/*******************************************************************************
 * Copyright (c) 2011 Obeo.
 * 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:
 *     Obeo - initial API and implementation
 *******************************************************************************/
package org.obeonetwork.dsl.database.design.services;

import org.eclipse.emf.ecore.EObject;

import fr.obeo.acceleo.gen.template.eval.ENode;
import fr.obeo.acceleo.gen.template.eval.ENodeCastException;
import fr.obeo.dsl.common.tools.api.interpreter.IInterpreter;
import fr.obeo.dsl.viewpoint.tools.api.interpreter.InterpreterUtil;

/**
 * Class used to debug
 * @author Stephane Thibaudeau <stephane.thibaudeau@obeo.fr>
 *
 */
public class DebugServices {

	/**
	 * Outputs information on the parameter and acceleo variables available
	 * @param context Object we wish to debug
	 * @return The unmodified parameter
	 */
	public ENode traceWithVariables(ENode context) {
		System.out.println("$self : " + context);
		EObject interpreterContext = getAnEObjectFrom(context);
		if (interpreterContext != null) {
			IInterpreter interpreter = InterpreterUtil.getInterpreter(interpreterContext);
			for (String variableName : interpreter.getVariables().keySet()) {
				System.out.println("$" + variableName + " : " + interpreter.getVariables().get(variableName));
			}
		}
		System.out.println("--------------------");
		return context;
	}
	
	/**
	 * Extracts an EObject from an ENode instance
	 * @param context ENode instance
	 * @return an EObject if one has been found
	 */
	private EObject getAnEObjectFrom(ENode context) {
		EObject result = null;
		try {
			if (context.isEObject()) {
				return context.getEObject();
			} else if (context.isList() && context.getList().size() > 0) {
				// We search into the list elements
				for (Object elem : context.getList().asList()) {
					if (elem instanceof ENode) {
						ENode enode = (ENode)elem;
						if (enode.isEObject()) {
							return enode.getEObject();
						}
					}
				}
				// If we have found nothing, we search if some elements of the list are a list themselves
				for (Object elem : context.getList().asList()) {
					if (elem instanceof ENode) {
						ENode enode = (ENode)elem;
						if (enode.isList()) {
							EObject tempResult = getAnEObjectFrom(enode);
							if (tempResult != null) {
								return tempResult;
							}
						}
					}
				}
			}
		} catch (ENodeCastException e) {
		}
		return result;
	}
}