/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2015, 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.wildfly.extension.clustering.singleton;

import org.jboss.as.clustering.controller.AddStepHandler;
import org.jboss.as.clustering.controller.ResourceDescriptor;
import org.jboss.as.clustering.controller.Registration;
import org.jboss.as.clustering.controller.ReloadRequiredWriteAttributeHandler;
import org.jboss.as.clustering.controller.RemoveStepHandler;
import org.jboss.as.clustering.controller.ResourceServiceHandler;
import org.jboss.as.clustering.controller.SimpleResourceServiceHandler;
import org.jboss.as.controller.PathAddress;
import org.jboss.as.controller.PathElement;
import org.jboss.as.controller.SimpleAttributeDefinition;
import org.jboss.as.controller.SimpleAttributeDefinitionBuilder;
import org.jboss.as.controller.SimpleResourceDefinition;
import org.jboss.as.controller.capability.RuntimeCapability;
import org.jboss.as.controller.registry.ManagementResourceRegistration;
import org.jboss.dmr.ModelNode;
import org.jboss.dmr.ModelType;
import org.wildfly.clustering.service.SubGroupServiceNameFactory;
import org.wildfly.clustering.singleton.SingletonPolicy;

/**
 * Definition of a singleton policy resource.
 * @author Paul Ferraro
 */
public class SingletonPolicyResourceDefinition extends SimpleResourceDefinition implements Registration {

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

    static PathElement pathElement(String value) {
        return PathElement.pathElement("singleton-policy", value);
    }

    enum Capability implements org.jboss.as.clustering.controller.Capability {
        POLICY(SingletonPolicy.CAPABILITY_NAME, SingletonPolicy.class),
        ;
        private final RuntimeCapability<Void> definition;

        Capability(String name, Class<?> type) {
            this.definition = RuntimeCapability.Builder.of(name, true).setServiceType(type).build();
        }

        @Override
        public RuntimeCapability<Void> getDefinition() {
            return this.definition;
        }

        @Override
        public RuntimeCapability<Void> getRuntimeCapability(PathAddress address) {
            return this.definition.fromBaseCapability(address.getLastElement().getValue());
        }
    }

    enum Attribute implements org.jboss.as.clustering.controller.Attribute {
        CACHE_CONTAINER("cache-container", ModelType.STRING, null),
        CACHE("cache", ModelType.STRING, new ModelNode(SubGroupServiceNameFactory.DEFAULT_SUB_GROUP)),
        QUORUM("quorum", ModelType.INT, new ModelNode(1)),
        ;
        private final SimpleAttributeDefinition definition;

        private Attribute(String name, ModelType type, ModelNode defaultValue) {
            this.definition = new SimpleAttributeDefinitionBuilder(name, type)
                    .setAllowExpression(true)
                    .setAllowNull(defaultValue != null)
                    .setDefaultValue(defaultValue)
                    .build();
        }

        @Override
        public SimpleAttributeDefinition getDefinition() {
            return this.definition;
        }
    }

    SingletonPolicyResourceDefinition() {
        super(WILDCARD_PATH, new SingletonResourceDescriptionResolver(WILDCARD_PATH));
    }

    @Override
    public void registerOperations(ManagementResourceRegistration registration) {
        ResourceDescriptor descriptor = new ResourceDescriptor(this.getResourceDescriptionResolver()).addAttributes(Attribute.class).addCapabilities(Capability.class);
        ResourceServiceHandler handler = new SimpleResourceServiceHandler<>(new SingletonPolicyBuilderFactory());
        new AddStepHandler(descriptor, handler).register(registration);
        new RemoveStepHandler(descriptor, handler).register(registration);
    }

    @Override
    public void registerAttributes(ManagementResourceRegistration registration) {
        new ReloadRequiredWriteAttributeHandler(Attribute.class).register(registration);
    }

    @Override
    public void registerChildren(ManagementResourceRegistration registration) {
        new RandomElectionPolicyResourceDefinition().register(registration);
        new SimpleElectionPolicyResourceDefinition().register(registration);
    }

    @Override
    public void register(ManagementResourceRegistration registration) {
        registration.registerSubModel(this);
    }
}
