<?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 Registration\Event\RegistrationHandleEvent;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Registration\RegistrationEvents;
use Registration\Event\RegistrationFormEvent;
use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
use vierbergenlars\AuthserverExternalAccountBundle\Entity\TemporaryUser;
use Doctrine\ORM\EntityManagerInterface;

class RegistrationHandlerListener implements EventSubscriberInterface
{

    /**
     *
     * @var TokenStorageInterface
     */
    private $tokenStorage;

    /**
     *
     * @var EntityManagerInterface
     */
    private $em;

    public static function getSubscribedEvents()
    {
        return [
            RegistrationEvents::BUILD_FORM => [
                [
                    'onBuildFormSetPasswordEnabled',
                    10
                ],
                [
                    'onBuildFormRemovePasswordField',
                    -20
                ]
            ],
            RegistrationEvents::HANDLE_FORM => [
                [
                    'onHandleFormConnectExternal',
                    0
                ],
                [
                    'onHandleFormLogoutExternal',
                    -250
                ]
            ]
        ];
    }

    public function __construct(EntityManagerInterface $em, TokenStorageInterface $tokenStorage)
    {
        $this->em = $em;
        $this->tokenStorage = $tokenStorage;
    }

    private function getTemporaryUser()
    {
        $token = $this->tokenStorage->getToken();
        if (!$token)
            return null;
        $user = $token->getUser();
        if ($user instanceof TemporaryUser)
            return $user;
        return null;
    }

    public function onBuildFormSetPasswordEnabled(RegistrationFormEvent $event)
    {
        if ($user = $this->getTemporaryUser()) {
            $event->getFormBuilder()
                ->getData()
                ->setDisplayName($user->getDisplayName())
                ->setPasswordEnabled(2);
        }
    }

    public function onBuildFormRemovePasswordField(RegistrationFormEvent $event)
    {
        if ($this->getTemporaryUser()) {
            switch ($event->getFormBuilder()
                ->getData()
                ->getPasswordEnabled()) {
                case 0:
                case 2:
                    $event->getFormBuilder()->remove('password');
                    break;
                case 1:
                    break;
            }
        }
    }

    public function onHandleFormConnectExternal(RegistrationHandleEvent $event)
    {
        if ($event->isFailed())
            return;
        $user = $event->getForm()->getData();
        if (!$user)
            return;
        /* @var $user User */
        if ($temporaryUser = $this->getTemporaryUser()) {
            $temporaryUser->getExternalUser()->setUser($user);
            $this->em->persist($temporaryUser->getExternalUser());
        }
    }

    public function onHandleFormLogoutExternal(RegistrationHandleEvent $event)
    {
        if ($event->isFailed())
            return;
        if ($this->getTemporaryUser())
            $this->tokenStorage->setToken(null);
    }
}