/**

  *

  */

 package org.kuali.student.lum.program.service.impl;

 import static org.apache.commons.collections.CollectionUtils.isEmpty;

 import static org.apache.commons.lang.StringUtils.isEmpty;

 import java.util.HashMap;

 import java.util.List;

 import java.util.Map;

 import org.apache.log4j.Logger;

 import org.kuali.student.common.assembly.BOAssembler;

 import org.kuali.student.common.assembly.BaseDTOAssemblyNode;

 import org.kuali.student.common.assembly.BaseDTOAssemblyNode.NodeOperation;

 import org.kuali.student.common.assembly.data.AssemblyException;

 import org.kuali.student.common.dto.DtoConstants;

 import org.kuali.student.common.exceptions.DoesNotExistException;

 import org.kuali.student.common.exceptions.InvalidParameterException;

 import org.kuali.student.common.exceptions.MissingParameterException;

 import org.kuali.student.common.exceptions.OperationFailedException;

 import org.kuali.student.common.util.UUIDHelper;

 import org.kuali.student.core.statement.dto.RefStatementRelationInfo;

 import org.kuali.student.core.statement.dto.StatementTreeViewInfo;

 import org.kuali.student.core.statement.service.StatementService;

 import org.kuali.student.core.statement.service.assembler.StatementTreeViewAssembler;

 import org.kuali.student.lum.course.service.assembler.LoAssembler;

 import org.kuali.student.lum.lo.service.LearningObjectiveService;

 import org.kuali.student.lum.lu.dto.CluCluRelationInfo;

 import org.kuali.student.lum.lu.dto.CluIdentifierInfo;

 import org.kuali.student.lum.lu.dto.CluInfo;

 import org.kuali.student.lum.lu.service.LuService;

 import org.kuali.student.lum.program.dto.ProgramRequirementInfo;

 import org.kuali.student.lum.program.service.assembler.ProgramAssemblerConstants;

 import org.kuali.student.lum.program.service.assembler.ProgramAssemblerUtils;

 import org.kuali.student.lum.service.assembler.CluAssemblerUtils;

 /**

  * @author glindholm

  *

  */

 public class ProgramRequirementAssembler implements BOAssembler<ProgramRequirementInfo, CluInfo> {

     final static Logger LOG = Logger.getLogger(ProgramRequirementAssembler.class);

         private StatementService statementService;

         private StatementTreeViewAssembler statementTreeViewAssembler;

         private LearningObjectiveService loService;

         private LuService luService;

         private LoAssembler loAssembler;

         private CluAssemblerUtils cluAssemblerUtils;

     private ProgramAssemblerUtils programAssemblerUtils;

         @Override

         public ProgramRequirementInfo assemble(CluInfo clu,

                         ProgramRequirementInfo progReqInfo, boolean shallowBuild)

                         throws AssemblyException {

                 ProgramRequirementInfo progReq = (progReqInfo != null ? progReqInfo : new ProgramRequirementInfo());

                 if (clu.getOfficialIdentifier() != null) {

                         progReq.setShortTitle(clu.getOfficialIdentifier().getShortName());

                         progReq.setLongTitle(clu.getOfficialIdentifier().getLongName());

                 }

                 progReq.setDescr(clu.getDescr());

                 //assembling minCredits & maxCredits

                 assembleCredits(clu, progReq);

                 if (progReq.getStatement() == null) {

                         try {

                                 List<RefStatementRelationInfo> relations = statementService.getRefStatementRelationsByRef(ProgramAssemblerConstants.PROGRAM_REQUIREMENT, clu.getId());

                                 StatementTreeViewInfo statementTree = new StatementTreeViewInfo();

                                 if (relations != null) {

                                         statementTreeViewAssembler.assemble(statementService.getStatementTreeView(relations.get(0).getStatementId()), statementTree, shallowBuild);

                                 }

                                 progReq.setStatement(statementTree);

                         } catch (AssemblyException e) {

                                 throw e;

                         } catch (Exception e) {

                                 throw new AssemblyException(e);

                         }

                 }

                 if (isEmpty(progReq.getLearningObjectives())) {

                         progReq.setLearningObjectives(cluAssemblerUtils.assembleLos(clu.getId(), shallowBuild));

                 }

                 progReq.setMetaInfo(clu.getMetaInfo());

                 progReq.setType(clu.getType());

                 progReq.setAttributes(clu.getAttributes());

                 progReq.setId(clu.getId());

                 return progReq;

