/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2010, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This 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 software 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 software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.jboss.as.txn.subsystem;

import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.ADD;
import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.OP;
import static org.jboss.as.txn.TransactionLogger.ROOT_LOGGER;

import java.util.Map;

import javax.management.MBeanServer;

import org.jboss.as.controller.Extension;
import org.jboss.as.controller.ExtensionContext;
import org.jboss.as.controller.ModelVersion;
import org.jboss.as.controller.OperationContext;
import org.jboss.as.controller.PathAddress;
import org.jboss.as.controller.PathElement;
import org.jboss.as.controller.SubsystemRegistration;
import org.jboss.as.controller.descriptions.ModelDescriptionConstants;
import org.jboss.as.controller.descriptions.StandardResourceDescriptionResolver;
import org.jboss.as.controller.operations.common.GenericSubsystemDescribeHandler;
import org.jboss.as.controller.parsing.ExtensionParsingContext;
import org.jboss.as.controller.registry.ManagementResourceRegistration;
import org.jboss.as.controller.services.path.ResolvePathHandler;
import org.jboss.as.controller.transform.TransformationContext;
import org.jboss.as.controller.transform.description.AttributeConverter;
import org.jboss.as.controller.transform.description.DiscardAttributeChecker;
import org.jboss.as.controller.transform.description.RejectAttributeChecker;
import org.jboss.as.controller.transform.description.ResourceTransformationDescriptionBuilder;
import org.jboss.as.controller.transform.description.TransformationDescription;
import org.jboss.as.controller.transform.description.TransformationDescriptionBuilder;
import org.jboss.as.txn.TransactionMessages;
import org.jboss.dmr.ModelNode;
import org.jboss.msc.service.ServiceController;
import org.jboss.msc.service.ServiceName;
import org.jboss.msc.service.ServiceRegistry;

/**
 * The transaction management extension.
 *
 * @author <a href="mailto:david.lloyd@redhat.com">David M. Lloyd</a>
 * @author Emanuel Muckenhuber
 * @author Scott Stark (sstark@redhat.com) (C) 2011 Red Hat Inc.
 * @author Mike Musgrove (mmusgrov@redhat.com) (C) 2012 Red Hat Inc.
 */
public class TransactionExtension implements Extension {
    public static final String SUBSYSTEM_NAME = "transactions";
    /**
     * The operation name to resolve the object store path
     */
    public static final String RESOLVE_OBJECT_STORE_PATH = "resolve-object-store-path";

    private static final String RESOURCE_NAME = TransactionExtension.class.getPackage().getName() + ".LocalDescriptions";

    private static final int MANAGEMENT_API_MAJOR_VERSION = 2;
    private static final int MANAGEMENT_API_MINOR_VERSION = 0;
    private static final int MANAGEMENT_API_MICRO_VERSION = 0;

    private static final ServiceName MBEAN_SERVER_SERVICE_NAME = ServiceName.JBOSS.append("mbean", "server");
    static final PathElement LOG_STORE_PATH = PathElement.pathElement(LogStoreConstants.LOG_STORE, LogStoreConstants.LOG_STORE);
    static final PathElement SUBSYSTEM_PATH = PathElement.pathElement(ModelDescriptionConstants.SUBSYSTEM, TransactionExtension.SUBSYSTEM_NAME);
    static final PathElement PARTICIPANT_PATH = PathElement.pathElement(LogStoreConstants.PARTICIPANTS);
    static final PathElement TRANSACTION_PATH = PathElement.pathElement(LogStoreConstants.TRANSACTIONS);


    static StandardResourceDescriptionResolver getResourceDescriptionResolver(final String... keyPrefix) {
        StringBuilder prefix = new StringBuilder(SUBSYSTEM_NAME);
        for (String kp : keyPrefix) {
            prefix.append('.').append(kp);
        }
        return new StandardResourceDescriptionResolver(prefix.toString(), RESOURCE_NAME, TransactionExtension.class.getClassLoader(), true, false);
    }

    static MBeanServer getMBeanServer(OperationContext context) {
        final ServiceRegistry serviceRegistry = context.getServiceRegistry(false);
        final ServiceController<?> serviceController = serviceRegistry.getService(MBEAN_SERVER_SERVICE_NAME);
        if (serviceController == null) {
            throw TransactionMessages.MESSAGES.jmxSubsystemNotInstalled();
        }
        return (MBeanServer) serviceController.getValue();
    }

