/**
    * Copyright 2005-2012 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.krms.impl.repository;
  
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Map.Entry;
  import java.util.Set;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.core.api.exception.RiceIllegalStateException;
  import org.kuali.rice.krad.service.BusinessObjectService;
  import org.kuali.rice.krad.service.KRADServiceLocator;
  import org.kuali.rice.krad.service.SequenceAccessorService;
  import org.kuali.rice.krms.api.repository.agenda.AgendaDefinition;
  import org.kuali.rice.krms.api.repository.agenda.AgendaItemDefinition;
  import org.kuali.rice.krms.api.repository.type.KrmsAttributeDefinition;
  import org.kuali.rice.krms.impl.util.KrmsImplConstants.PropertyNames;
  
  public final class AgendaBoServiceImpl implements AgendaBoService {
  
      // TODO: deal with active flag
  
      private BusinessObjectService businessObjectService;
      private KrmsAttributeDefinitionService attributeDefinitionService;
      private SequenceAccessorService sequenceAccessorService;
  
      /**
       * This overridden method creates a KRMS Agenda in the repository
       */
      @Override
      public AgendaDefinition createAgenda(AgendaDefinition agenda) {
          if (agenda == null){
              throw new IllegalArgumentException("agenda is null");
          }
          final String nameKey = agenda.getName();
          final String contextId = agenda.getContextId();
          final AgendaDefinition existing = getAgendaByNameAndContextId(nameKey, contextId);
          if (existing != null){
              throw new IllegalStateException("the agenda to create already exists: " + agenda);
          }
  
          AgendaBo agendaBo = from(agenda);
          businessObjectService.save(agendaBo);
          return to(agendaBo);
      }
  
      /**
       * This overridden method updates an existing Agenda in the repository
       */
      @Override
      public void updateAgenda(AgendaDefinition agenda) {
          if (agenda == null){
              throw new IllegalArgumentException("agenda is null");
          }
  
          // must already exist to be able to update
          final String agendaIdKey = agenda.getId();
          final AgendaBo existing = businessObjectService.findBySinglePrimaryKey(AgendaBo.class, agendaIdKey);
          if (existing == null) {
              throw new IllegalStateException("the agenda does not exist: " + agenda);
          }
          final AgendaDefinition toUpdate;
          if (existing.getId().equals(agenda.getId())) {
              toUpdate = agenda;
          } else {
              // if passed in id does not match existing id, correct it
              final AgendaDefinition.Builder builder = AgendaDefinition.Builder.create(agenda);
              builder.setId(existing.getId());
              toUpdate = builder.build();
          }
  
          // copy all updateable fields to bo
          AgendaBo boToUpdate = from(toUpdate);
  
          // delete any old, existing attributes
          Map<String,String> fields = new HashMap<String,String>(1);
          fields.put(PropertyNames.Agenda.AGENDA_ID, toUpdate.getId());
          businessObjectService.deleteMatching(AgendaAttributeBo.class, fields);
  
          // update new agenda and create new attributes
          businessObjectService.save(boToUpdate);
     }
 
     /**
      * This overridden method retrieves an Agenda from the repository
      */
     @Override
     public AgendaDefinition getAgendaByAgendaId(String agendaId) {
         if (StringUtils.isBlank(agendaId)){
             throw new IllegalArgumentException("agenda id is null");
         }
         AgendaBo bo = businessObjectService.findBySinglePrimaryKey(AgendaBo.class, agendaId);
         return to(bo);
     }
 
     /**
      * This overridden method retrieves an agenda from the repository
      */
     @Override
     public AgendaDefinition getAgendaByNameAndContextId(String name, String contextId) {
         if (StringUtils.isBlank(name)) {
             throw new IllegalArgumentException("name is blank");
         }
         if (StringUtils.isBlank(contextId)) {
             throw new IllegalArgumentException("contextId is blank");
         }
 
         final Map<String, Object> map = new HashMap<String, Object>();
         map.put("name", name);
         map.put("contextId", contextId);
 
         AgendaBo myAgenda = businessObjectService.findByPrimaryKey(AgendaBo.class, Collections.unmodifiableMap(map));
         return to(myAgenda);
     }
 
     /**
      * This overridden method retrieves a set of agendas from the repository
      */
     @Override
     public Set<AgendaDefinition> getAgendasByContextId(String contextId) {
         if (StringUtils.isBlank(contextId)){
             throw new IllegalArgumentException("context ID is null or blank");
         }
         final Map<String, Object> map = new HashMap<String, Object>();
         map.put("contextId", contextId);
         Set<AgendaBo> bos = (Set<AgendaBo>) businessObjectService.findMatching(AgendaBo.class, map);
         return convertListOfBosToImmutables(bos);
     }
 