         }

         @Override

         public BaseDTOAssemblyNode<ProgramRequirementInfo, CluInfo> disassemble(

                         ProgramRequirementInfo progReq, NodeOperation operation)

                         throws AssemblyException {

                 if (progReq == null) {

                         // FIXME Unsure now if this is an exception or just return null or

                         // empty assemblyNode

                     LOG.error("ProgramRequirementInfo to disassemble is null!");

                         throw new AssemblyException("ProgramRequirementInfo can not be null");

                 }

                 BaseDTOAssemblyNode<ProgramRequirementInfo, CluInfo> result = new BaseDTOAssemblyNode<ProgramRequirementInfo, CluInfo>(null);

                 // Create the Statement Tree

         StatementTreeViewInfo statement = progReq.getStatement();

         statement.setId(UUIDHelper.genStringUUID(statement.getId()));

         BaseDTOAssemblyNode<StatementTreeViewInfo, StatementTreeViewInfo> statementTree;

                 try {

                         statementTree = statementTreeViewAssembler.disassemble(statement, operation);

                 } catch (AssemblyException e) {

                         throw e;

                 } catch (Exception e) {

                         throw new AssemblyException(e);

                 }

         result.getChildNodes().add(statementTree);

                 CluInfo clu;

                 try {

                         clu = (NodeOperation.UPDATE == operation) ?  luService.getClu(progReq.getId()) : new CluInfo();

         } catch (Exception e) {

                         throw new AssemblyException("Error getting existing learning unit during program requirement update", e);

         }

         if (operation.equals(NodeOperation.DELETE)) {

             try {

                                 final List<CluCluRelationInfo> relations = luService.getCluCluRelationsByClu(progReq.getId());

                     final BaseDTOAssemblyNode<ProgramRequirementInfo, CluCluRelationInfo> cluRelation = new BaseDTOAssemblyNode<ProgramRequirementInfo, CluCluRelationInfo>(null);

                     if (relations.size() > 1) {

                             throw new AssemblyException("Unable to dissamble ProgramRequirement, more than one CluCluRelation found");

                     } else if (relations.size() == 1) {

                             cluRelation.setNodeData(relations.get(0));

                             cluRelation.setOperation(operation);

                             result.getChildNodes().add(cluRelation);

                     }

                         } catch (Exception e) {

                                 throw new AssemblyException(e);

                         }

         }

         BaseDTOAssemblyNode<ProgramRequirementInfo, CluInfo> cluResult = new BaseDTOAssemblyNode<ProgramRequirementInfo, CluInfo>(this);

         cluResult.setNodeData(clu);

         cluResult.setBusinessDTORef(progReq);

         cluResult.setOperation(operation);

         result.getChildNodes().add(cluResult);

         programAssemblerUtils.disassembleBasics(clu, progReq);

                 //disassembling minCredits & maxCredits

         disassembleCredits(clu, progReq);

         progReq.setId(clu.getId());

         CluIdentifierInfo official = null != clu.getOfficialIdentifier() ? clu.getOfficialIdentifier() : new CluIdentifierInfo();

         official.setLongName(progReq.getLongTitle());

         official.setShortName(progReq.getShortTitle());

         official.setState(!isEmpty(clu.getState()) ? clu.getState() : DtoConstants.STATE_ACTIVE);

         // gotta be this type

         official.setType(ProgramAssemblerConstants.OFFICIAL);

         clu.setOfficialIdentifier(official);

         clu.setDescr(progReq.getDescr());

         clu.setState(!isEmpty(clu.getState()) ? clu.getState() : DtoConstants.STATE_ACTIVE);

         if (progReq.getLearningObjectives() != null) {

             disassembleLearningObjectives(progReq, operation, result);

         }

         RefStatementRelationInfo relation;

         if (operation == NodeOperation.CREATE) {

             relation = new RefStatementRelationInfo();

             relation.setId(UUIDHelper.genStringUUID(null));

         } else {

                 try {

                         relation = statementService.getRefStatementRelationsByRef(ProgramAssemblerConstants.PROGRAM_REQUIREMENT, clu.getId()).get(0);

                         } catch (Exception e) {

                                 throw new AssemblyException("Unable to find RefStatementRelation", e);

