<?php

declare(strict_types=1);

namespace App\Controller\Booking\Edit;

use App\BusProNet\ApiClient;
use App\BusProNet\Exception\ApiClientException;
use App\BusProNet\Exception\TimeoutException;
use App\BusProNet\Model\Notification;
use App\Controller\Booking\Traits;
use App\Controller\Booking\Traits\BookingExceptionHandlerTrait;
use App\Entity\User;
use App\Form\BookingEditType;
use App\Form\BookingParticipantType;
use App\Form\Model\BookingDto;
use App\Form\Model\ParticipantEditDto;
use App\Htmx\HxTrait;
use App\Security\Crypt;
use App\Service\BookingEditDataLoaderService;
use App\Service\BookingFingerprintService;
use App\Service\BookingService;
use App\Service\BookingSummaryDataService;
use App\Service\ParticipantCardDataService;
use App\Service\TravelDataService;
use Psr\Log\LoggerInterface;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Attribute\Route;
use Symfony\Component\Security\Http\Attribute\IsGranted;

/**
 * Edit controller using card-based participant interface.
 *
 * This controller implements the card-based UI for editing existing bookings:
 * - Card overview with lazy-loaded individual participant forms
 * - Handles canceled participants (status 'S')
 * - Applies mutability constraints via EditFieldStateProvider
 * - Final submission calls ApiClient::updateBooking()
 */
class IndexController extends AbstractController
{
    use BookingExceptionHandlerTrait;
    use HxTrait;
    use Traits\ParticipantCardFlowTrait;

    public function __construct(
        private readonly ApiClient $apiClient,
        private readonly BookingEditDataLoaderService $dataLoader,
        private readonly TravelDataService $travelDataService,
        private readonly BookingService $bookingService,
        private readonly BookingFingerprintService $fingerprintService,
        private readonly BookingSummaryDataService $summaryDataService,
        private readonly ParticipantCardDataService $participantCardService,
        private readonly Crypt $crypt,
        private readonly LoggerInterface $logger,
    ) {
    }

    /**
     * Display participant cards overview.
     */
    #[Route('/bookings/{id}/edit', name: 'app_booking_edit', requirements: ['id' => '\d+'])]
    #[IsGranted('ROLE_USER')]
    public function index(int $id, Request $request): Response
    {
        /** @var User $user */
        $user = $this->getUser();
        $email = $user->getEmail();
        $password = $this->crypt->decrypt($user->getPassword());

        // Load form data from session (or API on first load)
        $bookingDto = $this->dataLoader->loadFormData($request, $id, $email, $password);

        if (null === $bookingDto) {
            $this->addFlash('error', 'Buchungsdaten nicht (mehr) verfügbar');

            return $this->redirectToRoute('app_bookings');
        }

        // Fetch booking data for display (surcharges, canceled status, etc.)
        $bookingData = $this->dataLoader->fetchBookingData($email, $password, $id);
        if (null === $bookingData || $bookingData instanceof Notification) {
            $this->addFlash('error', 'Buchungsdaten nicht (mehr) verfügbar');

            return $this->redirectToRoute('app_bookings');
        }

        // Fetch mutable data for form constraints
        $mutableData = $this->travelDataService->getMutabilityData($bookingData->dateId);

        // Create validation form (same pattern as CreateStep2Controller)
        $form = $this->createForm(BookingEditType::class, $bookingDto);
        $form->handleRequest($request);

        // Handle form submission (clicking "Buchung aktualisieren")
        if ($form->isSubmitted() && $form->isValid()) {
            return $this->handleFormSubmission($request, $bookingDto, $id, $email);
        }

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

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

        $templateData = [
            'form' => $form->createView(),
            'bookingDto' => $bookingDto,
            'bookingData' => $bookingData,
            'mutableData' => $mutableData,
            'cardsData' => $cardsData,
            'summaryData' => $summaryData,
            'isDirty' => $this->fingerprintService->isDirty($bookingDto),
            'isSubmitted' => $form->isSubmitted(),
            'hasValidationErrors' => $form->isSubmitted() && false === $form->isValid(),
        ];

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

    /**
     * Edit single participant form.
     */
    #[Route(
        path: '/bookings/{id}/edit/participants/{index}',
        name: 'app_booking_edit_participant',
        requirements: ['id' => '\d+', 'index' => '\d+']
    )]
    #[IsGranted('ROLE_USER')]
    public function editParticipant(int $id, int $index, Request $request): Response
    {
        /** @var User $user */
        $user = $this->getUser();
        $email = $user->getEmail();
        $password = $this->crypt->decrypt($user->getPassword());

