<?php

declare(strict_types=1);

namespace App\Controller\Booking\Create;

use App\BusProNet\XmlLoader\AgencyLoader;
use App\Controller\Account\PersonalDataController;
use App\Entity\User;
use App\Exception\HotelNotFoundException;
use App\Exception\HotelNotInTravelException;
use App\Exception\NoRoomsAvailableException;
use App\Exception\TravelNotFoundException;
use App\Htmx\HxTrait;
use App\Model\BookingQueryParams;
use App\Service\BookingService;
use App\Service\BookingSummaryDataService;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpKernel\Attribute\MapQueryString;
use Symfony\Component\Routing\Attribute\Route;

/**
 * Handles the initialization of new booking sessions.
 *
 * This controller provides a clean entry point for starting new booking flows
 * without requiring random UID parameters. It creates fresh booking sessions
 * and redirects to the first step of the booking process.
 */
class IndexController extends AbstractController
{
    use HxTrait;

    public function __construct(
        private readonly BookingService $bookingService,
        private readonly AgencyLoader $agencyLoader,
        private readonly BookingSummaryDataService $summaryDataService,
    ) {
    }

    /**
     * Entry point for starting a new booking.
     *
     * Renders a loading page that triggers the actual initialization via HTMX.
     * This provides immediate visual feedback while BusProNet API calls are made.
     * Redirects to profile completion if logged-in user has incomplete profile data.
     */
    #[Route(
        path: '/bookings/create',
        name: 'app_booking_create',
    )]
    public function index(Request $request, #[MapQueryString] ?BookingQueryParams $params): Response
    {
        if (null === $params) {
            throw $this->createNotFoundException('Invalid booking parameters provided');
        }

        $user = $this->getUser();

        if ($user instanceof User && false === $user->isProfileComplete()) {
            $request->getSession()->set(PersonalDataController::SESSION_REDIRECT_KEY, $request->getUri());

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

        return $this->render('booking/create/index.html.twig', [
            'params' => $params,
        ]);
    }

    /**
     * Initializes a fresh booking session and redirects to the login page.
     *
     * This endpoint is triggered via HTMX from the loading page. It clears any
     * existing booking session, creates a fresh BookingDto, and redirects to
     * the login page where users can authenticate or continue as guest.
     *
     * Optionally accepts an agency code parameter. If provided and valid, the
     * corresponding agency ID is stored in the booking. If not provided or invalid,
     * defaults to agency code '0001'.
     */
    #[Route(
        path: '/bookings/create/init',
        name: 'app_booking_create_init',
    )]
    public function init(Request $request, #[MapQueryString] ?BookingQueryParams $params): Response
    {
        if (null === $params) {
            return $this->htmxRedirect($request, $this->generateUrl('app_booking_create_error'));
        }

        $dateId = $params->dateId;
        $hotelId = $params->hotelId;

        try {
            // Clear any existing booking session to ensure fresh start
            $this->bookingService->clearBookingSession($request);

            // Determine agency ID from optional query parameter
            $agencyId = $this->resolveAgencyId($params->agency);

            // Store optional return URL in session (defaults to main EP site)
            $this->bookingService->storeReturnUrl($request, $params->returnUrl);

            // Create fresh booking session with the provided parameters
            $bookingDto = $this->bookingService->startFreshBooking($request, $dateId, $hotelId, $agencyId);

            // Warm the CMS cache early so data is available on the login page
            $this->summaryDataService->getCmsDataForProduct(
                $bookingDto->travel->productCode,
                $bookingDto->travel->hotel?->code
            );

            // Redirect to login page (optional authentication before Step 1)
            return $this->htmxRedirect($request, $this->generateUrl('app_login'));
        } catch (TravelNotFoundException|HotelNotFoundException|HotelNotInTravelException|NoRoomsAvailableException $e) {
            $this->addFlash('error', $e->getMessage());

            return $this->htmxRedirect($request, $this->generateUrl('app_booking_create_error'));
        }
    }

    /**
     * Resolves the agency ID from the provided agency code.
     *
     * If the code is null or the agency is not found, returns the default agency ID.
     *
     * @param string|null $agencyCode The agency code from the request parameter
     *
     * @return int|null The agency ID, or null if default agency not found
     */
    private function resolveAgencyId(?string $agencyCode): ?int
    {
        // Use default agency if no code provided
        if (null === $agencyCode || '' === trim($agencyCode)) {
            $defaultAgency = $this->agencyLoader->loadDefault();

            return $defaultAgency?->id;
        }

        // Try to find agency by provided code
        $agency = $this->agencyLoader->loadByCode($agencyCode);

        // Fall back to default agency if code not found
        if (null === $agency) {
            $defaultAgency = $this->agencyLoader->loadDefault();

            return $defaultAgency?->id;
        }

        return $agency->id;
    }

    /**
     * Cancels the active booking session and returns to the appropriate page.
     *
     * This endpoint allows users to exit the booking flow at any time by
     * clearing the booking session data and redirecting them appropriately:
     * - Logged-in users: redirected to account dashboard
     * - Guest users: redirected to the return URL (stored during booking init)
     */
    #[Route('/bookings/cancel', name: 'app_booking_cancel')]
    public function cancel(Request $request): Response
    {
        if (Request::METHOD_POST === $request->getMethod()) {
            // Get return URL before clearing session (for guest users)
            $returnUrl = $this->bookingService->getReturnUrl($request);

            // Clear the booking session
            $this->bookingService->clearBookingSession($request);

            // Clear the security target path to prevent redirect loop after login
            // Without this, logging in after cancel would redirect back to a stale booking URL
            $request->getSession()->remove('_security.main.target_path');

            // Redirect to account dashboard if logged in, otherwise to return URL
            // Use htmxRedirect to ensure full page navigation so flash messages are displayed
            if (null !== $this->getUser()) {
                $this->addFlash('info', 'Buchung abgebrochen.');

                return $this->htmxRedirect($request, $this->generateUrl('app_account'));
            }

            // Use htmxRedirect for cross-origin safety (returnUrl may be external)
            return $this->htmxRedirect($request, $returnUrl);
        }

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

    /**
     * Displays user-friendly error messages for booking initialization failures.
     *
     * This endpoint provides a centralized location for displaying booking errors
     * with appropriate error messages and guidance for users.
     */
    #[Route('/bookings/create/error', name: 'app_booking_create_error')]
    public function error(Request $request): Response
    {
        return $this->render('booking/create/error.html.twig', [
            'returnUrl' => $this->bookingService->getReturnUrl($request),
        ]);
    }
}