keuangan/app/Http/Middleware/HandlePreferredLanguage.php

<?php

namespace App\Http\Middleware;

use App\Domains\Identity\Enums\UserSettingKey;
use App\Domains\System\Enums\SystemSettingKey;
use App\Domains\System\Queries\GetSystemSettings;
use Closure;
use Illuminate\Http\Request;
use Symfony\Component\HttpFoundation\Response;
use Throwable;

class HandlePreferredLanguage
{
    public function __construct(protected GetSystemSettings $getSystemSettings) {}

    /**
     * Handle an incoming request.
     *
     * @param  Closure(Request): (Response)  $next
     *
     * @throws Throwable
     */
    public function handle(Request $request, Closure $next): Response
    {
        if (session()->has('locale')) {
            $lang = session()->get('locale');
        } else {
            $lang = $this->getSystemSettings->get(SystemSettingKey::DEFAULT_LANGUAGE);
            $userSetting = $request->user()?->settings;

            if ($userSetting !== null && isset($userSetting[UserSettingKey::LANGUAGE->value])) {
                $lang = $userSetting[UserSettingKey::LANGUAGE->value];
            }
        }

        setlocale(LC_ALL, $lang);
        app()->setLocale($lang);

        return $next($request);
    }
}