/*******************************************************************************
 * Copyright (c) 2008, 2009 Oracle. 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:
 *     Oracle - initial API and implementation
 *******************************************************************************/
package org.eclipse.jpt.core.internal.operations;

import java.util.Iterator;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IFolder;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Path;
import org.eclipse.jem.util.emf.workbench.ProjectUtilities;
import org.eclipse.jpt.core.JpaProject;
import org.eclipse.jpt.core.JptCorePlugin;
import org.eclipse.jpt.core.context.persistence.MappingFileRef;
import org.eclipse.jpt.core.context.persistence.Persistence;
import org.eclipse.jpt.core.context.persistence.PersistenceUnit;
import org.eclipse.jpt.core.context.persistence.PersistenceXml;
import org.eclipse.jpt.core.internal.resource.orm.OrmXmlResourceProvider;
import org.eclipse.jpt.core.resource.AbstractXmlResourceProvider;
import org.eclipse.jpt.core.resource.orm.AccessType;
import org.eclipse.jpt.core.resource.orm.OrmFactory;
import org.eclipse.jpt.core.resource.orm.XmlEntityMappings;
import org.eclipse.jpt.core.resource.orm.XmlPersistenceUnitDefaults;
import org.eclipse.jpt.core.resource.orm.XmlPersistenceUnitMetadata;
import org.eclipse.jpt.core.resource.xml.JpaXmlResource;
import org.eclipse.wst.common.frameworks.datamodel.AbstractDataModelOperation;
import org.eclipse.wst.common.frameworks.datamodel.IDataModel;

public class OrmFileCreationOperation extends AbstractDataModelOperation
	implements OrmFileCreationDataModelProperties
{
	public OrmFileCreationOperation(IDataModel dataModel) {
		super(dataModel);
	}
	
	
	@Override
	public IStatus execute(IProgressMonitor monitor, IAdaptable info) throws ExecutionException {
		// Create source folder if it does not exist
		IFolder folder = createSourceFolder();
		// Create orm file
		IFile file = createMappingFile(folder);
		// Add orm file to persistence unit if specified
		addMappingFileToPersistenceXml(file);
		return OK_STATUS;
	}
	
	protected IProject getProject() throws ExecutionException {
		String projectName = (String) getDataModel().getProperty(PROJECT_NAME);
		IProject project = ProjectUtilities.getProject(projectName);
		if (project == null) {
			throw new ExecutionException("No project name specified"); //$NON-NLS-1$
		}
		return project;
	}
	
	protected JpaProject getJpaProject() throws ExecutionException {
		IProject project = getProject();
		JpaProject jpaProject = JptCorePlugin.getJpaProject(project);
		if (jpaProject == null) {
			throw new ExecutionException("Project does not have JPA content"); //$NON-NLS-1$
		}
		return jpaProject;
	}
	
	protected PersistenceUnit getPersistenceUnit() throws ExecutionException {
		String pUnitName = getDataModel().getStringProperty(PERSISTENCE_UNIT);
		JpaProject jpaProject = getJpaProject();
		PersistenceXml persistenceXml = jpaProject.getRootContextNode().getPersistenceXml();
		if (persistenceXml == null) {
			throw new ExecutionException("Project does not have a persistence.xml file"); //$NON-NLS-1$
		}
		Persistence persistence = persistenceXml.getPersistence();
		if (persistence == null) {
			throw new ExecutionException("persistence.xml does not have a persistence node."); //$NON-NLS-1$
		}
		for (Iterator<PersistenceUnit> stream = persistence.persistenceUnits(); stream.hasNext(); ) {
			PersistenceUnit pUnit = stream.next();
			if (pUnitName.equals(pUnit.getName())) {
				return pUnit;
			}
		}
		throw new ExecutionException("persistence.xml does not have persistence unit named \'" + pUnitName + "\'"); //$NON-NLS-1$
	}
	
	/**
	 * This method will return the source folder as specified in the data model. 
	 * It will create the source folder if it does not exist. It will not add
	 * it as a source folder to the project build path if it is not already.
	 * This method may return null.
	 */
	// copied from NewJavaClassOperation
	protected IFolder createSourceFolder() throws ExecutionException {
		// Get the source folder name from the data model
		String folderPath = model.getStringProperty(SOURCE_FOLDER);
		IProject project = getProject();
		IFolder folder = project.getWorkspace().getRoot().getFolder(new Path(folderPath));
		// If folder does not exist, create the folder with the specified path
		if (! folder.exists()) {
			try {
				folder.create(true, true, null);
			} catch (CoreException e) {
				throw new ExecutionException("Could not create folder", e); //$NON-NLS-1$
			}
		}
		// Return the source folder
		return folder;
	}
	
	protected IFile createMappingFile(IFolder folder) {
		String filePath = getDataModel().getStringProperty(FILE_PATH);
		IFile file = folder.getFile(new Path(filePath));
		final AbstractXmlResourceProvider resourceProvider = getXmlResourceProvider(file);
		final JpaXmlResource xmlResource;
		try {
			xmlResource = resourceProvider.createFileAndResource();
		}
		catch (CoreException e) {
			JptCorePlugin.log(e);
			return null;
		}
		xmlResource.modify(new Runnable() {
				public void run() {
					AccessType defaultAccess = (AccessType) getDataModel().getProperty(DEFAULT_ACCESS); 
					if (defaultAccess != null) {
						XmlPersistenceUnitMetadata puMetadata = createXmlPersistenceUnitMetadata();
						((XmlEntityMappings) xmlResource.getRootObject()).setPersistenceUnitMetadata(puMetadata);
						XmlPersistenceUnitDefaults puDefaults = createXmlPersistenceUnitDefaults();
						puMetadata.setPersistenceUnitDefaults(puDefaults);
						puDefaults.setAccess(defaultAccess);
					}
				}
			});
		return file;
	}
	
	protected XmlPersistenceUnitMetadata createXmlPersistenceUnitMetadata() {
		return OrmFactory.eINSTANCE.createXmlPersistenceUnitMetadata();
	}
	
	protected XmlPersistenceUnitDefaults createXmlPersistenceUnitDefaults() {
		return OrmFactory.eINSTANCE.createXmlPersistenceUnitDefaults();
	}
	
	protected AbstractXmlResourceProvider getXmlResourceProvider(IFile file) {
		return OrmXmlResourceProvider.getXmlResourceProvider(file);
	}
	
	protected void addMappingFileToPersistenceXml(IFile file) throws ExecutionException {
		if (! getDataModel().getBooleanProperty(ADD_TO_PERSISTENCE_UNIT)) {
			return;
		}
		JpaProject jpaProject = JptCorePlugin.getJpaProject(file.getProject());
		JpaXmlResource resource = jpaProject.getPersistenceXmlResource();
	
		final PersistenceUnit pUnit = getPersistenceUnit();
		
		resource.modify(new Runnable() {
			public void run() {
				String filePath = getDataModel().getStringProperty(FILE_PATH);
				for (Iterator<MappingFileRef> stream = pUnit.specifiedMappingFileRefs(); stream.hasNext(); ) {
					if (filePath.equals(stream.next().getFileName())) {
						return;
					}
				}
				MappingFileRef mfRef = pUnit.addSpecifiedMappingFileRef();
				mfRef.setFileName(new Path(filePath).toPortableString());
			}
		});
	}
}