/*
 *    GS2SolrSearch.java
 *    Copyright (C) 2006 New Zealand Digital Library, http://www.nzdl.org
 *
 *    This program is free software; you can redistribute it and/or modify
 *   the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

package org.greenstone.gsdl3.service;

import java.io.File;
import java.io.IOException;
// Greenstone classes
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import java.util.Vector;
import java.util.concurrent.TimeUnit;

import org.apache.log4j.Logger;
import org.apache.solr.client.solrj.SolrClient;
//import org.apache.solr.client.solrj.SolrServerException;
//import org.apache.solr.client.solrj.impl.HttpJdkSolrClient;
//import org.apache.solr.client.solrj.impl.HttpSolrClient.RemoteSolrException;
//import org.apache.solr.client.solrj.request.CoreAdminRequest;
//import org.apache.solr.client.solrj.request.CoreStatus;
//import org.apache.solr.client.solrj.response.CoreAdminResponse;
import org.apache.solr.client.solrj.response.FacetField;
//import org.apache.solr.common.params.CoreAdminParams.CoreAdminAction;
import org.apache.solr.common.util.NamedList;
import org.greenstone.LuceneWrapper4.SharedSoleneQueryResult;
import org.greenstone.gsdl3.util.FacetWrapper;
import org.greenstone.gsdl3.util.GSFile;
import org.greenstone.gsdl3.util.GSXML;
import org.greenstone.gsdl3.util.SolrCoreManager;
import org.greenstone.gsdl3.util.SolrFacetWrapper;
import org.greenstone.gsdl3.util.SolrQueryResult;
import org.greenstone.gsdl3.util.SolrQueryWrapper;
import org.greenstone.util.GlobalProperties;
import org.greenstone.util.ProtocolPortProperties;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

//import org.apache.solr.client.solrj.impl.HttpSolrServer.RemoteSolrException;
//import org.apache.solr.client.solrj.request.CoreAdminRequest;
//import org.apache.solr.client.solrj.response.CoreAdminResponse;
//import org.apache.solr.common.params.CoreAdminParams.CoreAdminAction;
//import org.apache.solr.common.util.NamedList;

public class GS2SolrSearch extends SharedSoleneGS2FieldSearch
{

  protected static final String SORT_ORDER_PARAM = "sortOrder";
  protected static final String SORT_ORDER_DESCENDING = "1";
  protected static final String SORT_ORDER_ASCENDING = "0";

    protected static final String FACET_QUERIES_PARAM = "facetQueries";
    protected static final String DOC_FILTER_PARAM = "docFilter";
    
	static Logger logger = Logger.getLogger(org.greenstone.gsdl3.service.GS2SolrSearch.class.getName());

  //protected String solr_server_base_url;
  //protected HashMap<String, SolrClient> solr_client_core_cache;
  //protected SolrQueryWrapper solr_src = null;
  protected SolrCoreManager core_manager = null;
  protected ArrayList<String> _facets = new ArrayList<String>();

  protected HashMap<String, Element> _facet_display_names = new HashMap<String, Element>();
  protected ArrayList<String> _corenames = new ArrayList<String>();

  //protected String solr_core_location = null;
	public GS2SolrSearch()
	{
                this.paramDefaults.put(SORT_ORDER_PARAM, SORT_ORDER_DESCENDING);
		this.does_faceting = true;
		this.does_highlight_snippets = true;
		this.does_full_field_highlighting = true;
		// Used to store the solr cores that match the required 'level' 
		// of search (e.g. either document-level=>didx, or 
		// section-level=>sidx.  The hashmap is filled out on demand
		// based on 'level' parameter passed in to 'setUpQueryer()'

                this.core_manager = new SolrCoreManager();
//                core_manager.initialise();
		//this.solr_client_core_cache = new HashMap<String, SolrClient>();

		//solr_src = new SolrQueryWrapper();		

                // String solr_host = System.getenv("SOLR_HOST");
                // if (solr_host == null) {
                //   logger.warn("SOLR_HOST env var is null, defaulting to 127.0.0.1");
                //   solr_host = "127.0.0.1";
                // }
                // String solr_port = System.getenv("SOLR_PORT");
                // if (solr_port == null) {
                //   logger.warn("SOLR_PORT env var is null, defaulting to 7983");
                //   solr_port = "7983";
                // }
                // this.solr_server_base_url = "http://"+solr_host+":"+ solr_port +"/solr";
                // this.solr_core_location = GlobalProperties.getGSDL3DataHome()+File.separator+"ext"+File.separator + "solr9"+File.separator+"cores"+File.separator;
	}

