/*
 * Copyright 2013 Red Hat Inc. and/or its affiliates and other contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,  
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.switchyard.as7.extension.admin;

import static org.switchyard.as7.extension.SwitchYardModelConstants.SERVICE_NAME;
import static org.switchyard.as7.extension.SwitchYardModelConstants.TYPE;

import javax.xml.namespace.QName;

import org.jboss.as.controller.OperationContext;
import org.jboss.as.controller.OperationFailedException;
import org.jboss.as.controller.OperationStepHandler;
import org.jboss.dmr.ModelNode;
import org.jboss.msc.service.ServiceController;
import org.switchyard.admin.Application;
import org.switchyard.admin.ComponentService;
import org.switchyard.admin.Reference;
import org.switchyard.admin.Service;
import org.switchyard.admin.SwitchYard;
import org.switchyard.as7.extension.services.SwitchYardAdminService;

/**
 * SwitchYardSubsystemShowMetrics
 * 
 * Operation returning metrics for services deployed on the SwitchYard subsystem.
 */
public final class SwitchYardSubsystemShowMetrics implements OperationStepHandler {

    /**
     * The global instance for this operation.
     */
    public static final SwitchYardSubsystemShowMetrics INSTANCE = new SwitchYardSubsystemShowMetrics();

    private SwitchYardSubsystemShowMetrics() {
        // forbidden inheritance
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.jboss.as.controller.OperationStepHandler#execute(org.jboss.as.controller
     * .OperationContext, org.jboss.dmr.ModelNode)
     */
    @Override
    public void execute(final OperationContext context, final ModelNode operation) throws OperationFailedException {

        context.addStep(new OperationStepHandler() {
            @Override
            public void execute(final OperationContext context, final ModelNode operation)
                    throws OperationFailedException {
                final ServiceController<?> controller = context.getServiceRegistry(false).getRequiredService(
                        SwitchYardAdminService.SERVICE_NAME);
                SwitchYard switchYard = SwitchYard.class.cast(controller.getService().getValue());
                if (operation.hasDefined(SERVICE_NAME)) {
                    final String serviceName = operation.get(SERVICE_NAME).asString();
                    final String type = operation.get(TYPE).asString();
                    final QName serviceQName = QName.valueOf(serviceName);
                    for (Application application : switchYard.getApplications()) {
                        if (type == null || "*".equals(type) || "service".equals(type)) {
                            for (Service service : application.getServices()) {
                                if ("*".equals(serviceName) || serviceQName.equals(service.getName())) {
                                    context.getResult().add(ModelNodeCreationUtil.createServiceMetricsNode(service));
                                }
                            }
                        }
                        if (type == null || "*".equals(type) || "reference".equals(type)) {
                            for (Reference reference : application.getReferences()) {
                                if ("*".equals(serviceName) || serviceQName.equals(reference.getName())) {
                                    context.getResult().add(ModelNodeCreationUtil.createReferenceMetricsNode(reference));
                                }
                            }
                        }
                        if (type == null || "*".equals(type) || "componentService".equals(type)) {
                            for (ComponentService componentService : application.getComponentServices()) {
                                if ("*".equals(serviceName) || serviceQName.equals(componentService.getName())) {
                                    context.getResult().add(ModelNodeCreationUtil.createComponentServiceMetricsNode(componentService));
                                }
                            }
                        }
                    }
                } else {
                    context.getResult().add(
                            ModelNodeCreationUtil.addMetricsToNode(
                                    new ModelNode(), switchYard.getMessageMetrics()));
                }
                
                context.stepCompleted();
            }
        }, OperationContext.Stage.RUNTIME);
        context.stepCompleted();
    }
    
}
