<?php

declare(strict_types=1);

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;
use Symfony\Component\HttpFoundation\Response;

/**
 * Negligible-overhead request duration header for production HTTP profiling.
 * Does not log queries or payloads.
 */
final class AddServerTiming
{
    public function handle(Request $request, Closure $next): Response
    {
        $started = hrtime(true);
        $response = $next($request);
        $durationMs = (hrtime(true) - $started) / 1_000_000;

        if (headers_sent()) {
            return $response;
        }

        $metrics = ['app;desc="Laravel";dur='.number_format($durationMs, 1, '.', '')];
        $ssrMs = $request->attributes->get('http.ssr_ms');
        if (is_numeric($ssrMs) && (float) $ssrMs >= 0) {
            $metrics[] = 'ssr;desc="Inertia SSR";dur='.number_format((float) $ssrMs, 1, '.', '');
        }

        $metric = implode(', ', $metrics);
        $existing = $response->headers->get('Server-Timing');

        $response->headers->set(
            'Server-Timing',
            $existing ? $existing.', '.$metric : $metric,
        );

        return $response;
    }
}