<?php
/**
 *
 * ProcessMaker Open Source Edition
 * Copyright (C) 2004 - 2012 Colosa Inc.23
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 *
 * For more information, contact Colosa Inc, 5304 Ventura Drive,
 * Delray Beach, FL, 33484, USA, or email info@colosa.com.
 *
 */


/**
 * Interface to the Solr Search server 
 * @author Herbert Saal Gutierrez
 *
 */
class BpmnEngine_SearchIndexAccess_Solr
{
  const SOLR_VERSION = '&version=2.2';
  private $_solrIsEnabled = false;
  private $_solrHost = "";
  
  public function __construct($solrIsEnabled = false, $solrHost = "")
  {
    // use the parameters to initialize class
    $this->_solrIsEnabled = $solrIsEnabled;
    $this->_solrHost = $solrHost;
  }
  
  /**
   * Verify if the Solr service is available
   * @gearman = false
   * @rest = false
   * @background = false
   *
   * @return bool
   */
  public function isEnabled($workspace)
  {
    $resultServerStatus = false;

    //if($this->_solrIsEnabled != true)
      //return $resultServerStatus;

    // verify solr server response
    try{
      $resultServerStatus = $this->ping($workspace);
    }catch(Exception $ex){
      $resultServerStatus = false;    
    }
    
    return $resultServerStatus;
  }
  
  /**
   * Returns the total number of indexed documents
   * @gearman = false
   * @rest = false
   * @background = false
   *
   * @param
   *          workspace: workspace name
   * @return total
   */
  public function getNumberDocuments($workspace)
  {
    //if (! $this->_solrIsEnabled)
      //return;
      // get configuration information in base to workspace parameter
      
    // get total number of documents in registry
    $solrIntruct = (substr ($this->_solrHost, - 1) == "/") ? $this->_solrHost : $this->_solrHost . "/";
    $solrIntruct .= $workspace;
    $solrIntruct .= "/select/?q=*:*";
    $solrIntruct .= self::SOLR_VERSION;
    $solrIntruct .= "&start=0&rows=0&echoParams=none&wt=json";
    
    $handlerTotal = curl_init ($solrIntruct);
    curl_setopt ($handlerTotal, CURLOPT_RETURNTRANSFER, true);

    //Apply proxy settings
    $sysConf = PMSystem::getSystemConfiguration();
    if ($sysConf['proxy_host'] != '') {
      curl_setopt($handlerTotal, CURLOPT_PROXY, $sysConf['proxy_host'] . ($sysConf['proxy_port'] != '' ? ':' . $sysConf['proxy_port'] : ''));
      if ($sysConf['proxy_port'] != '') {
        curl_setopt($handlerTotal, CURLOPT_PROXYPORT, $sysConf['proxy_port']);
      }
      if ($sysConf['proxy_user'] != '') {
        curl_setopt($handlerTotal, CURLOPT_PROXYUSERPWD, $sysConf['proxy_user'] . ($sysConf['proxy_pass'] != '' ? ':' . $sysConf['proxy_pass'] : ''));
      }
      curl_setopt($handlerTotal, CURLOPT_HTTPHEADER, array('Expect:'));
    }

    $responseTotal = curl_exec ($handlerTotal);
    curl_close ($handlerTotal);
    
    // verify the result of solr
    $responseSolrTotal = G::json_decode ($responseTotal);
    if ($responseSolrTotal->responseHeader->status != 0) {
      throw new Exception (date('Y-m-d H:i:s:u') . " Error returning the total number of documents in Solr." . $solrIntruct . " response error: " . $response . "\n");
    }
    $numTotalDocs = $responseSolrTotal->response->numFound;
    return $numTotalDocs;
  }
  
  /**
   * Execute a query in base to Requested data
   * @gearman = false
   * @rest = false
   * @background = false
   *
   * @return solr response
   */
  public function executeQuery($solrRequestData)
  {
    //if (! $this->_solrIsEnabled)
      //return;
    $solrIntruct = '';
    // get configuration information in base to workspace parameter
    $workspace = $solrRequestData->workspace;
    
