package org.kuali.student.lum.program.server;

 import java.util.ArrayList;

 import java.util.HashMap;

 import java.util.List;

 import java.util.Map;

 import org.kuali.student.common.ui.client.widgets.rules.ReqComponentInfoUi;

 import org.kuali.student.common.ui.client.widgets.rules.RulesUtil;

 import org.kuali.student.common.ui.server.gwt.DataGwtServlet;

 import org.kuali.student.core.dto.RichTextInfo;

 import org.kuali.student.core.dto.StatusInfo;

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

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

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

 import org.kuali.student.core.versionmanagement.dto.VersionDisplayInfo;

 import org.kuali.student.lum.program.client.requirements.ProgramRequirementsDataModel;

 import org.kuali.student.lum.program.client.requirements.ProgramRequirementsSummaryView;

 import org.kuali.student.lum.program.client.rpc.MajorDisciplineRpcService;

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

 import org.kuali.student.lum.program.service.ProgramService;

 import org.kuali.student.lum.program.service.ProgramServiceConstants;

 public class MajorDisciplineRpcServlet extends DataGwtServlet implements MajorDisciplineRpcService {

     private static final long serialVersionUID = 1L;

     private ProgramService programService;

     private StatementService statementService;

     public List<ProgramRequirementInfo> getProgramRequirements(List<String> programRequirementIds) throws Exception {

         List<ProgramRequirementInfo> programReqInfos = new ArrayList<ProgramRequirementInfo>();

         for (String programReqId : programRequirementIds) {

             ProgramRequirementInfo rule = programService.getProgramRequirement(programReqId, null, null);

             setProgReqNL(rule);

             programReqInfos.add(rule);

         }

         return programReqInfos;

     }

     public Map<Integer, ProgramRequirementInfo> storeProgramRequirements(Map<Integer, ProgramRequirementsDataModel.requirementState> states,

                                                                         Map<Integer, ProgramRequirementInfo> progReqs) throws Exception {

         Map<Integer, ProgramRequirementInfo> storedRules = new HashMap<Integer, ProgramRequirementInfo>();

         for (Integer key : progReqs.keySet()) {

             ProgramRequirementInfo rule = progReqs.get(key);

             switch (states.get(key)) {

                 case STORED:

                     //rule was not changed so continue

                     storedRules.put(key, null);

                     break;

                 case ADDED:

                     storedRules.put(key, createProgramRequirement(rule));

                     break;

                 case EDITED:

                     storedRules.put(key, updateProgramRequirement(rule));

                     break;

                 case DELETED:

                     storedRules.put(key, null);

                     deleteProgramRequirement(rule.getId());

                     break;

                 default:

                     break;

             }

         }

         return storedRules;

     }

     public ProgramRequirementInfo createProgramRequirement(ProgramRequirementInfo programRequirementInfo) throws Exception {

         if (programRequirementInfo.getId().indexOf(ProgramRequirementsSummaryView.NEW_PROG_REQ_ID) >= 0) {

             programRequirementInfo.setId(null);

         }

         ProgramRequirementsDataModel.stripStatementIds(programRequirementInfo.getStatement());

         ProgramRequirementInfo rule = programService.createProgramRequirement(programRequirementInfo);

         setProgReqNL(rule);

         return rule;

     }

     public StatusInfo deleteProgramRequirement(String programRequirementId) throws Exception {

         return programService.deleteProgramRequirement(programRequirementId);

     }

     public ProgramRequirementInfo updateProgramRequirement(ProgramRequirementInfo programRequirementInfo) throws Exception {

         ProgramRequirementsDataModel.stripStatementIds(programRequirementInfo.getStatement());

         //TODO temporary fix - see KSLUM 1421

         if (programRequirementInfo.getDescr() == null) {

             programRequirementInfo.setDescr(new RichTextInfo());    

         }

         ProgramRequirementInfo rule = programService.updateProgramRequirement(programRequirementInfo);

         setProgReqNL(rule);

         return rule;

     }

     private void setProgReqNL(ProgramRequirementInfo programRequirementInfo) throws Exception {

         setReqCompNL(programRequirementInfo.getStatement());

     }

     private void setReqCompNL(StatementTreeViewInfo tree) throws Exception {

         List<StatementTreeViewInfo> statements = tree.getStatements();

         List<ReqComponentInfo> reqComponentInfos = tree.getReqComponents();

          if ((statements != null) && (statements.size() > 0)) {

             // retrieve all statements

             for (StatementTreeViewInfo statement : statements) {

                 setReqCompNL(statement); // inside set the children of this statementTreeViewInfo

             }

         } else if ((reqComponentInfos != null) && (reqComponentInfos.size() > 0)) {

             // retrieve all req. component LEAFS

                 for (int i = 0; i < reqComponentInfos.size(); i++) {

                         ReqComponentInfoUi reqUi = RulesUtil.clone(reqComponentInfos.get(i));

                         reqUi.setNaturalLanguageTranslation(statementService.translateReqComponentToNL(reqUi, "KUALI.RULE", "en"));

                         reqUi.setPreviewNaturalLanguageTranslation(statementService.translateReqComponentToNL(reqUi, "KUALI.RULE.PREVIEW", "en"));

                         reqComponentInfos.set(i, reqUi);

                 }

         }

     }

     @Override

         public Boolean isLatestVersion(String versionIndId, Long versionSequenceNumber) throws Exception {

             VersionDisplayInfo versionDisplayInfo = programService.getLatestVersion(ProgramServiceConstants.PROGRAM_NAMESPACE_MAJOR_DISCIPLINE_URI, versionIndId);

             Long latestSequenceNumber = versionDisplayInfo.getSequenceNumber();

             boolean isLatest = latestSequenceNumber.equals(versionSequenceNumber); 

             return isLatest;

         }

         public void setProgramService(ProgramService programService) {

         this.programService = programService;

     }

     public void setStatementService(StatementService statementService) {

         this.statementService = statementService;

     }

 }