<?php

// start session
session_start();

if( isset($_GET['sair']) ){
  session_start();
  session_destroy();
  header("Location: index.php");

}

// include required files form Facebook SDK

require_once( 'Facebook/HttpClients/FacebookHttpable.php' );
require_once( 'Facebook/HttpClients/FacebookCurl.php' );
require_once( 'Facebook/HttpClients/FacebookCurlHttpClient.php' );

require_once( 'Facebook/Entities/AccessToken.php' );
require_once( 'Facebook/Entities/SignedRequest.php' );

require_once( 'Facebook/FacebookSession.php' );
require_once( 'Facebook/FacebookRedirectLoginHelper.php' );
require_once( 'Facebook/FacebookRequest.php' );
require_once( 'Facebook/FacebookResponse.php' );
require_once( 'Facebook/FacebookSDKException.php' );
require_once( 'Facebook/FacebookRequestException.php' );
require_once( 'Facebook/FacebookOtherException.php' );
require_once( 'Facebook/FacebookAuthorizationException.php' );
require_once( 'Facebook/GraphObject.php' );
require_once( 'Facebook/GraphSessionInfo.php' );

use Facebook\HttpClients\FacebookHttpable;
use Facebook\HttpClients\FacebookCurl;
use Facebook\HttpClients\FacebookCurlHttpClient;

use Facebook\Entities\AccessToken;
use Facebook\Entities\SignedRequest;

use Facebook\FacebookSession;
use Facebook\FacebookRedirectLoginHelper;
use Facebook\FacebookRequest;
use Facebook\FacebookResponse;
use Facebook\FacebookSDKException;
use Facebook\FacebookRequestException;
use Facebook\FacebookOtherException;
use Facebook\FacebookAuthorizationException;
use Facebook\GraphObject;
use Facebook\GraphSessionInfo;



$page_id    = "xxxxxxxxxxxxxx";
$page_name  = 'xxxxxxxxxxxxxx';
$app_id     = "xxxxxxxxxxxxxx";
$app_secret = "xxxxxxxxxxxxxx";

// init app with app id and secret






FacebookSession::setDefaultApplication( 'xxxxxxxxxxx','xxxxxxxxxxxxxxxxxxxxxxxxxx' );

// login helper with redirect_uri
$helper = new FacebookRedirectLoginHelper( 'http://www.website.com.br/app/fb-sdk/index.php' );

// see if a existing session exists
if ( isset( $_SESSION ) && isset( $_SESSION['fb_token'] ) ) {
  // create new session from saved access_token
  $session = new FacebookSession( $_SESSION['fb_token'] );

  // validate the access_token to make sure it's still valid
  try {
    if ( !$session->validate() ) {
      $session = null;
    }
  } catch ( Exception $e ) {
    // catch any exceptions
    $session = null;
  }
}

if ( !isset( $session ) || $session === null ) {
  // no session exists

  try {
    $session = $helper->getSessionFromRedirect();
  } catch( FacebookRequestException $ex ) {
    // When Facebook returns an error
    // handle this better in production code
    print_r( $ex );
  } catch( Exception $ex ) {
    // When validation fails or other local issues
    // handle this better in production code
    print_r( $ex );
  }

}

// see if we have a session
if ( isset( $session ) ) {

  // save the session
  $_SESSION['fb_token'] = $session->getToken();
  // create a session using saved token or the new one we generated at login
  $session = new FacebookSession( $session->getToken() );

  // graph api request for user data
  $request = new FacebookRequest( $session, 'GET', '/me/feed' );
  $response = $request->execute();
  // get response
  $graphObject = $response->getGraphObject()->asArray();


  /***************************************/
  // post to page



  $page_post = (new FacebookRequest( $session, 'POST', '/'. $page_id .'/feed', array(
    //'access_token' => $_SESSION['fb_token'],
    'name' => '(#'.rand(99,99999999).')Facebook API: Posting As A Page using Graph API v2.x and PHP SDK 4.0.x',
    'link' => 'https://www.webniraj.com/2014/08/23/facebook-api-posting-as-a-page-using-graph-api-v2-x-and-php-sdk-4-0-x/',
    'caption' => 'The Facebook API lets you post to Pages you administrate via the API. This tutorial shows you how to achieve this using the Facebook PHP SDK v4.0.x and Graph API 2.x.',
    'message' => 'Check out my new blog post!',
  ) ))->execute()->getGraphObject()->asArray();

// return post_id
print_r( $page_post );

echo "<pre>$RESPONSE";
print_r( $response );
echo "</pre>";
  /***************************************/

  // print profile data
  echo '<pre>' . print_r( $graphObject, 1 ) . '</pre>';

  // print logout url using session and redirect_uri (logout.php page should destroy the session)
  echo '<a href="' . $helper->getLogoutUrl( $session, 'http://www.website.com.br/app/fb-sdk/index.php?sair=true' ) . '">Logout</a>';

} else {
  // show login url
  echo '<a href="' . $helper->getLoginUrl(
              array(
                      'email',
                      'user_friends',
                      'manage_pages', 'publish_actions',
                      "scope" => "publish_stream, manage_pages, publish_actions"
                    )
                ) . '">Login</a>';
}