var svgns = "http://www.w3.org/2000/svg";
var xlinkns = "http://www.w3.org/1999/xlink";

GetParams();

function GetParams()
{
    var uids = [];

    var paramArray = [];
    if ( document.defaultView.frameElement )
    {
        var params = document.defaultView.frameElement.getElementsByTagName("param");

        for ( var i = 0, iLen = params.length; iLen > i; i++ )
        {
            var eachParam = params[ i ];
            var name = eachParam.getAttribute( "name" );
            var value = eachParam.getAttribute( "value" );

            paramArray[ name ] = value;
        }
    }

    var href = document.defaultView.location.href;
    if ( -1 != href.indexOf("?") )
    {
        var paramList = href.split("?")[1].split(/&|;/);
        for ( var p = 0, pLen = paramList.length; pLen > p; p++ )
        {
            var eachParam = paramList[ p ];
            var valList = eachParam.split("=");
            var name = unescape(valList[0]);
            var value = unescape(valList[1]);

            paramArray[ name ] = value;
        }
    }

    SetElementValues( paramArray, uids );
}


function GetValue( attrStr, params )
{
    // parse attribute value for parameter reference and fallback value
    var paramSplit = attrStr.split(")");
    var paramName = paramSplit[0].replace("param(","");
    var defaultVal = null;
    if (paramSplit[1])
    {
        defaultVal = paramSplit[1].replace(/^\s\s*/, "").replace(/\s\s*$/, "");
    }

    var newVal = params[ paramName ];
    if ( !newVal )
    {
        newVal = defaultVal;
    }

    return newVal;
}


function SetElementValues( params, uids  )
{
    var useEls =[];
    var elList = document.documentElement.getElementsByTagName( "*" );
    for ( var i = 0, iLen = elList.length; iLen > i; i++ )
    {
        var eachEl = elList[ i ];
        if ( "use" != eachEl.localName )
        {
            SetParamValues( eachEl, params );
        }
        else
        {
            var shadow = EmulateShadowTree( eachEl, params, uids, i );
            if ( shadow )
            {
                useEls.push( [ eachEl, shadow ] );
            }
        }
    }

    for ( var u = 0, uLen = useEls.length; uLen > u; u++ )
    {
        var useEl = useEls[ u ][0];
        var shadow = useEls[ u ][1];
        useEl.setAttribute("display", "none");
        if (useEl.nextSibling)
        {
            useEl.parentNode.insertBefore(shadow, useEl.nextSibling);
        }
        else
        {
            useEl.parentNode.appendChild(shadow);
        }
    }
}


function SetParamValues( el, params, isShadow )
{
    for ( var a = 0, aLen = el.attributes.length; aLen > a; a++ )
    {
        var attr = el.attributes[ a ];
        if (attr)
        {
            var attrVal = attr.value;

            if ( -1 != attrVal.indexOf( "param(" ) )
            {
                //alert("attr: " + attr.localName + "\nvalue: " + attrVal)
                if ( "params" == attr.localName )
                {
                    // alert("attr.name: " + attr.name + "\nattrVal: " + attrVal + "\nisShadow: " + isShadow)
                    if (isShadow)
                    {
                        //alert(attrVal)
                        var paramSplit = attrVal.split(";");
                        for ( var p = 0, pLen = paramSplit.length; pLen > p; p++ )
                        {
                            var eachPair = paramSplit[ p ];
                            // alert("eachPair: " + eachPair)
                            var pairSplit = eachPair.split(":");
                            var newAttr = pairSplit[0];

                            var newVal = GetValue( pairSplit[1], params );

                            var attrns = null;
                            if ( "href" == newAttr || "xlink:href" == newAttr )
                            {
                                attrns = xlinkns;
                            }
                            el.setAttributeNS( attrns, newAttr, newVal);
                        }
                    }
                }
                else
                {
                    var newVal = GetValue( attrVal, params );

                    if ( null != newVal && "" != newVal )
                    {
                        if ( "content-value" == attr.localName )
                        {
                            el.replaceChild( document.createTextNode( newVal ), el.firstChild );
                        }
                        else
                        {
                            el.setAttributeNS( attr.namespaceURI, attr.name, newVal);
                            //alert("attr.name: " + attr.name + "\nattrVal: " + newVal)

