var gPopupMask = null;
var gPopupContainer = null;
var gPopFrame = null;
var gReturnFunc;
var gPopupIsShown = false;
var gDefaultPage = "/loading.html";
var gHideSelects = false;
var gReturnVal = null;

var gTabIndexes = new Array();
// Pre-defined list of tags we want to disable/enable tabbing into
var gTabbableTags = new Array("A", "BUTTON", "TEXTAREA", "INPUT", "IFRAME");

// If using Mozilla or Firefox, use Tab-key trap.
if (!document.all) {
    document.onkeypress = keyDownHandler;
}

/**
 * Initializes popup code on load.
 */
function initPopUp() {
    // Add the HTML to the body
    var theBody = document.getElementsByTagName('BODY')[0];
    var popmask = document.createElement('div');
    popmask.id = 'popupMask';
    var popcont = document.createElement('div');
    popcont.id = 'popupContainer';
    popcont.innerHTML = '' +
        '<div id="popupInner">' +
            '<div id="popupTitleBar">' +
                '<div id="popupTitle"></div>' +
                '<div id="popupControls">' +
                '<img src="close.gif" onclick="hidePopWin(false);" id="popCloseBox" />' +
                '</div>' +
            '</div>' +
            '<iframe src="' + gDefaultPage +
            '" style="width:100%;height:100%;background-color:transparent;" scrolling="auto"' +
            ' frameborder="0" allowtransparency="true" id="popupFrame" name="popupFrame" ' +
            ' width="100%" height="100%"></iframe>' +
        '</div>';
    theBody.appendChild(popmask);
    theBody.appendChild(popcont);

    gPopupMask = document.getElementById("popupMask");
    gPopupContainer = document.getElementById("popupContainer");
    gPopFrame = document.getElementById("popupFrame");

    // check to see if this is IE version 6 or lower. hide select boxes if so
    // maybe they'll fix this in version 7?
    var brsVersion = parseInt(window.navigator.appVersion.charAt(0), 10);
    if (brsVersion <= 6 && window.navigator.userAgent.indexOf("MSIE") > -1) {
        gHideSelects = true;
    }

    // Add onclick handlers to 'a' elements of class submodal or submodal-width-height
    var elms = document.getElementsByTagName('a');
    for (var i = 0; i < elms.length; i++) {
        if (elms[i].className.indexOf("submodal") == 0) {
            elms[i].onclick = function() {
                // default width and height
                var width = 400;
                var height = 200;
                // Parse out optional width and height from className
                var params = this.className.split('-');
                if (params.length == 3) {
                    width = parseInt(params[1]);
                    height = parseInt(params[2]);
                }
                showPopWin(this.href, width, height, null);
                return false;
            };
        }
    }
}
addEvent(window, "load", initPopUp);

/**
 * @argument width - int in pixels
 * @argument height - int in pixels
 * @argument url - url to display
 * @argument returnFunc - function to call when returning true from the window.
 * @argument showCloseBox - show the close box - default true
 */
function showPopWin(url, width, height, returnFunc, showCloseBox) {
    // show or hide the window close widget
    if (showCloseBox === null || showCloseBox == true) {
        document.getElementById("popCloseBox").style.display = "block";
    } else {
        document.getElementById("popCloseBox").style.display = "none";
    }
    gPopupIsShown = true;
    disableTabIndexes();
    gPopupMask.style.display = "block";
    gPopupContainer.style.display = "block";
    // calculate where to place the window on screen
    centerPopWin(width, height);

    var titleBarHeight = parseInt(document.getElementById("popupTitleBar").offsetHeight, 10);

    gPopupContainer.style.width = width + "px";
    gPopupContainer.style.height = (height+titleBarHeight) + "px";

    setMaskSize();

    // need to set the width of the iframe to the title bar width because of the dropshadow
    // some oddness was occuring and causing the frame to poke outside the border in IE6
    gPopFrame.style.width = parseInt(document.getElementById("popupTitleBar").offsetWidth, 10) + "px";
    gPopFrame.style.height = (height) + "px";

