/**
    * 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.common.search.service.impl;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.log4j.Logger;
  import org.kuali.student.common.dao.SearchableDao;
  import org.kuali.student.common.exceptions.DoesNotExistException;
  import org.kuali.student.common.exceptions.InvalidParameterException;
  import org.kuali.student.common.exceptions.MissingParameterException;
  import org.kuali.student.common.exceptions.OperationFailedException;
  import org.kuali.student.common.search.dto.CrossSearchTypeInfo;
  import org.kuali.student.common.search.dto.SearchCriteriaTypeInfo;
  import org.kuali.student.common.search.dto.SearchRequest;
  import org.kuali.student.common.search.dto.SearchResult;
  import org.kuali.student.common.search.dto.SearchResultTypeInfo;
  import org.kuali.student.common.search.dto.SearchTypeInfo;
  import org.kuali.student.common.search.service.SearchManager;
  import org.springframework.context.ApplicationContext;
  import org.springframework.context.support.FileSystemXmlApplicationContext;
  
  /**
   * Loads all search info for a service into memory
   *
   */
  public class SearchManagerImpl implements SearchManager{
  
  	final Logger logger = Logger.getLogger(SearchManagerImpl.class);
  	
  	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();
  	}
  
  	public SearchCriteriaTypeInfo getSearchCriteriaType(
  			String searchCriteriaTypeKey) throws DoesNotExistException,
  			InvalidParameterException, MissingParameterException,
  			OperationFailedException {
  		return searchCriteriaTypeMap.get(searchCriteriaTypeKey);
  	}
  
  	public List<SearchCriteriaTypeInfo> getSearchCriteriaTypes()
  			throws OperationFailedException {
  		return new ArrayList<SearchCriteriaTypeInfo>(searchCriteriaTypeMap
  				.values());
  	}
  
  	public SearchResultTypeInfo getSearchResultType(String searchResultTypeKey)
  			throws DoesNotExistException, InvalidParameterException,
  			MissingParameterException, OperationFailedException {
  		return searchResultTypeInfoMap.get(searchResultTypeKey);
  	}
  
  	public List<SearchResultTypeInfo> getSearchResultTypes()
  			throws OperationFailedException {
  		return new ArrayList<SearchResultTypeInfo>(searchResultTypeInfoMap
  				.values());
  	}
  
  	public SearchTypeInfo getSearchType(String searchTypeKey)
  			throws DoesNotExistException, InvalidParameterException,
  			MissingParameterException, OperationFailedException {
  		return searchInfoTypeMap.get(searchTypeKey);
  	}
  
 	public List<SearchTypeInfo> getSearchTypes()
 			throws OperationFailedException {
 		return new ArrayList<SearchTypeInfo>(searchInfoTypeMap.values());
 	}
 
 	public List<SearchTypeInfo> getSearchTypesByCriteria(
 			String searchCriteriaTypeKey) throws DoesNotExistException,
 			InvalidParameterException, MissingParameterException,
 			OperationFailedException {
 		List<SearchTypeInfo> searchTypesByCriteria = new ArrayList<SearchTypeInfo>();
 		for (SearchTypeInfo searchTypeInfo : searchInfoTypeMap.values()) {
 			if (searchCriteriaTypeKey.equals(searchTypeInfo
 					.getSearchCriteriaTypeInfo().getKey())) {
 				searchTypesByCriteria.add(searchTypeInfo);
 			}
 		}
 		return searchTypesByCriteria;
 	}
 
 	public List<SearchTypeInfo> getSearchTypesByResult(
 			String searchResultTypeKey) throws DoesNotExistException,
 			InvalidParameterException, MissingParameterException,
 			OperationFailedException {
 		List<SearchTypeInfo> searchTypesByResult = new ArrayList<SearchTypeInfo>();
 		for (SearchTypeInfo searchTypeInfo : searchInfoTypeMap.values()) {
 			if (searchResultTypeKey.equals(searchTypeInfo
 					.getSearchResultTypeInfo().getKey())) {
 				searchTypesByResult.add(searchTypeInfo);
 			}
 		}
 		return searchTypesByResult;
 	}
 
 	public String getSearchContextFile() {
 		return searchContextFile;
 	}
 
 	public void setSearchContext(String searchContextFile) {
 		this.searchContextFile = searchContextFile;
 	}
 
 	@Override
 	public SearchResult search(SearchRequest searchRequest, SearchableDao dao) throws MissingParameterException {
 		if(searchRequest == null){
 			throw new MissingParameterException("Search Request can not be null.");
 		}
 		
 		String searchKey = searchRequest.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().dispatchSearch(searchRequest);
 			}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(searchRequest, (CrossSearchTypeInfo) searchType);
 		}
 		
 
 		try{
 			return dao.search(searchRequest, 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;
 	}
 
 }