/*

  * Copyright 2006-2011 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.kns.web.struts.action;

 import org.apache.commons.lang.StringUtils;

 import org.apache.struts.action.ActionForm;

 import org.apache.struts.action.ActionForward;

 import org.apache.struts.action.ActionMapping;

 import org.kuali.rice.core.api.config.property.ConfigContext;

 import org.kuali.rice.core.api.config.property.ConfigurationService;

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

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

 import org.kuali.rice.core.framework.parameter.ParameterService;

 import org.kuali.rice.core.framework.services.CoreFrameworkServiceLocator;

 import org.kuali.rice.kew.api.KewApiServiceLocator;

 import org.kuali.rice.kew.api.doctype.DocumentType;

 import org.kuali.rice.kns.datadictionary.BusinessObjectEntry;

 import org.kuali.rice.kns.datadictionary.DocumentEntry;

 import org.kuali.rice.kns.datadictionary.HeaderNavigation;

 import org.kuali.rice.kns.datadictionary.LookupDefinition;

 import org.kuali.rice.kns.datadictionary.MaintainableFieldDefinition;

 import org.kuali.rice.kns.service.KNSServiceLocator;

 import org.kuali.rice.kns.service.MaintenanceDocumentDictionaryService;

 import org.kuali.rice.kns.web.struts.form.KualiHelpForm;

 import org.kuali.rice.krad.datadictionary.AttributeDefinition;

 import org.kuali.rice.krad.datadictionary.DataDictionary;

 import org.kuali.rice.krad.datadictionary.DataDictionaryEntry;

 import org.kuali.rice.krad.datadictionary.HelpDefinition;

 import org.kuali.rice.krad.service.DataDictionaryService;

 import org.kuali.rice.krad.service.KRADServiceLocator;

 import org.kuali.rice.krad.service.KRADServiceLocatorWeb;

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

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 /**

  * This class handles requests for help text.

  * 

  * 

  */

 public class KualiHelpAction extends KualiAction {

     private static final org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(KualiHelpAction.class);

     private static final String VALIDATION_PATTERN_STRING = "ValidationPattern";

     private static final String NO = "No";

     private static final String YES = "Yes";

     static final String DEFAULT_LOOKUP_HELP_TEXT_RESOURCE_KEY = "lookupHelpText";

     private static DataDictionaryService dataDictionaryService;

     private static ConfigurationService kualiConfigurationService;

     private static ParameterService parameterService;

     private static MaintenanceDocumentDictionaryService maintenanceDocumentDictionaryService;

     private DataDictionaryService getDataDictionaryService() {

         if ( dataDictionaryService == null ) {

             dataDictionaryService = KRADServiceLocatorWeb.getDataDictionaryService();

         }

         return dataDictionaryService;

     }

     private ConfigurationService getConfigurationService() {

         if ( kualiConfigurationService == null ) {

             kualiConfigurationService = KRADServiceLocator.getKualiConfigurationService();

         }

         return kualiConfigurationService;

     }

     private ParameterService getParameterService() {

         if ( parameterService == null ) {

             parameterService = CoreFrameworkServiceLocator.getParameterService();

         }

         return parameterService;

     }

     private MaintenanceDocumentDictionaryService getMaintenanceDocumentDictionaryService() {

         if ( maintenanceDocumentDictionaryService == null ) {

             maintenanceDocumentDictionaryService = KNSServiceLocator.getMaintenanceDocumentDictionaryService();

         }

         return maintenanceDocumentDictionaryService;

     }

     /**

      * Convenience method for accessing <code>{@link DataDictionaryEntry}</code> for the given business object

      * 

      * @param businessObjectClassName

      * @return DataDictionaryEntry

      */

     private DataDictionaryEntry getDataDictionaryEntry(String businessObjectClassName) {

         return getDataDictionaryService().getDataDictionary().getDictionaryObjectEntry(businessObjectClassName);

     }

     /**

      * Convenience method for accessing the <code>{@link AttributeDefinition}</code> for a specific business object attribute

      * defined in the DataDictionary.

      * 

      * @param businessObjectClassName

      * @param attributeName

      * @return AttributeDefinition

      */

     private AttributeDefinition getAttributeDefinition(String businessObjectClassName, String attributeName) throws ClassNotFoundException {

         AttributeDefinition retval = null;

         if (getDataDictionaryEntry(businessObjectClassName) != null) {

             retval = getDataDictionaryEntry(businessObjectClassName).getAttributeDefinition(attributeName);

         }

         return retval;

     }

     /**

      * @param attribute <code>{@link AttributeDefinition}</code>

      * @return String

      */

     private String getAttributeMaxLength(AttributeDefinition attribute) throws Exception {

         return attribute.getMaxLength().toString();

     }

     /**

      * @param attribute <code>{@link AttributeDefinition}</code>

      * @return String

      */

     private String getAttributeValidationPatternName(AttributeDefinition attribute) throws Exception {

         String retval = new String();

         if (attribute.getValidationPattern() != null) {

             retval = attribute.getValidationPattern().getClass().getName();

         }

         if (retval.indexOf(".") > 0) {

             retval = retval.substring(retval.lastIndexOf(".") + 1);

         }

         if (retval.endsWith(VALIDATION_PATTERN_STRING)) {

             retval = retval.substring(0, retval.lastIndexOf(VALIDATION_PATTERN_STRING));

         }

         return retval;

     }

     /**

      * Retrieves help information from the data dictionary for the business object attribute.

