var Facebook = new Class({

    Implements: Options,

    options: {
        'prefix_multiselect_friend' : 'invite'
    },

    initialize: function(options) {
        this.setOptions(options);
    },


    initFriendsMultiselect: function(element) {

        $$(element).each(function(el, i) {
            el.addEvent('mouseover', function() {
                el.set('styles', {
                    'border': '2px solid #0042BD'
                })
            }).addEvent('mouseout', function() {
                el.set('styles', {
                    'border': '2px solid #FFF'
                })
            }).addEvent('click', function() {
                var element = el.get('id') + '_' + this.options.prefix_multiselect_friend;
                this.checkFriendsMultiselect(el, element);
            }.bind(this, el));
        }.bind(this));
    },

    checkFriendsMultiselect: function(container, checkbox_id) {
        var input = $(checkbox_id);
        var isChecked = input.getProperty('checked');

        if (isChecked === true) {
            input.setProperty('checked', false);
            container.set('styles', {
                'background-color' : '#FFFFFF'
            });
        }
        else {
            input.setProperty('checked', true);
            container.set('styles', {
                'background-color' : '#F5F5B8'
            });
        }
    }

});


/*
* The facebook_onload statement is printed out in the PHP. If the user's logged in
* status has changed since the last page load, then refresh the page to pick up
* the change.
*
* This helps enforce the concept of "single sign on", so that if a user is signed into
* Facebook when they visit your site, they will be automatically logged in -
* without any need to click the login button.
*
* @param already_logged_into_facebook  reports whether the server thinks the user
*                                      is logged in, based on their cookies
*
*/
function facebook_onload(already_logged_into_facebook) {
    // user state is either: has a session, or does not.
    // if the state has changed, detect that and reload.
    FB.ensureInit(function() {
        FB.Facebook.get_sessionState().waitUntilReady(function(session) {
            var is_now_logged_into_facebook = session ? true : false;

            // if the new state is the same as the old (i.e., nothing changed)
            // then do nothing
            if (is_now_logged_into_facebook == already_logged_into_facebook) {
                return;
            }

            // otherwise, refresh to pick up the state change
            refresh_page();
        });
    });
}

/*
* Our <fb:login-button> specifies this function in its onlogin attribute,
* which is triggered after the user authenticates the app in the Connect
* dialog and the Facebook session has been set in the cookies.
*/
function facebook_onlogin(url) {
    window.location = url;
}


/*
* Prompts the user to grant a permission to the application.
*/
function facebook_prompt_permission(permission) {
    FB.ensureInit(function() {
        FB.Connect.showPermissionDialog(permission);
    });
}

/*
* Show the feed form. This would be typically called in response to the
* onclick handler of a "Publish" button, or in the onload event after
* the user submits a form with info that should be published.
*
*/
function facebook_publish_feed_story(form_bundle_id, template_data) {
    // Load the feed form
    FB.ensureInit(function() {
        FB.Connect.showFeedDialog(form_bundle_id, template_data);
        //FB.Connect.showFeedDialog(form_bundle_id, template_data, null, null, FB.FeedStorySize.shortStory, FB.RequireConnect.promptConnect);

        // hide the "Loading feed story ..." div
        ge('feed_loading').style.visibility = "hidden";
    });
}

/*
* If a user is not connected, then the checkbox that says "Publish To Facebook"
* is hidden in the "add run" form.
*
* This function detects whether the user is logged into facebook but just
* not connected, and shows the checkbox if that's true.
*/
function facebook_show_feed_checkbox() {
    FB.ensureInit(function() {
        FB.Connect.get_status().waitUntilReady(function(status) {
            if (status != FB.ConnectState.userNotLoggedIn) {
                // If the user is currently logged into Facebook, but has not
                // authorized the app, then go ahead and show them the feed dialog + upsell
                checkbox = ge('publish_fb_checkbox');
                if (checkbox) {
                    checkbox.style.visibility = "visible";
                }
            }
        });
    });
}

function fb_init() {
     FB.Facebook.init();
}