<?php

namespace App\Services\Rooms;

use App\Models\Room;

class RoomStatisticsService
{
    /**
     * @return array{average: string|null, median: string|null}|null
     */
    public function currentRound(Room $room): ?array
    {
        if ($room->revealed_at === null) {
            return null;
        }

        $values = [];

        foreach ($room->players as $player) {
            $vote = $player->votes->first();

            if ($vote !== null && is_numeric($vote->value)) {
                $values[] = (float) $vote->value;
            }
        }

        sort($values, SORT_NUMERIC);
        $count = count($values);

        if ($count === 0) {
            return ['average' => null, 'median' => null];
        }

        $middle = intdiv($count, 2);
        $median = $count % 2 === 1
            ? $values[$middle]
            : ($values[$middle - 1] + $values[$middle]) / 2;

        return [
            'average' => number_format(array_sum($values) / $count, 2, ',', ''),
            'median' => number_format($median, 2, ',', ''),
        ];
    }
}