	/** configure this service */
	public boolean configure(Element info, Element extra_info)
	{
		boolean success = super.configure(info, extra_info);

                // don't really want to do this each configure, but we can't do it in the constructor
                core_manager.initialise(this.router.getSiteName(), this.cluster_name);
		// clear the map of any previous solr cores for this collection added to the map upon querying
		core_manager.cleanUp();
                //cleanUpSolrCores();
		    
		if(!success) {
		    return false;
		}
		
	       
		// set up which params to save
		this.save_params.add(LEVEL_PARAM);

		// Setting up facets

		// the search element from collectionConfig
		Element searchElem = (Element) GSXML.getChildByTagName(extra_info, GSXML.SEARCH_ELEM);

		Document owner = info.getOwnerDocument();
		// for each facet in buildConfig
		NodeList facet_list = info.getElementsByTagName("facet");
		for (int i=0; i<facet_list.getLength(); i++) {
		  Element facet = (Element)facet_list.item(i);
		  String shortname = facet.getAttribute(GSXML.SHORTNAME_ATT);
		  _facets.add(shortname);

		  // now add any displayItems into the facet element
		  // (which is stored as part of info), then we can add to
		  // the result if needed
		  String longname = facet.getAttribute(GSXML.NAME_ATT);
		  Element config_facet = GSXML.getNamedElement(searchElem, "facet", GSXML.NAME_ATT, longname);
		  if (config_facet != null) {
		    NodeList display_items = config_facet.getElementsByTagName(GSXML.DISPLAY_TEXT_ELEM);
		    for (int j=0; j<display_items.getLength(); j++) {
		      Element e = (Element) display_items.item(j);
		      facet.appendChild(owner.importNode(e, true));
		    }
		    _facet_display_names.put(shortname, facet);

		  }
		      
		}
		NodeList core_list = info.getElementsByTagName("solrcore");
		if (core_list.getLength()>0) {
		    for (int i=0; i<core_list.getLength(); i++) {
			Element core = (Element)core_list.item(i);
			String corename = core.getAttribute(GSXML.NAME_ATT);
			_corenames.add(corename);
		    }
		} else {
                  logger.error("buildConfig.xml has no solrcores listed!");
                  return false;
/*		    // old style coll, desn't have solrcores listed in buildConfig
		    // check levels, and use didx and sidx depending on which
		    // levels are specified
		    for (int i=0; i<level_ids.size(); i++) {
			String level = level_ids.get(i);
			if (level.toUpperCase().equals("SEC")) {
			    _corenames.add("sidx");
			} else if (level.toUpperCase().equals("DOC")){
			    _corenames.add("didx");
			}
                        }*/
		}

		// check if cores loaded
		// if (!loadSolrCores()) {
		// 	logger.error("Collection: couldn't configure collection: " + this.cluster_name + ", "
		// 			+ "Couldn't activate Solr cores");
		// 	 return false;
		// }
		// return true;

                // why should we have to load a core here?? lets try just checking them
                core_manager.setCorenames(_corenames);
                // if (!checkSolrCores()) {
                //   return false;
                // }
                if (!core_manager.checkSolrCores()) {
                  return false;
                }
                return true;
        }

  // private boolean checkSolrCoresUNUSED() {

  //     boolean all_ok = true;
  //     SolrClient solrClient = null;
      
  //     try {
  //         solrClient = new HttpJdkSolrClient.Builder(this.solr_server_base_url)
  //             .withConnectionTimeout(3, TimeUnit.SECONDS)
  //             .build();

  //         CoreAdminRequest adminRequest = new CoreAdminRequest();
  //         for (int i=0; i<_corenames.size(); i++) {
  //             String this_core = getCollectionCoreNamePrefix()+"-"+_corenames.get(i);
	      
  //             try {
  //       	  CoreStatus rsp = adminRequest.getCoreStatus(this_core, solrClient);
  //       	  logger.info("Core "+ this_core+" exists, status: " + rsp.toString());
  //             }
  //             catch (SolrServerException e) {
  //       	  logger.warn("Solr core " + this_core + " for collection " + cluster_name + " does not exist: " + e.getMessage());
		  
