/* 
 * General functions, shared by most different scripts and elements.
 */

// Object literal version of a timer script, can be used to benchmark script running time.

var timeDiff  =  {
    setStartTime:function (){
        d = new Date();
        time  = d.getTime();
    },

    getDiff:function (){
        d = new Date();
        return (d.getTime()-time);
    }
}

// Check if a certain HTMLElement has a given classname
function hasClass(ele,cls) {
    if (ele.className)
        return ele.className.match(new RegExp('(\\s|^)'+cls+'(\\s|$)'));
    
}

// Add a given classname to an HTMLElement
function addClass(ele,cls) {
    if (!this.hasClass(ele,cls)) ele.className += " "+cls;
}

// Remove a given class from an HTMLElement
function removeClass(ele,cls) {
    if (hasClass(ele,cls)) {
        var reg = new RegExp('(\\s|^)'+cls+'(\\s|$)');
        ele.className=ele.className.replace(reg,' ');
    }
}

// General function to handle AJAX functionality.
// Specify the request string, url to send to, the function to execute on response and whether to run in the background or wait for a response before continuing.
function newAjaxRequest(c, u, cb, async) {
    var xml;
    var content = c;    //an array of strings, in "key=value"  format.
    // assign a compatible request format
    if (window.XMLHttpRequest) {    //Not IE5, IE6
        xml = new XMLHttpRequest();
    }
    else {                          //IE5, IE6
        xml = new ActiveXObject("Microsoft.XMLHTTP");
    }
    // subscribe the callback function to a response event
    xml.onreadystatechange = function() {
        xml.responseText = "Processing...";
        if (xml.readyState == 4 && xml.status == 200) {
            cb(xml);
        }
    };
    // initialize XMLRequest
    xml.open("POST", u, async);
    xml.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    var contentString = "";
    //iterate through parameters passed in variable c
    if (typeof(content)=='object'&&(input instanceof Array)) {    // parameters were passed as an array of key=value strings
        for (var i = 0; i < content.length; i++) {
            contentString += content[i];
            if (i != (content.length - 1)) {
                contentString += "&";
            }
        }
    }
    else { // single parameter or string already formatted by calling function
        contentString = content;
    }
    // finally send the formatted request
    xml.send(contentString);
}

// Function that handles updating of info panel via AJAX getInfo.php. Currently operates on HTML to paste into #infoPanelContent, should eventually involve JSON arrays, to have more control over formatting.
function ajaxInfoRequest(uid, el, type) {
    // Info panel update.
    
    var c = "uid="+uid;
    c += "&type="+type;
    var u = "getInfo.php";
    newAjaxRequest(c, u, function(result) {
        el.innerHTML = result.responseText;
    }, true);
}

// Function to save the object currently being edited.
// !! Still needs to be generalized !!
function saveObject (confirmSave) {
    var answer = false;
    if (confirmSave==true) {
        answer = confirm("Save changes to pipeline?");
    }
    else {
        answer = true;
    }
    
    
    if (answer == true) {
        var pipeline = document.getElementById("pipelineStringField").value;
        pipeline = pipeline.slice(0, pipeline.length - 1);
        var types = document.getElementById("pipelineTypeField").value;
        types = types.slice(0, types.length - 1);
        var session = document.getElementById("sessionField").value;
        var requestString = "uids="+pipeline+"&types="+types+"&sessionUid="+session;
        console.log(requestString);
        
        
        var success;
        newAjaxRequest(requestString, "savesession.php", function(result){
            success = result.responseText;
        }, true);
        console.log(success);
    }
}

// Convert a string to an array and remove any empty items (from trailing commas)
function stringToArray(s, c) {
    var a = s.split(c);
    for (var i = 0; i < a.length; i++) {    // remove empty items
        if (a[i] == "") {
            a.splice(i, 1);
            i--;
        }
    }
    return a;
}

// Convert an array to a string, separated by character "c"
function arrayToString(a, c) {
    var s = "";
    for (var i = 0; i < a.length; i++) {
        if (a[i] != "") {
            s += a[i]+c;
        }
    }
    return s;
}