    /**
     * {@inheritDoc}
     */
    public void initialize(ExtensionContext context) {
        ROOT_LOGGER.debug("Initializing Transactions Extension");
        final LogStoreResource resource = new LogStoreResource();
        final boolean registerRuntimeOnly = context.isRuntimeOnlyRegistrationValid();
        final SubsystemRegistration subsystem = context.registerSubsystem(SUBSYSTEM_NAME, MANAGEMENT_API_MAJOR_VERSION,
                MANAGEMENT_API_MINOR_VERSION, MANAGEMENT_API_MICRO_VERSION);

        final TransactionSubsystemRootResourceDefinition rootResourceDefinition = new TransactionSubsystemRootResourceDefinition(registerRuntimeOnly);
        final ManagementResourceRegistration registration = subsystem.registerSubsystemModel(rootResourceDefinition);
        registration.registerOperationHandler(GenericSubsystemDescribeHandler.DEFINITION, GenericSubsystemDescribeHandler.INSTANCE);

        // Create the path resolver handlers
        if (context.getProcessType().isServer()) {
            // It's less than ideal to create a separate operation here, but this extension contains two relative-to attributes
            final ResolvePathHandler objectStorePathHandler = ResolvePathHandler.Builder.of(RESOLVE_OBJECT_STORE_PATH, context.getPathManager())
                   .setPathAttribute(TransactionSubsystemRootResourceDefinition.OBJECT_STORE_PATH)
                   .setRelativeToAttribute(TransactionSubsystemRootResourceDefinition.OBJECT_STORE_RELATIVE_TO)
                   .build();
            registration.registerOperationHandler(objectStorePathHandler.getOperationDefinition(), objectStorePathHandler);

            final ResolvePathHandler resolvePathHandler = ResolvePathHandler.Builder.of(context.getPathManager())
                    .setPathAttribute(TransactionSubsystemRootResourceDefinition.PATH)
                    .setRelativeToAttribute(TransactionSubsystemRootResourceDefinition.RELATIVE_TO)
                    .setDeprecated(ModelVersion.create(1,4))
                    .build();
            registration.registerOperationHandler(resolvePathHandler.getOperationDefinition(), resolvePathHandler);
        }


        ManagementResourceRegistration logStoreChild = registration.registerSubModel(new LogStoreDefinition(resource));
        if (registerRuntimeOnly) {
            ManagementResourceRegistration transactionChild = logStoreChild.registerSubModel(new LogStoreTransactionDefinition(resource));
            transactionChild.registerSubModel(LogStoreTransactionParticipantDefinition.INSTANCE);
        }

        subsystem.registerXMLElementWriter(TransactionSubsystemXMLPersister.INSTANCE);

        if (context.isRegisterTransformers()) {
            // Register the model transformers
            registerTransformers(subsystem);
        }
    }

    /**
     * {@inheritDoc}
     */
    public void initializeParsers(ExtensionParsingContext context) {
        context.setSubsystemXmlMapping(SUBSYSTEM_NAME, Namespace.TRANSACTIONS_1_0.getUriString(), TransactionSubsystem10Parser.INSTANCE);
        context.setSubsystemXmlMapping(SUBSYSTEM_NAME, Namespace.TRANSACTIONS_1_1.getUriString(), TransactionSubsystem11Parser.INSTANCE);
        context.setSubsystemXmlMapping(SUBSYSTEM_NAME, Namespace.TRANSACTIONS_1_2.getUriString(), TransactionSubsystem12Parser.INSTANCE);
        context.setSubsystemXmlMapping(SUBSYSTEM_NAME, Namespace.TRANSACTIONS_1_3.getUriString(), TransactionSubsystem13Parser.INSTANCE);
        context.setSubsystemXmlMapping(SUBSYSTEM_NAME, Namespace.TRANSACTIONS_1_4.getUriString(), TransactionSubsystem14Parser.INSTANCE);
        context.setSubsystemXmlMapping(SUBSYSTEM_NAME, Namespace.TRANSACTIONS_2_0.getUriString(), TransactionSubsystem20Parser.INSTANCE);
    }