  //       	  all_ok = false;
  //             }
  //             catch (IOException e) {
  //       	  logger.warn("Solr core " + this_core + " for collection " + cluster_name + " does not exist: " + e.getMessage());
		  
  //       	  all_ok = false;	
  //             }
  //             catch (Exception e) {
  //       	  logger.warn("Solr core " + this_core + " for collection " + cluster_name + " does not appear to have been built");
  //       	  all_ok = false;
  //             }      
  //         }
  //     }
  //     catch (Exception e) {
  //         logger.error("Failed to create/use SolrClient", e);
  //     }
  //     finally {
  //         if (solrClient != null) {
  //             try {
  //       	  solrClient.close();
  //             }
  //             catch (Exception e) {
  //       	  logger.error("Failed to close SolrClient", e);
  //             }
  //         }
  //     }

  //     // if we get here, all cores are active
  //     return all_ok;
  // }
                  
                
  //   public void cleanUpSolrCoresUNUSED()
  //   {

  //       if (solr_client_core_cache == null) {
  //           return;
  //       }
	
  //       for (Map.Entry<String, SolrClient> entry : solr_client_core_cache.entrySet()) {
  //           String coreName = entry.getKey();
  //           SolrClient client = entry.getValue();

  //           if (client != null) {
  //       	try {
  //       	    client.close();
  //       	    logger.info("Closed SolrClient for core: " + coreName);
  //       	}
  //       	catch (Exception e) {
  //       	    logger.error("Failed to close SolrClient for core: " + coreName, e);
  //       	}
  //           }
  //       }
	
  //       solr_client_core_cache.clear();	
  //   }
    
	public void cleanUp()
	{
		super.cleanUp();
		//this.solr_src.cleanUp();

		// clear the map keeping track of the SolrClients in this collection
		core_manager.cleanUp();
                  //cleanUpSolrCores();
	}

	/** add in the SOLR specific params to TextQuery */
  protected void addQueryParams(String service_id, Element param_list, String lang)
	{
          /** Add in the sort order asc/desc param */
          createParameter(SORT_ORDER_PARAM, param_list, lang);
          super.addQueryParams(service_id, param_list, lang);
		
		
	}

  /** create a param and add to the list */
  protected void createParameter(String name, Element param_list, String lang)
  {
    Document doc = param_list.getOwnerDocument();
    Element param = null;
    String param_default = paramDefaults.get(name);
    if (name.equals(SORT_ORDER_PARAM)) {
        String[] vals = { SORT_ORDER_ASCENDING, SORT_ORDER_DESCENDING }; 
	String[] vals_texts = { getTextString("param." + SORT_ORDER_PARAM + "." + SORT_ORDER_ASCENDING, lang), getTextString("param." + SORT_ORDER_PARAM + "." + SORT_ORDER_DESCENDING, lang) }; 	    
	
	param = GSXML.createParameterDescription(doc, SORT_ORDER_PARAM, getTextString("param." + SORT_ORDER_PARAM, lang), GSXML.PARAM_TYPE_ENUM_SINGLE, param_default, vals, vals_texts);
    }

    if (param != null)
      {
	param_list.appendChild(param);
      }
    else
      {
	super.createParameter(name, param_list, lang);
      }
    
  }
  
	/** methods to handle actually doing the query */

	/** do any initialisation of the query object */
  protected Object setUpQueryer(HashMap params, String service_name)
	{
          SolrQueryWrapper solr_src = new SolrQueryWrapper();
          //	solr_src.clearFacets();
          //	solr_src.clearFacetQueries();

		for (int i = 0; i < _facets.size(); i++)
		{
			solr_src.addFacet(_facets.get(i));
		}

                // set up default core in case we get no level param
		String index = "didx";
		if (this.default_level.toUpperCase().equals("SEC")) {
		  index = "sidx";
		}

                // copied from AbstractGS2FieldSearch, so we don't need a member variable
                String field = (String) params.get(INDEX_PARAM);
		if (field == null)
		{
                  field = default_index;
		}
                
		String physical_index_language_name = null;
		String physical_sub_index_name = null;
		String docFilter = null;
		int maxdocs = 100;
		int hits_per_page = 20;
		int start_page = 1;
		// set up the query params
		Set entries = params.entrySet();
		Iterator i = entries.iterator();
		while (i.hasNext())
		{
			Map.Entry m = (Map.Entry) i.next();
			String name = (String) m.getKey();
			String value = (String) m.getValue();