      * 

      * @return ActionForward

      */

     public ActionForward getAttributeHelpText(ActionMapping mapping, KualiHelpForm helpForm, HttpServletRequest request, HttpServletResponse response) throws Exception {

         AttributeDefinition attribute;

         if (StringUtils.isBlank(helpForm.getBusinessObjectClassName()) || StringUtils.isBlank(helpForm.getAttributeName())) {

             throw new RuntimeException("Business object and attribute name not specified.");

         }

         attribute = getAttributeDefinition(helpForm.getBusinessObjectClassName(), helpForm.getAttributeName());

         if ( LOG.isDebugEnabled() ) {

             LOG.debug( "Request for help on: " + helpForm.getBusinessObjectClassName() + " -- " + helpForm.getAttributeName() );

             LOG.debug( "  attribute: " + attribute );

         }

         if (attribute == null || StringUtils.isBlank(attribute.getSummary())) {

             helpForm.setResourceKey(RiceKeyConstants.MESSAGE_NO_HELP_TEXT);

             return getResourceHelpText(mapping, helpForm, request, response);

         }

         boolean required = attribute.isRequired().booleanValue();

         // KULRNE-4392 - pull the required attribute on BO maintenance documents from the document def rather than the BO

         try {

             Class boClass = Class.forName( helpForm.getBusinessObjectClassName() );

             String docTypeName = getMaintenanceDocumentDictionaryService().getDocumentTypeName( boClass );

             if (StringUtils.isNotBlank(docTypeName)) {

                 // maybe it's not a maint doc

                 MaintainableFieldDefinition field = getMaintenanceDocumentDictionaryService().getMaintainableField( docTypeName, helpForm.getAttributeName() );

                 if ( field != null ) {

                     required = field.isRequired();

                 }

             }

             else {

                 if (log.isInfoEnabled()) {

                     log.info("BO class " + boClass.getName() + " does not have a maint doc definition.  Defaulting to using DD for definition");

                 }

             }

         } catch ( ClassNotFoundException ex ) {

             // do nothing

             LOG.warn( "Unable to obtain maintainable field for BO property.", ex );

         }

         helpForm.setHelpLabel(attribute.getLabel());

         helpForm.setHelpSummary(attribute.getSummary());

         helpForm.setHelpDescription(attribute.getDescription());

         helpForm.setHelpRequired(required?YES:NO);

         helpForm.setHelpMaxLength(getAttributeMaxLength(attribute));

         helpForm.setValidationPatternName(getAttributeValidationPatternName(attribute));

         return mapping.findForward(RiceConstants.MAPPING_BASIC);

     }

     /**

      * Retrieves help information from the data dictionary for the business object attribute.

      * 

      * @return ActionForward

      */

     public ActionForward getAttributeHelpText(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {

         return getAttributeHelpText(mapping, (KualiHelpForm) form, request, response);

     }

     /**

      * Retrieves help information from the data dictionary for the document type.

      */

     public ActionForward getDocumentHelpText(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {

         KualiHelpForm helpForm = (KualiHelpForm) form;

         String documentTypeName = helpForm.getDocumentTypeName();

         if (StringUtils.isBlank(documentTypeName)) {

             throw new RuntimeException("Document type name not specified.");

         }

         DataDictionary dataDictionary = getDataDictionaryService().getDataDictionary();

         DocumentEntry entry = (DocumentEntry) dataDictionary.getDocumentEntry(documentTypeName);

         String label = "";

         String summary = "";

         String description = "";

         HelpDefinition helpDefinition = null;

         String apcHelpUrl = null;

         if (entry != null) {

             DocumentType docType = KewApiServiceLocator.getDocumentTypeService().getDocumentTypeByName(entry.getDocumentTypeName());

             label = docType.getLabel();

             description = docType.getDescription();

             if (StringUtils.isNotBlank(docType.getHelpDefinitionUrl())) {

                     apcHelpUrl = ConfigContext.getCurrentContextConfig().getProperty("externalizable.help.url") + docType.getHelpDefinitionUrl();

             }

         }

         if ( StringUtils.isNotBlank(apcHelpUrl) ) {

             response.sendRedirect(apcHelpUrl);

             return null;

         }

         helpForm.setHelpLabel(label);

         helpForm.setHelpSummary(summary);

         helpForm.setHelpDescription(description);

         helpForm.setHelpDefinition(helpDefinition);

         return mapping.findForward(RiceConstants.MAPPING_BASIC);

     }

     /**

      * Retrieves help information from the data dictionary for the document type.

