/**
  * Returns encoded Semantic Domain Editor Dto:
  * 1) Loads all items of target project (langauge we are translating into)
  * 2) Loads all items of source project (language we are translating from)
  * 3) Sets values from source projects as sources on target items
  * @param string $projectId
  * @param string $userId
  * @param string $lastFetchTime
  * @param int $offset
  * @return array multitype:boolean number multitype: multitype:string  Ambigous <string;, multitype:, string, Ambigous <multitype:, multitype:multitype: unknown >, Ambigous <multitype:, \stdClass, multitype:multitype: unknown >, Ambigous <string, multitype:NULL string >>
  */
 public static function encode($projectId, $userId, $lastFetchTime = null, $offset = 0)
 {
     $data = array();
     // load target project
     $project = new SemDomTransProjectModel($projectId);
     // load source project - if source language is not specified, set it to english
     if ($project->sourceLanguageProjectId == null) {
         $sourceProject = new SemDomTransProjectModel();
         $sourceProject->projectCode = "semdom-en-{$project->semdomVersion}";
         $sourceProject->readByProperty("projectCode", $sourceProject->projectCode);
     } else {
         $sourceProject = new SemDomTransProjectModel($project->sourceLanguageProjectId->asString());
     }
     // load target project items
     $items = new SemDomTransItemListModel($project, $lastFetchTime);
     $items->read();
     $targetItems = $items->entries;
     $sourceItemsModel = new SemDomTransItemListModel($sourceProject);
     $sourceItemsModel->read();
     $sourceItems = $sourceItemsModel->entries;
     //print_r($sourceItems);
     $sourceItemsByKey = array();
     foreach ($sourceItems as $item) {
         $sourceItemsByKey[$item['key']] = $item;
     }
     // suplement the target language data with source language values
     $sourceLanguageIsIncomplete = false;
     // loop over all target items
     foreach ($targetItems as $i => $item) {
         // loop over all properties of target item
         foreach ($item as $outerProp => $outerValue) {
             // make sure that the outer value is an array and that the translation for it exists
             if (is_array($outerValue) && key_exists('translation', $outerValue)) {
                 // source item has translation that is non empty, than set it as source of arget item
                 if ($sourceItemsByKey[$item['key']][$outerProp]['translation'] != '') {
                     $targetItems[$i][$outerProp]['source'] = $sourceItemsByKey[$item['key']][$outerProp]['translation'];
                 } else {
                     $sourceLanguageIsIncomplete = true;
                 }
             }
             // handle special case of search keys
             if ($outerProp == 'searchKeys') {
                 // iterate over all search keys
                 foreach ($outerValue as $innerProp => $innerValue) {
                     // check if corresponding source item has search keys
                     if (array_key_exists($innerProp, $sourceItemsByKey[$item['key']][$outerProp])) {
                         // if source item has search keys, and given search key has translation set on it
                         // use that translation as source of target item search key
                         if ($sourceItemsByKey[$item['key']][$outerProp][$innerProp]['translation'] != '') {
                             $targetItems[$i][$outerProp][$innerProp]['source'] = $sourceItemsByKey[$item['key']][$outerProp][$innerProp]['translation'];
                         } else {
                             $sourceLanguageIsIncomplete = true;
                         }
                     }
                 }
             } else {
                 if ($outerProp == 'questions') {
                     // iterate over all questions
                     foreach ($outerValue as $innerProp => $innerValue) {
                         // check that 'questions' property exists on source item
                         if (array_key_exists($innerProp, $sourceItemsByKey[$item['key']][$outerProp])) {
                             // if source item has questions, and given question has translation set on it
                             // use that translation as source of target item question
                             if ($sourceItemsByKey[$item['key']][$outerProp][$innerProp]['question']['translation'] != '') {
                                 $targetItems[$i][$outerProp][$innerProp]['question']['source'] = $sourceItemsByKey[$item['key']][$outerProp][$innerProp]['question']['translation'];
                             } else {
                                 $sourceLanguageIsIncomplete = true;
                             }
                             // if source item has questions, and given question term has translation set on it
                             // use that translation as source of target item question term
                             if ($sourceItemsByKey[$item['key']][$outerProp][$innerProp]['terms']['translation'] != '') {
                                 $targetItems[$i][$outerProp][$innerProp]['terms']['source'] = $sourceItemsByKey[$item['key']][$outerProp][$innerProp]['terms']['translation'];
                             } else {
                                 $sourceLanguageIsIncomplete = true;
                             }
                         } else {
                             $sourceLanguageIsIncomplete = true;
                         }
                     }
                 }
             }
         }
     }
     $data['sourceLanguageIsIncomplete'] = $sourceLanguageIsIncomplete;
     // load comments
     $commentsModel = new LexCommentListModel($project, $lastFetchTime);
     $commentsModel->readAsModels();
     $encodedModels = LexDbeDtoCommentsEncoder::encode($commentsModel);
     $data['comments'] = $encodedModels["entries"];
     // load working sets
     $workingSets = new SemDomTransWorkingSetListModel($project, $lastFetchTime);
     $workingSets->read();
     $data["workingSets"] = $workingSets->entries;
     /*  if (!is_null($lastFetchTime)) {
             $deletedCommentsModel = new LexDeletedCommentListModel($project, $lastFetchTime);
             $deletedCommentsModel->read();
             $data['deletedCommentIds'] = array_map(function ($c) {return $c['id']; }, $deletedCommentsModel->entries);
         }
         */
     $data['entries'] = $targetItems;
     $data['timeOnServer'] = time();
     // future use for offline syncing
     $data["statuses"] = SemDomTransStatus::getSemdomStatuses();
     return $data;
 }