<?php
require MODX_CORE_PATH . 'components/facebook/facebook.php';

//what permissions do we want
$par = array();
$par['req_perms'] = "email,user_hometown,user_website";


//
// Where do these come from? Add them as Properties to the snippet!
//
$appId= $modx->getOption('appId',$scriptProperties,'');
$secret= $modx->getOption('secret',$scriptProperties,'');

if(empty($appId) || empty($secret)){
$output='No AppID or Secret Provided, please obtain from developer.facebook.com';
return $output;
}


// Create our Application instance.
$facebook = new Facebook(array(
  'appId' => $appId,
  'secret' => $secret,
  'cookie' => true,
));

$user = $facebook->getUser();


/*
* Make the appID and current session available to the front end
* (in case you want to add more social features using Javascript, specify those in the init() call)
*/
$modx->toPlaceholder('facebook_session',json_encode($user));
$modx->toPlaceholder('facebook_app_id',$facebook->getAppId());

$output="";

$me = null;
// Session based API call.
if ($user) {
  try {
    $uid = $facebook->getUser();
    $me = $facebook->api('/me');

  } catch (FacebookApiException $e) {
    error_log($e);
  }
}

// login or logout url will be needed depending on current user state.
if ($me) {
//die(print_r($me));

    $contexts = empty($contexts) ? array($modx->context->get('key')) : explode(',', $contexts);
        foreach (array_keys($contexts) as $ctxKey) {
        $contexts[$ctxKey] = trim($contexts[$ctxKey]);
        }

    $user = $modx->getObject('modUser',  array('remote_key:=' => $me['id'], 'remote_key:!=' => null));

    if(empty($user)){
            //they're new!
        //facebook may pass multiple hometowns back
        if(!empty($me['hometown'])){
            if(is_array($me['hometown'])){
               $homet=$me['hometown'][0];
            }else{
                   $homet=$me['hometown'];
            }
        }

        // Create an empty modx user and populate with facebook data
        $user = $modx->newObject('modUser');
        $user->fromArray(
                          array('username' => $me['name'],'active' => true
                        ,'remote_key' => $me['id'] ,'remote_data' => $me //store the remote data as json object in db (in case you need more info bout the FB user later)
                     )
                   );

               //We'll also toss a profile on to save their email and photo and such
        $profile = $modx->newObject('modUserProfile');
        $profile->fromArray(array(
                //old email line - isset($me['email']) ? $me['email'] : 'facebook-user@facebook.com'
        'email' =>  isset($me['email'])
        ,'fullname' => $me['name']
        ,'city' => $homet
                ,'photo'=> 'http://graph.facebook.com/'. $me['id'] .'/picture'
        ));
        $user->addOne($profile, 'Profile');


                /** Login, (C) 2010, Jason Coward, Shaun McCormick**/

        /* if usergroups set */
        $usergroups = $modx->getOption('usergroups',$scriptProperties,'');
        if (!empty($usergroups)) {
            $usergroups = explode(',',$usergroups);

            foreach ($usergroups as $usergroupMeta) {
            $usergroupMeta = explode(':',$usergroupMeta);
            if (empty($usergroupMeta[0])) continue;

            /* get usergroup */
            $pk = array();
            $pk[intval($usergroupMeta[0]) > 0 ? 'id' : 'name'] = $usergroupMeta[0];
            $usergroup = $modx->getObject('modUserGroup',$pk);
            if (!$usergroup) continue;

            /* get role */
            $rolePk = !empty($usergroupMeta[1]) ? $usergroupMeta[1] : 'Member';
            $role = $modx->getObject('modUserGroupRole',array('name' => $rolePk));

            /* create membership */
            $member = $modx->newObject('modUserGroupMember');
            $member->set('member',0);
            $member->set('user_group',$usergroup->get('id'));
            if (!empty($role)) {
                $member->set('role',$role->get('id'));
            } else {
                $member->set('role',1);
            }
            $user->addMany($member,'UserGroupMembers');
            }//end foreach
        }//end user grops
        /** End Login Code Block froom Login, (C) 2010 Jason Coward, Shaun McCormick **/
        $saved = $user->save();
    }//end if new user

    //new or not, they're logged in
        if(!$user->hasSessionContext('web')){
       foreach ($contexts as $context) {
        $user->addSessionContext($context);
       }

       $modx->sendRedirect('/');
        }

} else {
    //else give them the chance to login
/* This should parse the generated URL with a chunk, for now you can edit the image or text here */
    $output.= '<a href="'.$facebook->getLoginUrl($par).'"><img src="http://static.ak.fbcdn.net/rsrc.php/zB6N8/hash/4li2k73z.gif"></a>';
}


return $output;