/*******************************************************************************
* Copyright (c) 2011, 2012 Montages A.G.
* 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:
* 	Guillaume Hillairet (Montages A.G.) : initial implementation
*******************************************************************************/
package org.eclipse.gmf.internal.bridge.genmodel;

import java.net.MalformedURLException;
import java.net.URL;

import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.emf.codegen.ecore.genmodel.GenModel;
import org.eclipse.emf.common.util.BasicEList;
import org.eclipse.emf.common.util.Diagnostic;
import org.eclipse.emf.common.util.EList;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EPackage;
import org.eclipse.emf.ecore.EPackage.Registry;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.gmf.codegen.gmfgen.GenEditorGenerator;
import org.eclipse.gmf.internal.bridge.VisualIdentifierDispenser;
import org.eclipse.gmf.mappings.Mapping;
import org.eclipse.m2m.internal.qvt.oml.InternalTransformationExecutor;
import org.eclipse.m2m.internal.qvt.oml.trace.Trace;
import org.eclipse.m2m.qvt.oml.BasicModelExtent;
import org.eclipse.m2m.qvt.oml.ExecutionContext;
import org.eclipse.m2m.qvt.oml.ExecutionDiagnostic;
import org.eclipse.m2m.qvt.oml.ModelExtent;

/**
 * @since 2.0
 */
@SuppressWarnings("restriction")
public class QVTDiagramGenModelTransformer {
	
	private final static String myTransfPath = "platform:/plugin/org.eclipse.gmf.bridge/transforms/Map2Gen.qvto";
	private URI myTransfURI;
	private Trace myTrace;
	private final ResourceSet myResourceSet;
	private Registry myRegistry;
	
	public QVTDiagramGenModelTransformer(ResourceSet resourceSet, VisualIdentifierDispenser idDespenser) {
		myResourceSet = resourceSet;
		VisualIdentifierDispenserFacade.Provider.setDispenser(idDespenser);
	}
	
	public static URL getDefaultTransformation() {
		try {
			return new URL(myTransfPath);
		} catch (MalformedURLException e) {
			e.printStackTrace();
		}
		return null;
	}
	
	public ExecutionDiagnostic transform(final Mapping m, final GenModel genModel, final ModelExtent output, final ExecutionContext context) {
		final Resource trace = m.eResource() == null ? myResourceSet.createResource(URI.createURI("trace.qvtotrace")) : myResourceSet.createResource(
				m.eResource().getURI().trimFileExtension().appendFileExtension("qvtotrace"));
		
		final InternalTransformationExecutor executor = new InternalTransformationExecutor(getTransformation()) {
			@Override
			protected void handleExecutionTraces(Trace traces) {
				super.handleExecutionTraces(traces);
				trace.getContents().add(traces);
			}
		};
		RuntimeGenModelAccess runtimeAccess = new RuntimeGenModelAccess();
		runtimeAccess.ensure();
		
		final ExecutionDiagnostic result = executor.execute(context, 
				getModelExtent(m), 
				getModelExtent(genModel), 
				getModelExtent(runtimeAccess.genPackage().getGenModel()), 
				output);
		
		this.myTrace = trace.getContents().isEmpty() ? null : (Trace) trace.getContents().get(0);
		
		return result;
	}
	
	public void setRegistry(EPackage.Registry registry) {
		this.myRegistry = registry;
	}
	
	public ExecutionDiagnostic transform(final Mapping m, final GenModel genModel, ModelExtent output, final ExecutionContext context, final URI... extensions) {
		ExecutionDiagnostic result = transform(m, genModel, output, context);
		if (Diagnostic.OK != result.getSeverity()) {
			return result;
		}
		
		GenEditorGenerator outputGenModel = null;
		if (output.getContents().size() == 1 && output.getContents().get(0) instanceof GenEditorGenerator) {
			outputGenModel = (GenEditorGenerator) output.getContents().get(0);
		}
		if (outputGenModel == null) {
			return result;
		}
		
		output = getModelExtent(outputGenModel);
		for (URI extension: extensions) {
			final InternalTransformationExecutor exec = myRegistry == null ? 
					new InternalTransformationExecutor(extension) : new InternalTransformationExecutor(extension, myRegistry);
			exec.loadTransformation(new NullProgressMonitor());

			if (1 == exec.getTransformation().getModelParameter().size()) {
				result = exec.execute(context, output);
			} else {
				result = exec.execute(context, getModelExtent(m), getModelExtent(myTrace), output);
			}
		}
		
		return result;
	}
	
	public Trace getTrace() {
		return myTrace;
	}
	
	private BasicModelExtent getModelExtent(EObject rootObject) {
		final EList<EObject> mapObjects = new BasicEList<EObject>();
		mapObjects.add(rootObject);
		return new BasicModelExtent(mapObjects);
	}

	public void setTransformationL(URL mainTransformation) {
		myTransfURI = URI.createURI(mainTransformation.toString());
	}
	
	public URI getTransformation() {
		if (myTransfURI == null) {
			myTransfURI = URI.createURI(myTransfPath);
		}
		return myTransfURI;
	}
}