        // Load form data from session
        $bookingDto = $this->bookingService->getBookingDto($request, BookingDto::MODE_EDIT);

        if (null === $bookingDto) {
            $this->addFlash('error', 'Sitzung abgelaufen. Bitte neu laden.');

            return $this->redirectToRoute('app_booking_edit', ['id' => $id]);
        }

        $participant = $bookingDto->participants[$index] ?? null;

        if (null === $participant) {
            throw new \InvalidArgumentException('Invalid participant index');
        }

        // Fetch booking data to check for canceled status
        $bookingData = $this->dataLoader->fetchBookingData($email, $password, $id);
        if (null === $bookingData || $bookingData instanceof Notification) {
            $this->addFlash('error', 'Buchungsdaten nicht (mehr) verfügbar');

            return $this->redirectToRoute('app_bookings');
        }

        // Check if participant is canceled
        $isCanceled = 'S' === ($bookingData->participantsStatus[$index] ?? null);

        if ($isCanceled) {
            $this->addFlash('warning', 'Stornierte Teilnehmer können nicht bearbeitet werden');

            return $this->redirectToRoute('app_booking_edit', ['id' => $id]);
        }

        // Fetch fresh availabilities when entering participant form
        // This ensures up-to-date data and populates cache for subsequent HTMX refreshes
        $this->travelDataService->enrichWithFreshAvailabilities($bookingDto->travel, cached: false);

        // Create wrapper DTO for email uniqueness validation
        $wrapper = new ParticipantEditDto(
            participant: $participant,
            bookingContext: $bookingDto,
        );

        // Create form for participant with booking context
        $form = $this->createForm(BookingParticipantType::class, $wrapper, [
            'booking_context' => $bookingDto,
            'height_choices' => $this->getParameter('body_dimensions.height_choices'),
            'weight_choices' => $this->getParameter('body_dimensions.weight_choices'),
            'shoe_size_min' => $this->getParameter('body_dimensions.shoe_size_min'),
            'shoe_size_max' => $this->getParameter('body_dimensions.shoe_size_max'),
        ]);

        $form->handleRequest($request);

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

        if ($form->isSubmitted() && $form->isValid()) {
            // Save updated booking data to session
            $this->bookingService->saveBookingDto($request, $bookingDto, BookingDto::MODE_EDIT);

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

            // Redirect back to cards
            return $this->redirectToRoute('app_booking_edit', ['id' => $id]);
        }

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

        // Fetch mutable data for form constraints
        $mutableData = $this->travelDataService->getMutabilityData($bookingData->dateId);

        $templateData = [
            'form' => $form->createView(),
            'participantIndex' => $index,
            'bookingDto' => $bookingDto,
            'bookingData' => $bookingData,
            'mutableData' => $mutableData,
            'summaryData' => $summaryData,
            'refreshRouteName' => 'app_booking_edit_participant_refresh',
            'refreshRouteParams' => ['id' => $id, 'index' => $index],
            'cancelRouteName' => 'app_booking_edit',
            'cancelRouteParams' => ['id' => $id],
        ];

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

    /**
     * HTMX endpoint for refreshing participant form without validation.
     */
    #[Route(
        path: '/bookings/{id}/edit/participants/{index}/refresh',
        name: 'app_booking_edit_participant_refresh',
        requirements: ['id' => '\d+', 'index' => '\d+'],
        methods: ['POST']
    )]
    #[IsGranted('ROLE_USER')]
    public function refreshParticipantForm(int $id, int $index, Request $request): Response
    {
        /** @var User $user */
        $user = $this->getUser();
        $email = $user->getEmail();
        $password = $this->crypt->decrypt($user->getPassword());

        // Load form data from session
        $bookingDto = $this->bookingService->getBookingDto($request, BookingDto::MODE_EDIT);

        if (null === $bookingDto) {
            return new Response('Session expired. Please reload page.', Response::HTTP_BAD_REQUEST);
        }

        // Refresh availability data
        $this->travelDataService->enrichWithFreshAvailabilities($bookingDto->travel);

        // Fetch booking data and mutable data
        $bookingData = $this->dataLoader->fetchBookingData($email, $password, $id);
        $mutableData = null !== $bookingData && !($bookingData instanceof Notification)
            ? $this->travelDataService->getMutabilityData($bookingData->dateId)
            : null;

        // Create wrapper DTO for form
        $wrapper = new ParticipantEditDto(
            participant: $bookingDto->participants[$index],
            bookingContext: $bookingDto,
        );

        // Create form with validation disabled
        $form = $this->createForm(BookingParticipantType::class, $wrapper, [
            'booking_context' => $bookingDto,
            'validation_groups' => false,
            'height_choices' => $this->getParameter('body_dimensions.height_choices'),
            'weight_choices' => $this->getParameter('body_dimensions.weight_choices'),
            'shoe_size_min' => $this->getParameter('body_dimensions.shoe_size_min'),
            'shoe_size_max' => $this->getParameter('body_dimensions.shoe_size_max'),
        ]);

