<?php

declare(strict_types=1);

namespace App\Service;

use App\Form\Model\BookingDto;
use App\Form\Model\BookingSummaryDto;
use Psr\Log\LoggerInterface;
use Symfony\Contracts\Cache\CacheInterface;
use Symfony\Contracts\Cache\ItemInterface;

/**
 * Consolidates all booking summary data for display in sidebars.
 *
 * Provides pricing breakdowns, room assignments, participant counts,
 * and CMS product information in a single service.
 */
class BookingSummaryDataService
{
    public function __construct(
        private readonly BookingPriceCalculatorService $priceCalculator,
        private readonly CmsDataService $cmsDataService,
        private readonly CacheInterface $cache,
        private readonly LoggerInterface $logger,
    ) {
    }

    /**
     * Get complete summary data for booking sidebar.
     */
    public function getSummaryData(BookingDto $bookingDto): BookingSummaryDto
    {
        // Get selected rooms (for Step1 controller compatibility)
        $selectedRooms = $bookingDto->getSelectedRooms();

        // Calculate individual prices for all participants
        $participantPrices = $this->priceCalculator->calculateAllParticipantIndividualPrices($bookingDto);

        // Calculate total price
        $totalPrice = array_sum($participantPrices);

        // Get room assignment counts
        $roomCounts = [];
        foreach ($bookingDto->participants as $participant) {
            if (null !== $participant->assignedRoomId) {
                $roomCounts[$participant->assignedRoomId] = ($roomCounts[$participant->assignedRoomId] ?? 0) + 1;
            }
        }

        // Group selected rooms with counts (for display)
        $groupedSelectedRooms = [];
        foreach ($roomCounts as $roomId => $count) {
            $room = $bookingDto->travel->getRoomById($roomId);
            if (null !== $room) {
                $groupedSelectedRooms[] = [
                    'room' => $room,
                    'count' => $count,
                ];
            }
        }

        // Get detailed pricing breakdown
        $pricingData = $this->priceCalculator->getPricingBreakdown($bookingDto);

        // Fetch CMS data (images, etc.)
        $cmsData = $this->getCmsData($bookingDto);

        // Calculate participant count from room capacity (source of truth)
        $participantCount = $this->calculateParticipantCountFromRooms($bookingDto);

        // Calculate payable amount after voucher deductions
        $payableAmount = $this->calculatePayableAmount($bookingDto, $pricingData['grandTotal'], $participantPrices);

        return new BookingSummaryDto(
            selectedRooms: $selectedRooms,
            participantCount: $participantCount,
            totalPrice: $pricingData['grandTotal'],
            payableAmount: $payableAmount,
            groupedSelectedRooms: $groupedSelectedRooms,
            assignmentCounts: $roomCounts,
            pricingData: $pricingData,
            cmsData: $cmsData,
        );
    }

    /**
     * Calculates the payable amount after voucher deductions.
     *
     * @param array<int, float> $participantPrices Prices per participant for percentage voucher calculation
     */
    private function calculatePayableAmount(BookingDto $bookingDto, float $grandTotal, array $participantPrices): float
    {
        $acceptedVouchers = $bookingDto->getAcceptedVouchers($participantPrices);

        if (null === $acceptedVouchers) {
            return $grandTotal;
        }

        return max(0.0, $grandTotal - $acceptedVouchers->getTotalDiscount());
    }

    /**
     * Calculates participant count.
     *
     * In edit mode, counts actual participants. In create mode, calculates
     * from room selections by multiplying quantity by maximum capacity (maxPax).
     */
    private function calculateParticipantCountFromRooms(BookingDto $bookingDto): int
    {
        // In edit mode, use actual participant count
        if (BookingDto::MODE_EDIT === $bookingDto->getMode()) {
            return count($bookingDto->participants);
        }

        // In create mode, calculate from room selections
        $totalCapacity = 0;
        $availableRooms = $bookingDto->travel->getAvailableRooms();

        foreach ($bookingDto->roomSelections as $selection) {
            if ($selection->quantity > 0 && isset($availableRooms[$selection->roomId])) {
                $room = $availableRooms[$selection->roomId];
                $totalCapacity += $selection->quantity * ($room->maxPax ?? 0);
            }
        }

        return $totalCapacity;
    }

    /**
     * Fetches CMS data for a product and hotel combination.
     *
     * Data is cached for 1 hour as it rarely changes. Returns null
     * if the API call fails or if product code is not available.
     * This method can be called early in the booking flow to warm the cache.
     */
    public function getCmsDataForProduct(?string $productCode, ?string $hotelCode): ?array
    {
        if (null === $productCode) {
            return null;
        }

        $cacheKey = sprintf('cms_data.%s.%s', $productCode, $hotelCode ?? 'none');

        try {
            return $this->cache->get($cacheKey, function (ItemInterface $item) use ($productCode, $hotelCode) {
                $item->expiresAfter(3600); // 1 hour

                $result = $this->cmsDataService->getProductDetails($productCode, $hotelCode);

                // Return null if API call failed
                if (true === isset($result['success']) && false === $result['success']) {
                    $this->logger->warning('CMS API call failed', [
                        'product_code' => $productCode,
                        'hotel_code' => $hotelCode,
                        'message' => $result['message'] ?? 'Unknown error',
                    ]);

                    return null;
                }

                return $result;
            });
        } catch (\Throwable $e) {
            $this->logger->error('Failed to fetch CMS data', [
                'product_code' => $productCode,
                'hotel_code' => $hotelCode,
                'exception' => $e->getMessage(),
            ]);

            return null;
        }
    }

    /**
     * Fetches CMS data for the product and hotel in the booking.
     */
    private function getCmsData(BookingDto $bookingDto): ?array
    {
        $productCode = $bookingDto->travel->productCode;
        $hotelCode = $bookingDto->travel->hotel?->code;

        if (null === $productCode) {
            $this->logger->debug('Cannot fetch CMS data: product code is not available', [
                'travel_id' => $bookingDto->travel->id,
            ]);

            return null;
        }

        return $this->getCmsDataForProduct($productCode, $hotelCode);
    }
}