<?php

declare(strict_types=1);

namespace App\Form\Service;

use App\Form\Model\BookingDto;
use App\Form\Service\Abstract\AbstractParticipantFieldHandler;
use App\Service\BookingPriceCalculator;
use App\Service\VoucherValidator;

/**
 * Handles promotional voucher code field processing.
 *
 * Validates promo codes via API and stores the validated voucher data
 * for early discount display. Validation is also performed by the
 * PromoVoucher constraint on ParticipantEditDto for form error feedback.
 *
 * Dependencies: ALL price-affecting fields (insurance, services, ski pass, rentals, etc.)
 * since promo validation requires accurate participant pricing.
 */
class ParticipantPromoVoucherFieldHandler extends AbstractParticipantFieldHandler
{
    public function __construct(
        private readonly VoucherValidator $voucherValidationService,
        private readonly BookingPriceCalculator $priceCalculatorService,
    ) {
    }

    public function getFieldName(): string
    {
        return 'promoVoucherCode';
    }

    public function getDependencies(): array
    {
        // CRITICAL: Must run after ALL price-affecting handlers to ensure accurate pricing
        return [
            'dateOfBirth',              // Required for age-based services
            'skiPass',                  // Affects travel price
            'rentals',                  // Affects travel price
            'courses',                  // Affects travel price
            'additionalServices',       // Affects travel price
            'board',                    // Affects travel price
            'transportationOutbound',   // Affects travel price
            'transportationInbound',    // Affects travel price
            'pickup',                   // Affects travel price
            'parking',                  // Affects travel price
            'insurance',                // Affects travel price (must be last)
        ];
    }

    public function shouldProcess(array $submittedData, string $mode, int $participantIndex): bool
    {
        $promoCode = $this->getFieldValue($submittedData, $this->getFieldName());

        return null !== $promoCode && '' !== trim($promoCode);
    }

    public function processField(array $submittedData, BookingDto $bookingDto, int $participantIndex): void
    {
        $participant = $this->getParticipant($bookingDto, $participantIndex);

        if (null === $participant) {
            return;
        }

        $promoCode = $this->getFieldValue($submittedData, $this->getFieldName());

        // Clear validated voucher if code is empty
        if (null === $promoCode || '' === trim($promoCode)) {
            $participant->validatedPromoVoucher = null;

            return;
        }

        // Calculate participant price for validation
        $participantPrice = $this->priceCalculatorService->calculateIndividualParticipantPrice(
            $bookingDto,
            $participantIndex
        );

        // Validate promo voucher and store result
        $result = $this->voucherValidationService->validatePromoVoucher(
            trim($promoCode),
            $bookingDto->travel->id,
            $participantPrice
        );

        // Store validated voucher (null if invalid)
        $participant->validatedPromoVoucher = $result->isValid ? $result->voucher : null;
    }
}