<?php

namespace App\Service;

use App\BusProNet\Model\Room;
use App\Form\Model\BookingCreateDto;
use App\Form\Model\RoomSelectionDto;
use App\Service\TravelDataService;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;

class BookingService
{
    public function __construct(
        private readonly TravelDataService $travelDataService,
    ) {
    }

    public function getOrCreateBookingCreateDto(Request $request): BookingCreateDto
    {
        $bookingUuid = $request->query->get('uid');
        $bookingCreateDto = $request->getSession()->get('booking_create');

        // No UID parameter - return existing DTO from session if available
        if (null === $bookingUuid && null !== $bookingCreateDto) {
            return $bookingCreateDto;
        }

        // Create a new DTO - we need date_id and hotel_id for this
        $dateId = $request->query->getInt('date_id');
        $hotelId = $request->query->getInt('hotel_id');

        if (0 === $dateId || 0 === $hotelId) {
            throw new NotFoundHttpException('Missing date_id or hotel_id parameters');
        }

        $travelData = $this->travelDataService->getTravelData($dateId, $hotelId);
        if (null === $travelData) {
            throw new NotFoundHttpException(sprintf('Travel data not found for date ID %d and hotel ID %d', $dateId, $hotelId));
        }
        $roomsIdsAndQuantities = $this->processRoomQuantities($request);
        $availableRooms = $travelData->getAvailableRooms();

        $roomSelections = array_map(
            fn (Room $room) => $this->createRoomSelection($room, $roomsIdsAndQuantities),
            $availableRooms
        );

        $bookingCreateDto = new BookingCreateDto($travelData, $hotelId);
        $bookingCreateDto->roomSelections = $roomSelections;

        $this->saveBookingCreateDto($request, $bookingCreateDto);

        return $bookingCreateDto;
    }

    public function saveBookingCreateDto(Request $request, BookingCreateDto $bookingCreateDto): void
    {
        $request->getSession()->set('booking_create', $bookingCreateDto);
    }

    private function createRoomSelection(Room $room, array $roomsIdsAndQuantities): RoomSelectionDto
    {
        $selection = new RoomSelectionDto();
        $selection->roomId = $room->id;
        $selection->roomLabel = $room->label;
        $selection->maxQuantity = $room->available;
        $selection->minPax = $room->minPax;
        $selection->quantity = $roomsIdsAndQuantities[$room->id] ?? 0;

        return $selection;
    }

    /**
     * Extracts room IDs and quantities from the request data.
     *
     * Processes the 'rooms' parameter from the request to extract room IDs
     * as keys and their corresponding quantities as integer values. Filters
     * out empty values and converts all quantities to integers.
     *
     * @param Request $request The HTTP request containing room data
     *
     * @return array<int, int> Array with room IDs as keys and quantities as values
     */
    public function processRoomQuantities(Request $request): array
    {
        $rooms = $request->request->all('rooms');

        return array_map('intval', array_filter($rooms, 'strlen'));
    }
}