     /**
      * This overridden method creates a new Agenda in the repository
      */
     @Override
     public AgendaItemDefinition createAgendaItem(AgendaItemDefinition agendaItem) {
         if (agendaItem == null){
             throw new IllegalArgumentException("agendaItem is null");
         }
         if (agendaItem.getId() != null){
             final AgendaDefinition existing = getAgendaByAgendaId(agendaItem.getId());
             if (existing != null){
                 throw new IllegalStateException("the agendaItem to create already exists: " + agendaItem);
             }
         }
 
         AgendaItemBo bo = AgendaItemBo.from(agendaItem);
         businessObjectService.save(bo);
         return AgendaItemBo.to(bo);
     }
 
     /**
      * This overridden method updates an existing Agenda in the repository
      */
     @Override
     public void updateAgendaItem(AgendaItemDefinition agendaItem) {
         if (agendaItem == null){
             throw new IllegalArgumentException("agendaItem is null");
         }
         final String agendaItemIdKey = agendaItem.getId();
         final AgendaItemDefinition existing = getAgendaItemById(agendaItemIdKey);
         if (existing == null) {
             throw new IllegalStateException("the agenda item does not exist: " + agendaItem);
         }
         final AgendaItemDefinition toUpdate;
         if (existing.getId().equals(agendaItem.getId())) {
             toUpdate = agendaItem;
         } else {
             final AgendaItemDefinition.Builder builder = AgendaItemDefinition.Builder.create(agendaItem);
             builder.setId(existing.getId());
             toUpdate = builder.build();
         }
 
         businessObjectService.save(AgendaItemBo.from(toUpdate));
     }
 
     /**
      * This overridden method adds a new AgendaItemDefinition to the repository
      */
     @Override
     public void addAgendaItem(AgendaItemDefinition agendaItem, String parentId, Boolean position) {
         if (agendaItem == null){
             throw new IllegalArgumentException("agendaItem is null");
         }
         AgendaItemDefinition parent = null;
         if (parentId != null){
             parent = getAgendaItemById(parentId);
             if (parent == null){
                 throw new IllegalStateException("parent agendaItem does not exist in repository. parentId = " + parentId);
             }
         }
         // create new AgendaItemDefinition
         final AgendaItemDefinition toCreate;
         if (agendaItem.getId() == null) {
             SequenceAccessorService sas = getSequenceAccessorService();
             final AgendaItemDefinition.Builder builder = AgendaItemDefinition.Builder.create(agendaItem);
             final String newId =sas.getNextAvailableSequenceNumber(
                     "KRMS_AGENDA_ITM_S", AgendaItemBo.class).toString();
             builder.setId(newId);
             toCreate = builder.build();
         } else {
             toCreate = agendaItem;
         }
         createAgendaItem(toCreate);
 
         // link it to it's parent (for whenTrue/whenFalse, sibling for always
         if (parentId != null) {
             final AgendaItemDefinition.Builder builder = AgendaItemDefinition.Builder.create(parent);
             if (position == null){
                 builder.setAlwaysId( toCreate.getId() );
             } else if (position.booleanValue()){
                 builder.setWhenTrueId( toCreate.getId() );
             } else if (!position.booleanValue()){
                 builder.setWhenFalseId( toCreate.getId() );
             }
             final AgendaItemDefinition parentToUpdate = builder.build();
             updateAgendaItem( parentToUpdate );
         }
     }
 
     /**
      * This overridden method retrieves an AgendaItemDefinition from the repository
      */
     @Override
     public AgendaItemDefinition getAgendaItemById(String id) {
         if (StringUtils.isBlank(id)){
             throw new IllegalArgumentException("agenda item id is null");
         }
         AgendaItemBo bo = businessObjectService.findBySinglePrimaryKey(AgendaItemBo.class, id);
         return AgendaItemBo.to(bo);
     }
 
     /**
      * Sets the businessObjectService attribute value.
      *
      * @param businessObjectService The businessObjectService to set.
      */
     public void setBusinessObjectService(final BusinessObjectService businessObjectService) {
         this.businessObjectService = businessObjectService;
     }
 
     protected BusinessObjectService getBusinessObjectService() {
         if ( businessObjectService == null ) {
             businessObjectService = KRADServiceLocator.getBusinessObjectService();
         }
         return businessObjectService;
     }
 