      */

     public ActionForward getBusinessObjectHelpText(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {

         KualiHelpForm helpForm = (KualiHelpForm) form;

         String objectClassName = helpForm.getBusinessObjectClassName();

         if (StringUtils.isBlank(objectClassName)) {

             throw new RuntimeException("Document type name not specified.");

         }

         DataDictionary dataDictionary = getDataDictionaryService().getDataDictionary();

         BusinessObjectEntry entry = (BusinessObjectEntry) dataDictionary.getBusinessObjectEntry(objectClassName);

         HelpDefinition helpDefinition = null;

         String apcHelpUrl = null;

         String label = "";

         String objectDescription = "";

         if (entry != null) {

             helpDefinition = entry.getHelpDefinition();

             label = entry.getObjectLabel();

             objectDescription = entry.getObjectDescription();

             if (null != helpDefinition && null != helpDefinition.getParameterNamespace() && null != helpDefinition.getParameterDetailType() && null != helpDefinition.getParameterName()) {

                 apcHelpUrl = getHelpUrl(helpDefinition.getParameterNamespace(), helpDefinition.getParameterDetailType(), helpDefinition.getParameterName());

                 }

                 }

         if ( !StringUtils.isBlank(apcHelpUrl) ) {

             response.sendRedirect(apcHelpUrl);

             return null;

         }

         helpForm.setHelpLabel(label);

         helpForm.setHelpDescription(objectDescription);

         return mapping.findForward(RiceConstants.MAPPING_BASIC);

     }

     /**

      * Retrieves help information from the data dictionary for the document type.

      */

     public ActionForward getPageHelpText(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {

         KualiHelpForm helpForm = (KualiHelpForm) form;

         String documentTypeName = helpForm.getDocumentTypeName();

         String pageName = helpForm.getPageName();

         if (StringUtils.isBlank(documentTypeName)) {

             throw new RuntimeException("Document type name not specified.");

         }

         if (StringUtils.isBlank(pageName)) {

             throw new RuntimeException("Page name not specified.");

         }

         DataDictionary dataDictionary = getDataDictionaryService().getDataDictionary();

         DocumentEntry entry = (DocumentEntry) dataDictionary.getDocumentEntry(documentTypeName);

         String apcHelpUrl = null;

         String label = "";

         String objectDescription = "";

         if (entry != null) {

             for ( HeaderNavigation headerNavigation : entry.getHeaderNavigationList() ) {

                 if (headerNavigation.getHeaderTabDisplayName().equals(pageName)) {

                     HelpDefinition helpDefinition = headerNavigation.getHelpDefinition();

                     if (null != helpDefinition && null != helpDefinition.getParameterNamespace() && null != helpDefinition.getParameterDetailType() && null != helpDefinition.getParameterName()) {

                         apcHelpUrl = getHelpUrl(helpDefinition.getParameterNamespace(), helpDefinition.getParameterDetailType(), helpDefinition.getParameterName());

                     }

                 }

             }

         }

         if ( !StringUtils.isBlank(apcHelpUrl) ) {

             response.sendRedirect(apcHelpUrl);

             return null;

         }

         helpForm.setHelpLabel(pageName);

         helpForm.setHelpDescription("No help content available.");

         return mapping.findForward(RiceConstants.MAPPING_BASIC);

     }

     /**

      * Retrieves help content to link to based on security group/parameter

      */

     public ActionForward getStoredHelpUrl(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {

         KualiHelpForm helpForm = (KualiHelpForm) form;

         String helpParameterNamespace = helpForm.getHelpParameterNamespace();

         String helpParameterDetailType = helpForm.getHelpParameterDetailType();

         String helpParameterName = helpForm.getHelpParameterName();

         if (StringUtils.isBlank(helpParameterNamespace)) {

             throw new RuntimeException("Parameter Namespace not specified.");

         }

         if (StringUtils.isBlank(helpParameterDetailType)) {

             throw new RuntimeException("Detail Type not specified.");

         }

         if (StringUtils.isBlank(helpParameterName)) {

             throw new RuntimeException("Parameter Name not specified.");

         }

         String apcHelpUrl = getHelpUrl(helpParameterNamespace, helpParameterDetailType, helpParameterName);

         if ( !StringUtils.isBlank(apcHelpUrl) ) {

             response.sendRedirect(apcHelpUrl);

             return null;

         }

         helpForm.setHelpDescription("No help content available.");

         return mapping.findForward(RiceConstants.MAPPING_BASIC);

     }

     /**

      * Retrieves help information from resources by key.

