<?php
/**
 * Authserver, an OAuth2-based single-signon authentication provider written in PHP.
 *
 * Copyright (C) $today.date  Lars Vierbergen
 *
 * his program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

namespace vierbergenlars\AuthserverExternalAccountBundle\EventListener;


use App\AppEvents;
use App\Event\TemplateEvent;
use Symfony\Bundle\FrameworkBundle\Templating\TemplateReference;
use Symfony\Component\EventDispatcher\EventDispatcherInterface;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
use vierbergenlars\AuthserverExternalAccountBundle\Event\LoginButtonEvent;
use vierbergenlars\AuthserverExternalAccountBundle\ExternalAccount\ExternalAccountProviderManager;
use vierbergenlars\AuthserverExternalAccountBundle\ExternalAccountEvents;

class LoginTemplateEventListener implements EventSubscriberInterface
{

    /**
     *
     * @var ExternalAccountProviderManager
     */
    private $accountProviderManager;

    /**
     *
     * @var UrlGeneratorInterface
     */
    private $urlGenerator;

    public function __construct(ExternalAccountProviderManager $accountProviderManager, UrlGeneratorInterface $urlGenerator)
    {
        $this->accountProviderManager = $accountProviderManager;
        $this->urlGenerator = $urlGenerator;
    }

    public static function getSubscribedEvents()
    {
        return [
            AppEvents::LOGIN_VIEW_BODY => [
                'onLoginViewBody',
                1
            ]
        ];
    }

    public function onLoginViewBody(TemplateEvent $event, $eventName, EventDispatcherInterface $eventDispatcher)
    {
        $loginButtonEvent = new LoginButtonEvent($this->urlGenerator);

        $providers = $this->accountProviderManager->getAccountProviders();
        foreach ($providers as $provider) {
            $loginButtonEvent->addButton($provider->getLoginButton());
        }

        $eventDispatcher->dispatch(ExternalAccountEvents::LOGIN_BUTTON, $loginButtonEvent);

        $buttons = $loginButtonEvent->getButtons();

        if (count($buttons) > 0) {
            $event->setArgument('hiddenPasswordLogin', true);
            $event->addTemplate(new TemplateReference('AuthserverExternalAccountBundle', 'Login', 'buttons', 'html', 'twig'), [
                'buttons' => $buttons
            ]);
        }
    }
}