/*

 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). 

 * All rights reserved.

 * This component and the accompanying materials are made available

 * under the terms of the License "Symbian Foundation License v1.0"

 * which accompanies this distribution, and is available

 * at the URL "http://www.symbianfoundation.org/legal/sfl-v10.html".

 * 

 * Initial Contributors:

 * Nokia Corporation - Initial contribution

 * 

 * Contributors:

 * 

 * Description: This file is part of com.nokia.tools.variant.confml.core component.

 */

package com.nokia.tools.variant.confml.internal.core;

import java.util.Collections;

import java.util.List;

import org.eclipse.core.resources.IProject;

import org.eclipse.core.resources.IResource;

import org.eclipse.core.runtime.CoreException;

import org.eclipse.core.runtime.IPath;

import org.eclipse.core.runtime.Path;

import org.eclipse.emf.common.util.URI;

import org.eclipse.emf.ecore.resource.ContentHandler;

import org.eclipse.emf.ecore.resource.Resource;

import org.eclipse.emf.ecore.resource.URIHandler;

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

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

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

import org.eclipse.emf.transaction.RecordingCommand;

import org.eclipse.emf.transaction.TransactionalEditingDomain;

import org.eclipse.emf.transaction.TransactionalEditingDomain.Registry;

import com.nokia.tools.variant.confml.core.ConfMLCore;

import com.nokia.tools.variant.confml.core.model.application.EConfMLLayer;

import com.nokia.tools.variant.confml.core.model.application.EConfigurationProject;

import com.nokia.tools.variant.confml.core.model.core.EConfmlRootFactory;

import com.nokia.tools.variant.confml.core.model.core.EWorkspaceModel;

public class ModelManager {

	static private ModelManager INSTANCE;

	private TransactionalEditingDomain editingDomain;

	private final Resource resource;

	private final EWorkspaceModel workspaceModel;

	public static synchronized ModelManager getModelManager() {

		if (INSTANCE == null) {

			INSTANCE = new ModelManager();

		}

		return INSTANCE;

	}

	private ModelManager() {

		try {

			resource = new ResourceImpl(URI.createURI("confml:///"));

			workspaceModel = EConfmlRootFactory.eINSTANCE

					.createEWorkspaceModel();

			resource.getContents().add(workspaceModel);

			editingDomain = Registry.INSTANCE

					.getEditingDomain("com.nokia.tools.variant.confml.core.ConfMLModelDomain");

			List<URIHandler> handlers = Collections

					.singletonList((URIHandler) new PlatformResourceURIHandlerImpl());

			editingDomain.getResourceSet()

					.setURIConverter(

							new ExtensibleURIConverterImpl(handlers,

									ContentHandler.Registry.INSTANCE

											.contentHandlers()));

			editingDomain.getCommandStack().execute(

					new RecordingCommand(editingDomain) {

						@Override

						protected void doExecute() {

							editingDomain.getResourceSet().getResources().add(

									resource);

						}

					});

			editingDomain.getCommandStack().flush();

		} catch (Exception ex) {

			System.err.println("Error loading *************************");

			ex.printStackTrace();

			throw new RuntimeException(ex);

		}

	}

	public TransactionalEditingDomain getEditingDomain() {

		return editingDomain;

	}

	public EWorkspaceModel getWorkspaceModel() {

		return workspaceModel;

	}

	/**

	 * Simply find the project model from the root model

	 * 

	 * @param project

	 *            Project to find corresponding project model for

	 * @param monitor

	 *            Progress monitor

	 * @return Project model or <code>null</code>

	 * @throws CoreException

	 */

	public EConfigurationProject getProjectModel(IProject project) {

		return workspaceModel.getProjectMap().get(project.getName());

	}

	public Resource getResource() {

		return resource;

	}

	public EConfMLLayer getLayer(IResource resource) {

		if (resource instanceof IProject) {

			EConfigurationProject cp = getProjectModel((IProject) resource);

			return cp == null ? null : cp.getLastLayer();

		}

		EConfigurationProject project;

		project = ConfMLCore.getProjectModel(resource.getProject());

		if (project == null) {

			return null;

		}

		IPath resourcePath = resource.getFullPath();

		EConfMLLayer result = null;

		IPath resultPath = Path.EMPTY;

		for (EConfMLLayer layer : project.getLayers()) {

			URI layerURI = layer.getLayerURI();

			IPath path = new Path(layerURI.toPlatformString(true));

			if (path.matchingFirstSegments(resourcePath) == path.segmentCount()) {

				if (resultPath.segmentCount() < path.segmentCount()) {

					resultPath = path;

					result = layer;

				}

			}

		}

		return result;

	}

}