			///System.err.println("### GS2SolrSearch.java: name " + name + " - value " + value);

			if (name.equals(MAXDOCS_PARAM) && !value.equals(""))
			{
				maxdocs = Integer.parseInt(value);
			}
			else if (name.equals(HITS_PER_PAGE_PARAM))
			{
				hits_per_page = Integer.parseInt(value);
			}
			else if (name.equals(START_PAGE_PARAM))
			{
				start_page = Integer.parseInt(value);
			}
			else if (name.equals(MATCH_PARAM))
			{
				if (value.equals(MATCH_PARAM_ALL))
				{
					solr_src.setDefaultConjunctionOperator("AND");
				}
				else
				{
					solr_src.setDefaultConjunctionOperator("OR");
				}
			}
			else if (name.equals(RANK_PARAM))
			{
				if (value.equals(RANK_PARAM_RANK))
				{
				  value = SolrQueryWrapper.SORT_BY_RANK;
				} else if (value.equals(RANK_PARAM_NONE)) {
				    value = SolrQueryWrapper.SORT_BY_INDEX_ORDER;
				  }
		       
				solr_src.setSortField(value);
			}
			else if (name.equals(SORT_ORDER_PARAM)) {
			    if (value.equals(SORT_ORDER_DESCENDING)) {
			      solr_src.setSortOrder(SolrQueryWrapper.SORT_DESCENDING);
			    } else {
			      solr_src.setSortOrder(SolrQueryWrapper.SORT_ASCENDING);
			    }
			  }
                        else if (name.equals(LEVEL_PARAM) && !service_name.equals(QUICK_QUERY_SERVICE))
                        {
                          if (value.toUpperCase().equals("SEC"))
				{
					index = "sidx";
				}
				else
				{
					index = "didx";
				}
			}
			// Would facets ever come in through params???
			else if (name.equals("facets") && value.length() > 0)
			{
				String[] facets = value.split(",");

				for (String facet : facets)
				{
					solr_src.addFacet(facet);
				}
			}
			else if (name.equals(FACET_QUERIES_PARAM) && value.length() > 0)
			{
			    //logger.info("@@@ SOLR FACET VALUE FOUND: " + value);
				solr_src.addFacetQuery(value);
			}
			else if (name.equals(INDEX_SUBCOLLECTION_PARAM))
			{
				physical_sub_index_name = value;
			}
			else if (name.equals(INDEX_LANGUAGE_PARAM))
			{
				physical_index_language_name = value;
			} 
			else if (name.equals(DOC_FILTER_PARAM))
			{
				docFilter = value;
				docFilter = docFilter.replaceAll("[^A-Za-z0-9.]", "");
				solr_src.setDocFilter(value);
			}
                        else if (name.equals(HL_DOC_OID_PARAM))
                        {
                          //our highlighting doc param is used as a docFilter
                          solr_src.setDocFilter(value);
                          // if we are highlighting, set the highlight field
                          solr_src.setHighlightField(field);
                          solr_src.setHighlightingQuery(true);
                        }
                        
                        // ignore any others
		}
		// set up start and end results if necessary
		int start_results = 0;
		if (start_page != 1)
		{
			start_results = ((start_page - 1) * hits_per_page) ;
		}
		int end_results = hits_per_page * start_page;
		solr_src.setStartResults(start_results);
		solr_src.setEndResults(end_results);
		solr_src.setMaxDocs(maxdocs);

		if (index.equals(SECTION_INDEX) || index.equals(DOCUMENT_INDEX))
		{
			if (physical_sub_index_name != null)
			{
				index += physical_sub_index_name;
			}
			if (physical_index_language_name != null)
			{
				index += physical_index_language_name;
			}
		}

		// now we know the index level, we can dig out the required
		// solr-core, (caching the result in 'solr_client_core_cache')
		//String core_name = getCollectionCoreNamePrefix() + "-" + index;
		String core_name = index;
                if (solr_src.isHighlightingQuery()) {
                  // highlighting queries are always at section level
                  core_name = "sidx";
                }
                // do we need to modify the doc id?
		SolrClient solr_core = core_manager.getCore(core_name); //null;
		//CHECK HERE
		// if (!solr_client_core_cache.containsKey(core_name))
		// {		    
		//     solr_core = new HttpJdkSolrClient.Builder(this.solr_server_base_url)
                //       .withDefaultCollection(core_name)
                //       .build();
		//     solr_client_core_cache.put(core_name, solr_core);		    
		// }
		// else
		// {
		//     solr_core = solr_client_core_cache.get(core_name);
		// }

		solr_src.setSolrCore(solr_core);
		//solr_src.setCollectionCoreNamePrefix(getCollectionCoreNamePrefix());
		solr_src.initialise();
		return solr_src; // return true
	}

