package org.kuali.student.common.ui.server.gwt;

 import java.util.HashMap;

 import java.util.List;

 import java.util.Map;

 import java.util.UUID;

 import org.apache.commons.lang.StringUtils;

 import org.apache.log4j.Logger;

 import org.kuali.rice.kim.bo.types.dto.AttributeSet;

 import org.kuali.rice.kim.service.IdentityManagementService;

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

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

 import org.kuali.student.common.assembly.transform.AuthorizationFilter;

 import org.kuali.student.common.assembly.transform.MetadataFilter;

 import org.kuali.student.common.assembly.transform.TransformFilter;

 import org.kuali.student.common.assembly.transform.TransformFilter.TransformFilterAction;

 import org.kuali.student.common.assembly.transform.TransformationManager;

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

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

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

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

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

 import org.kuali.student.common.rice.StudentIdentityConstants;

 import org.kuali.student.common.rice.authorization.PermissionType;

 import org.kuali.student.common.ui.client.service.DataSaveResult;

 import org.kuali.student.common.ui.shared.IdAttributes;

 import org.kuali.student.common.util.security.SecurityUtils;

 import org.kuali.student.common.validation.dto.ValidationResultInfo;

 import org.kuali.student.core.assembly.transform.ProposalWorkflowFilter;

 import org.kuali.student.core.proposal.dto.ProposalInfo;

 import org.kuali.student.core.proposal.service.ProposalService;

 import org.springframework.transaction.annotation.Transactional;

 @Transactional(readOnly=true,noRollbackFor={DoesNotExistException.class},rollbackFor={Throwable.class})

 public abstract class AbstractDataService implements DataService{

         private static final long serialVersionUID = 1L;

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

         private TransformationManager transformationManager;

         private IdentityManagementService permissionService;

     //TODO: why do we have this reference in the base class????

         private ProposalService proposalService;

         @Override

         public Data getData(String id) throws OperationFailedException {

                 Map<String, Object> filterProperties = getDefaultFilterProperties();

                 filterProperties.put(TransformFilter.FILTER_ACTION, TransformFilterAction.GET);

                 filterProperties.put(MetadataFilter.METADATA_ID_VALUE, id);

                 String dtoId = id;

                 //First check if this is a proposal id

         //TODO: Igor : Why do we check for this when getting the data for programs?

                 try{

                         if (proposalService != null){

                                 ProposalInfo proposalInfo = proposalService.getProposal(dtoId);

                                 filterProperties.put(ProposalWorkflowFilter.PROPOSAL_INFO, proposalInfo);

                                 dtoId = proposalInfo.getProposalReference().get(0);

                         }                        

                         Object dto = get(dtoId);

                         if (dto != null){

                                 return transformationManager.transform(dto, getDtoClass().getName(), filterProperties);

                         }

                 } catch(DoesNotExistException e){

                         return null;

                 } catch (Exception e) {

                         LOG.error("Error getting data",e);

                         throw new OperationFailedException("Error getting data",e);

                 }

                 return null;

         }

         @Override

         public Metadata getMetadata(String id, Map<String, String> attributes) {

                 Map<String, Object> filterProperties = getDefaultFilterProperties();

                 filterProperties.put(MetadataFilter.METADATA_ID_VALUE, id);

                 //Place id attributes into filter properties

                 String idType = (attributes != null? attributes.get(IdAttributes.ID_TYPE):null);

                 String docType = (attributes != null ? attributes.get(StudentIdentityConstants.DOCUMENT_TYPE_NAME):null);

                 String dtoState = (attributes != null ? attributes.get(DtoConstants.DTO_STATE):null);

                 String dtoNextState = (attributes != null ? attributes.get(DtoConstants.DTO_NEXT_STATE):null);

                 String workflowNode = (attributes != null ? attributes.get(DtoConstants.DTO_WORKFLOW_NODE):null);

                 if (idType == null){

                         filterProperties.remove(MetadataFilter.METADATA_ID_TYPE);

                 } else {

                         filterProperties.put(MetadataFilter.METADATA_ID_TYPE, idType);

                 }

                 if (docType == null){

                         filterProperties.put(ProposalWorkflowFilter.WORKFLOW_DOC_TYPE, getDefaultWorkflowDocumentType());

                 } else {

                         filterProperties.put(ProposalWorkflowFilter.WORKFLOW_DOC_TYPE, docType);

