// ==UserScript==
// @name           Last.fm with Oink
// @namespace      http://term.ie/devdev/
// @description    Shows a link to browse Oink next to any artist link on last.fm
// @include        http://*.last.fm/*
// @include        http://last.fm/*
// ==/UserScript==
// Directly this from (with minor modifications) 
// http://mll02.free.fr's Last.fm with Allmusic


(function()
{
    gUseIcon = true;
    gUseText = false;


    function isArtistURL(theUrl)
    {
        if (theUrl == null)
            return(false);

        // Looking for "/music/".  If any more slashes are found, then this is not a URL to the artist itself.
        var searchStr = "/music/";
       
        // We don't want links to music recommendation
        if (theUrl.indexOf("/recommended/music/") >= 0) return (false) ;

        var pos = theUrl.indexOf(searchStr);
        // Is the prefix correct?
        if (pos >= 0)
        {
            var temp = theUrl.substring(pos + searchStr.length);
           
            // Are there any more slashes? One more is ok.
            var pos = temp.indexOf("/");
            // If there are no more slashes, then success.
            if (pos == -1)
                return(true);
            temp = temp.substring(pos+1);
           
            // Is there anything left?
            return (temp == null || temp.length == 0);
        }
    }       
   
    function getNodeText(node, goDeep)
    {
        var nodeText = node.nodeValue;
       
        if (goDeep && nodeText == null && node.childNodes != null && node.childNodes.length > 0)
        {
            nodeText= "";
           
            for (var i=0; i < node.childNodes.length; ++i)
            {
                nodeText += getNodeText(node.childNodes.item(i), goDeep);   
            }
        }
        return(nodeText == null ? "" : nodeText);
    }
   
    function makeLink(artistName)
    {
        if (artistName != null && artistName.length > 0 && artistName != "Overview" && artistName != "Music")
        {
            var container = document.createElement("span");
           
            container.appendChild(document.createTextNode(" "));

            var newLink = document.createElement("a");
            newLink.setAttribute("href", "http://oink.cd/browse.php?search=" + escape(artistName));
            
            if (gUseText) {
                newLink.appendChild(document.createTextNode("{oink}"));
            }

            if (gUseIcon) {
                var newImg = document.createElement("img");
                newImg.setAttribute("src", "http://term.ie/data/oinkfavicon.gif");
                newImg.setAttribute("style", "display: inline; margin-bottom: -6px; position: relative;");
                newLink.appendChild(newImg);
            }
            container.appendChild(newLink);

            return(container);
        }
       
        return(null);
    }

    function insertLinks()
    {
       
        var hyperlinks = document.getElementsByTagName("a");
        for (var i = 0; i < hyperlinks.length; ++i)
        {
            var node = hyperlinks[i];
            var href = node.getAttribute("href");
            if (isArtistURL(href))
            {
                var link = makeLink(getNodeText(node, true));
                if (link != null)
                {
                    if (node.nextSibling == null)
                        node.parentNode.appendChild(link);
                    else
                        node.parentNode.insertBefore(link, node.nextSibling);
                }
            }               
        }
    }
   
    insertLinks();
   
})();