/*

  * 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.kew.rule.service.impl;

 import org.apache.commons.lang.StringUtils;

 import org.jdom.Element;

 import org.kuali.rice.core.api.impex.ExportDataSet;

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

 import org.kuali.rice.kew.exception.WorkflowServiceErrorException;

 import org.kuali.rice.kew.exception.WorkflowServiceErrorImpl;

 import org.kuali.rice.kew.rule.RuleDelegation;

 import org.kuali.rice.kew.rule.bo.RuleTemplate;

 import org.kuali.rice.kew.rule.dao.RuleDelegationDAO;

 import org.kuali.rice.kew.rule.service.RuleDelegationService;

 import org.kuali.rice.kew.rule.service.RuleTemplateService;

 import org.kuali.rice.kew.service.KEWServiceLocator;

 import org.kuali.rice.kew.util.KEWConstants;

 import org.kuali.rice.kew.util.PerformanceLogger;

 import org.kuali.rice.kew.xml.RuleXmlParser;

 import org.kuali.rice.kew.xml.export.RuleDelegationXmlExporter;

 import org.kuali.rice.kim.api.group.Group;

 import org.kuali.rice.kim.api.group.GroupService;

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

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

 import org.kuali.rice.ksb.api.KsbApiServiceLocator;

 import java.io.InputStream;

 import java.util.ArrayList;

 import java.util.Collection;

 import java.util.Collections;

 import java.util.List;

 import java.util.Map;

 /**

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

  */

 public class RuleDelegationServiceImpl implements RuleDelegationService {

     private static final String USING_RULE_DLGN_CACHE_IND = "CACHING_IND";

     private static final String RULE_DLGN_GROUP_CACHE = "org.kuali.rice.kew.rule.RuleDlgnCache";

         private static final org.apache.log4j.Logger LOG = org.apache.log4j.Logger

                         .getLogger(RuleDelegationServiceImpl.class);

         private static final String XML_PARSE_ERROR = "general.error.parsexml";

     private RuleDelegationDAO dao;

     public List<RuleDelegation> findByDelegateRuleId(String ruleId) {

         if (ruleId == null) return Collections.EMPTY_LIST;

         return dao.findByDelegateRuleId(ruleId);

     }

     public void save(RuleDelegation ruleDelegation) {

         dao.save(ruleDelegation);

     }

     public void setRuleDelegationDAO(RuleDelegationDAO dao) {

         this.dao = dao;

     }

     public List<RuleDelegation> findAllCurrentRuleDelegations(){

         return dao.findAllCurrentRuleDelegations();

     }

     public void delete(String ruleDelegationId){

         dao.delete(ruleDelegationId);

     }

     public RuleDelegation findByRuleDelegationId(String ruleDelegationId){

         return dao.findByRuleDelegationId(ruleDelegationId);

     }

     public List<RuleDelegation> findByResponsibilityId(String responsibilityId) {

             //return dao.findByResponsibilityIdWithCurrentRule(responsibilityId);

             return findByResponsibilityId(responsibilityId, false);

     }

     public List<RuleDelegation> search(String parentRuleBaseVaueId, String parentResponsibilityId,  String docTypeName, String ruleId, String ruleTemplateId, String ruleDescription, String groupId, String principalId,

             String delegationType, Boolean activeInd, Map extensionValues, String workflowIdDirective) {

         return dao.search(parentRuleBaseVaueId, parentResponsibilityId, docTypeName, ruleId, ruleTemplateId, ruleDescription, groupId, principalId, delegationType,

                 activeInd, extensionValues, workflowIdDirective);

     }

     public List<RuleDelegation> searchByTemplate(String parentRuleBaseVaueId, String parentResponsibilityId,  String docTypeName, String ruleTemplateName, String ruleDescription, String groupId, String principalId,

             Boolean workgroupMember, String delegationType, Boolean activeInd, Map extensionValues, Collection<String> actionRequestCodes) {

         if ( (StringUtils.isEmpty(docTypeName)) &&

                 (StringUtils.isEmpty(ruleTemplateName)) &&

                 (StringUtils.isEmpty(ruleDescription)) &&

                 (StringUtils.isEmpty(groupId)) &&

                 (StringUtils.isEmpty(principalId)) &&

                 (extensionValues.isEmpty()) &&

                 (actionRequestCodes.isEmpty()) ) {

             // all fields are empty

             throw new IllegalArgumentException("At least one criterion must be sent");

         }

         RuleTemplate ruleTemplate = getRuleTemplateService().findByRuleTemplateName(ruleTemplateName);

         String ruleTemplateId = null;

         if (ruleTemplate != null) {

             ruleTemplateId = ruleTemplate.getRuleTemplateId();

