/*
 * JBoss, Home of Professional Open Source.
 * See the COPYRIGHT.txt file distributed with this work for information
 * regarding copyright ownership.  Some portions may be licensed
 * to Red Hat, Inc. under one or more contributor license agreements.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 */
package org.teiid.jboss;

import java.io.IOException;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Executor;
import java.util.concurrent.TimeUnit;

import javax.script.ScriptEngineManager;

import org.jboss.as.controller.ModelController;
import org.jboss.as.naming.deployment.ContextNames;
import org.jboss.as.server.Services;
import org.jboss.as.server.deployment.Attachments;
import org.jboss.as.server.deployment.DeploymentPhaseContext;
import org.jboss.as.server.deployment.DeploymentUnit;
import org.jboss.as.server.deployment.DeploymentUnitProcessingException;
import org.jboss.as.server.deployment.DeploymentUnitProcessor;
import org.jboss.modules.ModuleClassLoader;
import org.jboss.msc.service.*;
import org.jboss.msc.service.ServiceBuilder.DependencyType;
import org.jboss.msc.service.ServiceController.Mode;
import org.jboss.msc.service.ServiceController.State;
import org.jboss.msc.value.InjectedValue;
import org.jboss.vfs.VirtualFile;
import org.teiid.adminapi.Model;
import org.teiid.adminapi.Translator;
import org.teiid.adminapi.VDBImport;
import org.teiid.adminapi.impl.ModelMetaData;
import org.teiid.adminapi.impl.SourceMappingMetadata;
import org.teiid.adminapi.impl.VDBMetaData;
import org.teiid.adminapi.impl.VDBTranslatorMetaData;
import org.teiid.common.buffer.BufferManager;
import org.teiid.deployers.RuntimeVDB;
import org.teiid.deployers.TranslatorUtil;
import org.teiid.deployers.UDFMetaData;
import org.teiid.deployers.VDBRepository;
import org.teiid.deployers.VDBStatusChecker;
import org.teiid.dqp.internal.datamgr.TranslatorRepository;
import org.teiid.logging.LogConstants;
import org.teiid.logging.LogManager;
import org.teiid.metadata.index.IndexMetadataRepository;
import org.teiid.query.ObjectReplicator;
import org.teiid.query.metadata.VDBResources;
import org.teiid.vdb.runtime.VDBKey;


class VDBDeployer implements DeploymentUnitProcessor {
	private static final String JAVA_CONTEXT = "java:/"; //$NON-NLS-1$			
	private TranslatorRepository translatorRepository;
	private String asyncThreadPoolName;
	private VDBRepository vdbRepository;
	JBossLifeCycleListener shutdownListener;
	
	public VDBDeployer (TranslatorRepository translatorRepo, String poolName, VDBRepository vdbRepo, JBossLifeCycleListener shutdownListener) {
		this.translatorRepository = translatorRepo;
		this.asyncThreadPoolName = poolName;
		this.vdbRepository = vdbRepo;
		this.shutdownListener = shutdownListener;
	}
	
	public void deploy(final DeploymentPhaseContext context)  throws DeploymentUnitProcessingException {
		final DeploymentUnit deploymentUnit = context.getDeploymentUnit();
		if (!TeiidAttachments.isVDBDeployment(deploymentUnit)) {
			return;
		}
		final VDBMetaData deployment = deploymentUnit.getAttachment(TeiidAttachments.VDB_METADATA);
		deployment.addProperty(TranslatorUtil.DEPLOYMENT_NAME, deploymentUnit.getName());
		// check to see if there is old vdb already deployed.
        final ServiceController<?> controller = context.getServiceRegistry().getService(TeiidServiceNames.vdbServiceName(deployment.getName(), deployment.getVersion()));
        if (controller != null) {
        	LogManager.logInfo(LogConstants.CTX_RUNTIME,  IntegrationPlugin.Util.gs(IntegrationPlugin.Event.TEIID50019, deployment));
            controller.setMode(ServiceController.Mode.REMOVE);
        }
		
		boolean preview = deployment.isPreview();
		if (!preview && deployment.hasErrors()) {
			throw new DeploymentUnitProcessingException(IntegrationPlugin.Util.gs(IntegrationPlugin.Event.TEIID50074, deployment));
		}
		