	/** do the query */
	protected Object runQuery(Object queryObject, String query)
	{
		try
		{
                  SolrQueryWrapper solr_src = (SolrQueryWrapper)queryObject;
                  if (solr_src.isHighlightingQuery() ) {
                    
                    //if it is a Highlighting Query - execute it
                    String rslt = solr_src.runHighlightingQuery(query);
                    // might be null if the section had none of the query terms in it
                    return rslt;
                  }
                  //logger.error("@@@@ Query is now: " + query);
                  SharedSoleneQueryResult sqr = solr_src.runQuery(query);
                  
                  return sqr;
		}
		catch (Exception e)
		{
			logger.error("Exception happened in run query: ", e);
		}

		return null;
	}
	
	
	/** get the total number of docs that match */
	protected long numDocsMatched(Object query_result)
	{
		return ((SharedSoleneQueryResult) query_result).getTotalDocs();

	}

	/** get the list of doc ids */
	protected String[] getDocIDs(Object query_result)
	{
		Vector docs = ((SharedSoleneQueryResult) query_result).getDocs();
		String[] doc_nums = new String[docs.size()];
		for (int d = 0; d < docs.size(); d++)
		{
			String doc_num = ((SharedSoleneQueryResult.DocInfo) docs.elementAt(d)).id_;
			doc_nums[d] = doc_num;
		}
		return doc_nums;
	}

	/** get the list of doc ranks */
	protected String[] getDocRanks(Object query_result)
	{
		Vector docs = ((SharedSoleneQueryResult) query_result).getDocs();
		String[] doc_ranks = new String[docs.size()];
		for (int d = 0; d < docs.size(); d++)
		{
			doc_ranks[d] = Float.toString(((SharedSoleneQueryResult.DocInfo) docs.elementAt(d)).rank_);
		}
		return doc_ranks;
	}

	/** add in term info if available */
	protected boolean addTermInfo(Element term_list, HashMap params, Object query_result)
	{
	  Document doc = term_list.getOwnerDocument();
		String query_level = (String) params.get(LEVEL_PARAM); // the current query level

		Vector terms = ((SharedSoleneQueryResult) query_result).getTerms();
		for (int t = 0; t < terms.size(); t++)
		{
			SharedSoleneQueryResult.TermInfo term_info = (SharedSoleneQueryResult.TermInfo) terms.get(t);

			Element term_elem = doc.createElement(GSXML.TERM_ELEM);
			term_elem.setAttribute(GSXML.NAME_ATT, term_info.term_);
			term_elem.setAttribute(FREQ_ATT, "" + term_info.term_freq_);
			term_elem.setAttribute(NUM_DOCS_MATCH_ATT, "" + term_info.match_docs_);
			term_elem.setAttribute(FIELD_ATT, term_info.field_);
			term_list.appendChild(term_elem);
		}

		Vector stopwords = ((SharedSoleneQueryResult) query_result).getStopWords();
		for (int t = 0; t < stopwords.size(); t++)
		{
			String stopword = (String) stopwords.get(t);

			Element stopword_elem = doc.createElement(GSXML.STOPWORD_ELEM);
			stopword_elem.setAttribute(GSXML.NAME_ATT, stopword);
			term_list.appendChild(stopword_elem);
		}

		return true;
	}

  protected ArrayList<FacetWrapper> getFacets(Object query_result, String lang)
	{
		if (!(query_result instanceof SolrQueryResult))
		{
			return null;
		}

		SolrQueryResult result = (SolrQueryResult) query_result;
		List<FacetField> facets = result.getFacetResults();

		if (facets == null)
		{
			return null;
		}

		ArrayList<FacetWrapper> newFacetList = new ArrayList<FacetWrapper>();

		for (FacetField facet : facets)
		{
		  SolrFacetWrapper wrap = new SolrFacetWrapper(facet);
		  String fname = wrap.getName();
		  String dname = getDisplayText(_facet_display_names.get(fname), GSXML.DISPLAY_TEXT_NAME, lang, "en", "metadata_names");
		  wrap.setDisplayName(dname);		    
		  newFacetList.add(wrap);
		}

		return newFacetList;
	}
	@Override
	protected Map<String, Map<String, List<String>>> getHighlightSnippets(Object query_result)
	{
		if (!(query_result instanceof SolrQueryResult))
		{
			return null;
		}

