<script>
  // This is called with the results from from FB.getLoginStatus().
  function statusChangeCallback(response) {
    console.log('statusChangeCallback');
    console.log(response);
    // The response object is returned with a status field that lets the
    // app know the current login status of the person.
    // Full docs on the response object can be found in the documentation
    // for FB.getLoginStatus().
    if (response.status === 'connected') {
      // Logged into your app and Facebook.
      eseguiLogin();
    } else {
      
    }
  }

  // This function is called when someone finishes with the Login
  // Button.  See the onlogin handler attached to it in the sample
  // code below.
  function checkLoginState() {
    FB.getLoginStatus(function(response) {
      statusChangeCallback(response);
    });
  }

  window.fbAsyncInit = function() {
    FB.init({
      appId      : '<?php echo $impostazioni["idAppFacebook"]; ?>',
      cookie     : true,  // enable cookies to allow the server to access 
                          // the session
      xfbml      : true,  // parse social plugins on this page
      version    : 'v3.3' // The Graph API version to use for the call
    });

    // Now that we've initialized the JavaScript SDK, we call 
    // FB.getLoginStatus().  This function gets the state of the
    // person visiting this page and can return one of three states to
    // the callback you provide.  They can be:
    //
    // 1. Logged into your app ('connected')
    // 2. Logged into Facebook, but not your app ('not_authorized')
    // 3. Not logged into Facebook and can't tell if they are logged into
    //    your app or not.
    //
    // These three cases are handled in the callback function.

    FB.getLoginStatus(function(response) {
      statusChangeCallback(response);
    });

  };

  // Load the SDK asynchronously
  (function(d, s, id) {
    var js, fjs = d.getElementsByTagName(s)[0];
    if (d.getElementById(id)) return;
    js = d.createElement(s); js.id = id;
    js.src = "https://connect.facebook.net/en_US/sdk.js";
    fjs.parentNode.insertBefore(js, fjs);
  }(document, 'script', 'facebook-jssdk'));

  // Here we run a very simple test of the Graph API after login is
  // successful.  See statusChangeCallback() for when this call is made.
  function eseguiLogin() {
    console.log('Welcome!  Fetching your information.... ');
    FB.api('/me', {fields: 'first_name,last_name,email'},function(response) {
	$.ajax({
		type:"POST",
		url:"utenti/loginFacebook.php",
		data:{
			nome:response.first_name,
			cognome:response.last_name,
			email:response.email
		},
		success:function(esito) {
			if(esito=="ok") {
				location.href='<?php echo "pagina.php?id={$impostazioni["homeUtente"]}"; ?>';
			}
			else if(esito=="giaLoggato") {
				// in questo caso non deve fare nulla perché l'utente è già loggato
			}
			else {
				alert(esito);
			}
		}
	});
    });
  }

</script>