    // format request
    $query = empty ($solrRequestData->searchText) ? '*:*' : $solrRequestData->searchText;
    $query = rawurlencode ($query);
    $start = '&start=' . $solrRequestData->startAfter;
    $rows = '&rows=' . $solrRequestData->pageSize;
    $fieldList = '';
    $cols = $solrRequestData->includeCols;
    if (! empty ($cols)) {
      $fieldList = "&fl=" . implode (",", $cols);
    }
    $sort = '';
    if ($solrRequestData->numSortingCols > 0) {
      $sort = '&sort=';
      for ($i = 0; $i < $solrRequestData->numSortingCols; $i ++) {
        $sort .= $solrRequestData->sortCols [$i] . "%20" . $solrRequestData->sortDir [$i] . ",";
      }
      
      $sort = substr_replace ($sort, "", - 1);
    }
    $resultFormat = empty ($solrRequestData->resultFormat) ? '' : '&wt=' . $solrRequestData->resultFormat;
    $filters = '';
    $aFilters = explode (',', $solrRequestData->filterText);
    foreach ($aFilters as $value) {
      $filters .= '&fq=' . urlencode ($value);
    }
    
    $solrIntruct = (substr ($this->_solrHost, - 1) == "/") ? $this->_solrHost : $this->_solrHost . "/";
    $solrIntruct .= $workspace;
    $solrIntruct .= "/select/?q=$query";
    $solrIntruct .= "&echoParams=none";
    $solrIntruct .= self::SOLR_VERSION;
    $solrIntruct .= $start;
    $solrIntruct .= $rows;
    $solrIntruct .= $fieldList;
    $solrIntruct .= $sort;
    $solrIntruct .= $filters;
    $solrIntruct .= $resultFormat;
    // send query
    // search the cases in base to datatable parameters
    $handler = curl_init ($solrIntruct);
    curl_setopt ($handler, CURLOPT_RETURNTRANSFER, true);

    //Apply proxy settings
    $sysConf = PMSystem::getSystemConfiguration();
    if ($sysConf['proxy_host'] != '') {
      curl_setopt($handler, CURLOPT_PROXY, $sysConf['proxy_host'] . ($sysConf['proxy_port'] != '' ? ':' . $sysConf['proxy_port'] : ''));
      if ($sysConf['proxy_port'] != '') {
        curl_setopt($handler, CURLOPT_PROXYPORT, $sysConf['proxy_port']);
      }
      if ($sysConf['proxy_user'] != '') {
        curl_setopt($handler, CURLOPT_PROXYUSERPWD, $sysConf['proxy_user'] . ($sysConf['proxy_pass'] != '' ? ':' . $sysConf['proxy_pass'] : ''));
      }
      curl_setopt($handler, CURLOPT_HTTPHEADER, array('Expect:'));
    }

    $response = curl_exec ($handler);
    curl_close ($handler);
    
    // decode
    $responseSolr = G::json_decode ($response);
    if ($responseSolr->responseHeader->status != 0) {
      throw new Exception (date('Y-m-d H:i:s:u') . " Error executing query to Solr." . $solrIntruct . " response error: " . $response . "\n");
    }
    
    return $responseSolr;
  }
  
  /**
   * Insert or Update document index
   * @gearman = false
   * @rest = false
   * @background = false
   *
   * @return solr response
   */
  public function updateDocument($solrUpdateDocument)
  {
    //if (! $this->_solrIsEnabled)
      //return;
    $solrIntruct = '';
    // get configuration information in base to workspace parameter
    $solrIntruct = (substr ($this->_solrHost, - 1) == "/") ? $this->_solrHost : $this->_solrHost . "/";
    $solrIntruct .= $solrUpdateDocument->workspace;
    $solrIntruct .= "/update";
    
