<?php

declare(strict_types=1);

namespace App\BusProNet\DataProcessor;

class PickupPlanningTransformer
{
    /**
     * @param array<int, array<string, mixed>> $payload
     *
     * @return array<string, array<int, array<string, string>>>
     */
    public function transform(array $payload): array
    {
        $result = [];

        foreach ($payload as $item) {
            if ('HIN' !== ($item['PlanungsArt'] ?? null)) {
                continue;
            }

            $travelCodes = $item['Reisecodes'] ?? [];

            if (0 === count($travelCodes)) {
                continue;
            }

            $dateTime = \DateTimeImmutable::createFromFormat('d.m.Y H:i', $item['Zeit'] ?? '');

            foreach ($travelCodes as $code) {
                $pickup = [
                    'city' => $item['Zustieg/Ausstieg Ort'] ?? '',
                    'location' => $item['Zustieg/Ausstieg Strasse'] ?? '',
                    'datetime' => false !== $dateTime ? $dateTime->format('Y-m-d H:i') : '',
                ];

                $key = sprintf('%s|%s|%s', $pickup['city'], $pickup['location'], $pickup['datetime']);

                if (false === isset($result[$code][$key])) {
                    $result[$code][$key] = $pickup;
                }
            }
        }

        foreach ($result as $code => $pickups) {
            $pickups = array_values($pickups);
            usort($pickups, static fn (array $a, array $b): int => $a['datetime'] <=> $b['datetime']);
            $result[$code] = $pickups;
        }

        return $result;
    }
}