    // set the url
    gPopFrame.src = url;

    gReturnFunc = returnFunc;
    // for IE
    if (gHideSelects == true) {
        hideSelectBoxes();
    }
}

var gi = 0;
function centerPopWin(width, height) {
    if (gPopupIsShown == true) {
        if (width === null || isNaN(width)) {
            width = gPopupContainer.offsetWidth;
        }
        if (height === null) {
            height = gPopupContainer.offsetHeight;
        }

        var theBody = document.getElementsByTagName("BODY")[0];
        var scTop = parseInt(getScrollTop(), 10);
        var scLeft = parseInt(theBody.scrollLeft, 10);

        setMaskSize();

        var titleBarHeight = parseInt(document.getElementById("popupTitleBar").offsetHeight, 10);

        var fullHeight = getViewportHeight();
        var fullWidth = getViewportWidth();
	
        gPopupContainer.style.top = (scTop + ((fullHeight - (height + titleBarHeight)) / 2)) + "px";
        gPopupContainer.style.left = (scLeft + ((fullWidth - width) / 2)) + "px";
    }
}
addEvent(window, "resize", centerPopWin);
addEvent(window, "scroll", centerPopWin);
window.onscroll = centerPopWin;

/**
 * Sets the size of the popup mask.
 *
 */
function setMaskSize() {
    var theBody = document.getElementsByTagName("BODY")[0];

    var fullHeight = getViewportHeight();
    var fullWidth = getViewportWidth();
    var popHeight;

    // Determine what's bigger, scrollHeight or fullHeight / width
    if (fullHeight > theBody.scrollHeight) {
        popHeight = fullHeight;
    } else {
        popHeight = theBody.scrollHeight;
    }

    if (fullWidth > theBody.scrollWidth) {
        popWidth = fullWidth;
    } else {
        popWidth = theBody.scrollWidth;
    }

    gPopupMask.style.height = popHeight + "px";
    gPopupMask.style.width = popWidth + "px";
}

/**
 * @argument callReturnFunc - bool - determines if we call the return function specified
 * @argument returnVal - anything - return value 
 */
function hidePopWin(callReturnFunc) {
    gPopupIsShown = false;
    var theBody = document.getElementsByTagName("BODY")[0];
    theBody.style.overflow = "";
    restoreTabIndexes();
    if (gPopupMask === null) {
        return;
    }
    gPopupMask.style.display = "none";
    gPopupContainer.style.display = "none";
    if (callReturnFunc == true && gReturnFunc != null) {
        // Set the return code to run in a timeout.
        // Was having issues using with an Ajax.Request();
        gReturnVal = window.frames["popupFrame"].returnVal;
        window.setTimeout('gReturnFunc(gReturnVal);', 1);
    }
    gPopFrame.src = gDefaultPage;
    // display all select boxes
    if (gHideSelects == true) {
        displaySelectBoxes();
    }
}

// Tab key trap. iff popup is shown and key was [TAB], suppress it.
// @argument e - event - keyboard event that caused this function to be called.
function keyDownHandler(e) {
    if (gPopupIsShown && e.keyCode == 9) {
        return false;
    }
}

// For IE.  Go through predefined tags and disable tabbing into them.
function disableTabIndexes() {
    if (document.all) {
        var i = 0;
        for (var j = 0; j < gTabbableTags.length; j++) {
            var tagElements = document.getElementsByTagName(gTabbableTags[j]);
            for (var k = 0; k < tagElements.length; k++) {
                gTabIndexes[i] = tagElements[k].tabIndex;
                tagElements[k].tabIndex = "-1";
                i++;
            }
        }
    }
}

function returnRefresh() {
    window.location.reload();
}

// For IE. Restore tab-indexes.
function restoreTabIndexes() {
    if (document.all) {
        var i = 0;
        for (var j = 0; j < gTabbableTags.length; j++) {
            var tagElements = document.getElementsByTagName(gTabbableTags[j]);
            for (var k = 0 ; k < tagElements.length; k++) {
                tagElements[k].tabIndex = gTabIndexes[i];
                tagElements[k].tabEnabled = true;
                i++;
            }
        }
    }
}

/**
 * Hides all drop down form select boxes on the screen so they do not appear above the mask layer.
 * IE has a problem with wanted select form tags to always be the topmost z-index or layer
 *
 * Thanks for the code Scott!
 */
function hideSelectBoxes() {
    var x = document.getElementsByTagName("SELECT");

    for (var i = 0;x && i < x.length; i++) {
        x[i].style.visibility = "hidden";
    }
}

/**
 * Makes all drop down form select boxes on the screen visible so they do not 
 * reappear after the dialog is closed.
 * 
 * IE has a problem with wanting select form tags to always be the 
 * topmost z-index or layer.
 */
function displaySelectBoxes() {
    var x = document.getElementsByTagName("SELECT");

    for (var i=0; x && i < x.length; i++){
        x[i].style.visibility = "visible";
    }
}