EDIT

// $Id$

/**

 * Copyright (C) 2007 EDIT

 * European Distributed Institute of Taxonomy 

 * http://www.e-taxonomy.eu

 * 

 * The contents of this file are subject to the Mozilla Public License Version 1.1

 * See LICENSE.TXT at the top of this package for the full license terms.

 */

package eu.etaxonomy.cdm.api.application;

import java.util.List;

import java.util.UUID;

import org.apache.log4j.Logger;

import org.hibernate.SessionFactory;

import org.springframework.beans.MutablePropertyValues;

import org.springframework.beans.factory.config.BeanDefinition;

import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;

import org.springframework.context.support.AbstractApplicationContext;

import org.springframework.context.support.GenericApplicationContext;

import org.springframework.core.io.ClassPathResource;

import org.springframework.core.io.Resource;

import org.springframework.security.authentication.ProviderManager;

import org.springframework.transaction.PlatformTransactionManager;

import org.springframework.transaction.TransactionDefinition;

import org.springframework.transaction.TransactionStatus;

import org.springframework.transaction.support.DefaultTransactionDefinition;

import eu.etaxonomy.cdm.api.application.eclipse.EclipseRcpSaveGenericApplicationContext;

import eu.etaxonomy.cdm.api.conversation.ConversationHolder;

import eu.etaxonomy.cdm.api.service.IAgentService;

import eu.etaxonomy.cdm.api.service.ICollectionService;

import eu.etaxonomy.cdm.api.service.ICommonService;

import eu.etaxonomy.cdm.api.service.IDatabaseService;

import eu.etaxonomy.cdm.api.service.IDescriptionService;

import eu.etaxonomy.cdm.api.service.IFeatureTreeService;

import eu.etaxonomy.cdm.api.service.ILocationService;

import eu.etaxonomy.cdm.api.service.IMediaService;

import eu.etaxonomy.cdm.api.service.INameService;

import eu.etaxonomy.cdm.api.service.IOccurrenceService;

import eu.etaxonomy.cdm.api.service.IReferenceService;

import eu.etaxonomy.cdm.api.service.IService;

import eu.etaxonomy.cdm.api.service.ITaxonNodeService;

import eu.etaxonomy.cdm.api.service.ITaxonService;

import eu.etaxonomy.cdm.api.service.ITaxonTreeService;

import eu.etaxonomy.cdm.api.service.ITermService;

import eu.etaxonomy.cdm.api.service.IUserService;

import eu.etaxonomy.cdm.api.service.IVocabularyService;

import eu.etaxonomy.cdm.database.CdmPersistentDataSource;

import eu.etaxonomy.cdm.database.DataSourceNotFoundException;

import eu.etaxonomy.cdm.database.DbSchemaValidation;

import eu.etaxonomy.cdm.database.ICdmDataSource;

import eu.etaxonomy.cdm.model.common.CdmBase;

import eu.etaxonomy.cdm.model.common.CdmMetaData;

import eu.etaxonomy.cdm.model.common.DefinedTermBase;

import eu.etaxonomy.cdm.model.common.User;

import eu.etaxonomy.cdm.model.common.init.TermNotFoundException;

/**

 * @author a.mueller

 *

 */

public class CdmApplicationController {

	private static final Logger logger = Logger.getLogger(CdmApplicationController.class);

	public static final String DEFAULT_APPLICATION_CONTEXT_RESOURCE = "/eu/etaxonomy/cdm/defaultApplicationContext.xml";

	public AbstractApplicationContext applicationContext;

	private ICdmApplicationConfiguration configuration; 

	private Resource applicationContextResource;

	final static DbSchemaValidation defaultDbSchemaValidation = DbSchemaValidation.VALIDATE;

	/**

	 * Constructor, opens an spring 2.5 ApplicationContext by using the default data source

	 */

	public static CdmApplicationController NewInstance()  throws DataSourceNotFoundException, TermNotFoundException {

		logger.info("Start CdmApplicationController with default data source");

		CdmPersistentDataSource dataSource = CdmPersistentDataSource.NewDefaultInstance();

