/*****************************************************************************
 * Copyright (c) 2017 CEA LIST 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:
 *   Nicolas FAUVERGUE (CEA LIST) nicolas.fauvergue@cea.fr - Initial API and implementation
 *   
 *****************************************************************************/

package org.eclipse.papyrus.interoperability.sysml14.sysml.xmi.helper;

import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import org.eclipse.emf.common.util.TreeIterator;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.xmi.XMIResource;
import org.eclipse.m2m.internal.qvt.oml.library.Context;
import org.eclipse.papyrus.uml.m2m.qvto.common.utils.TraceHelper;
import org.eclipse.uml2.uml.util.UMLUtil;

/**
 * This class allows to preserve (and create) XMI identifiers to have same transformation results when transformations are done several time for a same project.
 */
@SuppressWarnings("restriction")
public class PreserveXMIIDHelper {

	/**
	 * The context of the QVTo transformation.
	 */
	private Context context;

	/**
	 * The helper to use to manipulate QVTo trace.
	 */
	private TraceHelper helper = new TraceHelper();

	/**
	 * Constructor.
	 *
	 * @param context
	 *            The context of the QVTo transformation.
	 */
	public PreserveXMIIDHelper(final Context context) {
		this.context = context;
	}

	/**
	 * This allows to keep (and create) XMI identifiers for the UML Resource elements.
	 * 
	 * @param res
	 *            The UML Resource.
	 * @param oldIds
	 *            The existing objects and their identifiers.
	 */
	public void keepIdForUMLResource(final XMIResource res, final Map<EObject, String> oldIds) {

		// The list of stereotype applications that will be managed in a second run
		final Set<EObject> eObjectForSecondRun = new HashSet<EObject>();

		// Loop the first time for the non stereotype application
		final TreeIterator<EObject> iter = res.getAllContents();
		while (iter.hasNext()) {
			final EObject current = iter.next();

			if (isStereotypeApplication(current)) {

				// looking for the SysML1.1 object in the QVto trace
				final Object result = helper.traceFrom(context, current, null);

				if (oldIds.containsKey(result)) {
					// Get the old if of stereotype and apply it to the new one
					final String oldId = oldIds.get(result);
					res.setID(current, oldId);

					// Calculate if more than the stereotype application must be needed for the ID calculation
					SysMLXMIIDHelper.calculateMoreNeededId(res, current, oldId, oldIds);
				} else {
					// Add the stereotype application to the list that will be managed in a second run because they are created
					eObjectForSecondRun.add(current);
				}

			} else {
				// Calculate if more than the stereotype application must be needed for the ID calculation
				UMLXMIIDHelper.calculateNeededId(res, current, oldIds);
			}
		}

		// Second run the needed objects
		for (final EObject current : eObjectForSecondRun) {
			if (!oldIds.containsKey(current)) {
				// If the object is not an existing one, check if this is a SysML stereotyped created element
				if (SysMLXMIIDHelper.isStereotypedElementCreated(current)) {
					SysMLXMIIDHelper.calculateCreateStereotypedElement(res, current);

					// If the object is not an existing one, check if this is a UML stereotyped created element
				} else if (UMLXMIIDHelper.isStereotypedElementCreated(current)) {
					UMLXMIIDHelper.calculateCreateStereotypedElement(res, current);

				} else {
					System.out.println("It is not possible to found an id for " + current.toString()); //$NON-NLS-1$
				}
			}
		}
	}

	/**
	 * This allows to keep (and create) XMI identifiers for the Notation Resource elements.
	 * 
	 * @param res
	 *            The Notation Resource.
	 * @param oldIds
	 *            The existing objects and their identifiers.
	 */
	public void keepIdForNotationResource(final XMIResource res, final Map<EObject, String> oldIds) {

		// Loop the first time for the non stereotype application
		final TreeIterator<EObject> iter = res.getAllContents();
		while (iter.hasNext()) {
			final EObject current = iter.next();
			NotationXMIIDHelper.calculateNeededId(res, current, oldIds);
		}
	}

	/**
	 * This allows to determinate if the object is a stereotype application.
	 * 
	 * @param eobject
	 *            The eobject to check.
	 * @return
	 * 		<code>true</code> when the element represents a stereotype application, <code>false</code> otherwise.
	 */
	protected boolean isStereotypeApplication(final EObject eobject) {
		return null != UMLUtil.getBaseElement(eobject);
	}


}