//<![CDATA[

var isMozilla;
var xmlhttp;
var sessionID;
var checkStatusID;
var progressBarInfo = ['add', 'delete'];

// for Mozilla, etc.
if (window.XMLHttpRequest) {
    isMozilla = true;
}
// for IE
else if (window.ActiveXObject) {
    isMozilla = false;
}
// TODO - otherwise, alert and abort.

function getDOMText(nodes) {
    var toReturn = "";
    for (var i = 0; i < nodes.length; i++) {
        if (nodes[i].nodeType == Node.TEXT_NODE) {
            toReturn = toReturn + nodes[i].nodeValue;
        }
    }
    return toReturn;
}

function clearAll(elem) {
    clearAllStarting(elem, 0);
}

function clearAllButFirstElement(elem) {
    clearAllStarting(elem, 1);
}

function clearAllAfterFirstElementType(elem, elemType) {
    if (!elem || elem.childNodes.length == 0) {
        return;
    }
    var curChild = elem.childNodes[0];
    while (curChild != null && curChild.nodeName.toUpperCase() != elemType.toUpperCase()) {
        curChild = curChild.nextSibling;
    }
    if (curChild != null) {
        clearAllStartingNode(elem, curChild.nextSibling);
    }
}

function clearAllStarting(elem, starting) {
    if (!elem || (elem.childNodes.length < starting)) {
        return;
    }
    // Calling clearAllStartingNode(elem, elem.childNodes[starting]) doesn''t
    // work - the startingNode gets set to void for some reason.
    var curChild = elem.childNodes[starting];
    var nextChild = null;
    while (curChild != null) {
        nextChild = curChild.nextSibling;
        elem.removeChild(curChild);
        curChild = nextChild;
    }
}

function clearAllStartingNode(elem, startingNode) {
    var curChild = startingNode;
    var nextChild = null;
    while (curChild != null) {
        nextChild = curChild.nextSibling;
        elem.removeChild(curChild);
        curChild = nextChild;
    }
}

function setTextStatus(newStatus) {
    var curTextStatus = document.getElementById("textStatus")
    clearAll(curTextStatus);
    curTextStatus.appendChild(document.createTextNode(newStatus));
}

function appendTextStatus(appendedStatus) {
    var curTextStatus = document.getElementById("textStatus")
    var currentStatus = getDOMText(curTextStatus.childNodes);
    currentStatus += appendedStatus;
    clearAll(curTextStatus);
    curTextStatus.appendChild(document.createTextNode(currentStatus));
}

function gotStatus() {
    if (xmlhttp.readyState == 4) {
        if (xmlhttp.status == 200) {
            var response = xmlhttp.responseXML.documentElement;
            var isDone = (response.getElementsByTagName("done").length > 0);
            var isError = (response.getElementsByTagName("errors").length > 0);
            var textStatusNew = getDOMText(response.getElementsByTagName("text")[0].childNodes);
            var success = 0;
            if (isDone) {
                var successValue = getDOMText(response.getElementsByTagName("success")[0].childNodes);
                success = parseInt(successValue);
            }
            if (isError) {
                if (isDone && (success == 0)) {
                    textStatusNew = "ERROR: " + getDOMText(response.getElementsByTagName("errors")[0].childNodes) + "!  " + textStatusNew;
                }
            }
            setTextStatus(textStatusNew);
            var setBar = false;
            for (var tag in progressBarInfo) {
                var elem = response.getElementsByTagName(progressBarInfo[tag])[0];
                if (!setBar && elem) {
                    var total = parseInt(getDOMText(elem.getElementsByTagName("total")[0].childNodes));
                    var current = parseInt(getDOMText(elem.getElementsByTagName("current")[0].childNodes));
                    if (total > 0 && current > 0) {
                        setBar = true;
                        setProgressBarVisibility("progressBar", true);
                        setProgressBar("progressBar", (current*1.0/total));
                        if (!isDone) {
                            appendTextStatus(" (" + current + "/" + total + ")");
                        }
                    }
                }
            }
            // Do setInterval again if we''re not done.
            if (!isDone) {
                checkStatusID = setInterval(checkStatus, 2000);
            } else {
                var successTags = response.getElementsByTagName("success");
                var isSuccess = (successTags.length > 0) && (parseInt(getDOMText(successTags[0].childNodes)) == 1);
                if (isSuccess) {
                   var numDeletedCurrent = parseInt(getDOMText(response.getElementsByTagName("delete")[0].getElementsByTagName("current")[0].childNodes));
                   var numDeletedTotal = parseInt(getDOMText(response.getElementsByTagName("delete")[0].getElementsByTagName("total")[0].childNodes));
                   var numAddedCurrent = parseInt(getDOMText(response.getElementsByTagName("add")[0].getElementsByTagName("current")[0].childNodes));
                   var numAddedTotal = parseInt(getDOMText(response.getElementsByTagName("add")[0].getElementsByTagName("total")[0].childNodes));
                   appendTextStatus(" (" + numDeletedCurrent + "/" + numDeletedTotal + " events deleted, " + numAddedCurrent + "/" + numAddedTotal + " events added)");
                }
                setProgressBarVisibility("progressBar", false);
            }
        }
    }
}

function checkStatus() {
    clearInterval(checkStatusID);
    doRequest(checkStatusScriptName + "?session_id=" + sessionID, true, gotStatus, "GET", null);
}

function doRequest(url, async, callback, method, postData) {
    if (isMozilla) {
        xmlhttp = new XMLHttpRequest();
        // http://www.onlamp.com/pub/a/onlamp/2005/05/19/xmlhttprequest.html
        // Some versions of mozilla lock up without this, apparently.
        if (xmlhttp.overrideMimeType) {
            xmlhttp.overrideMimeType('text/xml');
        }
    } else {
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
    if (async) {
        xmlhttp.onreadystatechange = callback;
    }
    method = method.toUpperCase();
    xmlhttp.open(method, url, async);
    if (method == "GET") {
        if (isMozilla) {
            xmlhttp.send(null);
        } else {
            xmlhttp.send();
        }
    } else {
        // We''re doing POST.
        xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
        xmlhttp.send(postData);
    }
    if (!async) {
        callback();
    }
}

function initializeProgressBar(id, width, height, color, backgroundColor) {
    var div1 = document.createElement("div");
    div1.style.width = width + "px";
    div1.style.height = height + "px";
    div1.style.backgroundColor = backgroundColor;
    div1.style.border = "1px solid #0000ff";
    var div2 = document.createElement("div");
    div2.style.width = "0px";
    div2.style.height = height + "px";
    div2.style.backgroundColor = color;
    div1.appendChild(div2);
    var container = document.getElementById(id);
    container.appendChild(div1);
}

function setProgressBar(barId, fraction) {
    var container = document.getElementById(barId);
    var div1 = container.childNodes[0];
    var div2 = div1.childNodes[0];
    var div1width = parseInt(div1.style.width.substr(0, div1.style.width.length - 2));
    div2.style.width = (fraction * div1width) + "px";
}

function setProgressBarVisibility(barId, visible) {
    var container = document.getElementById(barId);
    container.style.display = ((visible) ? "" : "none");
}

function setSessionId(id) {
    sessionID = id;
    setProgressBarVisibility("progressBar", false);
    setTextStatus("Uploading file...");
    checkStatusID = setInterval(checkStatus, 1000);
}

initializeProgressBar("progressBar", 200, 25, "#333333", "#eeeeee");

//]]>