         }

         if ( ( (extensionValues != null) && (!extensionValues.isEmpty()) ) &&

                 (ruleTemplateId == null) ) {

             // cannot have extensions without a correct template

             throw new IllegalArgumentException("A Rule Template Name must be given if using Rule Extension values");

         }

         Collection<String> workgroupIds = new ArrayList<String>();

         if (principalId != null) {

             if ( (workgroupMember == null) || (workgroupMember.booleanValue()) ) {

                 workgroupIds = getGroupService().getGroupIdsForPrincipal(principalId);

             } else {

                 // user was passed but workgroups should not be parsed... do nothing

             }

         } else if (groupId != null) {

             Group group = KEWServiceLocator.getIdentityHelperService().getGroup(groupId);

             if (group == null) {

                 throw new IllegalArgumentException("Group does not exist in for given group id: " + groupId);

             } else  {

                 workgroupIds.add(group.getId());

             }

         }

         return dao.search(parentRuleBaseVaueId, parentResponsibilityId, docTypeName, ruleTemplateId, ruleDescription, workgroupIds, principalId,

                 delegationType,activeInd, extensionValues, actionRequestCodes);

     }

     public void loadXml(InputStream inputStream, String principalId) {

             RuleXmlParser parser = new RuleXmlParser();

         try {

             parser.parseRuleDelegations(inputStream);

         } catch (Exception e) { //any other exception

             LOG.error("Error loading xml file", e);

             WorkflowServiceErrorException wsee = new WorkflowServiceErrorException("Error loading xml file", new WorkflowServiceErrorImpl("Error loading xml file", XML_PARSE_ERROR));

             wsee.initCause(e);

             throw wsee;

         }

         }

         public Element export(ExportDataSet dataSet) {

                 RuleDelegationXmlExporter exporter = new RuleDelegationXmlExporter();

                 return exporter.export(dataSet);

         }

         @Override

         public boolean supportPrettyPrint() {

                 return true;

         }

         private GroupService getGroupService() {

         return KimApiServiceLocator.getGroupService();

     }

     private RuleTemplateService getRuleTemplateService() {

         return KEWServiceLocator.getRuleTemplateService();

     }

     public List findByResponsibilityId(String responsibilityId, boolean ignoreCache) {

             if ( responsibilityId != null ) {

                     PerformanceLogger performanceLogger = new PerformanceLogger();

                     Boolean cachingRules = CoreFrameworkServiceLocator.getParameterService().getParameterValueAsBoolean(KEWConstants.KEW_NAMESPACE, KRADConstants.DetailTypes.RULE_DETAIL_TYPE, USING_RULE_DLGN_CACHE_IND);

                     if (cachingRules.booleanValue()) {

                             List<RuleDelegation> rules = getListFromCache(responsibilityId);

                             if (rules != null && !ignoreCache) {

                                     performanceLogger.log("Time to fetchDelegationRules by responsibility Id " + responsibilityId + " cached.");

                                     return rules;

                             }

                             rules = dao.findByResponsibilityIdWithCurrentRule(responsibilityId);

                             putListInCache(responsibilityId, rules);

                             performanceLogger.log("Time to fetchDlgnRules by responsibilityId " + responsibilityId + " cache refreshed.");

                             return rules;

                     } else {

                             performanceLogger.log("Time to fetchDelegationRules by responsibility Id " + responsibilityId + " not caching.");

                             return dao.findByResponsibilityIdWithCurrentRule(responsibilityId);

                     }

             } else {

                     return dao.findByResponsibilityIdWithCurrentRule(responsibilityId);

             }

     }

     protected void putListInCache(String responsibilityId, List<RuleDelegation> rules) {

             String responsibilityIdStr = responsibilityId.toString();

         LOG.info("Caching " + rules.size() + " rules for responsibilityId=" + responsibilityIdStr );

         KsbApiServiceLocator.getCacheAdministrator().putInCache(getRuleDlgnCacheKey(responsibilityIdStr), rules, RULE_DLGN_GROUP_CACHE);

     }

     protected List<RuleDelegation> getListFromCache(String responsibilityId) {

             String responsibilityIdStr = responsibilityId.toString();

         LOG.debug("Retrieving List of Delegation Rules from cache for responsibilityId = " + responsibilityIdStr );

         return (List) KsbApiServiceLocator.getCacheAdministrator().getFromCache(getRuleDlgnCacheKey(responsibilityIdStr));

     }

     protected String getRuleDlgnCacheKey(String responsibilityIdStr) {

         return "RuleDlgnCache:" + responsibilityIdStr;

     }

     public void flushRuleDlgnCache() {

         LOG.info("Flushing entire Rule Delegation Cache.");

         KsbApiServiceLocator.getCacheAdministrator().flushGroup(RULE_DLGN_GROUP_CACHE);

     }

 }