// Remove all newlines, carriage returns and tabs from a given string
function removeNL(s){ 
    return s.replace(/[\n\r\t]/g,""); 
}

// Shorthand for document.createElement, because that pops up about three times every line of the main program
function ce(s) {
    return document.createElement(s);
}

// Shorthand for document.getElementById, same reason as above
function ge(s) {
    return document.getElementById(s);
}

// Function for getting the absolute position of the top left corner of an element, relative to the window
function getPos(element) {
    var posX = posY = 0;
    if (element.offsetParent) {
        do {
            posX += element.offsetLeft;
            posY += element.offsetTop;
        } while (element = element.offsetParent);
    }
    
    var result = {
        X: posX,
        Y: posY
    }
    return result;
}

// TODO: this is a broken version of the above function, to be used during the demo ONLY! (Else the dropdown menu does not work correctly...
// Fix/remove as soon as possible
function getWrongPos(element) {
    var posX = posY = 0;
    if (element.offsetParent) {
        do {
            posX += element.offsetLeft;
            posY += element.offsetTop;
        } while (element = element.offSetParent);
    }
    
    var result = {
        X: posX,
        Y: posY
    }
    return result;
}

// Returns the computed width of an element
function getWidth(element) {
    var width = 0;
    if (element.offsetWidth) {
        width = element.offsetWidth;
    }
    
    return width;
}

// Returns the computer size of an element
function getSize(element) {
    var size = {
        X: null,
        Y: null
    }
    if (element.offsetWidth) {
        size.X = element.offsetWidth;
        size.Y = element.offsetHeight;
    }
    
    return size;
}

// Drop down menu implementation. Supports three levels: Base button, 1st level categories, and 2nd level links
// TODO: getPos functie werkte eerst niet goed, menu offset is nog beetje whack. Betere manier van dropdown menu vinden en voor nu even de getPos functie stuk laten?
function DDMenu() {
    // Initialize function, setting all needed variables.
    var instance = this;
    this.closeTimer = 0;
    this.ddMenuItem = null;
    this.timeout = 350;
    this.visible = false;
    this.menuElement = null;
    this.parentButton = null
    
    this.Init = function(id1, id2) {    
        instance.menuElement = ge(id1);
        instance.parentButton = ge(id2);
    }
    
    this.SetCloseTimer = function() {
        //debugger;
        instance.closeTimer = window.setTimeout(instance.Close, instance.timeout);
    }
    
    this.Close = function() {
        if (instance.ddMenuItem) {
            instance.ddMenuItem.style.visibility = "hidden";
        }
        instance.Toggle();
        
    }
    
    this.CancelCloseTimer = function() {
        if (instance.closeTimer) {
            window.clearTimeout(instance.closeTimer);
            instance.closeTimer = null;
        }
    }
    
    this.Open = function(id) {
        instance.CancelCloseTimer();
        if (instance.ddMenuItem) {
            instance.ddMenuItem.style.visibility = "hidden";
        }
        
        instance.ddMenuItem = ge(id);
        instance.ddMenuItem.style.visibility = "visible";
        var parentPos = getWrongPos(instance.ddMenuItem.parentNode);
        var parentWidth = getWidth(instance.ddMenuItem.parentNode);
        instance.ddMenuItem.style.left = (parentPos.X + parentWidth)+"px";
        instance.ddMenuItem.style.top = parentPos.Y+"px";
        
    }
    
    this.Toggle = function() {
        //debugger;
        if (instance.visible) {
            // Hide the menu
            instance.menuElement.style.visibility = "hidden";
            instance.parentButton.className = "";
            instance.visible = false;
        }
        else{
            //Show the menu
            if (instance.menuElement) {
                instance.menuElement.style.visibility = "visible";
                instance.parentButton.className = "down";
            }
            instance.visible = true;
        }
    }
}

function manualEventFire(element, rawEvent) {
    // Attempts to fire a raw DOM event on an element
    
    try {
        element = document.getElementById(element);
        if (element.fireEvent) {
            element.fireEvent("on"+rawEvent.type, rawEvent);
            return true;
        }
        else if (element.dispatchEvent) {
            element.dispatchEvent(rawEvent);
            return true;
        }
    } catch (e) {
    }
    return false;
}