<?php

declare(strict_types=1);

namespace App\Controller\Booking;

use App\Form\BookingCreateStep1Type;
use App\Service\BookingService;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Attribute\Route;

/**
 * Handles the first step of the booking creation process.
 *
 * This controller manages room selection functionality where users
 * choose the types and quantities of rooms for their booking.
 */
class CreateStep1Controller extends AbstractController
{
    use BookingCreateTrait;
    use BookingExceptionHandlerTrait;

    public function __construct(
        private readonly BookingService $bookingService,
    ) {
    }

    /**
     * Displays and processes the room selection form.
     */
    #[Route('/bookings/create', name: 'app_booking_create_step_1')]
    public function index(Request $request): Response
    {
        $result = $this->getOrCreateBookingCreateDto($this->bookingService, $request);
        if ($result instanceof Response) {
            return $result;
        }
        $bookingCreateDto = $result;

        // Get or create baseline snapshot for change detection
        $oldRoomSelectionSnapshot = $this->bookingService->getOrCreateBaselineSnapshot($request, $bookingCreateDto);

        $summary = $this->bookingService->getRoomSummaryAndParticipantCount($bookingCreateDto);

        // Validate step access - allow step 1 or redirect to current step
        if ($redirect = $this->validateStepAccess($bookingCreateDto, 1)) {
            return $redirect;
        }

        $form = $this->createForm(BookingCreateStep1Type::class, $bookingCreateDto, [
            'validation_groups' => ['booking_create_step_1'],
        ]);

        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
            if ($this->bookingService->hasRoomSelectionChanged($oldRoomSelectionSnapshot, $bookingCreateDto)) {
                $this->bookingService->resetParticipantAssignments($bookingCreateDto);
            }

            $bookingCreateDto->currentStep = 2;
            $this->bookingService->saveBookingCreateDto($request, $bookingCreateDto);

            // Clear baseline snapshot when moving to step 2
            $this->bookingService->clearBaselineSnapshot($request);

            return $this->redirectToRoute('app_booking_create_step_2');
        }

        $availableRooms = $bookingCreateDto->travel->getAvailableRooms();
        $groupedRooms = $this->bookingService->groupRoomsBySelectionType($availableRooms);
        $groupedSelectedRooms = $this->bookingService->groupRoomSelectionsByType($summary['selectedRooms'], $availableRooms);

        return $this->render('booking/create_step_1.html.twig', [
            'bookingCreateDto' => $bookingCreateDto,
            'roomSummary' => $summary['selectedRooms'],
            'participantCount' => $summary['participantCount'],
            'pricingData' => $summary['pricing'],
            'form' => $form->createView(),
            'groupedRooms' => $groupedRooms,
            'groupedSelectedRooms' => $groupedSelectedRooms,
        ]);
    }

    /**
     * HTMX endpoint for live summary updates in step 1.
     */
    #[Route('/bookings/create/room-summary', name: 'app_booking_create_step_1_room_summary', methods: ['POST'])]
    public function roomSummary(Request $request): Response
    {
        $result = $this->getOrCreateBookingCreateDto($this->bookingService, $request);
        if ($result instanceof Response) {
            return $result;
        }
        $bookingCreateDto = $result;

        // Process the form to update the DTO with the latest room selection
        $form = $this->createForm(BookingCreateStep1Type::class, $bookingCreateDto, [
            'validation_groups' => false,
        ]);
        $form->handleRequest($request);

        $summary = $this->bookingService->getRoomSummaryAndParticipantCount($bookingCreateDto);
        $availableRooms = $bookingCreateDto->travel->getAvailableRooms();
        $groupedSelectedRooms = $this->bookingService->groupRoomSelectionsByType($summary['selectedRooms'], $availableRooms);

        return $this->render('booking/_summary.html.twig', [
            'bookingCreateDto' => $bookingCreateDto,
            'roomSummary' => $summary['selectedRooms'],
            'participantCount' => $summary['participantCount'],
            'pricingData' => $summary['pricing'],
            'groupedSelectedRooms' => $groupedSelectedRooms,
        ]);
    }
}