<?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;

/**
 * Validates promotional voucher codes against the BPN API.
 *
 * Verifies that promo codes are valid for the current travel, checks minimum price
 * thresholds, and validates code availability. Uses the participant's calculated
 * total price (including room and all selected services) for threshold comparison.
 */
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();
        }
    }
}