    $handler = curl_init ($solrIntruct);
    curl_setopt ($handler, CURLOPT_RETURNTRANSFER, true);
    curl_setopt ($handler, CURLOPT_HTTPHEADER, array (
        'Content-type:application/xml' 
    )); // -H
    curl_setopt ($handler, CURLOPT_BINARYTRANSFER, TRUE); // --data-binary
    curl_setopt ($handler, CURLOPT_POSTFIELDS, $solrUpdateDocument->document); // data

    //Apply proxy settings
    $sysConf = PMSystem::getSystemConfiguration();
    if ($sysConf['proxy_host'] != '') {
      curl_setopt($handler, CURLOPT_PROXY, $sysConf['proxy_host'] . ($sysConf['proxy_port'] != '' ? ':' . $sysConf['proxy_port'] : ''));
      if ($sysConf['proxy_port'] != '') {
        curl_setopt($handler, CURLOPT_PROXYPORT, $sysConf['proxy_port']);
      }
      if ($sysConf['proxy_user'] != '') {
        curl_setopt($handler, CURLOPT_PROXYUSERPWD, $sysConf['proxy_user'] . ($sysConf['proxy_pass'] != '' ? ':' . $sysConf['proxy_pass'] : ''));
      }
      curl_setopt($handler, CURLOPT_HTTPHEADER, array('Expect:'));
    }

    $response = curl_exec ($handler);
    curl_close ($handler);
    
    $swOk = strpos ($response, '<int name="status">0</int>');
    if (! $swOk) {
      throw new Exception (date('Y-m-d H:i:s:u') . " Error updating document in Solr." . $solrIntruct . " response error: " . $response . "\n");
    }
  }
  
  /**
   * Commit the changes since the last commit
   * @gearman = false
   * @rest = false
   * @background = false
   *
   * @return solr response
   */
  public function commitChanges($workspace)
  {
    //if (! $this->_solrIsEnabled)
      //return;
    $solrIntruct = '';
    // get configuration information in base to workspace parameter
    $solrIntruct = (substr ($this->_solrHost, - 1) == "/") ? $this->_solrHost : $this->_solrHost . "/";
    $solrIntruct .= $workspace;
    $solrIntruct .= "/update";
    
    $handler = curl_init ($solrIntruct);
    curl_setopt ($handler, CURLOPT_RETURNTRANSFER, true);
    curl_setopt ($handler, CURLOPT_HTTPHEADER, array (
        'Content-type:application/xml' 
    )); // -H
    curl_setopt ($handler, CURLOPT_BINARYTRANSFER, TRUE); // --data-binary
    curl_setopt ($handler, CURLOPT_POSTFIELDS, "<commit/>"); // data

    //Apply proxy settings
    $sysConf = PMSystem::getSystemConfiguration();
    if ($sysConf['proxy_host'] != '') {
      curl_setopt($handler, CURLOPT_PROXY, $sysConf['proxy_host'] . ($sysConf['proxy_port'] != '' ? ':' . $sysConf['proxy_port'] : ''));
      if ($sysConf['proxy_port'] != '') {
        curl_setopt($handler, CURLOPT_PROXYPORT, $sysConf['proxy_port']);
      }
      if ($sysConf['proxy_user'] != '') {
        curl_setopt($handler, CURLOPT_PROXYUSERPWD, $sysConf['proxy_user'] . ($sysConf['proxy_pass'] != '' ? ':' . $sysConf['proxy_pass'] : ''));
      }
      curl_setopt($handler, CURLOPT_HTTPHEADER, array('Expect:'));
    }

    $response = curl_exec ($handler);
    curl_close ($handler);
    
    $swOk = strpos ($response, '<int name="status">0</int>');
    if (! $swOk) {
      throw new Exception (date('Y-m-d H:i:s:u') . " Error commiting changes in Solr." . $solrIntruct . " response error: " . $response . "\n");
    }
  }
  
