package org.kuali.student.lum.lu.assembly;

 import java.util.Iterator;

 import org.apache.commons.lang.StringUtils;

 import org.apache.log4j.Logger;

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

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

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

 import org.kuali.student.common.assembly.data.Data.DataType;

 import org.kuali.student.common.assembly.data.Data.Property;

 import org.kuali.student.common.assembly.dictionary.MetadataServiceImpl;

 import org.kuali.student.common.assembly.old.Assembler;

 import org.kuali.student.common.assembly.old.PassThroughAssemblerFilter;

 import org.kuali.student.common.assembly.old.data.SaveResult;

 import org.kuali.student.common.assembly.util.IdTranslation;

 import org.kuali.student.common.assembly.util.IdTranslator;

 import org.kuali.student.lum.common.client.widgets.CluSetHelper;

 public class CluSetManagementIdTranslatorAssemblerFilter extends PassThroughAssemblerFilter<Data, Void> {

     final Logger LOG = Logger.getLogger(CluSetManagementIdTranslatorAssemblerFilter.class);

     private IdTranslator idTranslator;

     private MetadataServiceImpl metadataService;

     public MetadataServiceImpl getMetadataService() {

         return metadataService;

     }

     public void setMetadataService(MetadataServiceImpl metadataService) {

         this.metadataService = metadataService;

     }

     public CluSetManagementIdTranslatorAssemblerFilter(IdTranslator idTranslator) {

         this.idTranslator = idTranslator;

     }

     @Override

     public void doGetFilter(FilterParamWrapper<String> id, FilterParamWrapper<Data> response, GetFilterChain<Data, Void> chain) throws AssemblyException {

         chain.doGetFilter(id, response);

         Data data = response.getValue(); 

         if (data != null) {

             translateIds(data, chain);

         }

     }

     @Override

     public void doSaveFilter(FilterParamWrapper<Data> request, FilterParamWrapper<SaveResult<Data>> response, SaveFilterChain<Data, Void> chain) throws AssemblyException {

         chain.doSaveFilter(request, response);

         SaveResult<Data> saveResult = response.getValue();

         Data data = saveResult != null && saveResult.getValue() != null ? saveResult.getValue() : null;

         if(data != null) {

             translateIds(data, chain);

         }

     }

     private void translateIds(Data data, AssemblerManagerAccessable<Data, Void> chain) throws AssemblyException {

         CluSetHelper cluSetHelper = new CluSetHelper(data);

         Assembler<Data, Void> a = chain.getManager().getTarget();

         Metadata metadata = null;

         if (cluSetHelper.getType() == null || cluSetHelper.getType().equals("kuali.cluSet.type.CreditCourse")) {

             metadata = metadataService.getMetadata("courseSet");

         } else {

             metadata = metadataService.getMetadata("programSet");

         }

         if (metadata != null && data != null) {

             __translateIds(data, metadata);

         }

     }

     /**

      * Uses the IdTranslator and Metadata to convert IDs into their display text and stores those translations in the

      * _runtimeData node

      * 

      * @param data

      *            the Data instance containing IDs to be translated

      * @param metadata

      *            the Metadata instance representing the data provided.

      * @throws AssemblyException

      */

     private void __translateIds(Data data, Metadata metadata)

             throws AssemblyException {

         try{

             if (data != null && metadata != null) {

                 //Iterate through all the data;s properties

                 for (Iterator<Property> iter = data.realPropertyIterator(); iter.hasNext();) {

                     Property prop = iter.next();

                     Object fieldData = prop.getValue();

                     Object fieldKey = prop.getKey();

                     Metadata fieldMetadata = metadata.getProperties().get(fieldKey);

                     //if the fieldMetadata is null then try to use the parent metadata as in the case of lists

                     if(fieldMetadata==null){

                         fieldMetadata=metadata;

                     }

                     //If the fieldData is Data itself the recurse

                     if (fieldData instanceof Data) {

                         if (DataType.LIST.equals(fieldMetadata.getDataType())) {

                             //Lists are a special case where the metadata property name is "*"

                             Metadata listChildMetadata = fieldMetadata.getProperties().get("*");

                             //see if this is a list of data or a list of fields

                             if(DataType.DATA.equals(listChildMetadata.getDataType())){

                                 __translateIds((Data) prop.getValue(), listChildMetadata);

                             }else{

                                 //its a list of fields so loop through and translate using the "index"

                                 for(Iterator<Property> listIter = ((Data)fieldData).realPropertyIterator(); listIter.hasNext();){

                                     Property listItem = listIter.next();

                                     Object listData = listItem.getValue();

                                     if (listData != null && listData instanceof String) {

                                         if (fieldMetadata.getInitialLookup() != null

                                                 && !StringUtils.isEmpty((String) listData)) {

                                             //This is a string with a lookup so do the translation

                                             IdTranslation trans = idTranslator.getTranslation(fieldMetadata.getInitialLookup(), (String) listData);

                                             if (trans != null) {

                                                 Integer index = listItem.getKey();

                                                 setTranslation((Data)fieldData, listItem.getKey().toString(), index, trans.getDisplay());

                                             }

                                         }

                                     }

                                 }

                             }

                         } else {

                             //Otherwise just use the fieldMetadata

                             __translateIds((Data) prop.getValue(), fieldMetadata);

                         }

                     } else if (fieldData != null && fieldData instanceof String) {

                         if (fieldMetadata.getInitialLookup() != null

                                 && !StringUtils.isEmpty((String) fieldData)) {

                             //This is a string with a lookup so do the translation

                             IdTranslation trans = idTranslator.getTranslation(fieldMetadata.getInitialLookup(), (String) fieldData);

                             if (trans != null) {

                                 setTranslation(data, prop.getKey().toString(), null, trans.getDisplay());

                             }

                         }

                     }

                 }

             }

         }catch(Exception e){

             LOG.error("Error translating", e);

         }

     }

     private static void setTranslation(Data data, String field, Integer index, String translation) {

         if (data != null) {

             //Get runtime data for the node and create if it doesn't exist

             Data runtime = data.get("_runtimeData");

             if (runtime == null) {

                 runtime = new Data();

                 data.set("_runtimeData", runtime);

             }

             if(index != null) {

                 //If the index is set this is a list item (foo/bar/0/, foo/bar/1/)

                 Data fieldIndexData = runtime.get(index);

                 if(fieldIndexData==null){

                     fieldIndexData = new Data();

                     runtime.set(index, fieldIndexData);

                 }

                 fieldIndexData.set("id-translation", translation);

             }else{

                 //Otherwise set the translation directly referenced by the field

                 //If the index is set this is a list item (foo/bar/0/, foo/bar/1/)

                 Data fieldData = runtime.get(field);

                 if(fieldData==null){

                     fieldData = new Data(); 

                     runtime.set(field, fieldData);

                 }

                 fieldData.set("id-translation", translation);

             }

         }

     }

 }