     /**
      * Sets the sequenceAccessorService attribute value.
      *
      * @param sequenceAccessorService The sequenceAccessorService to set.
      */
     public void setSequenceAccessorService(final SequenceAccessorService sequenceAccessorService) {
         this.sequenceAccessorService = sequenceAccessorService;
     }
 
     protected SequenceAccessorService getSequenceAccessorService() {
         if ( sequenceAccessorService == null ) {
             sequenceAccessorService = KRADServiceLocator.getSequenceAccessorService();
         }
         return sequenceAccessorService;
     }
 
     protected KrmsAttributeDefinitionService getAttributeDefinitionService() {
         if (attributeDefinitionService == null) {
             attributeDefinitionService = KrmsRepositoryServiceLocator.getKrmsAttributeDefinitionService();
         }
         return attributeDefinitionService;
     }
 
     public void setAttributeDefinitionService(KrmsAttributeDefinitionService attributeDefinitionService) {
         this.attributeDefinitionService = attributeDefinitionService;
     }
 
     /**
      * Converts a Set<AgendaBo> to an Unmodifiable Set<Agenda>
      *
      * @param agendaBos a mutable Set<AgendaBo> to made completely immutable.
      * @return An unmodifiable Set<Agenda>
      */
     public Set<AgendaDefinition> convertListOfBosToImmutables(final Collection<AgendaBo> agendaBos) {
         Set<AgendaDefinition> agendas = new HashSet<AgendaDefinition>();
         if (agendaBos != null){
             for (AgendaBo bo : agendaBos) {
                 AgendaDefinition agenda = to(bo);
                 agendas.add(agenda);
             }
         }
         return Collections.unmodifiableSet(agendas);
     }
 
     /**
      * Converts a mutable bo to it's immutable counterpart
      * @param bo the mutable business object
      * @return the immutable object
      */
     @Override
     public AgendaDefinition to(AgendaBo bo) {
         if (bo == null) { return null; }
         return org.kuali.rice.krms.api.repository.agenda.AgendaDefinition.Builder.create(bo).build();
     }
 
 
     /**
      * Converts a immutable object to it's mutable bo counterpart
      * @param im immutable object
      * @return the mutable bo
      */
     @Override
     public AgendaBo from(AgendaDefinition im) {
         if (im == null) { return null; }
 
         AgendaBo bo = new AgendaBo();
         bo.setId(im.getId());
         bo.setName( im.getName() );
         bo.setTypeId( im.getTypeId() );
         bo.setContextId( im.getContextId() );
         bo.setFirstItemId( im.getFirstItemId() );
         bo.setVersionNumber( im.getVersionNumber() );
         Set<AgendaAttributeBo> attributes = buildAgendaAttributeBo(im);
 
         bo.setAttributeBos(attributes);
 
         return bo;
     }
 
     private Set<AgendaAttributeBo> buildAgendaAttributeBo(AgendaDefinition im) {
         Set<AgendaAttributeBo> attributes = new HashSet<AgendaAttributeBo>();
 
         ContextBo context = getBusinessObjectService().findBySinglePrimaryKey(ContextBo.class, im.getContextId());
 
         // build a map from attribute name to definition
         Map<String, KrmsAttributeDefinition> attributeDefinitionMap = new HashMap<String, KrmsAttributeDefinition>();
 
         List<KrmsAttributeDefinition> attributeDefinitions =
                 getAttributeDefinitionService().findAttributeDefinitionsByType(im.getTypeId());
 
         for (KrmsAttributeDefinition attributeDefinition : attributeDefinitions) {
             attributeDefinitionMap.put(attributeDefinition.getName(), attributeDefinition);
         }
 
         // for each entry, build an AgendaAttributeBo and add it to the set
         for (Entry<String,String> entry  : im.getAttributes().entrySet()){
             KrmsAttributeDefinition attrDef = attributeDefinitionMap.get(entry.getKey());
 
             if (attrDef != null) {
                 AgendaAttributeBo attributeBo = new AgendaAttributeBo();
                 attributeBo.setAgendaId( im.getId() );
                 attributeBo.setAttributeDefinitionId(attrDef.getId());
                 attributeBo.setValue(entry.getValue());
                 attributeBo.setAttributeDefinition(KrmsAttributeDefinitionBo.from(attrDef));
                 attributes.add( attributeBo );
             } else {
                 throw new RiceIllegalStateException("there is no attribute definition with the name '" +
                         entry.getKey() + "' that is valid for the agenda type with id = '" + im.getTypeId() +"'");
             }
         }
         return attributes;
     }
 
 }