  /**
   * Rollback the changes since the last commit
   * @gearman = false
   * @rest = false
   * @background = false
   *
   * @return solr response
   */
  public function rollbackChanges($workspace)
  {
    //if (! $this->_solrIsEnabled)
      //return;
    
    $solrIntruct = '';
    // get configuration information in base to workspace parameter
    $solrIntruct = (substr ($this->_solrHost, - 1) == "/") ? $this->_solrHost : $this->_solrHost . "/";
    $solrIntruct .= $workspace;
    $solrIntruct .= "/update";
    
    $handler = curl_init ($solrIntruct);
    curl_setopt ($handler, CURLOPT_RETURNTRANSFER, true);
    curl_setopt ($handler, CURLOPT_HTTPHEADER, array (
        'Content-type:application/xml' 
    )); // -H
    curl_setopt ($handler, CURLOPT_BINARYTRANSFER, TRUE); // --data-binary
    curl_setopt ($handler, CURLOPT_POSTFIELDS, "<rollback/>"); // data

    //Apply proxy settings
    $sysConf = PMSystem::getSystemConfiguration();
    if ($sysConf['proxy_host'] != '') {
      curl_setopt($handler, CURLOPT_PROXY, $sysConf['proxy_host'] . ($sysConf['proxy_port'] != '' ? ':' . $sysConf['proxy_port'] : ''));
      if ($sysConf['proxy_port'] != '') {
        curl_setopt($handler, CURLOPT_PROXYPORT, $sysConf['proxy_port']);
      }
      if ($sysConf['proxy_user'] != '') {
        curl_setopt($handler, CURLOPT_PROXYUSERPWD, $sysConf['proxy_user'] . ($sysConf['proxy_pass'] != '' ? ':' . $sysConf['proxy_pass'] : ''));
      }
      curl_setopt($handler, CURLOPT_HTTPHEADER, array('Expect:'));
    }

    $response = curl_exec ($handler);
    curl_close ($handler);
    
    $swOk = strpos ($response, '<int name="status">0</int>');
    if (! $swOk) {
      throw new Exception (date('Y-m-d H:i:s:u') . " Error rolling back changes in Solr." . $solrIntruct . " response error: " . $response . "\n");
    }
  }
  
  /**
   * Optimize Solr index
   * @gearman = false
   * @rest = false
   * @background = false
   *
   * @return solr response
   */
  public function optimizeChanges($workspace)
  {
    //if (! $this->_solrIsEnabled)
      //return;
    
    $solrIntruct = '';
    // get configuration information in base to workspace parameter
    $solrIntruct = (substr ($this->_solrHost, - 1) == "/") ? $this->_solrHost : $this->_solrHost . "/";
    $solrIntruct .= $workspace;
    $solrIntruct .= "/update";
    
    $handler = curl_init ($solrIntruct);
    curl_setopt ($handler, CURLOPT_RETURNTRANSFER, true);
    curl_setopt ($handler, CURLOPT_HTTPHEADER, array (
        'Content-type:application/xml' 
    )); // -H
    curl_setopt ($handler, CURLOPT_BINARYTRANSFER, TRUE); // --data-binary
    curl_setopt ($handler, CURLOPT_POSTFIELDS, "<optimize/>"); // data

    //Apply proxy settings
    $sysConf = PMSystem::getSystemConfiguration();
    if ($sysConf['proxy_host'] != '') {
      curl_setopt($handler, CURLOPT_PROXY, $sysConf['proxy_host'] . ($sysConf['proxy_port'] != '' ? ':' . $sysConf['proxy_port'] : ''));
      if ($sysConf['proxy_port'] != '') {
        curl_setopt($handler, CURLOPT_PROXYPORT, $sysConf['proxy_port']);
      }
      if ($sysConf['proxy_user'] != '') {
        curl_setopt($handler, CURLOPT_PROXYUSERPWD, $sysConf['proxy_user'] . ($sysConf['proxy_pass'] != '' ? ':' . $sysConf['proxy_pass'] : ''));
      }
      curl_setopt($handler, CURLOPT_HTTPHEADER, array('Expect:'));
    }