    // Transformation

    /**
     * Register the transformers for older model versions.
     *
     * @param subsystem the subsystems registration
     */
    private static void registerTransformers(final SubsystemRegistration subsystem) {

        final ResourceTransformationDescriptionBuilder subsystemRoot = TransformationDescriptionBuilder.Factory.createSubsystemInstance();

        //Versions < 1.3.0 assume 'true' for the hornetq-store-enable-async-io attribute (in which case it will look for the native libs
        //and enable async io if found. The default value if not defined is 'false' though. This should only be rejected if use-hornetq-store is not false.
        subsystemRoot.getAttributeBuilder()
                .setDiscard(new DiscardAttributeChecker.DiscardAttributeValueChecker(false, false, new ModelNode(true)),
                        TransactionSubsystemRootResourceDefinition.HORNETQ_STORE_ENABLE_ASYNC_IO)
                .addRejectCheck(RejectHornetQStoreAsyncIOChecker.INSTANCE, TransactionSubsystemRootResourceDefinition.HORNETQ_STORE_ENABLE_ASYNC_IO)
                // Legacy name for enabling/disabling statistics
                .addRename(TransactionSubsystemRootResourceDefinition.STATISTICS_ENABLED, CommonAttributes.ENABLE_STATISTICS)
                //Before 2.0.0 this value was not nillable in practise. Set it to 'false' if undefined.
                .setValueConverter(ProcessIdUuidConverter.INSTANCE, TransactionSubsystemRootResourceDefinition.PROCESS_ID_UUID);


        final ModelVersion version120 = ModelVersion.create(1, 2, 0);
        final TransformationDescription description120 = subsystemRoot.build();
        TransformationDescription.Tools.register(description120, subsystem, version120);

        subsystemRoot.getAttributeBuilder()
                .setDiscard(UnneededJDBCStoreChecker.INSTANCE, TransactionSubsystemRootResourceDefinition.attributes_1_2)
                .addRejectCheck(RejectAttributeChecker.DEFINED, TransactionSubsystemRootResourceDefinition.attributes_1_2);

        // Transformations to the 1.1.1 Model:
        // 1) Remove JDBC store attributes if not used
        // 2) Fail if new attributes are set (and not removed by step 1)

        // Reuse the builder and add reject expression for 1.1.1
        subsystemRoot.getAttributeBuilder()
                .addRejectCheck(RejectAttributeChecker.SIMPLE_EXPRESSIONS, TransactionSubsystemRootResourceDefinition.ATTRIBUTES_WITH_EXPRESSIONS_AFTER_1_1_1);

        final ModelVersion version111 = ModelVersion.create(1, 1, 1);
        final TransformationDescription description111 = subsystemRoot.build();
        TransformationDescription.Tools.register(description111, subsystem, version111);

        // Transformations to the 1.1.0 Model:
        // 1) Remove JDBC store attributes if not used
        // 2) Fail if new attributes are set (and not removed by step 1)
        // 3) Reject expressions
        final ModelVersion version110 = ModelVersion.create(1, 1, 0);

        subsystemRoot.getAttributeBuilder()
                .addRejectCheck(RejectAttributeChecker.SIMPLE_EXPRESSIONS, TransactionSubsystemRootResourceDefinition.ATTRIBUTES_WITH_EXPRESSIONS_AFTER_1_1_0);

        final TransformationDescription description110 = subsystemRoot.build();
        TransformationDescription.Tools.register(description110, subsystem, version110);
    }

    private static class UnneededJDBCStoreChecker implements DiscardAttributeChecker {

        static final UnneededJDBCStoreChecker INSTANCE = new UnneededJDBCStoreChecker();

