/*
* 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 = {
  "Facebook": ["http://facebook.com/home.php", "http://facebook.com", "https://login.facebook.com/login.php"],
  "Digg": ["http://digg.com", "http://digg.com/login"],
  "Twitter": ["http://twitter.com/"],
//  "MySpace": ["http://www.myspace.com/"],
  "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"],
  "Delicious": ["https://secure.del.icio.us/login", "http://del.icio.us/", "http://delicious.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"],
//  "Fark": ["http://www.fark.com", "http://cgi.fark.com/cgi/fark/users.pl?self=1"],
//  "Mixx": ["https://www.mixx.com/login/dual", "http://www.mixx.com"],
//  "Google Bookmarks": ["http://www.google.com/bookmarks", "http://www.google.com/ig/add?moduleurl=bookmarks.xml&hl=en"],
//  "Subbmitt": ["http://subbmitt.com/"]
 };

	 
	 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;
	 	 }
	 })();
}