/* 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", "lib-app/facebook-oauth", "storage");

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

/**
 * 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.isAppAdded = +request.params.fb_sig_added;

fb.canvasPath = function (tail) { return fb.fullCanvasUrl+tail; };

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));
    }
};

import("lib-support/useful");

/** 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;
  },
  /**
   * Creates FB_INTL from supplied element.
   * Element should have desc (description),
   * body (text that may contain {tokens}),
   * tokens (comma-separated list of token names
   * to be inserted as FB_INTL_TOKEN, optional)
   * and multiline (if defined, contains delimiter token name
   * that is inserted as <br />, optional).
   * fbIntl.tokens contains functions that populate token bodies,
   * you should populate it if you want to have FB_INTL_TOKENs inserted.
   * Token populator functions in localTokenFuns arg are also used, if supplied.
   * If replacer function does not exist, the token is not inserted
   * and no warning or error is raised.
   */
  fbIntl: function fbIntl (element, localTokenFuns) {
    var result = FB_INTL({desc: element.desc});

    var body = [element.body];

    var tokens = element.tokens ? element.tokens.split(",") : [],
      tokenFuns = fbIntl.tokens;
    if (!localTokenFuns) { localTokenFuns = {}; }
    if (element.multiline) {
      tokens.push(element.multiline);
      var br = BR();
      localTokenFuns[element.multiline] = function () { return br; };
    }

    tokens.forEach(function (token) {
      var f = localTokenFuns[token] || tokenFuns[token];
      if (f) {
        if (f.direct) {
          splitReplace(body, "{"+token+"}", f(token, element)); 
        } else {
          result.push(FB_INTL_TOKEN({name:token}, f(token, element)));
        }
      }
    });
    result.unshift.apply(result, body);

    return result;
  }//,
};

fb.ui.fbIntl.tokens = {};