/**
    * Copyright 2005-2012 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.kew.routemodule.service.impl;
  
  import org.apache.log4j.Logger;
  import org.kuali.rice.core.api.reflect.ObjectDefinition;
  import org.kuali.rice.core.api.resourceloader.GlobalResourceLoader;
  import org.kuali.rice.kew.actionrequest.ActionRequestValue;
  import org.kuali.rice.kew.api.WorkflowRuntimeException;
  import org.kuali.rice.kew.api.exception.ResourceUnavailableException;
  import org.kuali.rice.kew.engine.node.RouteNode;
  import org.kuali.rice.kew.role.RoleRouteModule;
  import org.kuali.rice.kew.routemodule.FlexRMAdapter;
  import org.kuali.rice.kew.routemodule.RouteModule;
  import org.kuali.rice.kew.routemodule.service.RouteModuleService;
  import org.kuali.rice.kew.api.KewApiConstants;
  import org.springframework.beans.BeansException;
  import org.springframework.beans.factory.BeanFactory;
  import org.springframework.beans.factory.BeanFactoryAware;
  
  /**
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class RouteModuleServiceImpl implements RouteModuleService, BeanFactoryAware {
  
      private static final Logger LOG = Logger.getLogger(RouteModuleServiceImpl.class);
  
      private BeanFactory beanFactory;
      private String rulesEngineRouteModuleId;
  
      private RouteModule peopleFlowRouteModule;
      private volatile RouteModule rulesEngineRouteModule;
  
      public RouteModule findRouteModule(RouteNode node) throws ResourceUnavailableException {
          String routeMethodName = node.getRouteMethodName();
          LOG.debug("Finding route module for routeMethodName="+routeMethodName+" at route level "+node.getRouteNodeName());
          RouteModule routeModule = null;
          // default to FlexRM module if the routeMethodName is null
          if (node.isRulesEngineNode()) {
              routeModule = getRulesEngineRouteModule();
          } else if (node.isPeopleFlowNode()) {
              routeModule = getPeopleFlowRouteModule();
          } else if (routeMethodName == null || node.isFlexRM()) {
              routeModule = getFlexRMRouteModule(routeMethodName);
          } else {
              routeModule = getRouteModule(routeMethodName);
          }
          return routeModule;
      }
  
      public RouteModule findRouteModule(ActionRequestValue actionRequest) throws ResourceUnavailableException {
      	if (!actionRequest.getResolveResponsibility()) {
      		return new RoleRouteModule();
      	}
          if (actionRequest.getNodeInstance() == null) {
              return null;
          }
          return findRouteModule(actionRequest.getNodeInstance().getRouteNode());
      }
  
      private RouteModule getRouteModule(String routeMethodName) throws ResourceUnavailableException {
          if (routeMethodName == null) {
              return null;
          } else if ("".equals(routeMethodName.trim()) || KewApiConstants.ROUTE_LEVEL_NO_ROUTE_MODULE.equals(routeMethodName)) {
                  return null;
          }
          Object routeModule = GlobalResourceLoader.getObject(new ObjectDefinition(routeMethodName));//SpringServiceLocator.getExtensionService().getRouteModule(routeMethodName);
          if (routeModule instanceof RouteModule) {
              return (RouteModule)routeModule;
          }
          throw new WorkflowRuntimeException("Could not locate the Route Module with the given name: " + routeMethodName);
      }
  
      private RouteModule getFlexRMRouteModule(String ruleTemplateName) {
          return new FlexRMAdapter();
      }
  
      public void setPeopleFlowRouteModule(RouteModule peopleFlowRouteModule) {
          this.peopleFlowRouteModule = peopleFlowRouteModule;
      }
  
      public RouteModule getPeopleFlowRouteModule() {
          return peopleFlowRouteModule;
      }
  
      public String getRulesEngineRouteModuleId() {
         return rulesEngineRouteModuleId;
     }
 
     public void setRulesEngineRouteModuleId(String rulesEngineRouteModuleId) {
         this.rulesEngineRouteModuleId = rulesEngineRouteModuleId;
     }
 
     @Override
     public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
         this.beanFactory = beanFactory;
     }
 
     /**
      * Loaded lazily by id so as not to introduce a runtime dependency on KRMS when it is not in use.
      */
     protected RouteModule getRulesEngineRouteModule() {
         if (rulesEngineRouteModule == null) {
             // this should initialize the route module in spring
             rulesEngineRouteModule = (RouteModule)beanFactory.getBean(getRulesEngineRouteModuleId());
         }
         return rulesEngineRouteModule;
     }
 
 }