<?php

namespace App\EventSubscriber;

use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\HttpFoundation\RequestStack;
use Symfony\Component\Security\Http\SecurityEvents;
use Symfony\Component\HttpKernel\Event\RequestEvent;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\Security\Http\Event\InteractiveLoginEvent;
use Symfony\Component\DependencyInjection\ParameterBag\ParameterBagInterface;

class LocaleSubscriber implements EventSubscriberInterface
{
    private $defaultLocale;
    private $requestStack;

    public function __construct(RequestStack $requestStack, ParameterBagInterface $params)
    {
        $this->defaultLocale = $params->get('kernel.default_locale');
        $this->requestStack = $requestStack;
    }

    public function onKernelRequest(RequestEvent $event)
    {
        $request = $event->getRequest();
        if (!$request->hasPreviousSession()) {
            return;
        }

        $request->setLocale($request->getSession()->get('_locale', $this->defaultLocale));
    }

    public function onInteractiveLogin(InteractiveLoginEvent $event)
    {
        /**
         * @var user $user
         */
        $user = $event->getAuthenticationToken()->getUser();

        if (null !== $user->getLocale()) {
            $this->requestStack->getSession()->set('_locale', $user->getLocale());
        }
    }


    public static function getSubscribedEvents()
    {
        return [
            KernelEvents::REQUEST => [['onKernelRequest', 20]],
            SecurityEvents::INTERACTIVE_LOGIN => 'onInteractiveLogin',
        ];
    }
}