/* Support for DecisionTree Module */
function setVisibilty(id,setting){
    var elem = document.getElementById(id);
    if (elem){
        elem.style.display=setting;
    }
}

function hide(id){
    setVisibilty(id,"none");
}

function show(id){
    setVisibilty(id,"");
}

function setEnable(id,setting){
    show(id);
    var elem = document.getElementById(id);
    if (elem){
        if(setting){
            elem.style.backgroundColor = "#FF4819";
        }else{
            elem.style.backgroundColor = "#ccc";
        }
    }
}

function update_dec(ldepth){	  
    $('.tree_ajax').show();//show the image for ajax loading
    
    hide('results');
    hide('alternate');
    
    fillElement('suggestion_val',"GO");
    setEnable('suggestion', false);
    
    for (i=(ldepth+1);i<max_depth;i++){
        resetSelect('dts_'+i);
        hide('dts_'+i);
    }
    sel = -1;
    if (ldepth > -1){
        sel = getSelectionValue('dts_'+ldepth);
    }
    depth = ldepth + 1;
    loadXMLDoc(base_url.replace('DID',sel), populate_next);
     	
}
	
function populate_next(datareq){
    // only if req shows "loaded"
    if (datareq.readyState == 4){
        // only if "OK"
        if (datareq.status == 200){
            subdec = datareq.responseXML.getElementsByTagName('decision');
            if (subdec.length == 0){
                sel = getSelectionValue('dts_'+(depth-1));
                loadXMLDoc(base_url.replace('DID',sel).replace('get_dec','get_outcome'), populate_last);	
            }else{
                populateFromDOM('dts_'+depth, subdec);
                show('dts_'+depth);
            }
        }else{
            //alert("There was a problem retrieving the XML data:\n" + datareq.statusText);
        }
    }
}

function populate_last(datareq){
    req = datareq;

    // only if req shows "loaded"
    if (req.readyState == 4){
        // only if "OK"
        if (req.status == 200){
            subdec = req.responseXML.getElementsByTagName('decision');
            if(subdec.length > 0){
                var returns = subdec[0].getElementsByTagName('returns')[0].childNodes[0].data;
                if (returns && returns != ''){
                    fillElement('results_val',returns);
                    show('results');
                }
                var alt = subdec[0].getElementsByTagName('alternate')[0].childNodes[0].data;
                if (alt && alt != ''){
                    fillElement('alternate_val',alt);
                    show('alternate');
                }
                var sug = subdec[0].getElementsByTagName('suggestion')[0].childNodes[0].data;
                if (sug && sug != ''){
                    fillElement('suggestion_val',sug);
                    setEnable('suggestion', true);
                }
            }
        }else{
            //alert("There was a problem retrieving the XML data:\n" + req.statusText);
        }
    }
}

function fillElement(id,string){
    var item = document.getElementById(id);
    if (item){
        item.innerHTML = string;
    }
}

function appendToSelect(select, value, content, selected){
    var opt;
    opt = document.createElement("option");
    if (selected)
        opt.selected = "true";
    opt.value = value;
    opt.appendChild(document.createTextNode(content));
    select.appendChild(opt);
}

function getSelectionText(id){
    var select = document.getElementById(id);
    if (select.selectedIndex >= 0)
        return select.options[select.selectedIndex].text;
    return "";
}

function getSelectionValue(id){
    var select = document.getElementById(id);
    return select.options[select.selectedIndex].value;
}

function resetSelect(id){
    var sel = document.getElementById(id);
    while (typeof(sel.length) != "undefined" && sel.length > 0){
        try {
            sel.remove(0);
        } catch (IEBug){ }
    }
}

function resetRadio(id){
    setRadio(formFields[id]["radioname"], -1);
    formFields[id]["filled"] = 0;
}

function populateFromDOM(id, dom){
    //console.debug(dom);
    var select = document.getElementById(id);
    for (var i = 0; i < dom.length; i++){
        if (i == 0){
            var prompt = dom[i].getElementsByTagName('prompt');
            if (prompt && prompt.length > 0){
                appendToSelect(select,'',prompt[0].childNodes[0].data);
            }else{
                appendToSelect(select,'',dprompt);
            }
        }
        appendToSelect(select, dom[i].getElementsByTagName('decision_id')[0].childNodes[0].data,
            dom[i].getElementsByTagName('name')[0].childNodes[0].data);
    }
}

function loadXMLDoc(url, callback){
    var the_var = null;
    $('#ajax-loader').fadeIn();
    if (window.XMLHttpRequest){
        the_var = new XMLHttpRequest();
        the_var.onreadystatechange = function () {callback(the_var)};
        the_var.open("GET", url, true);
        // send referer header
        the_var.setRequestHeader("Referer", document.location);
        the_var.send(null);
    // branch for IE/Windows ActiveX version
    }else if (window.ActiveXObject){
        isIE = true;
        the_var = new ActiveXObject("Microsoft.XMLHTTP");
        if (the_var){
            the_var.onreadystatechange = function () {callback(the_var)};
            the_var.open("GET", url, true);
            the_var.send();
        }
    }
    $('#ajax-loader').fadeOut();
    return the_var;
}

/* depth must be defined before we get here! */
update_dec(depth);