<?php

namespace App\Controller;
use Cake\Routing\Router;
use Cake\Utility\Security;
use Facebook\Exceptions\FacebookSDKException;
use Facebook\Facebook;

class LoginFacebookController extends AppController
{
    public $autoRender = false;
    public $layout = false;
    private $appID = '1941518196096276';
    private $appSecret = 'cf188c4dca7061a86709c17e4d3a4a19';
    private $fbObject;

    public function initialize()
    {
        parent::initialize();
        $this->request->session()->start();
        $this->fbObject = new Facebook(
            [
                'app_id' => $this->appID,
                'app_secret' => $this->appSecret,
                'default_graph_version' => 'v2.5',
            ]
        );
        $this->Auth->allow(['auth', 'callback']);
    }
    public function auth()
    {
        $helper = $this->fbObject->getRedirectLoginHelper();
        $permissions = ['email'];
        $loginUrl = $helper->getLoginUrl(
            Router::url(['action' => 'callback'], true),
            $permissions
        );
        $this->redirect($loginUrl);
    }

    public function callback()
    {
        $helper = $this->fbObject->getRedirectLoginHelper();
        try
        {
            $accessToken = $helper->getAccessToken();
            $response = $this->fbObject->get('/me?fields=id,name,first_name,last_name,email', $accessToken);
            $fb_user = $response->getGraphUser();
            debug($fb_user); exit();
            $this->loadModel('Users');
            $user = $this->Users->findByEmail($fb_user['email'])->first();
            if(empty($user))
            {
                $password = Security::hash(time(), 'sha1', true);
                $data = [
                    'email' => $fb_user['email'],
                    'password' => $password,
                    'fname' => $fb_user['first_name'],
                    'lname' => $fb_user['last_name']
                ];
                $user = $this->Users->newEntity($data);
                $this->Users->save($user);
                $this->Auth->setUser($data);
                unset($data['password']);
                $this->redirect($this->Auth->redirectUrl());
            }else{
                $data = [
                    'email' => $fb_user['email'],
                    'fname' => $fb_user['first_name']
                ];
                $this->Auth->setUser($data);
                $this->request->session()->delete("Auth.User.password");
                $this->redirect($this->Auth->redirectUrl());
            }
        }
        catch (FacebookSDKException $e)
        {
            throw new FacebookSDKException( sprintf("No access Token: %s", $e->getMessage()));
        }
    }
}