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<?php

namespace Common\ServerTiming;

use Closure;
use Common\ServerTiming\ServerTiming;
use Illuminate\Http\Request;
use Illuminate\Support\Str;

class ServerTimingMiddleware
{
    protected mixed $start;

public function __construct(protected ServerTiming $timing)
    {
        $this->start = $this->getRequestStartTime();
    }

public function handle(Request $request, Closure $next)
    {
        $this->timing->setDuration('Bootstrap', $this->getElapsedTimeInMs());

$this->timing->start('App');

$response = $next($request);

$this->timing->stop('App');

$this->timing->stopAllUnfinishedEvents();

$this->timing->setDuration('Total', $this->getElapsedTimeInMs());

$response->headers->set('Server-Timing', $this->generateHeaders());

return $response;
    }

protected function getElapsedTimeInMs(): float|int
    {
        return (microtime(true) - $this->start) * 1000;
    }

protected function getRequestStartTime()
    {
        if (defined('LARAVEL_START')) {
            return LARAVEL_START;
        }
        return $_SERVER['REQUEST_TIME_FLOAT'] ?? microtime(true);
    }

protected function generateHeaders(): string
    {
        $header = '';

foreach ($this->timing->events() as $eventName => $duration) {
            $eventNameSlug = Str::slug($eventName);

$header .= "{$eventNameSlug};desc=\"{$eventName}\";";

if (!is_null($duration)) {
                $header .= "dur={$duration}";
            }

$header .= ', ';
        }

return $header;
    }
}