<?php
declare(strict_types=1);

require_once __DIR__ . '/ReportDataMapper.php';

final class HoursPerClientReport
{
    /** @param list<array<string, mixed>> $entries
     *  @return list<array{client_id:int, client_name:string, hours:float}>
     */
    public function aggregate(array $entries): array
    {
        $totals = [];
        foreach ($entries as $entry) {
            $id = (int)($entry['client_id'] ?? 0);
            $key = (string)$id;
            if (!isset($totals[$key])) {
                $totals[$key] = [
                    'client_id' => $id,
                    'client_name' => (string)($entry['client_name'] ?? ''),
                    'hours' => 0.0,
                ];
            }
            $totals[$key]['hours'] += max(0.0, (float)($entry['hours'] ?? 0));
        }
        $rows = array_values($totals);
        foreach ($rows as &$row) {
            $row['hours'] = round($row['hours'], 2);
        }
        unset($row);
        usort($rows, static fn (array $a, array $b): int => strcmp($a['client_name'], $b['client_name']) ?: $a['client_id'] <=> $b['client_id']);
        return $rows;
    }
}