                 }

                 if (dtoState != null){

                         filterProperties.put(DtoConstants.DTO_STATE, dtoState);                        

                 }

                 if (dtoNextState != null){

                         filterProperties.put(DtoConstants.DTO_NEXT_STATE, dtoNextState);                        

                 }

                 if (workflowNode != null){

                         filterProperties.put(DtoConstants.DTO_WORKFLOW_NODE, workflowNode);                        

                 }

                 if (checkDocumentLevelPermissions()){

                         filterProperties.put(AuthorizationFilter.DOC_LEVEL_PERM_CHECK, Boolean.TRUE.toString());

                 }

                 Metadata metadata = transformationManager.getMetadata(getDtoClass().getName(), filterProperties); 

                 return metadata;

         }

         @Override

         @Transactional(readOnly=false,noRollbackFor={DoesNotExistException.class},rollbackFor={Throwable.class})

         public DataSaveResult saveData(Data data) throws OperationFailedException, DataValidationErrorException, VersionMismatchException{

                 Map<String, Object> filterProperties = getDefaultFilterProperties();

                 filterProperties.put(TransformFilter.FILTER_ACTION, TransformFilterAction.SAVE);

                 DataSaveResult saveResult = new DataSaveResult();

                 try {

                         //Convert data object to dto object

                         Object dto = transformationManager.transform(data, getDtoClass(), filterProperties);

                         //This calls save method for DataService impl, which makes the needed service calls to persist dto

                         //The service call should do it's own validation, any errors will cause DataValidationErrorException

                         //and is handled in the catch below.

                         dto = save(dto, filterProperties);

                         //Validate saved data again to get validation warnings that may exist on the data

                         List<ValidationResultInfo> validationResults = validate(dto);

                         //Convert saved data object back to data object to send to UI

                         Data persistedData = transformationManager.transform(dto, getDtoClass().getName(), filterProperties);                        

                         saveResult.setValue(persistedData);

                         saveResult.setValidationResults(validationResults);                        

                 }catch (DataValidationErrorException dvee){

                         //Throw the error, we need the the transaction to be rolled back when service throws an error.

                         throw dvee;

                 }catch (OperationFailedException ofe){

                     throw ofe;

                 }catch (VersionMismatchException vme){

                     throw vme;

                 }catch (Exception e) {

                         LOG.error("Failed to save data",e);

                         throw new OperationFailedException("Failed to save data",e);

                 }

                 return saveResult;

         }

         @Override

         public List<ValidationResultInfo> validateData(Data data) throws OperationFailedException {

                 List<ValidationResultInfo> validationResults;

                 try {

                         Metadata metadata = transformationManager.getUnfilteredMetadata(getDtoClass().getName());

                         Object dto = transformationManager.getMapper().convertFromData(data, getDtoClass(), metadata);

                         validationResults = validate(dto);

                 } catch (Exception e) {

                         throw new OperationFailedException("Unable to validate data", e);

                 }

                 return validationResults;

         }

         @Override

         public Boolean isAuthorized(PermissionType type, Map<String,String> attributes) {

                 String user = SecurityUtils.getCurrentUserId();

                 boolean result = false;

                 if (checkDocumentLevelPermissions()) {

                         if (type == null) {

                                 return null;

                         }

                         String namespaceCode = type.getPermissionNamespace();

                         String permissionTemplateName = type.getPermissionTemplateName();

                         AttributeSet roleQuals = new AttributeSet();

                         if (attributes != null) {                                

                                 if (proposalService != null){

                                         ProposalInfo proposalInfo = null;

                                         try {

                                                 if (attributes.containsKey(IdAttributes.IdType.KS_KEW_OBJECT_ID.toString())){

                                                         proposalInfo = proposalService.getProposal(attributes.get(IdAttributes.IdType.KS_KEW_OBJECT_ID.toString()));

                                                 } else if (attributes.containsKey(IdAttributes.IdType.DOCUMENT_ID.toString())){

                                                         proposalInfo = proposalService.getProposalByWorkflowId(attributes.get(IdAttributes.IdType.DOCUMENT_ID.toString()));

                                                 }

                                                 if (proposalInfo != null){

                                                         attributes.put(IdAttributes.IdType.KS_KEW_OBJECT_ID.toString(), proposalInfo.getId());

                                                         attributes.put(IdAttributes.IdType.DOCUMENT_ID.toString(), proposalInfo.getWorkflowId());

                                                         attributes.put(StudentIdentityConstants.DOCUMENT_TYPE_NAME, proposalInfo.getType());

