api for grouping centers, select centers as group in "pick centers" step

for exports

Form/Type/Export/PickCenterType.php

@@ -28,12 +28,14 @@ use Chill\MainBundle\Security\Authorization\AuthorizationHelper;
 use Symfony\Bridge\Doctrine\Form\Type\EntityType;
 use Doctrine\ORM\EntityRepository;
 use Chill\MainBundle\Entity\Center;
+use Chill\MainBundle\Center\GroupingCenterInterface;
+use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
+use Symfony\Component\Form\CallbackTransformer;
+use Doctrine\Common\Collections\Collection;
 
 /**
  * Pick centers amongst available centers for the user
  *
- * @author Julien Fastré <julien.fastre@champs-libres.coop>
- * @author Champs Libres <info@champs-libres.coop>
  */
 class PickCenterType extends AbstractType
 {
@@ -49,6 +51,12 @@ class PickCenterType extends AbstractType
      */
     protected $exportManager;
     
+    /**
+     *
+     * @var GroupingCenterInterface[]
+     */
+    protected $groupingCenters = [];
+    
     const CENTERS_IDENTIFIERS = 'c';
     
     /**
@@ -87,10 +95,87 @@ class PickCenterType extends AbstractType
                 return $qb->where($qb->expr()->in('c.id', $ids));
            }, 
            'multiple' => true,
-           'expanded' => false,
+           'expanded' => true,
            'choice_label' => function(Center $c) { return $c->getName(); },
-           'data' => $centers
+           'data' => count($this->groupingCenters) > 0 ? null : $centers
         ));
+           
+        if (count($this->groupingCenters) > 0) {
+            $groupingBuilder = $builder->create('g', null, [
+                'compound' => true
+            ]);
+
+            foreach ($this->groupingCenters as $key => $gc) {
+                $choices = $this->buildChoices($centers, $gc);
+                
+                if (count($choices) > 0) {
+                    $groupingBuilder->add($key, ChoiceType::class, [
+                        'choices' => $choices,
+                        'multiple' => true,
+                        'expanded' => true,
+                        'label' => $gc->getName()
+                    ]);
+                }
+            }
+            
+            if ($groupingBuilder->count() > 0) {
+                $builder->add($groupingBuilder);
+            }
+        }
         
+        $builder->addModelTransformer(new CallbackTransformer(
+            function($data) use ($centers) { return $this->transform($data, $centers); }, 
+            function($data) use ($centers) { return $this->reverseTransform($data, $centers); }
+            ));
+    }
+    
+    public function addGroupingCenter(GroupingCenterInterface $grouping)
+    {
+        $this->groupingCenters[md5($grouping->getName())] = $grouping;
+    }
+    
+    protected function buildChoices($reachablesCenters, GroupingCenterInterface $gc)
+    {
+        $result = [];
+        
+        foreach ($gc->getGroups() as $group) {
+            foreach ($gc->getCentersForGroup($group) as $center) {
+                if (\in_array($center, $reachablesCenters)) {
+                    $result[$group] = $group;
+                }
+            }
+        }
+        
+        return $result;
+    }
+    
+    protected function transform($data, $centers)
+    {
+        return $data;
+    }
+    
+    protected function reverseTransform($data, $centers)
+    {
+        $picked = $data[self::CENTERS_IDENTIFIERS] 
+            instanceof \Doctrine\Common\Collections\Collection ? 
+                $data[self::CENTERS_IDENTIFIERS]->toArray()
+                :
+                $data[self::CENTERS_IDENTIFIERS];
+        
+        if (\array_key_exists('g', $data)) {
+            foreach($data['g'] as $gcid => $group) {
+                $picked = 
+                    \array_merge(
+                        \array_intersect(
+                            $this->groupingCenters[$gcid] ->getCentersForGroup($group), 
+                            $centers
+                            ),
+                        $picked
+                        )
+                    ;
+            }
+        }
+        
+        return \array_unique($picked);
     }
 }