<?php

declare(strict_types=1);

namespace App\Form\Service;

use App\BusProNet\Constants;
use App\BusProNet\Model\Service;
use App\Form\Model\BookingDto;
use App\Form\Service\Abstract\AbstractParticipantFieldHandler;

/**
 * Handles processing of the rentalInsurance field for booking participants.
 *
 * This handler manages rental insurance selections for participants in the booking
 * creation process. It processes the rentalInsurance field from form submissions,
 * validates the selection, and updates the participant DTO with the valid selection.
 *
 * The rental insurance field is only shown when the participant has selected both
 * a skipass and rental services, creating a dependency chain where rental insurance
 * depends on skipass and rental selections.
 *
 * Dependencies: dateOfBirth (for age evaluation), skiPass (for visibility), and rentals (for field visibility)
 */
class ParticipantRentalInsuranceFieldHandler extends AbstractParticipantFieldHandler
{
    /**
     * Returns the form field name this handler processes.
     *
     * @return string The field name 'rentalInsurance'
     */
    public function getFieldName(): string
    {
        return 'rentalInsurance';
    }

    /**
     * Returns the field dependencies for proper processing order.
     *
     * This handler depends on dateOfBirth (for age evaluation), skiPass (for field visibility),
     * and rentals (because rental insurance is only relevant when rentals are selected).
     *
     * @return string[] Array containing 'dateOfBirth', 'skiPass', and 'rentals' dependencies
     */
    public function getDependencies(): array
    {
        return ['dateOfBirth', 'skiPass', 'rentals'];
    }

    /**
     * Determines if this handler should process the field based on submitted data.
     *
     * For service selection fields like rental insurance, we always need to process
     * to handle cases where the selection is cleared (field not present in data).
     * This ensures the participant DTO is updated with null when no
     * rental insurance is selected.
     *
     * @param array<string, mixed> $submittedData    The submitted participant form data
     * @param int                  $participantIndex The index of the participant being processed
     *
     * @return bool Always returns true for service selection fields
     */
    public function shouldProcess(array $submittedData, int $participantIndex): bool
    {
        return true; // Always process to handle deselection cases
    }

    /**
     * Processes the rentalInsurance field for a specific participant.
     *
     * This method extracts the rental insurance selection from submitted form data,
     * validates the selection against the participant's age constraints, and
     * updates the participant DTO with the valid selection. If the rental insurance
     * is no longer appropriate for the participant's age, it is automatically cleared.
     *
     * @param array<string, mixed> $submittedData    The submitted participant form data
     * @param BookingDto  $bookingDto       The booking DTO to update (create or edit)
     * @param int                  $participantIndex The index of the participant being processed
     */
    public function processField(array $submittedData, BookingDto $bookingDto, int $participantIndex): void
    {
        // Safely get the participant object, returning early if not found
        $participant = $this->getParticipant($bookingDto, $participantIndex);
        if (null === $participant) {
            return;
        }

        // Check if rental insurance should be visible based on skipass and rental selections
        $hasSkiPass = null !== $participant->skiPass;
        $hasRentals = false === empty($participant->rentals);

        if (false === $hasSkiPass || false === $hasRentals) {
            // If no skipass or no rentals are selected, clear rental insurance data
            $participant->rentalInsuranceSelected = false;
            $participant->rentalInsurance = null;

            return;
        }

        // Extract checkbox value from submitted data (this comes from the rentalInsuranceSelected property)
        $rentalInsuranceSelected = $this->getFieldValue($submittedData, $this->getFieldName());
        $isRentalInsuranceSelected = (bool) $rentalInsuranceSelected;

        // Store boolean value
        $participant->rentalInsuranceSelected = $isRentalInsuranceSelected;

        // Store service object based on checkbox state for pricing calculations
        if (true === $isRentalInsuranceSelected) {
            $participant->rentalInsurance = $this->findRentalInsuranceService($bookingDto);
        } else {
            $participant->rentalInsurance = null;
        }
    }

    /**
     * Finds the rental insurance service from available services.
     *
     * Gets the first (and typically only) rental insurance service.
     * Returns null if no rental insurance services are available.
     *
     * @param BookingDto $bookingDto The booking DTO containing travel data
     *
     * @return Service|null The rental insurance service object, or null if not found
     */
    private function findRentalInsuranceService(BookingDto $bookingDto): ?Service
    {
        $rentalInsuranceServices = $bookingDto->travel->getAdditionalServicesBySubTypes(Constants::TOKEN_RENTAL_INSURANCE, true, true);

        if (empty($rentalInsuranceServices)) {
            return null;
        }

        return reset($rentalInsuranceServices); // Get the first (and typically only) rental insurance service
    }
}