    $response = curl_exec ($handler);
    curl_close ($handler);
    
    $swOk = strpos ($response, '<int name="status">0</int>');
    if (! $swOk) {
      throw new Exception (date('Y-m-d H:i:s:u') . " Error optimizing changes in Solr." . $solrIntruct . " response error: " . $response . "\n");
    }
  }
  
  /**
   * Return the list of the stored fields in Solr
   * 
   * @param string $workspace
   *          Solr instance name
   * @throws Exception
   * @return void mixed of field names
   */
  public function getListIndexedStoredFields($workspace)
  {
    //if (! $this->_solrIsEnabled)
      //return;
    
    $solrIntruct = '';
    // get configuration information in base to workspace parameter
    $solrIntruct = (substr ($this->_solrHost, - 1) == "/") ? $this->_solrHost : $this->_solrHost . "/";
    $solrIntruct .= $workspace;
    $solrIntruct .= "/admin/luke?numTerms=0&wt=json";
    
    $handler = curl_init ($solrIntruct);
    curl_setopt ($handler, CURLOPT_RETURNTRANSFER, true);

    //Apply proxy settings
    $sysConf = PMSystem::getSystemConfiguration();
    if ($sysConf['proxy_host'] != '') {
      curl_setopt($handler, CURLOPT_PROXY, $sysConf['proxy_host'] . ($sysConf['proxy_port'] != '' ? ':' . $sysConf['proxy_port'] : ''));
      if ($sysConf['proxy_port'] != '') {
        curl_setopt($handler, CURLOPT_PROXYPORT, $sysConf['proxy_port']);
      }
      if ($sysConf['proxy_user'] != '') {
        curl_setopt($handler, CURLOPT_PROXYUSERPWD, $sysConf['proxy_user'] . ($sysConf['proxy_pass'] != '' ? ':' . $sysConf['proxy_pass'] : ''));
      }
      curl_setopt($handler, CURLOPT_HTTPHEADER, array('Expect:'));
    }

    $response = curl_exec ($handler);
    curl_close ($handler);
    // decode
    $responseSolr = G::json_decode ($response);
    if ($responseSolr->responseHeader->status != 0) {
      throw new Exception (date('Y-m-d H:i:s:u') . " Error getting index fields in Solr." . $solrIntruct . " response error: " . $response . "\n");
    }
    return $responseSolr;
  }
  
  /**
   * Ping the Solr Server to check his health
   * 
   * @param string $workspace
   *          Solr instance name
   * @throws Exception
   * @return void mixed of field names
   */
  public function ping($workspace)
  {
    //if (! $this->_solrIsEnabled)
      //return;
    
    $solrIntruct = '';
    // get configuration information in base to workspace parameter
    $solrIntruct = (substr ($this->_solrHost, - 1) == "/") ? $this->_solrHost : $this->_solrHost . "/";
    $solrIntruct .= $workspace;
    $solrIntruct .= "/admin/ping?wt=json";
    
    $handler = curl_init ($solrIntruct);
    curl_setopt ($handler, CURLOPT_RETURNTRANSFER, true);
    $response = curl_exec ($handler);
    curl_close ($handler);

    //there's no response
    if(!$response)
      return false;

    // decode
    $responseSolr = G::json_decode ($response);
    if ($responseSolr->responseHeader->status != "OK") {
      throw new Exception (date('Y-m-d H:i:s:u') . " Error pinging Solr server." . $solrIntruct . " response error: " . $response . "\n");
    }
    return true;
  }

  /**
   * Delete all documents from index
   * @gearman = false
   * @rest = false
   * @background = false
   *
   * @return solr response
   */
  public function deleteAllDocuments($workspace)
  {
    //if (! $this->_solrIsEnabled)
      //return;
      // $registry = Zend_Registry::getInstance();
    