		// make sure the translator defined exists in configuration; otherwise add as error
		for (ModelMetaData model:deployment.getModelMetaDatas().values()) {
			if (!model.isSource() || model.getSourceNames().isEmpty()) {
				continue;
			}
			for (String source:model.getSourceNames()) {
				
				String translatorName = model.getSourceTranslatorName(source);
				if (deployment.isOverideTranslator(translatorName)) {
					VDBTranslatorMetaData parent = deployment.getTranslator(translatorName);
					translatorName = parent.getType();
				}
				
				Translator translator = this.translatorRepository.getTranslatorMetaData(translatorName);
				if ( translator == null) {	
					String msg = IntegrationPlugin.Util.gs(IntegrationPlugin.Event.TEIID50077, translatorName, deployment.getName(), deployment.getVersion());
					LogManager.logWarning(LogConstants.CTX_RUNTIME, msg);
				}	
			}
		}
		
		// add VDB module's classloader as an attachment
		ModuleClassLoader classLoader = deploymentUnit.getAttachment(Attachments.MODULE).getClassLoader();
		deployment.addAttchment(ClassLoader.class, classLoader);
		deployment.addAttchment(ScriptEngineManager.class, new ScriptEngineManager(classLoader));
		
		UDFMetaData udf = deploymentUnit.removeAttachment(TeiidAttachments.UDF_METADATA);
		if (udf == null) {
			udf = new UDFMetaData();
		}
		udf.setFunctionClassLoader(classLoader);
		deployment.addAttchment(UDFMetaData.class, udf);
		
		VirtualFile file = deploymentUnit.getAttachment(Attachments.DEPLOYMENT_ROOT).getRoot();
		VDBResources resources;
		try {
			resources = new VDBResources(file, deployment);
		} catch (IOException e) {
			throw new DeploymentUnitProcessingException(IntegrationPlugin.Event.TEIID50017.name(), e);
		}
		
		this.vdbRepository.addPendingDeployment(deployment);
		// build a VDB service
		final VDBService vdb = new VDBService(deployment, resources);
		vdb.addMetadataRepository("index", new IndexMetadataRepository()); //$NON-NLS-1$
		
		final ServiceBuilder<RuntimeVDB> vdbService = context.getServiceTarget().addService(TeiidServiceNames.vdbServiceName(deployment.getName(), deployment.getVersion()), vdb);
		
		// add dependencies to data-sources
		dataSourceDependencies(deployment, context.getServiceTarget());
		
		for (VDBImport vdbImport : deployment.getVDBImports()) {
			vdbService.addDependency(TeiidServiceNames.vdbFinishedServiceName(vdbImport.getName(), vdbImport.getVersion()));
		}
		
		// adding the translator services is redundant, however if one is removed then it is an issue.
		for (Model model:deployment.getModels()) {
			List<String> sourceNames = model.getSourceNames();
			for (String sourceName:sourceNames) {
				String translatorName = model.getSourceTranslatorName(sourceName);
				if (deployment.isOverideTranslator(translatorName)) {
					VDBTranslatorMetaData translator = deployment.getTranslator(translatorName);
					translatorName = translator.getType();					
				}
				vdbService.addDependency(TeiidServiceNames.translatorServiceName(translatorName));
			}
		}
		
		ServiceName vdbSwitchServiceName = TeiidServiceNames.vdbSwitchServiceName(deployment.getName(), deployment.getVersion());
		vdbService.addDependency(TeiidServiceNames.VDB_REPO, VDBRepository.class,  vdb.vdbRepositoryInjector);
		vdbService.addDependency(TeiidServiceNames.TRANSLATOR_REPO, TranslatorRepository.class,  vdb.translatorRepositoryInjector);
		vdbService.addDependency(TeiidServiceNames.executorServiceName(this.asyncThreadPoolName), Executor.class,  vdb.executorInjector);
		vdbService.addDependency(TeiidServiceNames.OBJECT_SERIALIZER, ObjectSerializer.class, vdb.serializerInjector);
		vdbService.addDependency(TeiidServiceNames.BUFFER_MGR, BufferManager.class, vdb.bufferManagerInjector);
		vdbService.addDependency(TeiidServiceNames.VDB_STATUS_CHECKER, VDBStatusChecker.class, vdb.vdbStatusCheckInjector);
		vdbService.addDependency(vdbSwitchServiceName, CountDownLatch.class, new InjectedValue<CountDownLatch>());
		vdbService.addDependency(DependencyType.OPTIONAL, TeiidServiceNames.OBJECT_REPLICATOR, ObjectReplicator.class, vdb.objectReplicatorInjector);
		
