autocomplete for genres and langues search form fields is working

sites/all/modules/figli/edlp_search/edlp_search.routing.yml

@@ -15,6 +15,15 @@ edlp_search.edlp_search_controller_searchForm_ajax:
   requirements:
     _permission: 'access content'
 
+edlp_search.edlp_search_controller_autocomplete:
+  path: '/edlp_search/searchform/autocomplete'
+  defaults:
+    _controller: '\Drupal\edlp_search\Controller\EdlpSearchController::autocomplete'
+    _title: 'Autocomplete'
+  requirements:
+    _permission: 'access content'
+
+
 edlp_search.edlp_search_controller_search_results:
   path: '/edlp_search/searchresults'
   defaults:

sites/all/modules/figli/edlp_search/src/Controller/EdlpSearchController.php

@@ -21,11 +21,14 @@ class EdlpSearchController extends ControllerBase {
     */
    protected $formBuilder;
 
+   protected $sapi_index_id;
+
   /**
    * Construct.
    */
   public function __construct(FormBuilder $formBuilder) {
     $this->formBuilder = $formBuilder;
+    $this->sapi_index_id = "collection";
   }
 
   /**
@@ -78,6 +81,98 @@ class EdlpSearchController extends ControllerBase {
 
   }
 
+  public function autocomplete(Request $request){
+    // TODO: get field_name parameter
+    $this->request = $request;
+    $this->getRequestAutocompleteArgs();
+
+    // run a search on selected field and get the fields unique values
+    $this->autocompleteQuery();
+
+    $response = new JsonResponse($this->matches);
+    return $response;
+
+    // return array(
+    //   "#markup" => "autocomplete"
+    // );
+  }
+
+  /**
+  * autocompleteQuery
+  */
+  private function autocompleteQuery(){
+
+    // TODO: get the sapi index id with settings
+    /* @var $sapi_index \Drupal\search_api\IndexInterface */
+    $sapi_index = Index::load($this->sapi_index_id);
+    // dpm($sapi_index);
+
+    // Create the query.
+    $query = $sapi_index->query();
+
+    $query->setSearchID('edlp_search:autocomplete');
+
+    $parse_mode = \Drupal::getContainer()
+        ->get('plugin.manager.search_api.parse_mode')
+        ->createInstance('direct');
+    $query->setParseMode($parse_mode);
+
+    // $query->range(0, 20);
+
+    // workflow
+    $wf_condition_group = $query->createConditionGroup('OR');
+    $wf_condition_group->addCondition('field_workflow', 'corpus_documents_publie', "=");
+    // TODO: add condition with the other workflow field
+    $query->addConditionGroup($wf_condition_group);
+
+    // Search for keys.
+    if (!empty($this->keys)) {
+      // dpm($this->keys);
+      $query->keys($this->keys);
+    }
+
+    // select the field in which search will be performed
+    $query->setFulltextFields(array($this->field_name));
+
+    $result = $query->execute();
+    $items = $result->getResultItems();
+
+    $this->matches = [];
+    foreach ($items as $item) {
+      try {
+        /** @var \Drupal\Core\Entity\EntityInterface $entity */
+        $fields = $item->getField($this->field_name)->getValues();
+      }catch (SearchApiException $e) {
+        continue;
+      }
+      if (!$fields) {
+        continue;
+      }
+
+      $field_text = $fields[0]->getText();
+
+      if( in_array($field_text, $this->matches) ){
+        continue;
+      }
+
+      $this->matches[] = $field_text;
+
+      if(count($this->matches) > 14){
+        break;
+      }
+    }
+    // dpm($this->matches);
+  }
+
+  /**
+  * getRequestArgs
+  */
+  private function getRequestAutocompleteArgs(){
+    // dpm($this->request);
+    $this->field_name = $this->request->query->get('field_name');
+    $this->keys = $this->request->query->get('q');
+  }
+
   /**
   * searchResults
   */
@@ -85,7 +180,7 @@ class EdlpSearchController extends ControllerBase {
 
     $this->request = $request;
 
-    // TODO: what if no results
+    $this->getRequestSearchArgs();
 
     return $this->getrenderable();
   }
@@ -97,6 +192,8 @@ class EdlpSearchController extends ControllerBase {
 
     $this->request = $request;
 
+    $this->getRequestSearchArgs();
+
     $renderable = $this->getrenderable();
     $rendered = render($renderable);
 
@@ -106,8 +203,6 @@ class EdlpSearchController extends ControllerBase {
       $results_nids[] = $item->id();
     }
 
-    // TODO: what if no results
-
     $response = new JsonResponse();
     $response->setData([
       'test'=>'search results',
@@ -151,11 +246,9 @@ class EdlpSearchController extends ControllerBase {
   */
   private function query(){
 
-    $this->getRequestArgs();
-
     // TODO: get the sapi index id with settings
     /* @var $sapi_index \Drupal\search_api\IndexInterface */
-    $sapi_index = Index::load('collection');
+    $sapi_index = Index::load($this->sapi_index_id);
     // dpm($sapi_index);
 
     // Create the query.
@@ -222,7 +315,8 @@ class EdlpSearchController extends ControllerBase {
   /**
   * getRequestArgs
   */
-  private function getRequestArgs(){
+  private function getRequestSearchArgs(){
+    // dpm($this->request);
     $this->keys = $this->request->query->get('keys');
     $this->entries = $this->request->query->get('entries');
   }

sites/all/modules/figli/edlp_search/src/Form/EdlpSearchForm.php

@@ -32,6 +32,26 @@ class EdlpSearchForm extends FormBase {
       '#weight' => '0',
     ];
 
+    $form['language'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Language'),
+      '#autocomplete_route_name' => 'edlp_search.edlp_search_controller_autocomplete',
+      '#autocomplete_route_parameters' => array('field_name' => 'field_langues'),
+      '#maxlength' => 64,
+      '#size' => 15,
+      '#weight' => '0',
+    ];
+
+    $form['genres'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Genres'),
+      '#autocomplete_route_name' => 'edlp_search.edlp_search_controller_autocomplete',
+      '#autocomplete_route_parameters' => array('field_name' => 'field_genres'),
+      '#maxlength' => 64,
+      '#size' => 15,
+      '#weight' => '0',
+    ];
+
     $this->getEntries();
 
     $form['entries'] = [