      */

     public ActionForward getResourceHelpText(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {

         KualiHelpForm helpForm = (KualiHelpForm) form;

         String resourceKey = helpForm.getResourceKey();

         populateHelpFormForResourceText(helpForm, resourceKey);

         return mapping.findForward(RiceConstants.MAPPING_BASIC);

     }

     /**

      * Utility method that populates a KualiHelpForm with the description from a given resource key

      * @param helpForm the KualiHelpForm to populate with help text

      * @param resourceKey the resource key to use as help text

      */

     protected void populateHelpFormForResourceText(KualiHelpForm helpForm, String resourceKey) {

             if (StringUtils.isBlank(resourceKey)) {

             throw new RuntimeException("Help resource key not specified.");

         }

         helpForm.setHelpLabel("");

         helpForm.setHelpSummary("");

         helpForm.setHelpDescription(getConfigurationService().getPropertyValueAsString(resourceKey));

     }

     /**

      * Retrieves help for a lookup

      */

     public ActionForward getLookupHelpText(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {

             KualiHelpForm helpForm = (KualiHelpForm) form;

             final String lookupBusinessObjectClassName = helpForm.getLookupBusinessObjectClassName();

         // TODO: fix once kew refactoring is complete

             if (!StringUtils.isBlank(lookupBusinessObjectClassName) && 

                     // don't do this for doc search

                     !"org.kuali.rice.kew.docsearch.DocSearchCriteriaDTO".equals(lookupBusinessObjectClassName)) {

                     final DataDictionary dataDictionary = getDataDictionaryService().getDataDictionary();

                     final BusinessObjectEntry entry = (BusinessObjectEntry) dataDictionary.getBusinessObjectEntry(lookupBusinessObjectClassName);

                     final LookupDefinition lookupDefinition = entry.getLookupDefinition();

                     if (lookupDefinition != null) {

                             if (lookupDefinition.getHelpDefinition() != null && !StringUtils.isBlank(lookupDefinition.getHelpDefinition().getParameterNamespace()) && !StringUtils.isBlank(lookupDefinition.getHelpDefinition().getParameterDetailType()) && !StringUtils.isBlank(lookupDefinition.getHelpDefinition().getParameterName())) {

                                     final String apcHelpUrl = getHelpUrl(lookupDefinition.getHelpDefinition().getParameterNamespace(), lookupDefinition.getHelpDefinition().getParameterDetailType(), lookupDefinition.getHelpDefinition().getParameterName());

                             if ( !StringUtils.isBlank(apcHelpUrl) ) {

                                 response.sendRedirect(apcHelpUrl);

                                 return null;

                             }

                             } else if (!StringUtils.isBlank(lookupDefinition.getHelpUrl())) {

                                     final String apcHelpUrl = ConfigContext.getCurrentContextConfig().getProperty("externalizable.help.url")+lookupDefinition.getHelpUrl();

                                     response.sendRedirect(apcHelpUrl);

                                     return null;

                             }

                     }

             }

             // handle doc search custom help urls

             if (!StringUtils.isEmpty(helpForm.getSearchDocumentTypeName())) {

                 DocumentType docType = KewApiServiceLocator.getDocumentTypeService().getDocumentTypeByName(helpForm.getSearchDocumentTypeName());

                 if (!StringUtils.isEmpty(docType.getDocSearchHelpUrl())) {

                     String docSearchHelpUrl = ConfigContext.getCurrentContextConfig().getProperty("externalizable.help.url") + docType.getDocSearchHelpUrl();

                     if ( StringUtils.isNotBlank(docSearchHelpUrl) ) {

                         response.sendRedirect(docSearchHelpUrl);

                         return null;

                     }

                 }

             }

             // still here?  guess we're defaulting...

             populateHelpFormForResourceText(helpForm, getDefaultLookupHelpResourceKey());

         return mapping.findForward(RiceConstants.MAPPING_BASIC);

     }

     /**

      * @return the key of the default lookup help resource text

      */

     protected String getDefaultLookupHelpResourceKey() {

             return KualiHelpAction.DEFAULT_LOOKUP_HELP_TEXT_RESOURCE_KEY;

     }

     private String getHelpUrl(String parameterNamespace, String parameterDetailTypeCode, String parameterName) {

         return getConfigurationService().getPropertyValueAsString(KRADConstants.EXTERNALIZABLE_HELP_URL_KEY) + getParameterService().getParameterValueAsString(parameterNamespace, parameterDetailTypeCode, parameterName);

     }    

     /**

      * Retrieves help content to link to based on parameterNamespace and parameterName

      */

     public ActionForward getHelpUrlByNamespace(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {

         KualiHelpForm helpForm = (KualiHelpForm) form;

        return getStoredHelpUrl(mapping, form, request, response); 

     }

 }