		DbSchemaValidation dbSchemaValidation = defaultDbSchemaValidation;

		return new CdmApplicationController(null, dataSource, dbSchemaValidation, false);

	}

	/**

	 * Constructor, opens an spring 2.5 ApplicationContext by using the default data source

	 * @param dbSchemaValidation validation type for database schema

	 */

	public static CdmApplicationController NewInstance(DbSchemaValidation dbSchemaValidation)  throws DataSourceNotFoundException, TermNotFoundException {

		logger.info("Start CdmApplicationController with default data source");

		CdmPersistentDataSource dataSource = CdmPersistentDataSource.NewDefaultInstance();

		if (dbSchemaValidation == null){

			dbSchemaValidation = defaultDbSchemaValidation;

		}

		return new CdmApplicationController(null, dataSource, dbSchemaValidation, false);

	}

	/**

	 * Constructor, opens an spring 2.5 ApplicationContext by using the according data source and the

	 * default database schema validation type

	 * @param dataSource

	 */

	public static CdmApplicationController NewInstance(ICdmDataSource dataSource) 

	throws DataSourceNotFoundException, TermNotFoundException{

		return new CdmApplicationController(null, dataSource, defaultDbSchemaValidation, false);

	}

	public static CdmApplicationController NewInstance(ICdmDataSource dataSource, DbSchemaValidation dbSchemaValidation) 

	throws DataSourceNotFoundException, TermNotFoundException{

		return new CdmApplicationController(null, dataSource, dbSchemaValidation, false);

	}

	public static CdmApplicationController NewInstance(ICdmDataSource dataSource, DbSchemaValidation dbSchemaValidation, boolean omitTermLoading) 

	throws DataSourceNotFoundException, TermNotFoundException{

		return new CdmApplicationController(null, dataSource, dbSchemaValidation, omitTermLoading);

	}

	public static CdmApplicationController NewInstance(Resource applicationContextResource, ICdmDataSource dataSource, DbSchemaValidation dbSchemaValidation, boolean omitTermLoading) 

	throws DataSourceNotFoundException, TermNotFoundException{

		return new CdmApplicationController(applicationContextResource, dataSource, dbSchemaValidation, omitTermLoading);

	}

	/**

	 * Constructor, opens an spring 2.5 ApplicationContext by using the according data source

	 * @param dataSource

	 * @param dbSchemaValidation

	 * @param omitTermLoading

	 */

	private CdmApplicationController(Resource applicationContextResource, ICdmDataSource dataSource, DbSchemaValidation dbSchemaValidation, boolean omitTermLoading){

		logger.info("Start CdmApplicationController with datasource: " + dataSource.getName());

		if (applicationContextResource != null){

			this.applicationContextResource = applicationContextResource;

		}else{

			this.applicationContextResource = new ClassPathResource(DEFAULT_APPLICATION_CONTEXT_RESOURCE);

		}

		setNewDataSource(dataSource, dbSchemaValidation, omitTermLoading);

//		if (setNewDataSource(dataSource, dbSchemaValidation, omitTermLoading) == false){

//			throw new DataSourceNotFoundException("Wrong datasource: " + dataSource );

//		}

	}

	/**

	 * Sets the application context to a new spring ApplicationContext by using the according data source and initializes the Controller.

	 * @param dataSource

	 */

	private boolean setNewDataSource(ICdmDataSource dataSource, DbSchemaValidation dbSchemaValidation, boolean omitTermLoading){

		if (dbSchemaValidation == null){

			dbSchemaValidation = defaultDbSchemaValidation;

		}

		logger.info("Connecting to '" + dataSource.getName() + "'");

		GenericApplicationContext appContext;

//		try {

			appContext = new EclipseRcpSaveGenericApplicationContext();

			BeanDefinition datasourceBean = dataSource.getDatasourceBean();

			datasourceBean.setAttribute("isLazy", false);

			appContext.registerBeanDefinition("dataSource", datasourceBean);

