/*******************************************************************************
 * Copyright (c) 2008, 2012 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.eclipse.emf.eef.codegen.services;

import org.eclipse.emf.codegen.ecore.genmodel.GenModel;
import org.eclipse.emf.codegen.util.ImportManager;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;

/**
 * This class is used to implement some behaviors regarding GenModels that cannot be properly implemented with
 * acceleo alone.
 * 
 * @author <a href="mailto:stephane.bouchet@obeo.fr">Stephane Bouchet</a>
 * @author <a href="mailto:william.piers@obeo.fr">William Piers</a>
 */
public class ImportService {

	/**
	 * Initializing EMF importManager.
	 * 
	 * @since 1.1
	 */
	public void initializeImportManager(EObject caller, String packageName, String className) {
		ImportManager importManager = new ImportManager(packageName, className);
		getGenModel(caller).setImportManager(importManager);
	}
	
	/**
	 * Initializing EMF importManager on a genmodel.
	 * To fix call of import manager in a genmodel which is not the genmodel used by the default import manager
	 */
	public void initializeImportManagerForGenmodel(EObject caller, GenModel model, String packageName, String className) {
		ImportManager importManager = new ImportManager(packageName, className);
		model.setImportManager(importManager);
	}

	/**
	 * Adds an import.
	 */
	public void addImport(EObject caller, String qualifiedName) {
		GenModel genModel = getGenModel(caller);
		genModel.addImport(qualifiedName);
	}

	/**
	 * Generate sorted imports.
	 * 
	 * @since 1.1
	 */
	public String genSortedImports(EObject caller) {
		return getGenModel(caller).getImportManager().computeSortedImports();
	}

	/**
	 * Retrieves the genModel from any EObject from the components model.
	 * 
	 * @param eo
	 *            any EObject from the components model.
	 * @return the EMF genModel (intended to hold the ImportManager)
	 */
	public GenModel getGenModel(EObject eo) {
		if (eo.eResource() != null && eo.eResource().getResourceSet() != null) {
			for (Resource resource : eo.eResource().getResourceSet().getResources()) {
				if (!resource.getContents().isEmpty() && resource.getContents().get(0) instanceof GenModel) {
					return (GenModel)resource.getContents().get(0);
				}
			}
		}
		throw new RuntimeException("Unable to retrieve gen model from " + eo);
	}
	
	/**
	 * @deprecated. EEF is using EMF importmanager directy.
	 * @param cur
	 *            the current Eobject
	 * @return the importmarker string
	 */
	public String getImports(EObject cur) {
		return "";
	}
}