session_start();

date_default_timezone_set('Europe/Paris');

define('FACEBOOK_SDK_V4_SRC_DIR', '/fb-php-sdk-v4/src/Facebook/');
require __DIR__ . '/facebook-php-sdk-v4/autoload.php';

require_once( __DIR__ . '/facebook-php-sdk-v4/src/Facebook/FacebookSession.php' );
require_once( __DIR__ . '/facebook-php-sdk-v4/src/Facebook/FacebookRedirectLoginHelper.php' );
require_once( __DIR__ . '/facebook-php-sdk-v4/src/Facebook/FacebookRequest.php' );
require_once( __DIR__ . '/facebook-php-sdk-v4/src/Facebook/FacebookResponse.php' );
require_once( __DIR__ . '/facebook-php-sdk-v4/src/Facebook/FacebookSDKException.php' );
require_once( __DIR__ . '/facebook-php-sdk-v4/src/Facebook/FacebookRequestException.php' );
require_once( __DIR__ . '/facebook-php-sdk-v4/src/Facebook/FacebookAuthorizationException.php' );
require_once( __DIR__ . '/facebook-php-sdk-v4/src/Facebook/GraphObject.php' );
require_once( __DIR__ . '/facebook-php-sdk-v4/src/Facebook/Entities/AccessToken.php' );
require_once( __DIR__ . '/facebook-php-sdk-v4/src/Facebook/HttpClients/FacebookHttpable.php' );
require_once( __DIR__ . '/facebook-php-sdk-v4/src/Facebook/HttpClients/FacebookCurlHttpClient.php' );
require_once( __DIR__ . '/facebook-php-sdk-v4/src/Facebook/HttpClients/FacebookCurl.php' ); 

use Facebook\FacebookSession;
use Facebook\FacebookRedirectLoginHelper;
use Facebook\FacebookRequest;
use Facebook\FacebookResponse;
use Facebook\FacebookSDKException;
use Facebook\FacebookRequestException;
use Facebook\FacebookAuthorizationException;
use Facebook\GraphObject;
use Facebook\Entities\AccessToken;
use Facebook\HttpClients\FacebookHttpable;
use Facebook\HttpClients\FacebookCurlHttpClient;
use Facebook\HttpClients\FacebookCurl;

FacebookSession::setDefaultApplication('XXXXXXXXXXXXXXXX', 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'); // app_id et app_secret de l'application Facebook

// facebook_publish()
// $page_id = id de la page facebook au nom de laquelle on veut publier
// $access_token = access token valide pour la page
// $publish_timestamp = timestamp de l'heure programmée de publication, entre 10 minutes et 6 mois (facultatif)
// $message = message posté (facultatif si on partage un lien)
// $link = lien partagé (facultatif si on a mis un message)
// $link_name = titre du lien (possible si lien partagé)
// $link_description = description du lien (possible si lien partagé)
function facebook_publish($page_id,$access_token,$publish_timestamp=false,$message='',$link='',$link_name='',$link_description='')
{
	if (!$page_id or !$access_token or (!$message and !$link))
		return array('error'=>'You must provide at lease a page_id, an access_token and a message or a link.');
	$session = new FacebookSession($access_token);
	$request = new FacebookRequest
	(
		$session,
		'POST',
		'/'.$page_id.'/feed',
		array
		(
			'published' => ($publish_timestamp)?false:true,
			'scheduled_publish_time' => ($publish_timestamp)?$publish_timestamp:false,
			'message' => $message,
			'link' => $link,
			'name' => $link_name,
			'description' => $link_description
		)
	);
	try
	{
		$response = $request->execute();
		$graphObject = $response->getRawResponse();
		return $graphObject; // si la requête ok, retourne {"id":"XXXXXXXXXXX_XXXXXXXXXXXXXXXXX"}
	}
	catch(Exception $e)
	{
		return $e;
	}
}

// facebook_delete()
// $post_id = id du post facebook à supprimer sous la forme XXXXXXXXXXX_XXXXXXXXXXXXXXXXX
// $access_token = assess token valide pour la page
function facebook_delete($post_id,$access_token)
{
	$session = new FacebookSession($access_token);
	$request = new FacebookRequest
	(
		$session,
		'DELETE',
		'/'.$post_id
	);
	try
	{
		$response = $request->execute();
		$graphObject = $response->getRawResponse();
		return $graphObject; // si la requête ok, retourne {"success":true}
	}
	catch(Exception $e)
	{
		return $e;
	}
}