/*
 * 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 java.util.EnumSet;

import javax.xml.stream.XMLStreamException;

import org.jboss.as.clustering.controller.Attribute;
import org.jboss.as.controller.persistence.SubsystemMarshallingContext;
import org.jboss.dmr.ModelNode;
import org.jboss.dmr.Property;
import org.jboss.staxmapper.XMLElementWriter;
import org.jboss.staxmapper.XMLExtendedStreamWriter;

/**
 * Marshals singleton deployer subsystem configuration to XML.
 * @author Paul Ferraro
 */
public class SingletonXMLWriter implements XMLElementWriter<SubsystemMarshallingContext> {

    @Override
    public void writeContent(XMLExtendedStreamWriter writer, SubsystemMarshallingContext context) throws XMLStreamException {
        context.startSubsystemElement(SingletonSchema.CURRENT.getNamespaceUri(), false);
        writeSingletonPolicies(writer, context.getModelNode());
        writer.writeEndElement();
    }

    private static void writeSingletonPolicies(XMLExtendedStreamWriter writer, ModelNode model) throws XMLStreamException {
        writer.writeStartElement(XMLElement.SINGLETON_POLICIES.getLocalName());

        writeAttributes(writer, model, SingletonResourceDefinition.Attribute.class);

        for (Property property : model.get(SingletonPolicyResourceDefinition.WILDCARD_PATH.getKey()).asPropertyList()) {
            writeSingletonPolicy(writer, property.getName(), property.getValue());
        }

        writer.writeEndElement();
    }

    private static void writeSingletonPolicy(XMLExtendedStreamWriter writer, String name, ModelNode policy) throws XMLStreamException {
        writer.writeStartElement(XMLElement.SINGLETON_POLICY.getLocalName());
        writer.writeAttribute(XMLAttribute.NAME.getLocalName(), name);

        writeAttributes(writer, policy, SingletonPolicyResourceDefinition.Attribute.class);

        if (policy.hasDefined(ElectionPolicyResourceDefinition.WILDCARD_PATH.getKey())) {
            Property property = policy.get(ElectionPolicyResourceDefinition.WILDCARD_PATH.getKey()).asProperty();
            writeElectionPolicy(writer, property.getName(), property.getValue());
        }

        writer.writeEndElement();
    }

    private static void writeElectionPolicy(XMLExtendedStreamWriter writer, String name, ModelNode policy) throws XMLStreamException {
        switch (name) {
            case RandomElectionPolicyResourceDefinition.PATH_VALUE: {
                writer.writeStartElement(XMLElement.RANDOM_ELECTION_POLICY.getLocalName());

                break;
            }
            case SimpleElectionPolicyResourceDefinition.PATH_VALUE: {
                writer.writeStartElement(XMLElement.SIMPLE_ELECTION_POLICY.getLocalName());

                writeAttributes(writer, policy, SimpleElectionPolicyResourceDefinition.Attribute.class);

                break;
            }
            default: {
                throw new IllegalArgumentException(name);
            }
        }

        writeElements(writer, policy, ElectionPolicyResourceDefinition.Attribute.class);

        writer.writeEndElement();
    }

    private static <A extends Enum<A> & Attribute> void writeAttributes(XMLExtendedStreamWriter writer, ModelNode model, Class<A> attributeClass) throws XMLStreamException {
        writeAttributes(writer, model, EnumSet.allOf(attributeClass));
    }

    private static void writeAttributes(XMLExtendedStreamWriter writer, ModelNode model, Iterable<? extends Attribute> attributes) throws XMLStreamException {
        for (Attribute attribute : attributes) {
            writeAttribute(writer, model, attribute);
        }
    }

    private static void writeAttribute(XMLExtendedStreamWriter writer, ModelNode model, Attribute attribute) throws XMLStreamException {
        attribute.getDefinition().getAttributeMarshaller().marshallAsAttribute(attribute.getDefinition(), model, false, writer);
    }

    private static <A extends Enum<A> & Attribute> void writeElements(XMLExtendedStreamWriter writer, ModelNode model, Class<A> attributeClass) throws XMLStreamException {
        writeElements(writer, model, EnumSet.allOf(attributeClass));
    }

    private static void writeElements(XMLExtendedStreamWriter writer, ModelNode model, Iterable<? extends Attribute> attributes) throws XMLStreamException {
        for (Attribute attribute : attributes) {
            writeElement(writer, model, attribute);
        }
    }

    private static void writeElement(XMLExtendedStreamWriter writer, ModelNode model, Attribute attribute) throws XMLStreamException {
        attribute.getDefinition().getAttributeMarshaller().marshallAsElement(attribute.getDefinition(), model, false, writer);
    }
}