    $solrIntruct = '';
    // get configuration information in base to workspace parameter
    $solrIntruct = (substr ($this->_solrHost, - 1) == "/") ? $this->_solrHost : $this->_solrHost . "/";
    $solrIntruct .= $workspace;
    $solrIntruct .= "/update";
    
    $handler = curl_init ($solrIntruct);
    curl_setopt ($handler, CURLOPT_RETURNTRANSFER, true);
    curl_setopt ($handler, CURLOPT_HTTPHEADER, array (
        'Content-type:application/xml' 
    )); // -H
    curl_setopt ($handler, CURLOPT_BINARYTRANSFER, TRUE); // --data-binary
    curl_setopt ($handler, CURLOPT_POSTFIELDS, "<delete><query>*:*</query></delete>"); // data

    //Apply proxy settings
    $sysConf = PMSystem::getSystemConfiguration();
    if ($sysConf['proxy_host'] != '') {
      curl_setopt($handler, CURLOPT_PROXY, $sysConf['proxy_host'] . ($sysConf['proxy_port'] != '' ? ':' . $sysConf['proxy_port'] : ''));
      if ($sysConf['proxy_port'] != '') {
        curl_setopt($handler, CURLOPT_PROXYPORT, $sysConf['proxy_port']);
      }
      if ($sysConf['proxy_user'] != '') {
        curl_setopt($handler, CURLOPT_PROXYUSERPWD, $sysConf['proxy_user'] . ($sysConf['proxy_pass'] != '' ? ':' . $sysConf['proxy_pass'] : ''));
      }
      curl_setopt($handler, CURLOPT_HTTPHEADER, array('Expect:'));
    }

    $response = curl_exec ($handler);
    
    curl_close ($handler);
    
    $swOk = strpos ($response, '<int name="status">0</int>');
    if (! $swOk) {
      throw new Exception (date('Y-m-d H:i:s:u') . " Error deleting all documents in Solr." . $solrIntruct . " response error: " . $response . "\n");
    }
  }
  
  /**
   * Delete specified documents from index
   * @gearman = false
   * @rest = false
   * @background = false
   *
   * @return solr response
   */
  public function deleteDocument($workspace, $idQuery)
  {
    //if (! $this->_solrIsEnabled)
      //return;
      // $registry = Zend_Registry::getInstance();
    
    $solrIntruct = '';
    // get configuration information in base to workspace parameter
    $solrIntruct = (substr ($this->_solrHost, - 1) == "/") ? $this->_solrHost : $this->_solrHost . "/";
    $solrIntruct .= $workspace;
    $solrIntruct .= "/update";
    
    $handler = curl_init ($solrIntruct);
    curl_setopt ($handler, CURLOPT_RETURNTRANSFER, true);
    curl_setopt ($handler, CURLOPT_HTTPHEADER, array (
        'Content-type:application/xml' 
    )); // -H
    curl_setopt ($handler, CURLOPT_BINARYTRANSFER, TRUE); // --data-binary
    curl_setopt ($handler, CURLOPT_POSTFIELDS, "<delete><query>" . $idQuery . "</query></delete>"); // data

    //Apply proxy settings
    $sysConf = PMSystem::getSystemConfiguration();
    if ($sysConf['proxy_host'] != '') {
      curl_setopt($handler, CURLOPT_PROXY, $sysConf['proxy_host'] . ($sysConf['proxy_port'] != '' ? ':' . $sysConf['proxy_port'] : ''));
      if ($sysConf['proxy_port'] != '') {
        curl_setopt($handler, CURLOPT_PROXYPORT, $sysConf['proxy_port']);
      }
      if ($sysConf['proxy_user'] != '') {
        curl_setopt($handler, CURLOPT_PROXYUSERPWD, $sysConf['proxy_user'] . ($sysConf['proxy_pass'] != '' ? ':' . $sysConf['proxy_pass'] : ''));
      }
      curl_setopt($handler, CURLOPT_HTTPHEADER, array('Expect:'));
    }