		// REST dependencies
		vdbService.addDependency(Services.JBOSS_SERVER_CONTROLLER, ModelController.class, vdb.controllerValue);
		
		// VDB restart switch, control the vdbservice by adding removing the switch service. If you
		// remove the service by setting status remove, there is no way start it back up if vdbservice used alone
		installVDBSwitchService(context.getServiceTarget(), vdbSwitchServiceName);
		
		vdbService.addListener(new AbstractServiceListener<Object>() {
        	@Override
            public void transition(final ServiceController controller, final ServiceController.Transition transition) {
        		if (transition.equals(ServiceController.Transition.DOWN_to_WAITING)) {
        			RuntimeVDB runtimeVDB = RuntimeVDB.class.cast(controller.getValue());
        			if (runtimeVDB != null && runtimeVDB.isRestartInProgress()) {
            			ServiceName vdbSwitchServiceName = TeiidServiceNames.vdbSwitchServiceName(deployment.getName(), deployment.getVersion());
            			ServiceController<?> switchSvc =  controller.getServiceContainer().getService(vdbSwitchServiceName);
            			if (switchSvc != null) {
            				CountDownLatch latch = CountDownLatch.class.cast(switchSvc.getValue());
            				try {
            					latch.await(5, TimeUnit.SECONDS);
							} catch (InterruptedException e) {
								// todo:log it?
							}
            			}
            			installVDBSwitchService(controller.getServiceContainer(), vdbSwitchServiceName);
        			}
        		}
            }			
		});
		vdbService.setInitialMode(Mode.PASSIVE).install();
	}
	
	private void installVDBSwitchService(final ServiceTarget serviceTarget, ServiceName vdbSwitchServiceName) {
		// install switch service now.
		ServiceBuilder<CountDownLatch> svc = serviceTarget.addService(vdbSwitchServiceName, new Service<CountDownLatch>() {
			private CountDownLatch latch = new CountDownLatch(1);
			@Override
			public CountDownLatch getValue() throws IllegalStateException,IllegalArgumentException {
				return this.latch;
			}
			@Override
			public void start(StartContext context) throws StartException {
			}
			@Override
			public void stop(StopContext context) {
			}
		});
		svc.addListener(new AbstractServiceListener<Object>() {
			@Override
		    public void transition(final ServiceController controller, final ServiceController.Transition transition) {
				if (transition.equals(ServiceController.Transition.REMOVING_to_REMOVED)) {
					CountDownLatch latch = CountDownLatch.class.cast(controller.getValue());
					latch.countDown();
				}
			}
		});
		svc.install();
	}	
	
	static void addDataSourceListener(
			final ServiceTarget serviceTarget,
			final VDBKey vdbKey,
			final String dsName) {
		final String jndiName = getJndiName(dsName);
		final ContextNames.BindInfo bindInfo = ContextNames.bindInfoFor(jndiName);
		final ServiceName svcName = bindInfo.getBinderServiceName();
		DataSourceListener dsl = new DataSourceListener(dsName, svcName, vdbKey);									
		ServiceBuilder<DataSourceListener> sb = serviceTarget.addService(TeiidServiceNames.dsListenerServiceName(vdbKey.getName(), vdbKey.getVersion(), dsName), dsl);
		sb.addDependency(svcName);
		sb.addDependency(TeiidServiceNames.VDB_STATUS_CHECKER, VDBStatusChecker.class, dsl.vdbStatusCheckInjector);
		sb.setInitialMode(Mode.PASSIVE).install();
	}
	