			BeanDefinition hibernatePropBean= dataSource.getHibernatePropertiesBean(dbSchemaValidation);

			appContext.registerBeanDefinition("hibernateProperties", hibernatePropBean);

			XmlBeanDefinitionReader xmlReader = new XmlBeanDefinitionReader(appContext);

			xmlReader.loadBeanDefinitions(this.applicationContextResource);		 

			//omitTerms

			String initializerName = "persistentTermInitializer";

			BeanDefinition beanDef = appContext.getBeanDefinition(initializerName);

			MutablePropertyValues values = beanDef.getPropertyValues();

			values.addPropertyValue("omit", omitTermLoading);

			appContext.refresh();

			appContext.start();

		setApplicationContext(appContext);

		//initialize user and metaData for new databases

		int userCount = getUserService().count(User.class);

		if (userCount == 0 ){

			createAdminUser();

		}

		int metaDataCount = getCommonService().getCdmMetaData().size();

		if (metaDataCount == 0){

			createMetadata();

		}

		return true;

	}

	private void createAdminUser(){

		User firstUser = User.NewInstance("admin", "0000");

		getUserService().save(firstUser);

		logger.info("Admin user created.");

	}

	private void createMetadata(){

		List<CdmMetaData> metaData = CdmMetaData.defaultMetaData();

		getCommonService().saveAllMetaData(metaData);

		logger.info("Metadata created.");

	}

	/**

	 * Tests if some DefinedTermsAreMissing.

	 * @return true, if at least one is missing, else false

	 */

	public boolean testDefinedTermsAreMissing(){

		UUID englishUuid = UUID.fromString("e9f8cdb7-6819-44e8-95d3-e2d0690c3523");

		DefinedTermBase<?> english = this.getTermService().getByUri(englishUuid.toString());

		if ( english == null || ! english.getUuid().equals(englishUuid)){

			return true;

		}else{

			return false;

		}

	}

	/**

	 * Changes the ApplicationContext to the new dataSource

	 * @param dataSource

	 */

	public boolean changeDataSource(ICdmDataSource dataSource){

		//logger.info("Change datasource to : " + dataSource);

		return setNewDataSource(dataSource, DbSchemaValidation.VALIDATE, false);

	}

	/**

	 * Changes the ApplicationContext to the new dataSource

	 * @param dataSource

	 * @param dbSchemaValidation

	 */

	public boolean changeDataSource(ICdmDataSource dataSource, DbSchemaValidation dbSchemaValidation){

		//logger.info("Change datasource to : " + dataSource);

		return setNewDataSource(dataSource, dbSchemaValidation, false);

	}

	/**

	 * Changes the ApplicationContext to the new dataSource

	 * @param dataSource

	 * @param dbSchemaValidation

	 * @param omitTermLoading

	 */

	public boolean changeDataSource(ICdmDataSource dataSource, DbSchemaValidation dbSchemaValidation, boolean omitTermLoading){

		logger.info("Change datasource to : " + dataSource);

		return setNewDataSource(dataSource, dbSchemaValidation, omitTermLoading);

	}

	/**

	 * Sets a new application Context.

	 * @param ac

	 */

	public void setApplicationContext(AbstractApplicationContext ac){

		closeApplicationContext(); //closes old application context if necessary

		applicationContext = ac;

		applicationContext.registerShutdownHook();

		init();

	}

	/* (non-Javadoc)

	 * @see java.lang.Object#finalize()

	 */

	public void finalize(){

		close();

	}

	/**

	 * closes the application

	 */

	public void close(){

		closeApplicationContext();

	}

	/**

	 * closes the application context

	 */

	private void closeApplicationContext(){

		if (applicationContext != null){

			logger.info("Close ApplicationContext");

			applicationContext.close();

		}

	}

	private void init(){

		logger.debug("Init " +  this.getClass().getName() + " ... ");

		if (logger.isDebugEnabled()){for (String beanName : applicationContext.getBeanDefinitionNames()){ logger.debug(beanName);}}

		//TODO delete next row (was just for testing)

		if (logger.isInfoEnabled()){

			logger.info("Registered Beans: ");