    $response = curl_exec ($handler);
    
    curl_close ($handler);
    
    $swOk = strpos ($response, '<int name="status">0</int>');
    if (! $swOk) {
      throw new Exception (date('Y-m-d H:i:s:u') . " Error deleting document in Solr." . $solrIntruct . " response error: " . $response . "\n");
    }
  }
  
  /**
   * Execute a query in base to Request data
   *
   * @param Entity_FacetRequest $facetRequestEntity          
   * @return solr response: list of facets array
   */
  public function getFacetsList($facetRequest)
  {
    //if (! $this->_solrIsEnabled)
      //return;
    
    $solrIntruct = '';
    // get configuration information in base to workspace parameter
    $workspace = $facetRequest->workspace;
    
    // format request
    $query = empty ($facetRequest->searchText) ? '*:*' : $facetRequest->searchText;
    $query = rawurlencode ($query);
    $start = '&start=0';
    $rows = '&rows=0';
    $facets = '&facet=on&facet.mincount=1&facet.limit=20'; // enable facet and
                                                           // only return facets
                                                           // with minimun one
                                                           // instance
    foreach ($facetRequest->facetFields as $value) {
      $facets .= '&facet.field=' . $value;
    }
    foreach ($facetRequest->facetQueries as $value) {
      $facets .= '&facet.query=' . $value;
    }
    if (! empty ($facetRequest->facetDates)) {
      foreach ($facetRequest->facetDates as $value) {
        $facets .= '&facet.date=' . $value;
      }
      $facets .= '&facet.date.start=' . $facetRequest->facetDatesStart;
      $facets .= '&facet.date.end=' . $facetRequest->facetDatesEnd;
      $facets .= '&facet.date.gap=' . $facetRequest->facetDateGap;
    }
    $filters = '';
    foreach ($facetRequest->filters as $value) {
      $filters .= '&fq=' . $value;
    }
    // echo "<pre>";
    
    $resultFormat = '&wt=json';
    
    $solrIntruct = (substr ($this->_solrHost, - 1) == "/") ? $this->_solrHost : $this->_solrHost . "/";
    $solrIntruct .= $workspace;
    $solrIntruct .= "/select/?q=$query";
    $solrIntruct .= "&echoParams=none";
    $solrIntruct .= self::SOLR_VERSION;
    $solrIntruct .= $start;
    $solrIntruct .= $rows;
    $solrIntruct .= $facets;
    $solrIntruct .= $filters;
    $solrIntruct .= $resultFormat;
    
    // send query
    // search the cases in base to datatable parameters
    $handler = curl_init ($solrIntruct);
    curl_setopt ($handler, CURLOPT_RETURNTRANSFER, true);

    //Apply proxy settings
    $sysConf = PMSystem::getSystemConfiguration();
    if ($sysConf['proxy_host'] != '') {
      curl_setopt($handler, CURLOPT_PROXY, $sysConf['proxy_host'] . ($sysConf['proxy_port'] != '' ? ':' . $sysConf['proxy_port'] : ''));
      if ($sysConf['proxy_port'] != '') {
        curl_setopt($handler, CURLOPT_PROXYPORT, $sysConf['proxy_port']);
      }
      if ($sysConf['proxy_user'] != '') {
        curl_setopt($handler, CURLOPT_PROXYUSERPWD, $sysConf['proxy_user'] . ($sysConf['proxy_pass'] != '' ? ':' . $sysConf['proxy_pass'] : ''));
      }
      curl_setopt($handler, CURLOPT_HTTPHEADER, array('Expect:'));
    }

    $response = curl_exec ($handler);
    curl_close ($handler);
    
    // decode
    $responseSolr = G::json_decode ($response);
    if ($responseSolr->responseHeader->status != 0) {
      throw new Exception (date('Y-m-d H:i:s:u') . " Error getting faceted list from Solr." . $solrIntruct . " response error: " . $response . "\n");
    }
    
    return $responseSolr;
  }
}