		SolrQueryResult result = (SolrQueryResult) query_result;
		
		return result.getHighlightResults();
	}


    // protected String getCollectionCoreNamePrefix() {
    //     String site_name = this.router.getSiteName();
    //     String coll_name = this.cluster_name;
    //     String collection_core_name_prefix = site_name + "-" + coll_name;
    //     return collection_core_name_prefix;
    // }


    // The following is not currently used
    //
    // If we do end up switching back to using loadSolrCores() rather than checkSolrCores(), then
    // it needs to store the created solrClient so it can be properly closed down, otherwise
    // there are spawned threads that prevent the main Tomcat server from shutting down
    //
    // Note, the use of one SolrClient per core is already a rather resource expensive approach
    // Ideally should refactor so there is only one (ideally) per servlet
    
    /*
	private boolean loadSolrCores() {
		
          SolrClient solrClient = new HttpJdkSolrClient.Builder(this.solr_server_base_url)
            .withConnectionTimeout(3, TimeUnit.SECONDS)
            .build();
		// Max retries
		//solrServer.setMaxRetries(1); // retries not availabel anymore
		// Connection Timeout
		//solrServer.setConnectionTimeout(3000);
		//Cores
		for (int i=0; i<_corenames.size(); i++) {
		    String this_core = getCollectionCoreNamePrefix()+"-"+_corenames.get(i);
		    
		    if (!checkSolrCore(this_core, solrClient)){
		      if (!activateSolrCore(this_core, solrClient)){
			logger.error("Couldn't activate Solr core " + this_core + " for collection " + cluster_name);
			return false;
		      }
		    }
		}
		return true;
	}
    */

    // Not used?    
    // private boolean checkSolrCoreUNUSED(String coreName, SolrClient solrClient) {
    //     	CoreAdminRequest adminRequest = new CoreAdminRequest();
		
    //     	try {
    //               CoreStatus rsp = adminRequest.getCoreStatus(coreName, solrClient);
    //               System.out.println("Core "+coreName+" exists, status: " + rsp.toString());                
               
    //     	} catch (SolrServerException e) {
    //               logger.warn("Solr core " + coreName + " for collection " + cluster_name + " does not exist: " + e.getMessage());
                 
    //     		return false;
    //     	} catch (IOException e) {
    //     		e.printStackTrace();
    //     		return false;
    //     	}
    //     	// catch (RemoteSolrException e1){
    //     	// 	logger.error("Check solr core " + coreName + " for collection " + cluster_name + " failed.");
    //     	// 	e1.printStackTrace();
    //     	// 	return false;
    //     	// }
    //     	return true;
    //     }

    // // not used??
    // private String getSolrDataDirForCollUNUSED(String site_name, String cluster_name, String core_name) {
    //     return this.solr_core_location + site_name+File.separator+cluster_name+File.separator+core_name;
    // }
    
    // not used?
	// private boolean activateSolrCoreUNUSED(String coreName, SolrClient solrClient) {
          
        //   //String dataDir = GSFile.collectionIndexDir(site_home, cluster_name) + File.separator + coreName.substring(coreName.length() - 4);
        //   //String instanceDir = GSFile.collectionEtcDir(site_home, cluster_name);
        //   String instanceDir = getSolrDataDirForColl(this.router.getSiteName(), this.cluster_name, coreName);
        //   try {
        //     CoreAdminRequest.createCore(coreName, instanceDir, solrClient);
        //     logger.warn("Solr core " + coreName + " for collection " + cluster_name + " activated.");
        //   } catch (SolrServerException e1) {
        //     logger.error("exception happened when trying to create core "+coreName+": "+e1.getMessage());
        //     e1.printStackTrace();
        //     return false;
        //   } catch (IOException e1) {
        //     e1.printStackTrace();
        //     return false;
        //   } // catch (RemoteSolrException e1){
        //   //       logger.error("Activation solr core " + coreName + " for collection " + cluster_name + " failed.");
        //   //       e1.printStackTrace();
        //   //       return false;
        //   //}
  
        //   return true;
	// }
	
}