behaviors, since Behavior inherits from Class), Operation and Transition
		if (selectedEObject instanceof Class ||
				selectedEObject instanceof Operation ||
				selectedEObject instanceof Transition) {

			URI uri = selectedEObject.eResource().getURI();
			// URI must have at least two segments (must be in a project)
			return uri.segmentCount() >= 2;
		}
		return false;
	}

	/**
	 * @see org.eclipse.core.commands.IHandler#execute(org.eclipse.core.commands.ExecutionEvent)
	 *
	 * @param event
	 *            an execution event
	 * @return the execution result
	 * @throws ExecutionException
	 */
	@Override
	public Object execute(final ExecutionEvent event) throws ExecutionException {
		try {
			final ServicesRegistry serviceRegistry = ServiceUtilsForHandlers.getInstance().getServiceRegistry(event);
			TransactionalEditingDomain domain = ServiceUtils.getInstance().getTransactionalEditingDomain(serviceRegistry);

			// Create the transactional command
			AbstractEMFOperation command = new AbstractEMFOperation(domain, "Create JDT editor") { //$NON-NLS-1$

				@Override
				protected IStatus doExecute(final IProgressMonitor monitor, final IAdaptable info) throws ExecutionException {
					try {
						SyncJDTEditorHandler.this.doExecute(serviceRegistry);
					} catch (ServiceException e) {
						Activator.log.error(e);
						return Status.CANCEL_STATUS;
					} catch (NotFoundException e) {
						Activator.log.error(e);
						return Status.CANCEL_STATUS;
					}
					return Status.OK_STATUS;
				}
			};

			// Execute the command
			CheckedOperationHistory.getInstance().execute(command, new NullProgressMonitor(), null);
		} catch (ExecutionException e) {
			Activator.log.error("Can't create a JDT editor", e); //$NON-NLS-1$
		} catch (ServiceException e) {
			Activator.log.error("Service exception during creation of CDT editor", e); //$NON-NLS-1$
		}
		return null;
	}


	/**
	 * Do the execution of the command.
	 *
	 * @param serviceRegistry
	 * @throws ServiceException
	 * @throws NotFoundException
	 */
	public void doExecute(final ServicesRegistry serviceRegistry) throws ServiceException, NotFoundException {
		Classifier classifierToEdit = getClassifierToEdit();
		// Fixed ID, since synchronization only works for standard C++ code generator
		final ILangCodegen codegen =
				LanguageCodegen.getGenerator(TextEditorConstants.JAVA, null);
		if (codegen == null) {
			return;
		}

		if (selectedEObject instanceof Transition) {
			Transition transition = (Transition) selectedEObject;
			if (transition.getEffect() == null) {
				transition.createEffect("effectOf" + transition.getName(), UMLPackage.eINSTANCE.getOpaqueBehavior()); //$NON-NLS-1$
			}
		}
		
		// make sure that target project gets generated
		codegen.getTargetProject(classifierToEdit, true);
		IFile srcFile = SyncModelToJDT.syncModelToCDT(classifierToEdit, LanguageCodegen.getID(codegen));
		if (srcFile == null) {
			return;
		}

		Display.getDefault().asyncExec(new Runnable() {

			@Override
			public void run() {
				IWorkbenchPage page = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
				try {
					// IEditorPart editorPart = page.openEditor(new FileEditorInput(srcFile), "org.eclipse.cdt.ui.editor.CEditor");
					
					IEditorInput input = new FileEditorInput(srcFile);
					IEditorPart editorPart = page.openEditor(input, EDITOR_ID);
					if (editorPart instanceof SyncJDTEditor) {
						// TODO: use editorPart.setInitializationData(cfig, propertyName, data);
						URI uri = selectedEObject.eResource().getURI();
						SyncJDTtoModel syncCpp =
								new SyncJDTtoModel(input, classifierToEdit, URI.decode(uri.segment(1)), LanguageCodegen.getID(codegen));

						((SyncJDTEditor) editorPart).setEditorData(serviceRegistry, syncCpp);
					}
				} catch (PartInitException e) {
					Activator.log.error(e);
				}
				// move page to the RIGHT

//				if (rootModel instanceof TabFolder) {
//					// root = tabFolder, i.e. there is a single folder
//					ISashWindowsContainer sashContainer = ServiceUtils.getInstance().getService(ISashWindowsContainer.class, serviceRegistry);
//					int index = lookupIndex((TabFolder) rootModel, editorModelFinal);
//					if (index != -1) {
//						sashContentProvider.createFolder(sashContainer.getSelectedTabFolderModel(), index, sashContainer.getSelectedTabFolderModel(), SWT.RIGHT);
//					}
//				}
			}
		});

	}

	/**
	 * The classifier to edit - corresponding to the selected object.
	 *
	 * @return
	 */
	protected Classifier getClassifierToEdit() {
		if (selectedEObject instanceof Operation) {
			return ((Operation) selectedEObject).getFeaturingClassifiers().get(0);
		} else if (selectedEObject instanceof Transition) {
			return ((Transition) selectedEObject).getContainer().getStateMachine().getContext();
		} else if (selectedEObject instanceof Behavior) {
			Element owner = (Behavior) selectedEObject;
			while (owner != null) {
				owner = owner.getOwner();
				if ((owner instanceof Classifier) && !(owner instanceof Behavior)) {
					return (Classifier) owner;
				}
			}
			return null;
		} else if (selectedEObject instanceof Classifier) {
			// must be class or datatype
			return (Classifier) selectedEObject;
		}
		return null;
	}
}