                                                 }

                                         } catch (Exception e){

                                                 LOG.error("Could not retrieve proposal to determine permission qualifiers.");

                                         }

                                 }

                         //Put in a random number to avoid this request from being cached. Might want to do this only for specific templates to take advantage of caching

                                 attributes.put("RAND_NO_CACHE", UUID.randomUUID().toString());

                                 roleQuals.putAll(attributes);

                         }

                         if (StringUtils.isNotBlank(namespaceCode) && StringUtils.isNotBlank(permissionTemplateName)) {

                                 LOG.info("Checking Permission '" + namespaceCode + "/" + permissionTemplateName + "' for user '" + user + "'");

                                 result = getPermissionService().isAuthorizedByTemplateName(user, namespaceCode, permissionTemplateName, null, roleQuals);

                         }

                         else {

                                 LOG.info("Can not check Permission with namespace '" + namespaceCode + "' and template name '" + permissionTemplateName + "' for user '" + user + "'");

                                 return Boolean.TRUE;

                         }

                 }

                 else {

                         LOG.info("Will not check for document level permissions. Defaulting authorization to true.");

                         result = true;

                 }

                 LOG.info("Result of authorization check for user '" + user + "': " + result);

                 return Boolean.valueOf(result);

         }

         public Map<String, Object> getDefaultFilterProperties(){

                 Map<String, Object> filterProperties = new HashMap<String,Object>();

                 filterProperties.put(MetadataFilter.METADATA_ID_TYPE, StudentIdentityConstants.QUALIFICATION_KEW_OBJECT_ID);

                 filterProperties.put(ProposalWorkflowFilter.WORKFLOW_USER, SecurityUtils.getCurrentUserId());

                 return filterProperties;

         }

         protected DataSaveResult _saveData(Data data, Map<String, Object> filterProperties) throws OperationFailedException{

                 try {

                         filterProperties.put(MetadataFilter.METADATA_ID_VALUE, (String)data.query("id"));        

                         Object dto = transformationManager.transform(data, getDtoClass(),filterProperties);

                         dto = save(dto, filterProperties);

                         Data persistedData = transformationManager.transform(dto,getDtoClass().getName(), filterProperties);

                         return new DataSaveResult(null, persistedData);

                 } catch (DataValidationErrorException dvee){

                         return new DataSaveResult(dvee.getValidationResults(), null);

                 } catch (Exception e) {

                         LOG.error("Unable to save", e);

                         throw new OperationFailedException("Unable to save");

                 }                

         }

         protected boolean checkDocumentLevelPermissions() {

                 return false;

         }

         public TransformationManager getTransformationManager() {

                 return transformationManager;

         }

         public void setTransformationManager(TransformationManager transformationManager) {

                 this.transformationManager = transformationManager;

         }

         public IdentityManagementService getPermissionService() {

                 return permissionService;

         }

         public void setPermissionService(IdentityManagementService permissionService) {

                 this.permissionService = permissionService;

         }

         public ProposalService getProposalService() {

                 return proposalService;

         }

         public void setProposalService(ProposalService proposalService) {

                 this.proposalService = proposalService;

         }

         protected abstract String getDefaultWorkflowDocumentType();

         protected abstract String getDefaultMetaDataState();

         /**

          * Implement this method to make to make service call to get DTO object. The method is called

          * by the get(Data) method before it invokes transformationManager to convert DTO to a Data map 

          * 

          * @param id DTO id

          * @return the dto retrieved by calling the appropriate service method

          * @throws Exception

          */

         protected abstract Object get(String id) throws Exception;

         /**

          * Implement this method to make a service call to get DTO object. The method is called         

          * by the save(Data) method after it invokes transformationManager to convert Data map to DTO 

          * 

          * @param dto

          * @param properties

          * @return the persisted dto object

          * @throws Exception

          */

         protected abstract Object save(Object dto, Map<String, Object> properties) throws Exception;

         /**

          * Implement this method to make a service call to get DTO object. The method is called         

          * in the save(data) method before calling the save(dto,properties) method to validate the data

          * @param dto

          * @return

          * @throws Exception

          */

         protected abstract List<ValidationResultInfo> validate(Object dto) throws Exception;

         /**

          * Implement this method to return the type of the dto object.

          * 

          * @return The object type returned and expected by the get & save dto methods

          */

         protected abstract Class<?> getDtoClass();

 }