/*
    * Copyright 2007 The Kuali Foundation
    *
    * Licensed under the Educational Community License, Version 1.0 (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/ecl1.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.student.lum.service.assembler;
  
  import org.kuali.student.core.assembly.BaseDTOAssemblyNode;
  import org.kuali.student.core.assembly.BaseDTOAssemblyNode.NodeOperation;
  import org.kuali.student.core.assembly.data.AssemblyException;
  import org.kuali.student.core.dto.RichTextInfo;
  import org.kuali.student.core.exceptions.DoesNotExistException;
  import org.kuali.student.core.exceptions.InvalidParameterException;
  import org.kuali.student.core.exceptions.MissingParameterException;
  import org.kuali.student.core.exceptions.OperationFailedException;
  import org.kuali.student.lum.course.dto.LoDisplayInfo;
  import org.kuali.student.lum.course.service.assembler.LoAssembler;
  import org.kuali.student.lum.lo.dto.LoInfo;
  import org.kuali.student.lum.lo.service.LearningObjectiveService;
  import org.kuali.student.lum.lu.dto.CluLoRelationInfo;
  import org.kuali.student.lum.lu.dto.CluResultInfo;
  import org.kuali.student.lum.lu.dto.ResultOptionInfo;
  import org.kuali.student.lum.lu.service.LuService;
  
  import java.util.ArrayList;
  import java.util.Date;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Map.Entry;
  
  /**
   * This is a description of what this class does - jimt don't forget to fill this in.
   *
   * @author Kuali Rice Team (kuali-rice@googlegroups.com)
   *
   */
  public class CluAssemblerUtils {
      private LuService luService;
      private LearningObjectiveService loService;
      private LoAssembler loAssembler;
  
      public List<String> assembleCluResults(List<String> resultTypes, List<CluResultInfo> cluResults) throws AssemblyException{
  		if(resultTypes==null){
  			throw new AssemblyException("result types can not be null");
  		}
  		List<String> results = new ArrayList<String>();
  		//Loop through all the CluResults to find those with the matching types
  		for(CluResultInfo cluResult:cluResults){
  			if(resultTypes.contains(cluResult.getType())){
  				//Loop through all options and add to the list of Strings
  				for(ResultOptionInfo resultOption: cluResult.getResultOptions()){
  					results.add(resultOption.getResultComponentId());
  				}
  			}
  		}
  		return results;
  	}
  
      public BaseDTOAssemblyNode<?, ?> disassembleCluResults(String cluId,
  			String cluState, List<String> options, NodeOperation operation, String resultType,
  			String resultsDescription, String resultDescription) throws AssemblyException {
  		BaseDTOAssemblyNode<List<String>, CluResultInfo> cluResultNode = new BaseDTOAssemblyNode<List<String>, CluResultInfo>(null);
  		if(resultType==null){
  			throw new AssemblyException("resultType can not be null");
  		}
  
  		// Get the current options and put them in a map of option type id/cluResult
  		Map<String, ResultOptionInfo> currentResults = new HashMap<String, ResultOptionInfo>();
  
  		CluResultInfo cluResult = null;
  
          //TODO Check this for proper handling of multiple CluResultInfos?  
  		//If this is not a create, lookup the results for this clu
  		if (!NodeOperation.CREATE.equals(operation)) {
  			try {
  				List<CluResultInfo> cluResultList = luService.getCluResultByClu(cluId);
  
  				for (CluResultInfo currentResult : cluResultList) {
  					if (resultType.equals(currentResult.getType())) {
  						cluResult = currentResult;
  						if(NodeOperation.DELETE.equals(operation)){
  							//if this is a delete, then we only need the CluResultInfo
  							cluResultNode.setOperation(NodeOperation.DELETE);
  						}else{
  							//Find all the Result options and store in a map for easy access later
  							cluResultNode.setOperation(NodeOperation.UPDATE);
  							for(ResultOptionInfo resultOption:currentResult.getResultOptions()){
  								currentResults.put(resultOption.getResultComponentId(), resultOption);
 							}
 						}
 					}
 				}
 			} catch (DoesNotExistException e) {
 			} catch (InvalidParameterException e) {
 				throw new AssemblyException("Error getting related " + resultsDescription, e);
 			} catch (MissingParameterException e) {
 				throw new AssemblyException("Error getting related " + resultsDescription, e);
 			} catch (OperationFailedException e) {
 				throw new AssemblyException("Error getting related " + resultsDescription, e);
 			}
 		}
 
