<?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\Model\ParticipantDto;
use App\Form\Service\Abstract\AbstractParticipantFieldHandler;

/**
 * Handles processing of the board field for booking participants.
 *
 * This handler manages board/meal option selections for participants in the booking
 * creation process. It processes the board field from form submissions,
 * filters out age-inappropriate options, and updates the participant DTO with only
 * valid selections.
 *
 * Dependencies: dateOfBirth (must be processed first for age evaluation)
 */
class ParticipantBoardFieldHandler extends AbstractParticipantFieldHandler
{
    public function getFieldName(): string
    {
        return 'board';
    }

    public function getDependencies(): array
    {
        return ['dateOfBirth'];
    }

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

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

        if (false === $participant instanceof ParticipantDto) {
            return;
        }

        $selectedBoard = $this->getFieldValue($submittedData, $this->getFieldName()) ?? [];

        // Get available board options from travel data (includes booked options in edit mode)
        $availableBoard = $this->getAvailableServicesWithBooked(
            $bookingDto,
            $participantIndex,
            Constants::TOKEN_BOARD
        );

        $validSelections = $this->filterValidServiceSelections(
            $selectedBoard,
            $availableBoard,
            $bookingDto,
            $participantIndex
        );

        $this->updateAutoBookOptOutBoard(
            $participant,
            $availableBoard,
            $validSelections,
            $bookingDto,
            $participantIndex
        );

        $participant->board = $validSelections;
    }

    private function updateAutoBookOptOutBoard(
        ParticipantDto $participant,
        array $availableBoard,
        array $validSelections,
        BookingDto $bookingDto,
        int $participantIndex,
    ): void {
        $currentlySelectedAutoBookIds = [];
        foreach ($participant->board as $selectedService) {
            if (false === $selectedService instanceof Service) {
                continue;
            }

            if (null === $selectedService->id || true === $selectedService->mandatory || false === $selectedService->autoBook) {
                continue;
            }

            if (false === $this->isServiceValidForParticipant($selectedService, $availableBoard, $bookingDto, $participantIndex)) {
                continue;
            }

            $currentlySelectedAutoBookIds[] = $selectedService->id;
        }

        $newlySelectedAutoBookIds = [];
        foreach ($validSelections as $selectedService) {
            if (null === $selectedService->id || true === $selectedService->mandatory || false === $selectedService->autoBook) {
                continue;
            }

            $newlySelectedAutoBookIds[] = $selectedService->id;
        }

        foreach ($currentlySelectedAutoBookIds as $serviceId) {
            if (false === in_array($serviceId, $newlySelectedAutoBookIds, true)
                && false === in_array($serviceId, $participant->autoBookOptOutBoardIds, true)) {
                $participant->autoBookOptOutBoardIds[] = $serviceId;
            }
        }

        $participant->autoBookOptOutBoardIds = array_values(array_filter(
            $participant->autoBookOptOutBoardIds,
            static fn (int $serviceId): bool => false === in_array($serviceId, $newlySelectedAutoBookIds, true)
        ));
    }

    private function filterValidServiceSelections(
        array $selectedServices,
        array $availableServices,
        BookingDto $bookingDto,
        int $participantIndex,
    ): array {
        $validSelections = [];

        foreach ($selectedServices as $selectedService) {
            if ($this->isServiceValidForParticipant($selectedService, $availableServices, $bookingDto, $participantIndex)) {
                // Convert the selected service ID/data back to the actual Service object
                $serviceObject = $this->findServiceInAvailableServices($selectedService, $availableServices);
                if (null !== $serviceObject) {
                    $validSelections[] = $serviceObject;
                }
            }
        }

        return $validSelections;
    }

    private function isServiceValidForParticipant(
        mixed $selectedService,
        array $availableServices,
        BookingDto $bookingDto,
        int $participantIndex,
    ): bool {
        $service = $this->findServiceInAvailableServices($selectedService, $availableServices);

        if (null === $service) {
            return false;
        }

        $ageEvaluator = new ServiceAgeEvaluator();
        if (false === $ageEvaluator->canEvaluate($service)) {
            return true;
        }

        return $ageEvaluator->isServiceAvailableForParticipant($service, $bookingDto, $participantIndex);
    }
}