/*
  * Social Limit - Only the social you care about.
  *
  * Enables your site to know which social bookmarking badges to display to your
  * visitors. It tells you all social sites the user has gone to, or you can 
  * query for a specific one.
  * 
  * For example:
  * 
  *    var sl = SocialHistory();
  *    alert( sl.doesVisit("Digg") ); // Returns true/false, -1 if unknown.
  *    var listOfVisitedSites = sl.visitedSites();
  *    var checkedSites = sl.checkedSites();
  *
  * If you want to add more sites to check, you can pass that in as a dictionary
  * to History:
  *
  *    var more = { "Humanized": "http://humanized.com",
  *                 "Azarask.in": ["http://azarask.in", "http://azarask.in/blog"]
  *               };
  *    var sl = SocialHistory(more);
  *    alert( sl.doesVisit("Humanized") );
  *
  * For a list of built-in sites, see the sites variable below.
  *
  * Copyright (c) 2008 Aza Raskin (http://azarask.in/blog)
  * 
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  *
  */
 
 var SocialHistory = function( moreSites ){
 
   var sites = {
     "Digg": ["http://digg.com", "http://digg.com/login"],
     "Reddit": ["http://reddit.com", "http://reddit.com/new/", "http://reddit.com/controversial/", "http://reddit.com/top/", "http://reddit.com/r/reddit.com/", "http://reddit.com/r/programming/"],
     "StumbleUpon": ["http://stumbleupon.com"],
     "Yahoo Buzz": ["http://buzz.yahoo.com"],
     "Facebook": ["http://facebook.com/home.php", "http://facebook.com", "https://login.facebook.com/login.php"],
     "Del.icio.us": ["https://secure.del.icio.us/login", "http://del.icio.us/"],
     "MySpace": ["http://www.myspace.com/"],
     "Technorati": ["http://www.technorati.com"],
     "Newsvine": ["https://www.newsvine.com", "https://www.newsvine.com/_tools/user/login"],
     "Songza": ["http://songza.com"],
     "Slashdot": ["http://slashdot.org/"],
     "Ma.gnolia": ["http://ma.gnolia.com/"],
     "Blinklist": ["http://www.blinklist.com"],
     "Furl": ["http://furl.net", "http://furl.net/members/login"],
     "Mister Wong": ["http://www.mister-wong.com"],
     "Current": ["http://current.com", "http://current.com/login.html"],
     "Menaeme": ["http://meneame.net", "http://meneame.net/login.php"],
     "Oknotizie": ["http://oknotizie.alice.it", "http://oknotizie.alice.it/login.html.php"],
     "Diigo": ["http://www.diigo.com/", "https://secure.diigo.com/sign-in"],
     "Funp": ["http://funp.com", "http://funp.com/account/loginpage.php"],
     "Blogmarks": ["http://blogmarks.net"],
     "Yahoo Bookmarks": ["http://bookmarks.yahoo.com"],
     "Xanga": ["http://xanga.com"],
     "Blogger": ["http://blogger.com"],
     "Last.fm": ["http://www.last.fm/", "https://www.last.fm/login/"],
     "N4G": ["http://www.n4g.com"],
     "Faves": ["http://faves.com", "http://faves.com/home", "https://secure.faves.com/signIn"],
     "Simpy": ["http://www.simpy.com", "http://www.simpy.com/login"],
     "Yigg": ["http://www.yigg.de"],
     "Kirtsy": ["http://www.kirtsy.com", "http://www.kirtsy.com/login.php"],
     "VKontakte": ["http://www.vkontakte.ru"],
     "Odnoklasniki": ["http://www.odnoklasniki.ru"],
     "Google": ["http://www.google.com", "http://www.google.com"],
     "MailRu": ["http://www.mail.ru/"],
     "RBC news": ["http://www.rbc.ru/"],
     "Yandex": ["http://www.yandex.ru/","http://www.ya.ru/", "http://mail.yandex.ru"]
   };
   
   for( var site in moreSites ) {
     // If we don't have the site, create the URL list.
     if( typeof( sites[site] ) == "undefined" ) sites[site] = [];
     
