/**
    * 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.krms.impl.repository;
  
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.krad.service.BusinessObjectService;
  import org.kuali.rice.krms.api.repository.action.ActionDefinition;
  import org.kuali.rice.krms.impl.util.KrmsImplConstants.PropertyNames;
  
  /**
   * Implementation of the interface for accessing KRMS repository Action related
   * business objects.
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   *
   */
  public final class ActionBoServiceImpl implements ActionBoService {
  
      private BusinessObjectService businessObjectService;
  
  	/**
  	 * This overridden method creates a KRMS Action in the repository.
  	 */
  	@Override
  	public ActionDefinition createAction(ActionDefinition action) {
  		if (action == null){
  	        throw new IllegalArgumentException("action is null");
  		}
  		final String actionNameKey = action.getName();
  		final String actionNamespaceKey = action.getNamespace();
  		final ActionDefinition existing = getActionByNameAndNamespace(actionNameKey, actionNamespaceKey);
  		if (existing != null){
              throw new IllegalStateException("the action to create already exists: " + action);			
  		}	
  		
  		ActionBo bo = ActionBo.from(action);
  		businessObjectService.save(bo);
  		
  		return ActionBo.to(bo);
  	}
  
  	/**
  	 * This overridden method updates an existing Action in the repository.
  	 */
  	@Override
  	public void updateAction(ActionDefinition action) {
  		if (action == null){
  	        throw new IllegalArgumentException("action is null");
  		}
  
  		// must already exist to be able to update
  		final String actionIdKey = action.getId();
  		final ActionBo existing = businessObjectService.findBySinglePrimaryKey(ActionBo.class, actionIdKey);
          if (existing == null) {
              throw new IllegalStateException("the action does not exist: " + action);
          }
          final ActionDefinition toUpdate;
          if (existing.getId().equals(action.getId())) {
              toUpdate = action;
          } else {
              // if passed in id does not match existing id, correct it
              final ActionDefinition.Builder builder = ActionDefinition.Builder.create(action);
              builder.setId(existing.getId());
              toUpdate = builder.build();
          }
       
  		// copy all updateable fields to bo
          ActionBo boToUpdate = ActionBo.from(toUpdate);
  
  		// delete any old, existing attributes
  		Map<String,String> fields = new HashMap<String,String>(1);
  		fields.put(PropertyNames.Action.ACTION_ID, toUpdate.getId());
  		businessObjectService.deleteMatching(ActionAttributeBo.class, fields);
          
  		// update the action and create new attributes
          businessObjectService.save(boToUpdate);
  	}
  
 	/**
 	 * This overridden method retrieves an Action from the repository.
 	 */
 	@Override
 	public ActionDefinition getActionByActionId(String actionId) {
 		if (StringUtils.isBlank(actionId)){
             throw new IllegalArgumentException("action ID is null or blank");			
 		}
 		ActionBo bo = businessObjectService.findBySinglePrimaryKey(ActionBo.class, actionId);
 		return ActionBo.to(bo);
 	}
 
 	/**
 	 * This overridden method retrieves an Action from the repository.
 	 */
 	@Override
 	public ActionDefinition getActionByNameAndNamespace(String name, String namespace) {
         if (StringUtils.isBlank(name)) {
             throw new IllegalArgumentException("name is blank");
         }
         if (StringUtils.isBlank(namespace)) {
             throw new IllegalArgumentException("namespace is blank");
         }
 
         final Map<String, Object> map = new HashMap<String, Object>();
         map.put("name", name);
         map.put("namespace", namespace);
 
         ActionBo myAction = businessObjectService.findByPrimaryKey(ActionBo.class, Collections.unmodifiableMap(map));
         return ActionBo.to(myAction);
 	}
 
 	/**
 	 * This overridden method retrieves a List of Actions associated with a Rule.
 	 */
 	@Override
 	public List<ActionDefinition> getActionsByRuleId(String ruleId) {
 		if (StringUtils.isBlank(ruleId)){
             throw new IllegalArgumentException("ruleId is null or blank");			
 		}
         final Map<String, Object> map = new HashMap<String, Object>();
         map.put("ruleId", ruleId);
 		List<ActionBo> bos = (List<ActionBo>) businessObjectService.findMatchingOrderBy(ActionBo.class, map, "sequenceNumber", true);
 		return convertListOfBosToImmutables(bos);
 	}
 
 	/**
 	 * This overridden method retrieves a specific Action associated with a Rule.
 	 */
 	@Override
 	public ActionDefinition getActionByRuleIdAndSequenceNumber(String ruleId, Integer sequenceNumber) {
 		if (StringUtils.isBlank(ruleId)) {
             throw new IllegalArgumentException("ruleId is null or blank");
 		}
 		if (sequenceNumber == null) {
             throw new IllegalArgumentException("sequenceNumber is null");
 		}
         final Map<String, Object> map = new HashMap<String, Object>();
         map.put("ruleId", ruleId);
         map.put("sequenceNumber", sequenceNumber);
 		ActionBo bo = businessObjectService.findByPrimaryKey(ActionBo.class, map);
 		return ActionBo.to(bo);
 	}
 
 	/**
 	 * This method retrieves an ActionAttributeBo by id
 	 *
 	 * @see org.kuali.rice.krms.impl.repository.ActionBoService#getActionsByRuleId(java.lang.String)
 	 */
 	public ActionAttributeBo getActionAttributeById(String attrId) {
 		if (StringUtils.isBlank(attrId)){
             return null;			
 		}
         return businessObjectService.findBySinglePrimaryKey(ActionAttributeBo.class, attrId);
 	}
 
     /**
      * Sets the businessObjectService attribute value.
      *
      * @param businessObjectService The businessObjectService to set.
      */
     public void setBusinessObjectService(final BusinessObjectService businessObjectService) {
         this.businessObjectService = businessObjectService;
     }
 
     /**
      * Converts a List<ActionBo> to an Unmodifiable List<Action>
      *
      * @param actionBos a mutable List<ActionBo> to made completely immutable.
      * @return An unmodifiable List<Action>
      */
     List<ActionDefinition> convertListOfBosToImmutables(final Collection<ActionBo> actionBos) {
     	if (actionBos == null) { return Collections.emptyList(); }
         ArrayList<ActionDefinition> actions = new ArrayList<ActionDefinition>();
         for (ActionBo bo : actionBos) {
             ActionDefinition action = ActionBo.to(bo);
             actions.add(action);
         }
         return Collections.unmodifiableList(actions);
     }
 
 
 }