/*
* 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"],
        "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) {
            return el.currentStyle[styleProp];
        }
        else {
            if (scopeDoc != null && scopeDoc.defaultView != null && scopeDoc.defaultView != 'undefined' && scopeDoc.defaultView.getComputedStyle != 'undefined') {
                var style = scopeDoc.defaultView.getComputedStyle(el, null);

                if (style != null) {
                    return style.getPropertyValue(styleProp);
                }
            }
        }

        return '';
    }

    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");
        try {
            iframe.src = "javascript:'';";
            iframe.style.position = "absolute";
            iframe.style.visibility = "hidden";

            document.body.appendChild(iframe);

            if (iframe.contentDocument) {
                // Firefox, Opera
                iframe.doc = iframe.contentDocument;
            }
            else if (iframe.contentWindow) {
                // Internet Explorer
                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();
        }
        catch (err) {
            //Handle errors here
        }

        // Return the iframe: iframe.doc contains the iframe.
        return iframe;
    }

    var iframe = createIframe();

    function embedLinkInIframe(href, text) {
        try {
            var a = iframe.doc.createElement("a");
            a.href = href;
            a.innerHTML = site;
            iframe.doc.body.appendChild(a);
        }
        catch (err) {
            //Handle errors here
        }
    }

    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);
            }

        }
    }

    try {
        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;
            }
        }
    }
    catch (err) {
        //Handle errors here
    }

    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;
        }
    })();
}