/**
    * Copyright 2010 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.osedu.org/licenses/ECL-2.0
    *
    * 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.student.r2.common.class1.search;
  
  import org.apache.log4j.Logger;
  import org.kuali.student.r2.common.dao.impl.SearchableCrudDaoImpl;
  import org.kuali.student.r2.common.dto.ContextInfo;
  import org.kuali.student.r2.common.dto.RichTextInfo;
  import org.kuali.student.r2.common.exceptions.DoesNotExistException;
  import org.kuali.student.r2.common.exceptions.InvalidParameterException;
  import org.kuali.student.r2.common.exceptions.MissingParameterException;
  import org.kuali.student.r2.common.exceptions.OperationFailedException;
  import org.kuali.student.r2.common.exceptions.PermissionDeniedException;
  import org.kuali.student.r2.core.class1.type.dto.TypeInfo;
  import org.kuali.student.r2.core.search.dto.CrossSearchTypeInfo;
  import org.kuali.student.r2.core.search.dto.SearchCriteriaTypeInfo;
  import org.kuali.student.r2.core.search.dto.SearchRequestInfo;
  import org.kuali.student.r2.core.search.dto.SearchResultInfo;
  import org.kuali.student.r2.core.search.dto.SearchResultTypeInfo;
  import org.kuali.student.r2.core.search.dto.SearchTypeInfo;
  import org.kuali.student.r2.core.search.service.SearchManager;
  import org.springframework.context.ApplicationContext;
  import org.springframework.context.support.FileSystemXmlApplicationContext;
  
  import javax.jws.WebParam;
  import javax.persistence.EntityManager;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  
  /**
   * Loads all search info for a service into memory
   *
   */
  public class SearchManagerImpl implements SearchManager {
  
  	final Logger logger = Logger.getLogger(SearchManagerImpl.class);
  
      private SearchableCrudDaoImpl dao;
  
  	private String searchContextFile;
  	private Map<String, SearchTypeInfo> searchInfoTypeMap;
  	private Map<String, SearchCriteriaTypeInfo> searchCriteriaTypeMap;
  	private Map<String, SearchResultTypeInfo> searchResultTypeInfoMap;
  	private Map<String, String> queryMap;
  
  	private CrossSearchManager crossSearchManager;
  
  	@SuppressWarnings("unchecked")
  	private void init() {
  		ApplicationContext ac = new FileSystemXmlApplicationContext(searchContextFile);
  		searchInfoTypeMap = ac.getBeansOfType(SearchTypeInfo.class);
  		searchCriteriaTypeMap = ac.getBeansOfType(SearchCriteriaTypeInfo.class);
  		searchResultTypeInfoMap = ac.getBeansOfType(SearchResultTypeInfo.class);
  		queryMap = (Map<String, String>) ac.getBean("queryMap");
  	}
  
  	public SearchManagerImpl(String searchContextFile) {
  		super();
  		this.searchContextFile = searchContextFile;
  		init();
  	}
  
      /**
       * This Constructor should only be used in tests.
       * @param searchContextFile
       * @param em
       */
      public SearchManagerImpl(String searchContextFile, EntityManager em) {
          this(searchContextFile);
          dao = new SearchableCrudDaoImpl();
          dao.setEm(em);
      }
  
      @Override
      public TypeInfo getSearchType(String searchTypeKey,  ContextInfo contextInfo) throws DoesNotExistException, InvalidParameterException, MissingParameterException, OperationFailedException {
  		return toTypeInfo(searchInfoTypeMap.get(searchTypeKey));
  	}
  
      @Override
      public List<TypeInfo> getSearchTypes( ContextInfo contextInfo) throws InvalidParameterException, MissingParameterException, OperationFailedException {
          List<TypeInfo> typeInfos = new ArrayList<TypeInfo>();
          for(SearchTypeInfo searchTypeInfo : searchInfoTypeMap.values()){
              typeInfos.add(toTypeInfo(searchTypeInfo));
          }
          return typeInfos;
 	}
 
     private TypeInfo toTypeInfo(SearchTypeInfo searchTypeInfo){
 
         if (searchTypeInfo == null){
             return null;
         }
 
         TypeInfo typeInfo = new TypeInfo();
         typeInfo.setKey(searchTypeInfo.getKey());
         typeInfo.setName(searchTypeInfo.getName());
         RichTextInfo textInfo = new RichTextInfo();
         textInfo.setPlain(searchTypeInfo.getDesc());
         textInfo.setFormatted(searchTypeInfo.getDesc());
         typeInfo.setDescr(textInfo);
         return typeInfo;
     }
 
 	public String getSearchContextFile() {
 		return searchContextFile;
 	}
 
 	public void setSearchContext(String searchContextFile) {
 		this.searchContextFile = searchContextFile;
 	}
 
 	@Override
     public SearchResultInfo search(SearchRequestInfo searchRequestInfo, @WebParam(name = "contextInfo") ContextInfo contextInfo) throws MissingParameterException, OperationFailedException, PermissionDeniedException, InvalidParameterException {
     	if(searchRequestInfo == null){
 			throw new MissingParameterException("Search Request can not be null.");
 		}
 
 		String searchKey = searchRequestInfo.getSearchKey();
 
 		SearchTypeInfo searchType = searchInfoTypeMap.get(searchKey);
 
 		//If no type was found for the key, try to dispatch the search
 		if(searchType == null){
 			if(crossSearchManager!=null && crossSearchManager.getSearchDispatcher()!=null){
 				logger.info("Search type '"+searchKey+"' is not known to this service's search manager, attempting to dispatch search.");
 				return crossSearchManager.getSearchDispatcher().search(searchRequestInfo, contextInfo);
 			}else{
 				logger.error("Search type '"+searchKey+"' is not known to this service's search manager.");
 				throw new RuntimeException("Search type '"+searchKey+"' is not known to this service's search manager.");
 			}
 		}
 
 		//Check if the search is a cross search
 		if(searchType instanceof CrossSearchTypeInfo){
 			if(crossSearchManager == null){
 				//FIXME should we change these to Operation Failed Exceptions? also we need to handle invalid parameters.
 				throw new RuntimeException("Requested cross service search:"+searchKey+", but no cross service search manager was defined.");
 			}
 			return crossSearchManager.doCrossSearch(searchRequestInfo, (CrossSearchTypeInfo) searchType, contextInfo);
 		}
 
 
 		try{
 			return dao.search(searchRequestInfo, queryMap, searchType);
 		}catch (Exception e){
 			logger.error("Search Failed for searchKey:"+searchKey,e);
 			throw new RuntimeException("Search Failed for searchKey:"+searchKey, e);
 		}
 	}
 
 	public void setCrossSearchManager(CrossSearchManager crossSearchManager) {
 		this.crossSearchManager = crossSearchManager;
 	}
 
     public SearchableCrudDaoImpl getDao() {
         return dao;
     }
 
     public void setDao(SearchableCrudDaoImpl dao) {
         this.dao = dao;
     }
 }