<?php

declare(strict_types=1);

namespace App\Controller\Booking\Create;

use App\BusProNet\Constants;
use App\Controller\Booking\Traits\BookingCreateTrait;
use App\Controller\Booking\Traits\BookingExceptionHandlerTrait;
use App\Controller\Booking\Traits\ParticipantCardFlowTrait;
use App\Form\BookingCreateStep2Type;
use App\Form\Model\BookingDto;
use App\Form\Service\DummyDataFillService;
use App\Form\Service\ParticipantFieldOptionsProvider;
use App\Htmx\HxTrait;
use App\Service\BookingService;
use App\Service\BookingSummaryDataService;
use App\Service\ParticipantCardDataService;
use App\Service\ParticipantPrepopulationService;
use App\Service\RoomAssignmentService;
use App\Service\TravelDataService;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\Form\FormInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Attribute\Route;

/**
 * Handles the second step of the booking creation process using card-based UI.
 *
 * This controller uses a card overview and lazy-loaded individual participant forms
 * for better performance and UX with large groups (50+ participants).
 */
class Step2Controller extends AbstractController
{
    use BookingCreateTrait;
    use BookingExceptionHandlerTrait;
    use HxTrait;
    use ParticipantCardFlowTrait;

    public function __construct(
        private readonly BookingService $bookingService,
        private readonly BookingSummaryDataService $summaryDataService,
        private readonly TravelDataService $travelDataService,
        private readonly RoomAssignmentService $roomAssignmentService,
        private readonly ParticipantCardDataService $participantCardService,
        private readonly ParticipantFieldOptionsProvider $fieldOptionsProvider,
        private readonly ParticipantPrepopulationService $prepopulationService,
        private readonly DummyDataFillService $dummyDataFillService,
    ) {
    }

    /**
     * Display card grid for all participants.
     */
    #[Route('/bookings/create/participants', name: 'app_booking_create_step_2')]
    public function index(Request $request): Response
    {
        // Load or create booking DTO
        $result = $this->getOrCreateBookingCreateDto($this->bookingService, $request);
        if ($result instanceof Response) {
            return $result;
        }
        $bookingCreateDto = $result;

        // Validate step access
        if ($redirect = $this->validateStepAccess($bookingCreateDto, 2)) {
            return $redirect;
        }

        // Enrich with fresh availability data
        $this->travelDataService->enrichWithFreshAvailabilities($bookingCreateDto->travel);

        // Ensure correct number of participants with prepopulation callback
        $this->bookingService->ensureCorrectNumberOfParticipants(
            $bookingCreateDto,
            $this->getUser(),
            fn ($user, $participant) => $this->prepopulationService->prepopulateApplicantFromUser($user, $participant)
        );

        // Validate room assignments against current selection (handles back-navigation from step 2 to step 1)
        $this->roomAssignmentService->validateAndResetInvalidAssignments($bookingCreateDto);

        // Auto-assign rooms if needed
        $this->roomAssignmentService->assignRoomsIfNeeded($bookingCreateDto);

        // Preselect mandatory services
        $this->bookingService->preselectMandatoryServices($bookingCreateDto);

        // Save BookingDto to session
        $this->bookingService->saveBookingDto($request, $bookingCreateDto, BookingDto::MODE_CREATE);

        // Create validation form
        $form = $this->createForm(BookingCreateStep2Type::class, $bookingCreateDto);
        $form->handleRequest($request);

        // Handle form submission
        if (true === $form->isSubmitted() && true === $form->isValid()) {
            // All participants validated successfully, update current step
            $bookingCreateDto->currentStep = 3;
            $this->bookingService->saveBookingDto($request, $bookingCreateDto, BookingDto::MODE_CREATE);

            // Proceed to Step 3
            return $this->redirectToRoute('app_booking_create_step_3');
        }

        // Always generate card data with validation state to show completeness
        $cardsData = $this->participantCardService->getAllCardsDataWithValidation($bookingCreateDto);

        // Get complete summary data (pricing, rooms, CMS data)
        $summaryData = $this->summaryDataService->getSummaryData($bookingCreateDto);