        $form->handleRequest($request);

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

        // Save updated booking data to session
        $this->bookingService->saveBookingDto($request, $bookingDto, BookingDto::MODE_EDIT);

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

        // Render form + sidebar using htmxOobResponse
        $response = $this->htmxOobResponse(
            'booking/_participant_form.html.twig',
            ['participant_form', 'booking_summary'],
            [
                'form' => $form,
                'participantIndex' => $index,
                'bookingDto' => $bookingDto,
                'bookingData' => $bookingData,
                'mutableData' => $mutableData,
                'summaryData' => $summaryData,
                'refreshRouteName' => 'app_booking_edit_participant_refresh',
                'refreshRouteParams' => ['id' => $id, 'index' => $index],
                'cancelRouteName' => 'app_booking_edit',
                'cancelRouteParams' => ['id' => $id],
            ]
        );

        // Add notifications to HX-Trigger header if present
        if (false === empty($notifications)) {
            $response->headers->set('HX-Trigger', json_encode([
                'showNotifications' => $notifications,
            ]));
        }

        return $response;
    }

    /**
     * Reloads booking data from API, discarding all session changes.
     *
     * GET: Returns modal HTML for confirmation
     * POST: Clears session and redirects to reload the booking
     */
    #[Route(
        path: '/bookings/{id}/edit/reload',
        name: 'app_booking_edit_reload',
        requirements: ['id' => '\d+']
    )]
    #[IsGranted('ROLE_USER')]
    public function reloadFromApi(int $id, Request $request): Response
    {
        if (Request::METHOD_POST === $request->getMethod()) {
            // Clear session to discard all changes
            $this->bookingService->clearBookingDto($request, BookingDto::MODE_EDIT);

            $this->addFlash('success', 'Änderungen verworfen, Daten neu geladen');

            return $this->redirectToRoute('app_booking_edit', ['id' => $id]);
        }

        return $this->render('booking/edit/modal_reload.html.twig', [
            'bookingId' => $id,
        ]);
    }

    /**
     * Handles "Zurück" button - shows confirmation modal or clears session.
     *
     * GET: Returns modal HTML for confirmation
     * POST: Clears session and redirects to bookings list
     */
    #[Route(
        path: '/bookings/{id}/edit/cancel',
        name: 'app_booking_edit_cancel',
        requirements: ['id' => '\d+']
    )]
    #[IsGranted('ROLE_USER')]
    public function cancelEdit(int $id, Request $request): Response
    {
        if (Request::METHOD_POST === $request->getMethod()) {
            // Clear session to discard dirty state
            $this->bookingService->clearBookingDto($request, BookingDto::MODE_EDIT);

            return $this->redirectToRoute('app_bookings');
        }

        return $this->render('booking/edit/modal_cancel.html.twig', [
            'bookingId' => $id,
        ]);
    }

    /**
     * Handles form submission for booking update.
     */
    private function handleFormSubmission(Request $request, BookingDto $bookingDto, int $id, string $email): Response
    {
        $this->logger->info('Initiated booking update', [
            'email' => $email,
            'booking_id' => $id,
        ]);

        try {
            $response = $this->apiClient->updateBooking($bookingDto, true);
            if ($response instanceof Notification) {
                if (true === $response->isError()) {
                    $this->addFlash('error', $response->message);
                } else {
                    $this->addFlash('info', $response->message);
                }
                $this->logger->error('Booking update not successful', [
                    'email' => $email,
                    'booking_id' => $id,
                    'message' => $response->message,
                ]);
            } else {
                // Invalidate cache and clear session on success
                $this->dataLoader->invalidateBookingCache($id);
                $this->bookingService->clearBookingDto($request, BookingDto::MODE_EDIT);

                $this->addFlash('success', 'Buchung erfolgreich aktualisiert');
                $this->logger->info('Booking update successful', [
                    'email' => $email,
                    'booking_id' => $id,
                ]);

                return $this->redirectToRoute('app_booking_edit', ['id' => $id]);
            }
        } catch (TimeoutException $e) {
            $this->addFlash('error', 'Die Anfrage hat zu lange gedauert. Bitte versuchen Sie es erneut.');
            $this->logger->error('Booking update timeout', [
                'email' => $email,
                'booking_id' => $id,
                'exception' => $e->getMessage(),
            ]);
        } catch (ApiClientException) {
            $this->addFlash('error', 'Es ist ein Fehler in der Kommunikation mit dem Buchungssystem aufgetreten');
        }

        return $this->redirectToRoute('app_booking_edit', ['id' => $id]);
    }
}