 		//If this is a delete we don't need the result options, just the CluResultInfo
 		if(!NodeOperation.DELETE.equals(operation)){
 			if(cluResult == null){
 				//Create a new resultInfo of the given type if one does not exist and set operation to Create
 				cluResult = new CluResultInfo();
 				cluResult.setCluId(cluId);
 				cluResult.setState(cluState);
 				cluResult.setType(resultType);
 				RichTextInfo desc = new RichTextInfo();
 				desc.setPlain(resultsDescription);
 				cluResult.setDesc(desc);
 				cluResult.setEffectiveDate(new Date());
 				cluResultNode.setOperation(NodeOperation.CREATE);
 			}
 
 			cluResult.setResultOptions(new ArrayList<ResultOptionInfo>());
 
 			// Loop through all the credit options in this clu
 			for (String optionType : options) {
 				if(currentResults.containsKey(optionType)){
 					//If the option exists already copy it to the new list of result options
 					ResultOptionInfo resultOptionInfo = currentResults.get(optionType);
 					cluResult.getResultOptions().add(resultOptionInfo);
 				}else{
 					//Otherwise create a new result option
 					ResultOptionInfo resultOptionInfo = new ResultOptionInfo();
 					RichTextInfo desc = new RichTextInfo();
 					desc.setPlain(resultDescription);
 					resultOptionInfo.setDesc(desc);
 					resultOptionInfo.setResultComponentId(optionType);
 					resultOptionInfo.setState(cluState);
 
 					cluResult.getResultOptions().add(resultOptionInfo);
 				}
 			}
 		}
 
 		cluResultNode.setNodeData(cluResult);
 		return cluResultNode;
 	}
 
     public List<LoDisplayInfo> assembleLos(String cluId, boolean shallowBuild) throws AssemblyException {
         List<LoDisplayInfo> loInfos = new ArrayList<LoDisplayInfo>();
         try {
             List<CluLoRelationInfo> cluLoRelations = luService.getCluLoRelationsByClu(cluId);
             for (CluLoRelationInfo cluLoRelation : cluLoRelations) {
                 String loId = cluLoRelation.getLoId();
                 LoInfo lo = loService.getLo(loId);
                 loInfos.add(loAssembler.assemble(lo, null, shallowBuild));
             }
         } catch (Exception e) {
             throw new AssemblyException("Error getting learning objectives", e);
         }
 
         return loInfos;
     }
     
 	public List<BaseDTOAssemblyNode<?, ?>> disassembleLos(String cluId, String cluState, List<LoDisplayInfo> loInfos,
 			NodeOperation operation) throws AssemblyException, DoesNotExistException, InvalidParameterException, MissingParameterException, OperationFailedException{
 		// TODO Auto-generated method stub
 		List<BaseDTOAssemblyNode<?, ?>> results = new ArrayList<BaseDTOAssemblyNode<?, ?>>();
 
 		// Get the current formats and put them in a map of format id/relation
 		// id
 		Map<String, CluLoRelationInfo> currentCluLoRelations = new HashMap<String, CluLoRelationInfo>();
 		try {
 			List<CluLoRelationInfo> cluLoRelations = luService.getCluLoRelationsByClu(cluId);
 			for(CluLoRelationInfo cluLoRelation:cluLoRelations){
 				if(CluAssemblerConstants.CLU_LO_CLU_SPECIFIC_RELATION.equals(cluLoRelation.getType())){
 					currentCluLoRelations.put(cluLoRelation.getLoId(), cluLoRelation);
 				}
 			}
 		} catch (DoesNotExistException e) {
 		} catch (Exception e) {
 			throw new AssemblyException("Error finding related Los", e);
 		}
 
 		// Loop through all the los in this clu
 		for(LoDisplayInfo loDisplay : loInfos){
 
 			// If this is a clu create/new lo update then all los will be created
 		    if (NodeOperation.CREATE == operation
 		            || (NodeOperation.UPDATE == operation &&  !currentCluLoRelations.containsKey(loDisplay.getLoInfo().getId()))) {
 
