<?php

declare(strict_types=1);

namespace App\BusProNet\DataProcessor;

use App\Form\Model\BookingDto;
use App\Form\Model\ParticipantDto;

/**
 * Collects service-to-participant mappings for BusProNet API payloads.
 *
 * Extracts and groups participant service selections into structured maps
 * keyed by service ID with arrays of participant IDs (1-based for API).
 */
class ServiceMappingCollector
{
    /**
     * Collects room mappings.
     *
     * Groups participants by their assigned room ID.
     *
     * @return array<string, array<int>> Map of room ID to participant IDs
     */
    public function collectRoomMappings(BookingDto $bookingDto): array
    {
        $roomMap = [];

        foreach ($bookingDto->participants as $index => $participant) {
            $participantId = $index + 1;

            if (null !== $participant->assignedRoomId) {
                $roomMap[$participant->assignedRoomId][] = $participantId;
            }
        }

        return $roomMap;
    }

    /**
     * Collects service mappings for the booking request.
     *
     * Groups board, ski passes, rentals, rental insurance, courses, parking, and additional services
     * by service ID with their participant assignments (1-based).
     *
     * @return array<string, array<int>> Map of service ID to participant IDs
     */
    public function collectServiceMappings(BookingDto $bookingDto): array
    {
        $serviceMap = [];

        foreach ($bookingDto->participants as $index => $participant) {
            $participantId = $index + 1;

            // Board services
            foreach ($participant->board as $board) {
                $serviceMap[$board->id][] = $participantId;
            }

            // Ski pass
            if (null !== $participant->skiPass) {
                $serviceMap[$participant->skiPass->id][] = $participantId;
            }

            // Rentals
            foreach ($participant->rentals as $rental) {
                $serviceMap[$rental->id][] = $participantId;
            }

            // Rental insurance
            if (null !== $participant->rentalInsurance) {
                $serviceMap[$participant->rentalInsurance->id][] = $participantId;
            }

            // Courses
            foreach ($participant->courses as $course) {
                $serviceMap[$course->id][] = $participantId;
            }

            // Parking service (for self-organized transportation)
            if (true === $participant->parking && null !== $participant->parkingService) {
                $serviceMap[$participant->parkingService->id][] = $participantId;
            }

            // Additional services
            foreach ($participant->additionalServices as $service) {
                $serviceMap[$service->id][] = $participantId;
            }
        }

        return $serviceMap;
    }

    /**
     * Collects transportation service mappings.
     *
     * @return array<string, array<int>> Map of transportation service ID to participant IDs
     */
    public function collectTransportationMappings(BookingDto $bookingDto): array
    {
        $transportationMap = [];

        foreach ($bookingDto->participants as $index => $participant) {
            $participantId = $index + 1;

            if (null !== $participant->transportationOutbound) {
                $transportationMap[$participant->transportationOutbound->id][] = $participantId;
            }

            if (null !== $participant->transportationInbound) {
                $transportationMap[$participant->transportationInbound->id][] = $participantId;
            }
        }

        return $transportationMap;
    }

    /**
     * Collects pickup location mappings.
     *
     * Collects the unified pickup selection which applies to both directions.
     * The API receives this as outbound pickup data.
     *
     * @return array<string, array<int>> Map of pickup ID to participant IDs
     */
    public function collectPickupMappings(BookingDto $bookingDto): array
    {
        $pickupMap = [];

        foreach ($bookingDto->participants as $index => $participant) {
            $participantId = $index + 1;

            if (null !== $participant->pickup) {
                $pickupMap[$participant->pickup->id][] = $participantId;
            }
        }

        return $pickupMap;
    }

    /**
     * Collects insurance mappings.
     *
     * CRITICAL: Insurance data is only included in CREATE flow, not in UPDATE flow.
     * IMPORTANT: Excludes synthetic "no insurance" option from BPN transmission.
     *
     * @return array<string, array<int>> Map of insurance ID to participant IDs
     */
    public function collectInsuranceMappings(BookingDto $bookingDto): array
    {
        $insuranceMap = [];

        foreach ($bookingDto->participants as $index => $participant) {
            $participantId = $index + 1;

            // Exclude synthetic "keine Versicherung gewünscht" option from BPN XML
            if (null !== $participant->insurance && false === $participant->insurance->isNoInsurance()) {
                $insuranceMap[$participant->insurance->id][] = $participantId;
            }
        }

        return $insuranceMap;
    }

    /**
     * Collects all purchase vouchers from participants.
     *
     * Removes duplicates and empty values, returning unique redemption codes
     * for aggregation into the <gutscheine> collection in the booking payload.
     *
     * IMPORTANT: Goodwill vouchers (Kulanz) are excluded from this collection.
     * They are added per participant as <aktionscode> instead.
     *
     * @return string[] Array of unique redemption codes (excluding Kulanz)
     */
    public function collectPurchaseVouchers(BookingDto $bookingDto): array
    {
        $vouchers = [];

        foreach ($bookingDto->participants as $participant) {
            if (null !== $participant->purchaseVoucherCode && '' !== trim($participant->purchaseVoucherCode)) {
                // Exclude goodwill vouchers
                if (false === $participant->hasGoodwillVoucher()) {
                    $vouchers[] = trim($participant->purchaseVoucherCode);
                }
            }
        }

        // Remove duplicates (in case multiple participants enter same code)
        return array_unique($vouchers);
    }

    /**
     * Gets the aktionscode (promotional voucher code) for a participant.
     *
     * Returns the promotional voucher code if present.
     * Goodwill vouchers are handled separately via getGoodwillVoucherCodeForParticipant().
     *
     * @return string|null The aktionscode to use, or null if none
     */
    public function getPromoVoucherCodeForParticipant(ParticipantDto $participant): ?string
    {
        // Only return promotional voucher code (goodwill vouchers are handled separately)
        if (null !== $participant->promoVoucherCode && '' !== trim($participant->promoVoucherCode)) {
            return trim($participant->promoVoucherCode);
        }

        return null;
    }

    /**
     * Extracts goodwill voucher code for a participant.
     *
     * Goodwill vouchers are sent as <einloesecode> per participant (not in aggregate),
     * allowing them to coexist with promotional codes.
     */
    public function getGoodwillVoucherCodeForParticipant(ParticipantDto $participant): ?string
    {
        if ($participant->hasGoodwillVoucher() && null !== $participant->purchaseVoucherCode && '' !== trim($participant->purchaseVoucherCode)) {
            return trim($participant->purchaseVoucherCode);
        }

        return null;
    }
}