/* appjet:version 0.1 */
/* appjet:library */
// Copyright (c) 2009, 2010, Herbert Vojčík
// Licensed by MIT license (http://www.opensource.org/licenses/mit-license.php)

import("facebook", "storage");

// TODO new FBML tags
importTags(this, [
"FB:INTL",
"FB:INTL-TOKEN",
"FB:TAG-ATTRIBUTE",
"FB:TAG-BODY",
"FB:TAG",
]);

/**
 * Contains uid usable in not-logged canvas scenarios as well.
 * Either it contains fb.uid, canvas user or
 * "loggedinuser"
 */
fb.any_uid = fb.uid;
if (fb.any_uid == -1) {
    fb.any_uid = request.params.fb_sig_canvas_user;
    if (!fb.any_uid) fb.any_uid = "loggedinuser";
}

fb.requireLogin = function (perms) {
    if (request.params.fb_sig_added != '1') {
        fb.redirect("http://www.facebook.com/login.php?"
            +"v=1.0&"
            +"canvas=1&"
            +(perms?"req_perms="+perms.join()+"&":"")
            +"api_key="+storage.facebooklib.apiKey+"&"
            +"next="+encodeURIComponent(fb.fullCanvasUrl));
    }
};

/** Place for convenience extension functions for UI */
fb.ui = {
/**
 * Creates tabs according to items parameter.
 * If actual url matches one of them, it is selected.
 * Next example renders tabs for .../callback/profile, .../callback/invite and .../callback/play.
 @example
 print(fb.ui.tabs("profile_Profile", "invite_Invite friends", "play_Play!"));
 */
    tabs: function (items) {
        var menu = FB_TABS();
        var lastSegment = request.path.split("/").pop();
        items.forEach (function (item) {
            var split = item.split("_");
            menu.push(FB_TAB_ITEM({
                href: split[0],
                title: split[1],
                selected: lastSegment === split[0]
            }));
        });
        return menu;
    }
};