     // If the value is string, just push that onto the URL list.
     if( typeof( moreSites[site] ) == "string" )
       sites[site].push( moreSites[site] );
     else
       sites[site] = sites[site].concat( moreSites[site] );
   }
   
   var visited = {};
 
   function getStyle(el, scopeDoc,styleProp) {
     if (el.currentStyle)
       var y = el.currentStyle[styleProp];
     else if (window.getComputedStyle)
       var y = scopeDoc.defaultView.getComputedStyle(el,null).getPropertyValue(styleProp);
     return y;
   }
   
   function remove( el ) {
     el.parentNode.removeChild( el );
   }
   
   // Code inspired by:
   // bindzus.wordpress.com/2007/12/24/adding-dynamic-contents-to-iframes
   function createIframe() {
     var iframe = document.createElement("iframe");
     iframe.style.position = "absolute";
     iframe.style.visibility = "hidden";
 
     document.body.appendChild(iframe);
 
     // Firefox, Opera
     if(iframe.contentDocument) iframe.doc = iframe.contentDocument;
     // Internet Explorer
     else if(iframe.contentWindow) iframe.doc = iframe.contentWindow.document;
 
     // Magic: Force creation of the body (which is null by default in IE).
     // Also force the styles of visited/not-visted links.
     iframe.doc.open();
         iframe.doc.write('<style>');
         iframe.doc.write("a{color: #000000; display:none;}");   
         iframe.doc.write("a:visited {color: #FF0000; display:inline;}");        
         iframe.doc.write('</style>');
     iframe.doc.close();
     
     // Return the iframe: iframe.doc contains the iframe.
     return iframe;
   }  
 
   var iframe = createIframe();
   
   function embedLinkInIframe( href, text ) {
     var a = iframe.doc.createElement("a");
     a.href = href;
     a.innerHTML = site;
     iframe.doc.body.appendChild( a );
   }
   
   for( var site in sites ) {
     var urls = sites[site];
     for( var i=0; i<urls.length; i++ ) {
       // You have to create elements in the scope of the iframe for IE.
       embedLinkInIframe( urls[i], site );
       
       // Automatically try variations of the URLS with and without the "www"
       if( urls[i].match(/www\./) ){
         var sansWWW = urls[i].replace(/www\./, "");
         embedLinkInIframe( sansWWW, site );
       } else {
         // 2 = 1 for length of string + 1 for slice offset
         var httpLen = urls[i].indexOf("//") + 2;
         var withWWW = urls[i].substring(0, httpLen ) + "www." + urls[i].substring( httpLen );
         embedLinkInIframe( withWWW, site );
       }
       
     }
   }
     
   var links = iframe.doc.body.childNodes;
   for( var i=0; i<links.length; i++) {
     // Handle both Firefox/Safari, and IE (respectively)
     var displayValue = getStyle(links[i], iframe.doc, "display");
     var didVisit = displayValue != "none";
       
     if( didVisit ){
       visited[ links[i].innerHTML ] = true;
     }
   }
   
   remove( iframe );
   
   return new (function(){
     var usedSites = [];
     for( var site in visited ){
       usedSites.push( site );
     }
     
     // Return an array of visited sites.
     this.visitedSites = function() {
       return usedSites;
     }
     
     // Return true/false. If we didn't check the site, return -1.
     this.doesVisit = function( site ) {
       if( typeof( sites[site] ) == "undefined" )
         return -1;
       return typeof( visited[site] ) != "undefined";
     }
     
     var checkedSites = [];
     for( var site in sites ){
       checkedSites.push( site );
     }
     // Return a list of the sites checked.
     this.checkedSites = function(){
       return checkedSites;
     }
   })();
 }