feat: improved promotional and purchase vouchers

src/Validator/Constraints/PromoVoucherValidator.php

@@ -0,0 +1,71 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Validator\Constraints;
+
+use App\Form\Model\ParticipantEditDto;
+use App\Service\BookingPriceCalculatorService;
+use App\Service\VoucherValidationService;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\Validator\Exception\UnexpectedTypeException;
+
+class PromoVoucherValidator extends ConstraintValidator
+{
+    public function __construct(
+        private readonly VoucherValidationService $voucherValidationService,
+        private readonly BookingPriceCalculatorService $priceCalculatorService,
+    ) {
+    }
+
+    public function validate(mixed $value, Constraint $constraint): void
+    {
+        if (!$constraint instanceof PromoVoucher) {
+            throw new UnexpectedTypeException($constraint, PromoVoucher::class);
+        }
+
+        if (!$value instanceof ParticipantEditDto) {
+            throw new UnexpectedTypeException($value, ParticipantEditDto::class);
+        }
+
+        $promoCode = $value->participant->promoVoucherCode;
+
+        // Skip validation if promo code is empty
+        if (null === $promoCode || '' === trim($promoCode)) {
+            return;
+        }
+
+        // Get travel ID from booking context
+        $travelId = $value->bookingContext->travel->id;
+
+        if (null === $travelId) {
+            $this->context->buildViolation('Aktionscode konnte nicht validiert werden: Reise-ID fehlt.')
+                ->atPath('participant.promoVoucherCode')
+                ->addViolation();
+
+            return;
+        }
+
+        // Calculate participant's current price including all services
+        $participantPrice = $this->priceCalculatorService->calculateIndividualParticipantPrice(
+            $value->bookingContext,
+            $value->participant->index ?? 0
+        );
+
+        // Validate promo voucher via API
+        $result = $this->voucherValidationService->validatePromoVoucher(
+            $promoCode,
+            $travelId,
+            $participantPrice
+        );
+
+        // Add violation if voucher is invalid
+        if (false === $result->isValid) {
+            $this->context->buildViolation($constraint->message)
+                ->setParameter('{{ error }}', $result->errorMessage ?? 'Unbekannter Fehler')
+                ->atPath('participant.promoVoucherCode')
+                ->addViolation();
+        }
+    }
+}