/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2012, 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.clustering.jgroups.subsystem;

import java.util.List;

import org.jboss.as.controller.AbstractAddStepHandler;
import org.jboss.as.controller.ModelVersion;
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.PathElement;
import org.jboss.as.controller.ReloadRequiredWriteAttributeHandler;
import org.jboss.as.controller.ServiceVerificationHandler;
import org.jboss.as.controller.SimpleAttributeDefinition;
import org.jboss.as.controller.SimpleAttributeDefinitionBuilder;
import org.jboss.as.controller.SimpleResourceDefinition;
import org.jboss.as.controller.registry.AttributeAccess;
import org.jboss.as.controller.registry.ManagementResourceRegistration;
import org.jboss.as.controller.transform.description.RejectAttributeChecker;
import org.jboss.as.controller.transform.description.ResourceTransformationDescriptionBuilder;
import org.jboss.dmr.ModelNode;
import org.jboss.dmr.ModelType;
import org.jboss.msc.service.ServiceController;

/**
 * Resource description for the addressable resources:
 *
 *   /subsystem=jgroups/stack=X/transport=TRANSPORT/property=Z
 *   /subsystem=jgroups/stack=X/protocol=Y/property=Z
 *
 * @author Richard Achmatowicz (c) 2011 Red Hat Inc.
 */
public class PropertyResourceDefinition extends SimpleResourceDefinition {

    static final PathElement WILDCARD_PATH = pathElement(PathElement.WILDCARD_VALUE);

    static PathElement pathElement(String name) {
        return PathElement.pathElement(ModelKeys.PROPERTY, name);
    }

    static final SimpleAttributeDefinition VALUE = new SimpleAttributeDefinitionBuilder(ModelKeys.VALUE, ModelType.STRING, false)
            .setAllowExpression(true)
            .setFlags(AttributeAccess.Flag.RESTART_ALL_SERVICES)
            .build();

    static final OperationStepHandler REMOVE_HANDLER = new OperationStepHandler() {
        @Override
        public void execute(final OperationContext context, final ModelNode operation) throws OperationFailedException {
            context.removeResource(PathAddress.EMPTY_ADDRESS);
            reloadRequiredStep(context);
            context.stepCompleted();
        }
    };

    static final AbstractAddStepHandler ADD_HANDLER = new AbstractAddStepHandler() {
        @Override
        protected void populateModel(ModelNode operation, ModelNode model) throws OperationFailedException {
            PropertyResourceDefinition.VALUE.validateAndSet(operation, model);
        }

        @Override
        protected void performRuntime(OperationContext context, ModelNode operation, ModelNode model, ServiceVerificationHandler verificationHandler, List<ServiceController<?>> newControllers) throws OperationFailedException {
            reloadRequiredStep(context);
        }
    };

    static void buildTransformation(ModelVersion version, ResourceTransformationDescriptionBuilder parent) {
        ResourceTransformationDescriptionBuilder builder = parent.addChildResource(WILDCARD_PATH);

        if (JGroupsModel.VERSION_1_2_0.requiresTransformation(version)) {
            builder.getAttributeBuilder().addRejectCheck(RejectAttributeChecker.SIMPLE_EXPRESSIONS, VALUE);
        }
    }

    static final PropertyResourceDefinition INSTANCE = new PropertyResourceDefinition();

    // registration
    private PropertyResourceDefinition() {
        super(WILDCARD_PATH, JGroupsExtension.getResourceDescriptionResolver(ModelKeys.PROPERTY), PropertyResourceDefinition.ADD_HANDLER, PropertyResourceDefinition.REMOVE_HANDLER);
    }

    @Override
    public void registerAttributes(ManagementResourceRegistration registration) {
        registration.registerReadWriteAttribute(VALUE, null, new ReloadRequiredWriteAttributeHandler(VALUE));
    }

    /**
     * Add a step triggering the {@linkplain org.jboss.as.controller.OperationContext#reloadRequired()} in case the
     * the cache service is installed, since the transport-config operations need a reload/restart and can't be
     * applied to the runtime directly.
     *
     * @param context the operation context
     */
    static void reloadRequiredStep(final OperationContext context) {
        if (context.getProcessType().isServer() &&  !context.isBooting()) {
            context.addStep(new OperationStepHandler() {
                @Override
                public void execute(final OperationContext context, final ModelNode operation) throws OperationFailedException {
                    // add some condition here if reload needs to be conditional on context
                    // e.g. if a service is not installed, don't do a reload
                    context.reloadRequired();
                    context.completeStep(OperationContext.RollbackHandler.REVERT_RELOAD_REQUIRED_ROLLBACK_HANDLER);
                }
            }, OperationContext.Stage.RUNTIME);
        }
    }
}
