/**
    * Copyright 2005-2013 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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.kuali.rice.ksb.messaging;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.core.api.config.property.ConfigContext;
  import org.kuali.rice.ksb.api.KsbApiServiceLocator;
  import org.kuali.rice.ksb.api.bus.Endpoint;
  import org.kuali.rice.ksb.api.messaging.AsynchronousCallback;
  import org.kuali.rice.ksb.api.messaging.MessageHelper;
  import org.kuali.rice.ksb.messaging.serviceproxies.AsynchronousServiceCallProxy;
  import org.kuali.rice.ksb.messaging.serviceproxies.DelayedAsynchronousServiceCallProxy;
  import org.kuali.rice.ksb.messaging.serviceproxies.SynchronousServiceCallProxy;
  import org.kuali.rice.ksb.util.KSBConstants;
  
  import javax.xml.namespace.QName;
  import java.io.Serializable;
  import java.util.ArrayList;
  import java.util.List;
  
  
  public class MessageHelperImpl implements MessageHelper {
  
      @Override
      public <T> T getServiceAsynchronously(QName qname) {
          return (T) getServiceAsynchronously(qname, null, null, null, null, null);
      }
  
      @Override
      public <T> T getServiceAsynchronously(QName qname, String applicationId) {
          return (T) getServiceAsynchronously(qname, applicationId, null, null, null, null);
      }
  
      @Override
      public <T> T getServiceAsynchronously(QName qname, AsynchronousCallback callback) {
          return (T) getServiceAsynchronously(qname, null, callback, null, null, null);
      }
  
      @Override
      public <T> T getServiceAsynchronously(QName qname, AsynchronousCallback callback, Serializable context) {
          return (T) getServiceAsynchronously(qname, null, callback, context, null, null);
      }
  
      @Override
      public <T> T getServiceAsynchronously(QName qname, AsynchronousCallback callback, Serializable context, String value1, String value2) {
          return (T) getServiceAsynchronously(qname, null, callback, context, value1, value2);
      }
  
      @Override
      public <T> T getServiceAsynchronously(QName qname, String applicationId, AsynchronousCallback callback,
              Serializable context, String value1, String value2) {
  
      	List<Endpoint> endpoints = KsbApiServiceLocator.getServiceBus().getEndpoints(qname);
          endpoints = filterEndpointsByApplicationId(endpoints, applicationId);
      	if (endpoints.isEmpty()) {
      		throw new RuntimeException("Cannot create service proxy, failed to locate any endpoints with the given service name: " + qname + (applicationId != null ? ", and application id: " + applicationId : ""));
      	}
          return (T) createProxy(syncMode(), endpoints, callback, context, value1, value2);
      }
  
      public <T> T getDelayedAsynchronousServiceCallProxy(QName qname, String applicationId, Serializable context, String value1, String value2, long delayMilliseconds) {
      	List<Endpoint> endpoints = KsbApiServiceLocator.getServiceBus().getEndpoints(qname);
          endpoints = filterEndpointsByApplicationId(endpoints, applicationId);
      	if (endpoints.isEmpty()) {
      		throw new RuntimeException("Cannot create service proxy, failed to locate any endpoints with the given service name: " + qname);
      	}
          return (T) createProxyDelayed(syncMode(), endpoints, context, value1, value2, delayMilliseconds);
      }
  
      @Override
      public <T> T getServiceAsynchronously(QName qname, Serializable context, String value1, String value2, long delayMilliseconds) {
          return (T) getDelayedAsynchronousServiceCallProxy(qname, null, context, value1, value2, delayMilliseconds);
      }
  
      public <T> T getServiceAsynchronously(QName qname, String applicationId, Serializable context, String value1, String value2, long delayMilliseconds) {
          return (T) getDelayedAsynchronousServiceCallProxy(qname, applicationId, context, value1, value2, delayMilliseconds);
      }
  
      @Override
      public <T> List<T> getAllRemoteServicesAsynchronously(QName qname) {
          List<Endpoint> endpoints = KsbApiServiceLocator.getServiceBus().getRemoteEndpoints(qname);
      	if (endpoints.isEmpty()) {
      		throw new RuntimeException("Cannot create service proxy, failed to locate any endpoints with the given service name: " + qname);
      	}
          final List<T> proxies = new ArrayList<T>();
          final boolean syncMode = syncMode();
         final String instanceId = KsbApiServiceLocator.getServiceBus().getInstanceId();
         for (Endpoint e : endpoints) {
             if (!e.getServiceConfiguration().getInstanceId().equals(instanceId)) {
                 proxies.add(MessageHelperImpl.<T>createProxy(syncMode, endpoints, null, null, null, null));
             }
         }
         return proxies;
     }
 
     public static <T> T createProxy(boolean sync, List<Endpoint> endpoints, AsynchronousCallback callback, Serializable context, String value1, String value2) {
         return sync ? (T) SynchronousServiceCallProxy.createInstance(endpoints, callback, context, value1, value2)
                 : (T) AsynchronousServiceCallProxy.createInstance(endpoints, callback, context, value1, value2);
     }
 
     public static <T> T createProxyDelayed(boolean sync, List<Endpoint> endpoints,Serializable context, String value1, String value2, long delayMilliseconds) {
         return sync ? (T) SynchronousServiceCallProxy.createInstance(endpoints, null, context, value1, value2)
                 : (T) DelayedAsynchronousServiceCallProxy.createInstance(endpoints, context, value1, value2, delayMilliseconds);
     }
 
     private static boolean syncMode() {
         return KSBConstants.MESSAGING_SYNCHRONOUS.equals(ConfigContext.getCurrentContextConfig().getProperty(KSBConstants.Config.MESSAGE_DELIVERY));
     }
 
     private List<Endpoint> filterEndpointsByApplicationId(List<Endpoint> endpoints, String applicationId) {
         if (StringUtils.isBlank(applicationId)) {
             return endpoints;
         }
         List<Endpoint> filteredEndpoints = new ArrayList<Endpoint>();
         for (Endpoint endpoint : endpoints) {
             if (endpoint.getServiceConfiguration().getApplicationId().equals(applicationId)) {
                 filteredEndpoints.add(endpoint);
             }
         }
         return filteredEndpoints;
     }
 
 }