	private void dataSourceDependencies(VDBMetaData deployment, ServiceTarget serviceTarget) {
		final VDBKey vdbKey = new VDBKey(deployment.getName(), deployment.getVersion());
		Set<String> dataSources = new HashSet<String>();
		for (ModelMetaData model:deployment.getModelMetaDatas().values()) {
			for (String sourceName:model.getSourceNames()) {
				// Need to make the data source service as dependency; otherwise dynamic vdbs will not work correctly.
				String dsName = model.getSourceConnectionJndiName(sourceName);
				if (dsName == null) {
					continue;
				}
				if (!dataSources.add(VDBStatusChecker.stripContext(dsName))) {
					continue; //already listening
				}
				addDataSourceListener(serviceTarget, vdbKey, dsName);				
			}
		}
	}
	
	static class DataSourceListener implements Service<DataSourceListener>{
		private String dsName;
		private ServiceName svcName;
		private VDBKey vdb;
		InjectedValue<VDBStatusChecker> vdbStatusCheckInjector = new InjectedValue<VDBStatusChecker>();
		
		public DataSourceListener(String dsName, ServiceName svcName, VDBKey vdb) {
			this.dsName = dsName;
			this.svcName = svcName;
			this.vdb = vdb;
		}
		
		public DataSourceListener getValue() throws IllegalStateException,IllegalArgumentException {
			return this;
		}

		@Override
		public void start(StartContext context) throws StartException {
			ServiceController<?> s = context.getController().getServiceContainer().getService(this.svcName);
			if (s != null) {
				this.vdbStatusCheckInjector.getValue().dataSourceAdded(this.dsName, vdb);
			}
		}

		@Override
		public void stop(StopContext context) {
			ServiceController<?> s = context.getController().getServiceContainer().getService(this.svcName);
			if (s.getMode().equals(Mode.REMOVE) || s.getState().equals(State.STOPPING)) {
				this.vdbStatusCheckInjector.getValue().dataSourceRemoved(this.dsName, vdb);
			}
		}		
	}

	public static String getJndiName(String name) {
		String jndiName = name;
		if (!name.startsWith(JAVA_CONTEXT)) {
			jndiName = JAVA_CONTEXT + jndiName;
		}
		return jndiName;
	}	
	
	@Override
	public void undeploy(final DeploymentUnit deploymentUnit) {
		if (!TeiidAttachments.isVDBDeployment(deploymentUnit)) {
			return;
		}	
		
		final VDBMetaData deployment = deploymentUnit.getAttachment(TeiidAttachments.VDB_METADATA);
		if (!this.shutdownListener.isShutdownInProgress()) {
			final VDBMetaData vdb = deploymentUnit.getAttachment(TeiidAttachments.VDB_METADATA);
			
			ServiceController<?> sc = deploymentUnit.getServiceRegistry().getService(TeiidServiceNames.OBJECT_SERIALIZER);
			if (sc != null) {
				ObjectSerializer serilalizer = ObjectSerializer.class.cast(sc.getValue());
				serilalizer.removeAttachments(vdb);	
				LogManager.logTrace(LogConstants.CTX_RUNTIME, "VDB "+vdb.getName()+" metadata removed"); //$NON-NLS-1$ //$NON-NLS-2$
			}		
		}
		this.vdbRepository.removeVDB(deployment.getName(), deployment.getVersion());
	
		for (ModelMetaData model:deployment.getModelMetaDatas().values()) {
			for (SourceMappingMetadata smm:model.getSources().values()) {
				String dsName = smm.getConnectionJndiName();
				if (dsName == null) {
					continue;
				}
		        
				final ServiceController<?> dsService = deploymentUnit.getServiceRegistry().getService(TeiidServiceNames.dsListenerServiceName(deployment.getName(), deployment.getVersion(), dsName));
				if (dsService != null) {
					dsService.setMode(ServiceController.Mode.REMOVE);
				}
			}
		}
		
        final ServiceController<?> controller = deploymentUnit.getServiceRegistry().getService(TeiidServiceNames.vdbServiceName(deployment.getName(), deployment.getVersion()));
        if (controller != null) {
            controller.setMode(ServiceController.Mode.REMOVE);
        }
	}
}
