wip: incorrect rules around family insurances

addresses #869dr80qj

src/Form/Service/Condition/FamilyInsuranceActiveCondition.php

@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Form\Service\Condition;
+
+use App\Form\Model\BookingDto;
+use App\Form\Service\Contract\FieldConditionInterface;
+
+/**
+ * True for dependent participants when the applicant has a family insurance selected.
+ *
+ * Family insurance covers the whole family under a single policy on the applicant, so
+ * dependents must not be offered their own insurance selection while it's active.
+ */
+class FamilyInsuranceActiveCondition implements FieldConditionInterface
+{
+    public function evaluate(BookingDto $bookingDto, int $participantIndex, array $formData): bool
+    {
+        if (0 === $participantIndex) {
+            return false;
+        }
+
+        $applicant = $bookingDto->getParticipant(0);
+
+        return null !== $applicant
+            && null !== $applicant->insurance
+            && true === $applicant->insurance->familyInsurance;
+    }
+
+    public function getDependentFields(): array
+    {
+        return ['insurance'];
+    }
+
+    public function getDescription(): string
+    {
+        return 'Applicant has a family insurance selected';
+    }
+}