			String[] beans = applicationContext.getBeanDefinitionNames();

			for (String bean:beans){

				logger.info(bean);

			}

		}

		configuration = (ICdmApplicationConfiguration)applicationContext.getBean("cdmApplicationDefaultConfiguration");

		getDatabaseService().setApplicationController(this);

	}

	/* ******  Services *********/

	public final INameService getNameService(){

		return configuration.getNameService();

	}

	public final ITaxonService getTaxonService(){

		return configuration.getTaxonService();

	}

	public final ITaxonTreeService getTaxonTreeService(){

		return configuration.getTaxonTreeService();

	}

	public final ITaxonNodeService getTaxonNodeService(){

		return configuration.getTaxonNodeService();

	}

	public final IReferenceService getReferenceService(){

		return configuration.getReferenceService();

	}

	public final IAgentService getAgentService(){

		return configuration.getAgentService();

	}

	public final IDatabaseService getDatabaseService(){

		return configuration.getDatabaseService();

	}

	public final ITermService getTermService(){

		return configuration.getTermService();

	}

	public final IDescriptionService getDescriptionService(){

		return configuration.getDescriptionService();

	}

	public final IOccurrenceService getOccurrenceService(){

		return configuration.getOccurrenceService();

	}

	public final IMediaService getMediaService(){

		return configuration.getMediaService();

	}

	public final ICommonService getCommonService(){

		return configuration.getCommonService();

	}

	public final ILocationService getLocationService(){

		return configuration.getLocationService();

	}

	public final IUserService getUserService(){

		return configuration.getUserService();

	}

	public final ICollectionService getCollectionService(){

		return configuration.getCollectionService();

	}

	public final IFeatureTreeService getFeatureTreeService(){

		return configuration.getFeatureTreeService();

	}

	public final IVocabularyService getVocabularyService(){

		return configuration.getVocabularyService();

	}	

	public final IService<CdmBase> getMainService(){

		return configuration.getMainService();

	}

	public final ConversationHolder NewConversation(){

		//return (ConversationHolder)applicationContext.getBean("conversationHolder");

		return configuration.NewConversation();

	}

	public final ProviderManager getAuthenticationManager(){

		return configuration.getAuthenticationManager();

	}

	public final Object getBean(String name){

		return this.applicationContext.getBean(name);

	}

	/*

	 * OLD TRANSACTION STUFF 

	 */

	/* **** flush ***********/

	public void flush() {

		SessionFactory sf = (SessionFactory)applicationContext.getBean("sessionFactory");

		sf.getCurrentSession().flush();

	}

	public SessionFactory getSessionFactory(){

		return (SessionFactory)applicationContext.getBean("sessionFactory");

	}

	public TransactionStatus startTransaction() {

		return startTransaction(false);

	}

	public TransactionStatus startTransaction(Boolean readOnly) {

		PlatformTransactionManager txManager = configuration.getTransactionManager();

		DefaultTransactionDefinition defaultTxDef = new DefaultTransactionDefinition();

		defaultTxDef.setReadOnly(readOnly);

		TransactionDefinition txDef = defaultTxDef;

		// Log some transaction-related debug information.

		if (logger.isDebugEnabled()) {

			logger.debug("Transaction name = " + txDef.getName());

			logger.debug("Transaction facets:");

			logger.debug("Propagation behavior = " + txDef.getPropagationBehavior());

			logger.debug("Isolation level = " + txDef.getIsolationLevel());

			logger.debug("Timeout = " + txDef.getTimeout());

			logger.debug("Read Only = " + txDef.isReadOnly());

			// org.springframework.orm.hibernate3.HibernateTransactionManager

			// provides more transaction/session-related debug information.

		}

		TransactionStatus txStatus = txManager.getTransaction(txDef);

		return txStatus;

	}

	public void commitTransaction(TransactionStatus txStatus){

		PlatformTransactionManager txManager = configuration.getTransactionManager();

		txManager.commit(txStatus);

		return;

	}

}