                            // note replacement values in params metadata attribute
                            var paramAttrVal = el.getAttribute( "params" );
                            if ( paramAttrVal )
                            {
                                el.setAttribute( "params", paramAttrVal + ";" + attr.name + ":" + attrVal);
                                //alert(paramAttrVal)
                            }
                            else
                            {
                                el.setAttribute( "params", attr.name + ":" + attrVal);
                            }
                        }
                    }
                }
            }
        }
    }
}


// au37k
//emulate modifying shadow tree by duplicating element are replacing over use element
function EmulateShadowTree( el, params, uids, idnum )
{
    //alert("EmulateShadowTree")
    shadowParams = params;
    var hasParam = false;
    var cn = el.childNodes;
    for ( var c = 0, cLen = cn.length; cLen > c; c++ )
    {
        var eachChild = cn[ c ];
        //alert(eachChild + ": " + eachChild.nodeType)
        if ( 1 == eachChild.nodeType && "param" == eachChild.localName)
        {
            var name = eachChild.getAttribute( "name" );
            var val = eachChild.getAttribute( "value" );
            shadowParams[ name ] = val;
            hasParam = true;
            // alert("name: " + name + "\nvalue: " + val)
        }
    }

    var parametersAttrVal = el.getAttribute( "parameters" );
    if( parametersAttrVal )
    {
        // alert(parametersAttrVal)
        var paramSplit = parametersAttrVal.split(";");
        for ( var p = 0, pLen = paramSplit.length; pLen > p; p++ )
        {
            var eachPair = paramSplit[ p ];
            //alert("eachPair: " + eachPair)
            var pairSplit = eachPair.split(":");
            shadowParams[ pairSplit[0] ] = pairSplit[1];
            hasParam = true;
        }
    }

    if ( hasParam )
    {
        //alert("hasParam")
        var idref = el.getAttributeNS( xlinkns, "href").replace("#", "");
        var refEl = document.getElementById( idref );

        //emulate modifying shadow tree by duplicating element are replacing over use element
        var newEl = refEl.cloneNode(true);

        // alert("EmulateShadowTree:\n\nnewEl:" + newEl + "\nshadowParams: " + shadowParams )
        SetParamValues( newEl, shadowParams, true );

        var wrapper = document.createElementNS( svgns, "g");
        var shadow = document.createElementNS( svgns, "g");
        for ( var ua = 0, uaLen = el.attributes.length; uaLen > ua; ua++ )
        {
            var attr = el.attributes[ ua ];
            if ( "content-value" != attr.localName && "params" != attr.localName && "parameters" != attr.localName
                && "href" != attr.localName && "x" != attr.localName && "y" != attr.localName )
            {
                //copy use element attributes to replacement image
                shadow.setAttribute( attr.name, attr.value);
            }
        }

        var x = el.getAttribute("x");
        var y = el.getAttribute("y");
        wrapper.setAttribute( "transform", "translate(" + x + "," + y + ")");

        shadow.appendChild(newEl);
        wrapper.appendChild(shadow);


        var shadowEls = newEl.getElementsByTagName( "*" );
        for ( var e = 0, eLen = shadowEls.length; eLen > e; e++ )
        {
            var eachEl = shadowEls[ e ];
            SetParamValues( eachEl, shadowParams, true );

            for ( var a = 0, aLen = eachEl.attributes.length; aLen > a; a++ )
            {
                var attr = eachEl.attributes[ a ];
                var attrVal = attr.value;
                //alert("attr: " + attr.localName + "\nvalue: " + attrVal)
                if ( "id" == attr.localName )
                {
                    //change id to unique id
                    eachEl.setAttribute( attr.name, attrVal + "__" + idnum);
                    uids[attrVal] = attrVal + "__" + idnum;
                }

                //alert( attrVal )
                if ( -1 != attrVal.indexOf("url(#") )
                {
                    //alert( attrVal )
                    for ( uid in uids )
                    {
                        //alert( uid + ": " + uids[uid] )
                        if ( -1 != attrVal.indexOf( "url(#" + uid + ")" ) )
                        {
                            eachEl.setAttributeNS( attr.namespaceURI, attr.name, "url(#" + uids[uid] + ")" );
                        }
                    }
                }
            }
        }

        return wrapper;
    }
    return null;
}