/**

  * Copyright 2005-2011 The Kuali Foundation

  *

  * Licensed under the Educational Community License, Version 2.0 (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/ecl2.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.rice.kim.document.rule;

 import org.apache.commons.lang.StringUtils;

 import org.kuali.rice.core.api.uif.RemotableAttributeError;

 import org.kuali.rice.core.api.util.RiceKeyConstants;

 import org.kuali.rice.kim.api.common.template.Template;

 import org.kuali.rice.kim.api.services.KimApiServiceLocator;

 import org.kuali.rice.kim.api.type.KimType;

 import org.kuali.rice.kim.impl.permission.GenericPermissionBo;

 import org.kuali.rice.kim.impl.permission.PermissionBo;

 import org.kuali.rice.kim.impl.permission.PermissionTemplateBo;

 import org.kuali.rice.kim.framework.permission.PermissionTypeService;

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

 import org.kuali.rice.kns.document.MaintenanceDocument;

 import org.kuali.rice.kns.maintenance.rules.MaintenanceDocumentRuleBase;

 import org.kuali.rice.krad.util.GlobalVariables;

 import java.util.List;

 import java.util.Map;

 import java.util.regex.Matcher;

 import java.util.regex.Pattern;

 /**

  * This is a description of what this class does - kellerj don't forget to fill this in. 

  * 

  * @author Kuali Rice Team (rice.collab@kuali.org)

  *

  */

 public class GenericPermissionMaintenanceDocumentRule extends MaintenanceDocumentRuleBase {

         protected static final String DETAIL_VALUES_PROPERTY = "detailValues";

         protected static final String ERROR_MESSAGE_PREFIX = "error.document.kim.genericpermission.";

         protected static final String ERROR_MISSING_TEMPLATE = ERROR_MESSAGE_PREFIX + "missingtemplate";

         protected static final String ERROR_UNKNOWN_ATTRIBUTE = ERROR_MESSAGE_PREFIX + "unknownattribute";

         protected static final String ERROR_ATTRIBUTE_VALIDATION = ERROR_MESSAGE_PREFIX + "attributevalidation";

         @Override

         protected boolean processCustomRouteDocumentBusinessRules(MaintenanceDocument document) {

                 boolean rulesPassed = true;

                 try {

                         GenericPermissionBo perm = (GenericPermissionBo)getNewBo();

                         validateDetailValuesFormat(perm.getDetailValues());

                         // detailValues

                         // get the type from the template for validation

                         Template template = KimApiServiceLocator.getPermissionService().getPermissionTemplate(perm.getTemplateId());

             if ( template == null ) {

                                 GlobalVariables.getMessageMap().addToErrorPath( MAINTAINABLE_ERROR_PATH );

                                 GlobalVariables.getMessageMap().putError( DETAIL_VALUES_PROPERTY, ERROR_MISSING_TEMPLATE, perm.getTemplateId() );

                                 GlobalVariables.getMessageMap().removeFromErrorPath( MAINTAINABLE_ERROR_PATH );

                                 rulesPassed = false;

                         } else {

                                 KimType kimType = KimApiServiceLocator.getKimTypeInfoService().getKimType(template.getKimTypeId());

                                 Map<String, String> details = perm.getDetails();

                                 // check that add passed attributes are defined

                                 for ( String attributeName : details.keySet() ) {

                                         if ( kimType.getAttributeDefinitionByName(attributeName) == null ) {

                                                 GlobalVariables.getMessageMap().addToErrorPath( MAINTAINABLE_ERROR_PATH );

                                                 GlobalVariables.getMessageMap().putError( DETAIL_VALUES_PROPERTY, ERROR_UNKNOWN_ATTRIBUTE, attributeName, template.getNamespaceCode(), template.getName() );

                                                 GlobalVariables.getMessageMap().removeFromErrorPath( MAINTAINABLE_ERROR_PATH );

                                                 rulesPassed = false;

                                         }

                                 }

                                 // if all attributes are known, pass to the service for validation

                                 if ( !GlobalVariables.getMessageMap().hasErrors() ) {

                                         PermissionTypeService service = getPermissionTypeService( kimType.getServiceName() );

                                         if ( service != null ) {

                                                 List<RemotableAttributeError> validationErrors = service.validateAttributes( kimType.getId(), details);

                                                 if ( validationErrors != null && !validationErrors.isEmpty() ) {

                                                         for ( RemotableAttributeError error : validationErrors ) {

                                                                 GlobalVariables.getMessageMap().addToErrorPath( MAINTAINABLE_ERROR_PATH );

                                                                 for (String errMsg : error.getErrors()) {

                                     GlobalVariables.getMessageMap().putError( DETAIL_VALUES_PROPERTY, ERROR_ATTRIBUTE_VALIDATION, error.getAttributeName(), errMsg );

                                 }

                                                                 GlobalVariables.getMessageMap().removeFromErrorPath( MAINTAINABLE_ERROR_PATH );

                                                         }

                                                         rulesPassed = false;

                                                 }

                                         }

                                 }

                         }

                         // check each permission name against the type

                 } catch ( RuntimeException ex ) {

                         LOG.error( "Error in processCustomRouteDocumentBusinessRules()", ex );

                         throw ex;

                 }

                 return rulesPassed;

         }

         protected boolean validateDetailValuesFormat(String permissionDetailValues){

                 if(permissionDetailValues != null){

                         String spacesPattern = "[\\s\\t]*";

                         Pattern pattern = Pattern.compile(".+"+"="+".+");

                         Matcher matcher;

                         // ensure that all line delimiters are single linefeeds

                         permissionDetailValues = permissionDetailValues.replace( "\r\n", "\n" );

                         permissionDetailValues = permissionDetailValues.replace( '\r', '\n' );

                         if(StringUtils.isNotBlank(permissionDetailValues)){

                                 String[] values = permissionDetailValues.split( "\n" );

                                 for(String attrib: values){

                                       matcher = pattern.matcher(attrib);

                                       if(!matcher.matches()){

                                               GlobalVariables.getMessageMap().putError(MAINTAINABLE_ERROR_PATH+"."+DETAIL_VALUES_PROPERTY, RiceKeyConstants.ERROR_INVALID_FORMAT, new String[]{"Detail Values", permissionDetailValues});

                                               return false;

                                       }

                                 }

                         }

                 }

                 return true;

         }

         protected PermissionTypeService getPermissionTypeService( String serviceName ) {

             if ( StringUtils.isBlank( serviceName ) ) {

                     return null;

             }

             try {

                     Object service = KIMServiceLocatorInternal.getService(serviceName);

                     // if we have a service name, it must exist

                     if ( service == null ) {

                                 LOG.warn("null returned for permission type service for service name: " + serviceName);

                     } else {

                             // whatever we retrieved must be of the correct type

                             if ( !(service instanceof PermissionTypeService)  ) {

                                     LOG.warn( "Service " + serviceName + " was not a KimPermissionTypeService.  Was: " + service.getClass().getName() );

                                     service = null;

                             }

                     }

                     return (PermissionTypeService)service;

             } catch( Exception ex ) {

                     LOG.error( "Error retrieving service: " + serviceName + " from the KimImplServiceLocator.", ex );

             }

             return null;

     }

 }