/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2011, 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.messaging;

import static org.jboss.as.controller.SimpleAttributeDefinitionBuilder.create;
import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.ADD;
import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.OP_ADDR;
import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.REMOVE;
import static org.jboss.as.messaging.CommonAttributes.BINDINGS_DIRECTORY;
import static org.jboss.as.messaging.CommonAttributes.JOURNAL_DIRECTORY;
import static org.jboss.as.messaging.CommonAttributes.LARGE_MESSAGES_DIRECTORY;
import static org.jboss.as.messaging.CommonAttributes.PAGING_DIRECTORY;

import java.util.HashMap;
import java.util.Map;

import org.jboss.as.controller.AttributeDefinition;
import org.jboss.as.controller.OperationContext;
import org.jboss.as.controller.OperationFailedException;
import org.jboss.as.controller.OperationStepHandler;
import org.jboss.as.controller.PathAddress;
import org.jboss.as.controller.ReloadRequiredWriteAttributeHandler;
import org.jboss.as.controller.SimpleAttributeDefinition;
import org.jboss.as.controller.descriptions.ModelDescriptionConstants;
import org.jboss.as.controller.registry.ManagementResourceRegistration;
import org.jboss.as.controller.registry.Resource;
import org.jboss.as.controller.services.path.PathResourceDefinition;
import org.jboss.as.server.ServerEnvironment;
import org.jboss.dmr.ModelNode;
import org.jboss.msc.service.ServiceController;
import org.jboss.msc.service.ServiceName;


/**
 * @author Emanuel Muckenhuber
 */
public class MessagingPathHandlers {

    static final String DEFAULT_RELATIVE_TO = ServerEnvironment.SERVER_DATA_DIR;

    // base attribute for the 4 messaging path subresources.
    // each one define a different default values. Their respective attributes are accessed through the PATHS map.
    private static final SimpleAttributeDefinition PATH_BASE = create(PathResourceDefinition.PATH)
            .setAllowExpression(true)
            .setAllowNull(true)
            .setRestartAllServices()
            .build();

    public static final SimpleAttributeDefinition RELATIVE_TO = create(PathResourceDefinition.RELATIVE_TO)
            .setDefaultValue(new ModelNode(DEFAULT_RELATIVE_TO))
            .setAllowNull(true)
            .setRestartAllServices()
            .build();

    public static final Map<String, SimpleAttributeDefinition> PATHS = new HashMap<String, SimpleAttributeDefinition>();

    private static final String DEFAULT_PATH = "messaging";
    // all default paths dir are prepended with messaging
    // I am not sure this was not a typo and that they should have been put inside a messaging/ dir instead (as it
    // was stated in LocalDescriptions.properties)
    // For compatibility sake, we keep the messaging prefix.
    static final String DEFAULT_BINDINGS_DIR = DEFAULT_PATH + "bindings";
    static final String DEFAULT_JOURNAL_DIR = DEFAULT_PATH + "journal";
    static final String DEFAULT_LARGE_MESSAGE_DIR = DEFAULT_PATH + "largemessages";
    static final String DEFAULT_PAGING_DIR = DEFAULT_PATH + "paging";

    static {
        PATHS.put(BINDINGS_DIRECTORY, create(PATH_BASE).setDefaultValue(new ModelNode(DEFAULT_BINDINGS_DIR)).build());
        PATHS.put(JOURNAL_DIRECTORY, create(PATH_BASE).setDefaultValue(new ModelNode(DEFAULT_JOURNAL_DIR)).build());
        PATHS.put(LARGE_MESSAGES_DIRECTORY, create(PATH_BASE).setDefaultValue(new ModelNode(DEFAULT_LARGE_MESSAGE_DIR)).build());
        PATHS.put(PAGING_DIRECTORY, create(PATH_BASE).setDefaultValue(new ModelNode(DEFAULT_PAGING_DIR)).build());
    }

    static final AttributeDefinition[] getAttributes(final String path) {
        return new AttributeDefinition[] { PATHS.get(path), RELATIVE_TO };
    }

    static final OperationStepHandler PATH_ADD = new OperationStepHandler() {

        @Override
        public void execute(final OperationContext context, final ModelNode operation) throws OperationFailedException {
            final Resource resource = context.createResource(PathAddress.EMPTY_ADDRESS);
            final ModelNode model = resource.getModel();
            final String path = PathAddress.pathAddress(operation.require(OP_ADDR)).getLastElement().getValue();

            for (AttributeDefinition attribute : getAttributes(path)) {
                attribute.validateAndSet(operation, model);
            }
            reloadRequiredStep(context);
            context.stepCompleted();
        }
    };

    static final OperationStepHandler PATH_REMOVE = new OperationStepHandler() {

        @Override
        public void execute(OperationContext context, ModelNode operation) throws OperationFailedException {
            context.removeResource(PathAddress.EMPTY_ADDRESS);
            reloadRequiredStep(context);
            context.stepCompleted();
        }
    };

    static void register(final ManagementResourceRegistration registration, final String path) {
        registration.registerOperationHandler(ADD, PATH_ADD, new MessagingSubsystemProviders.PathAddProvider(path));
        registration.registerOperationHandler(REMOVE, PATH_REMOVE, MessagingSubsystemProviders.PATH_REMOVE);

        AttributeDefinition[] attributes = getAttributes(path);
        OperationStepHandler attributeHandler = new ReloadRequiredWriteAttributeHandler(attributes);
        for (AttributeDefinition attribute : attributes) {
            registration.registerReadWriteAttribute(attribute, null, attributeHandler);
        }
    }

    static void reloadRequiredStep(final OperationContext context) {
        if(context.isNormalServer()) {
            context.addStep(new OperationStepHandler() {
                @Override
                public void execute(final OperationContext context, final ModelNode operation) throws OperationFailedException {
                    final ServiceName hqServiceName = MessagingServices.getHornetQServiceName(PathAddress.pathAddress(operation.get(ModelDescriptionConstants.OP_ADDR)));
                    final ServiceController<?> controller = context.getServiceRegistry(false).getService(hqServiceName);
                    OperationContext.RollbackHandler rh;
                    if(controller != null) {
                        context.reloadRequired();
                        rh = OperationContext.RollbackHandler.REVERT_RELOAD_REQUIRED_ROLLBACK_HANDLER;
                    } else {
                        rh = OperationContext.RollbackHandler.NOOP_ROLLBACK_HANDLER;
                    }
                    context.completeStep(rh);
                }
            }, OperationContext.Stage.RUNTIME);
        }
    }

}