        $templateData = [
            'form' => $form->createView(),
            'bookingDto' => $bookingCreateDto,
            'cardsData' => $cardsData,
            'summaryData' => $summaryData,
            'isSubmitted' => $form->isSubmitted(),
        ];

        return $this->render('booking/create/step_2.html.twig', $templateData);
    }

    /**
     * Show or submit individual participant form.
     */
    #[Route(
        path: '/bookings/create/participants/{index}',
        name: 'app_booking_create_step_2_participant',
        requirements: ['index' => '\d+']
    )]
    public function editParticipant(int $index, Request $request): Response
    {
        $result = $this->loadBookingDtoOrRedirect($request, BookingDto::MODE_CREATE);
        if ($result instanceof Response) {
            return $result;
        }
        $bookingDto = $result;

        // Validate participant index
        if (false === isset($bookingDto->participants[$index])) {
            throw $this->createNotFoundException(sprintf('Participant at index %d does not exist', $index));
        }

        // Use cached availability data (populated during booking init)
        $this->travelDataService->enrichWithFreshAvailabilities($bookingDto->travel);

        // Create form with booking_context option
        $form = $this->createParticipantForm($bookingDto, $index);

        $form->handleRequest($request);

        // Detect dummy data fill token — render pre-filled form immediately, skipping validation
        $isDummyDataFill = $this
            ->dummyDataFillService
            ->isTokenMatch($bookingDto->participants[$index], $bookingDto->getMode())
        ;
        if (true === $form->isSubmitted() && true === $isDummyDataFill) {
            $this->dummyDataFillService->fill($bookingDto->participants[$index], $index);
            $bookingDto->bookingStatus = Constants::BOOKING_STATUS_OPEN;
            $this->bookingService->saveBookingDto($request, $bookingDto, BookingDto::MODE_CREATE);

            // Recreate form with filled DTO so the view shows the dummy data
            $form = $this->createParticipantForm($bookingDto, $index);

            return $this->renderParticipantForm($form, $index, $bookingDto);
        }

        // Collect notifications from field handlers (run during PRE_SUBMIT)
        $notifications = $this->collectAndClearNotifications($bookingDto);

        if (true === $form->isSubmitted() && true === $form->isValid()) {
            // Save BookingDto to session
            $this->bookingService->saveBookingDto($request, $bookingDto, BookingDto::MODE_CREATE);

            // Add notifications as flash messages (redirects destroy HTMX-triggered toasts)
            $this->addNotificationsAsFlashMessages($notifications);

            // HTMX redirect to cards view
            return $this->redirectToRoute('app_booking_create_step_2');
        }

        return $this->renderParticipantForm($form, $index, $bookingDto);
    }

    /**
     * HTMX refresh endpoint for individual participant form.
     */
    #[Route(
        path: '/bookings/create/participants/{index}/refresh',
        name: 'app_booking_create_step_2_participant_refresh',
        requirements: ['index' => '\d+'],
        methods: ['POST']
    )]
    public function refreshParticipantForm(int $index, Request $request): Response
    {
        $result = $this->loadBookingDtoOrRedirect($request, BookingDto::MODE_CREATE);
        if ($result instanceof Response) {
            return $result;
        }
        $bookingDto = $result;

        // Validate participant index
        if (false === isset($bookingDto->participants[$index])) {
            throw $this->createNotFoundException(sprintf('Participant at index %d does not exist', $index));
        }

        // Enrich with fresh availability data
        $this->travelDataService->enrichWithFreshAvailabilities($bookingDto->travel);

        // Use trait method for refresh handling
        return $this->handleParticipantRefresh(
            $request,
            $bookingDto,
            $index,
            'app_booking_create_step_2_participant_refresh'
        );
    }

    private function renderParticipantForm(
        FormInterface $form,
        int $index,
        BookingDto $bookingDto,
    ): Response {
        return $this->render('booking/create/step_2_participant.html.twig', [
            'form' => $form->createView(),
            'participantIndex' => $index,
            'bookingDto' => $bookingDto,
            'summaryData' => $this->summaryDataService->getSummaryData($bookingDto),
            'refreshRouteName' => 'app_booking_create_step_2_participant_refresh',
        ]);
    }
}