package org.jboss.as.clustering.jgroups.subsystem;

import java.util.List;

import org.jboss.as.controller.AbstractAddStepHandler;
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.operations.validation.StringLengthValidator;
import org.jboss.as.controller.registry.AttributeAccess;
import org.jboss.as.controller.registry.ManagementResourceRegistration;
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 PROPERTY_PATH = PathElement.pathElement(ModelKeys.PROPERTY);

    static SimpleAttributeDefinition VALUE =
            new SimpleAttributeDefinitionBuilder("value", ModelType.STRING, false)
                    .setXmlName("value")
                    .setAllowExpression(true)
                    .setFlags(AttributeAccess.Flag.RESTART_ALL_SERVICES)
                    .setValidator(new StringLengthValidator(0))
                    .build();


    static final OperationStepHandler REMOVE = 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 PROTOCOL_PROPERTY_ADD = 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 final PropertyResourceDefinition INSTANCE = new PropertyResourceDefinition() ;

    // registration
    PropertyResourceDefinition() {
        super(PROPERTY_PATH,
                JGroupsExtension.getResourceDescriptionResolver(ModelKeys.PROPERTY),
                PropertyResourceDefinition.PROTOCOL_PROPERTY_ADD,
                PropertyResourceDefinition.REMOVE);
    }

    @Override
    public void registerOperations(ManagementResourceRegistration resourceRegistration) {
        super.registerOperations(resourceRegistration);
    }

    @Override
    public void registerAttributes(ManagementResourceRegistration resourceRegistration) {
        super.registerAttributes(resourceRegistration);

        resourceRegistration.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.stepCompleted();
                }
            }, OperationContext.Stage.RUNTIME);
        }
    }

}