        @Override
        public boolean isDiscardExpressions() {
            return false;
        }

        @Override
        public boolean isDiscardUndefined() {
            return true;
        }

        @Override
        public boolean isOperationParameterDiscardable(PathAddress address, String attributeName, ModelNode attributeValue, ModelNode operation, TransformationContext context) {
            final String op = operation.get(ModelDescriptionConstants.OP).asString();
            if(ModelDescriptionConstants.WRITE_ATTRIBUTE_OPERATION.equals(op)) {
                // Never discard this attribute for write-attribute operations
                if(attributeName.equals((TransactionSubsystemRootResourceDefinition.USE_JDBC_STORE.getName()))) {
                    return false;
                }
                // Check the current model
                final ModelNode model = context.readResource(PathAddress.EMPTY_ADDRESS).getModel();
                model.get(attributeName).set(attributeValue);
                return discard(model);
            } else {
                return discard(operation);
            }
        }

        @Override
        public boolean isResourceAttributeDiscardable(PathAddress address, String attributeName, ModelNode attributeValue, TransformationContext context) {
            return discard(context.readResource(PathAddress.EMPTY_ADDRESS).getModel());
        }

        boolean discard(final ModelNode model) {
            if(model.hasDefined(TransactionSubsystemRootResourceDefinition.USE_JDBC_STORE.getName())) {
                return ! model.get(TransactionSubsystemRootResourceDefinition.USE_JDBC_STORE.getName()).asBoolean(true); // discard if false
            }
            return true;
        }
    }

    private static class RejectHornetQStoreAsyncIOChecker extends RejectAttributeChecker.DefaultRejectAttributeChecker {
        static final RejectHornetQStoreAsyncIOChecker INSTANCE = new RejectHornetQStoreAsyncIOChecker();

        @Override
        public String getRejectionLogMessage(Map<String, ModelNode> attributes) {
            return TransactionMessages.MESSAGES.transformHornetQStoreEnableAsyncIoMustBeTrue();
        }

        @Override
        public boolean rejectOperationParameter(PathAddress address, String attributeName, ModelNode attributeValue,
                ModelNode operation, TransformationContext context) {
            if (operation.get(OP).asString().equals(ADD)) {
                return rejectCheck(address, attributeName, attributeValue, operation);
            }
            return rejectResourceAttribute(address, attributeName, attributeValue, context);
        }

        @Override
        public boolean rejectResourceAttribute(PathAddress address, String attributeName, ModelNode attributeValue,
                TransformationContext context) {
            return rejectCheck(address, attributeName, attributeValue, context.readResourceFromRoot(address).getModel());
        }

        protected boolean rejectCheck(PathAddress address, String attributeName, ModelNode attributeValue,
                ModelNode model) {
            //Will not get called if it was discarded
            if (!attributeValue.isDefined() || !attributeValue.asString().equals("true")) {
                //If use-hornetq-store is undefined or false, don't reject
                if (model.hasDefined(TransactionSubsystemRootResourceDefinition.USEHORNETQSTORE.getName())) {
                    return !model.get(TransactionSubsystemRootResourceDefinition.USEHORNETQSTORE.getName()).asString().equals("false");
                }
            }
            return false;
        }

        @Override
        protected boolean rejectAttribute(PathAddress address, String attributeName, ModelNode attributeValue,
                TransformationContext context) {
            //will not get called since we've overridden the other methods
            return false;
        }
    }

    private static class ProcessIdUuidConverter extends AttributeConverter.DefaultAttributeConverter {
        static final ProcessIdUuidConverter INSTANCE = new ProcessIdUuidConverter();
        @Override
        protected void convertAttribute(PathAddress address, String attributeName, ModelNode attributeValue, TransformationContext context) {
            if (!attributeValue.isDefined()){
                attributeValue.set(false);
            }
        }

    }

}