                 // the lo does not exist, so create
                 // Assemble and add the lo
 		    	loDisplay.getLoInfo().setId(null);
                 BaseDTOAssemblyNode<LoDisplayInfo, LoInfo> loNode = loAssembler
                         .disassemble(loDisplay, NodeOperation.CREATE);
                 results.add(loNode);
 
                 // Create the relationship and add it as well
                 CluLoRelationInfo relation = new CluLoRelationInfo();
                 relation.setCluId(cluId);
                 relation.setLoId(loNode.getNodeData().getId());
                 relation.setType(CluAssemblerConstants.CLU_LO_CLU_SPECIFIC_RELATION);
                 relation.setState(cluState);
 
                 BaseDTOAssemblyNode<LoDisplayInfo, CluLoRelationInfo> relationNode = new BaseDTOAssemblyNode<LoDisplayInfo, CluLoRelationInfo>(
                         null);
                 relationNode.setNodeData(relation);
                 relationNode.setOperation(NodeOperation.CREATE);
 
                 results.add(relationNode);
             } else if (NodeOperation.UPDATE == operation
 					&& currentCluLoRelations.containsKey(loDisplay.getLoInfo().getId())) {
 				// If the clu already has this lo, then just update the lo
                 BaseDTOAssemblyNode<LoDisplayInfo, LoInfo> loNode = loAssembler
                 		.disassemble(loDisplay, NodeOperation.UPDATE);
 				results.add(loNode);
 
 				// remove this entry from the map so we can tell what needs to
 				// be deleted at the end
 				currentCluLoRelations.remove(loDisplay.getLoInfo().getId());
 			} else if (NodeOperation.DELETE == operation
                     && currentCluLoRelations.containsKey(loDisplay.getLoInfo().getId())) {
 
                 // Delete the Format and its relation
 				CluLoRelationInfo relationToDelete = currentCluLoRelations.get(loDisplay.getLoInfo().getId());
                 BaseDTOAssemblyNode<LoDisplayInfo, CluLoRelationInfo> relationToDeleteNode = new BaseDTOAssemblyNode<LoDisplayInfo, CluLoRelationInfo>(
                         null);
                 relationToDeleteNode.setNodeData(relationToDelete);
                 relationToDeleteNode.setOperation(NodeOperation.DELETE);
                 results.add(relationToDeleteNode);
 
                 BaseDTOAssemblyNode<LoDisplayInfo, LoInfo> loNode = loAssembler
         				.disassemble(loDisplay, NodeOperation.DELETE);
                 results.add(loNode);
 
                 // remove this entry from the map so we can tell what needs to
                 // be deleted at the end
                 currentCluLoRelations.remove(loDisplay.getLoInfo().getId());
 			}
 		}
 
         // Now any leftover lo ids are no longer needed, so delete
         // los and relations
         for (Entry<String, CluLoRelationInfo> entry : currentCluLoRelations.entrySet()) {
             // Create a new relation with the id of the relation we want to
             // delete
         	CluLoRelationInfo relationToDelete = entry.getValue();
             BaseDTOAssemblyNode<LoDisplayInfo, CluLoRelationInfo> relationToDeleteNode = new BaseDTOAssemblyNode<LoDisplayInfo, CluLoRelationInfo>(
                     null);
             relationToDeleteNode.setNodeData(relationToDelete);
             relationToDeleteNode.setOperation(NodeOperation.DELETE);
             results.add(relationToDeleteNode);
 
             LoInfo loToDelete = loService.getLo(entry.getKey());
             LoDisplayInfo loDisplayToDelete = loAssembler.assemble(loToDelete, null, false);
             BaseDTOAssemblyNode<LoDisplayInfo, LoInfo> loNode = loAssembler
             		.disassemble(loDisplayToDelete, NodeOperation.DELETE);
             results.add(loNode);
         }
 
 		return results;
 	}
 
     // Spring setters
     public void setLuService(LuService luService) {
         this.luService = luService;
     }
 
     public void setLoService(LearningObjectiveService loService) {
         this.loService = loService;
     }
 
     public void setLoAssembler(LoAssembler loAssembler) {
         this.loAssembler = loAssembler;
     }
 }