                         }

         }

         //relation.setType("clu.prerequisites"); // FIXME Derive from statement and rule types

         relation.setType(ProgramAssemblerConstants.PROGRAM_REFERENCE_TYPE);

         relation.setRefObjectId(clu.getId());

         relation.setRefObjectTypeKey(ProgramAssemblerConstants.PROGRAM_REQUIREMENT);

         relation.setStatementId(statement.getId());

         relation.setState(DtoConstants.STATE_ACTIVE);

         BaseDTOAssemblyNode<ProgramRequirementInfo, RefStatementRelationInfo> relationNode = new BaseDTOAssemblyNode<ProgramRequirementInfo, RefStatementRelationInfo>(null);

         relationNode.setNodeData(relation);

         relationNode.setOperation(operation);

         result.getChildNodes().add(relationNode);

         result.setBusinessDTORef(progReq);

         result.setOperation(operation);

                 return result;

         }

         private void disassembleLearningObjectives(ProgramRequirementInfo progReq,

                         NodeOperation operation,

                         BaseDTOAssemblyNode<ProgramRequirementInfo, CluInfo> result) throws AssemblyException {

         try {

             List<BaseDTOAssemblyNode<?, ?>> loResults = cluAssemblerUtils.disassembleLos(progReq.getId(), progReq.getState(),  progReq.getLearningObjectives(), operation);

             if (loResults != null) {

                 result.getChildNodes().addAll(loResults);

             }

         } catch (DoesNotExistException e) {

         } catch (Exception e) {

             throw new AssemblyException("Error while disassembling los", e);

         }

         }

         private void disassembleCredits(CluInfo clu, ProgramRequirementInfo progReq){

                 Map<String,String> attributes = null != clu.getAttributes() ? clu.getAttributes() : new HashMap<String,String>();

                 if(progReq.getMinCredits() != null){

                         attributes.put(ProgramAssemblerConstants.MIN_CREDITS, Integer.toString(progReq.getMinCredits()));

                 }else{

                         attributes.put(ProgramAssemblerConstants.MIN_CREDITS, null);

                 }

                 if(progReq.getMaxCredits() != null) {

                         attributes.put(ProgramAssemblerConstants.MAX_CREDITS, Integer.toString(progReq.getMaxCredits()));

                 }else{

                         attributes.put(ProgramAssemblerConstants.MAX_CREDITS, null);

                 }

                 clu.setAttributes(attributes);

         }

         private void assembleCredits(CluInfo clu, ProgramRequirementInfo progReq){

                 Map<String,String> attributes = clu.getAttributes();

                 if(attributes != null){

                         String minCredits = attributes.get(ProgramAssemblerConstants.MIN_CREDITS);

                         String maxCredits = attributes.get(ProgramAssemblerConstants.MAX_CREDITS);

                         progReq.setMinCredits(isEmpty(minCredits)?null:Integer.parseInt(minCredits));

                         progReq.setMaxCredits(isEmpty(maxCredits)?null:Integer.parseInt(maxCredits));

                 }

         }

         public StatementTreeViewAssembler getStatementTreeViewAssembler() {

                 return statementTreeViewAssembler;

         }

         public void setStatementTreeViewAssembler(

                         StatementTreeViewAssembler statementTreeViewAssembler) {

                 this.statementTreeViewAssembler = statementTreeViewAssembler;

         }

         public StatementService getStatementService() {

                 return statementService;

         }

         public void setStatementService(StatementService statementService) {

                 this.statementService = statementService;

         }

         public LearningObjectiveService getLoService() {

                 return loService;

         }

         public void setLoService(LearningObjectiveService loService) {

                 this.loService = loService;

         }

         public LuService getLuService() {

                 return luService;

         }

         public void setLuService(LuService luService) {

                 this.luService = luService;

         }

         public LoAssembler getLoAssembler() {

                 return loAssembler;

         }

         public void setLoAssembler(LoAssembler loAssembler) {

                 this.loAssembler = loAssembler;

         }

         public CluAssemblerUtils getCluAssemblerUtils() {

                 return cluAssemblerUtils;

         }

         public void setCluAssemblerUtils(CluAssemblerUtils cluAssemblerUtils) {

                 this.cluAssemblerUtils = cluAssemblerUtils;

         }

         public ProgramAssemblerUtils getProgramAssemblerUtils() {

                 return programAssemblerUtils;

         }

         public void setProgramAssemblerUtils(ProgramAssemblerUtils programAssemblerUtils) {

                 this.programAssemblerUtils = programAssemblerUtils;

         }

 }