create max holder validator

src/Bundle/ChillPersonBundle/Validator/Constraints/Household/MaxHolderValidator.php

@@ -2,7 +2,46 @@
 
 namespace Chill\PersonBundle\Validator\Constraints\Household;
 
-class MaxHolderValidator
+use Chill\MainBundle\Util\DateRangeCovering;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\Validator\Exception\UnexpectedTypeException;
+use Symfony\Component\Validator\Exception\UnexpectedValueException;
+
+class MaxHolderValidator extends ConstraintValidator
 {
-    
+    private const MAX_HOLDERS = 2;
+
+    public function validate($household, Constraint $constraint)
+    {
+        $holders = $household->getMembersHolder();
+
+        if ($holders->count() <= self::MAX_HOLDERS) {
+            return;
+        }
+
+        $covers = new DateRangeCovering(self::MAX_HOLDERS,
+            $holders[0]->getStartDate()->getTimezone());
+
+        foreach ($holders as $key => $member) {
+            $covers->add($member->getStartDate(), $member->getEndDate(), $key);
+        }
+
+        $covers->compute();
+
+        if ($covers->hasIntersections()) {
+            foreach ($covers->getIntersections() as list($start, $end, $ids)) {
+                $msg = $end === null ? $constraint->messageEndInfinite : 
+                    $constraint->message;
+
+                $this->context->buildViolation($msg)
+                    ->setParameters([
+                        'start' => $start->format('d-m-Y'), // TODO fix when MessageParameter works with timezone
+                        'end' => $end === null ? null : $end->format('d-m-Y')
+                    ])
+                    ->addViolation();
+            }
+        }
+
+    }
 }