/*
	Lightbox JS: Fullsize Image Overlays 
	by Lokesh Dhakar - http://www.huddletogether.com

	For more information on this script, visit:
	http://huddletogether.com/projects/lightbox/

	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
	(basically, do anything you want, just leave my name and link)
	
	Table of Contents
	-----------------
	Configuration
	
	Functions
	- getPageScroll()
	- getPageSize()
	- pause()
	- getKey()
	- listenKey()
	- showLightbox()
	- hideLightbox()
	- initLightbox()
	- addLoadEvent()
	
	Function Calls
	- addLoadEvent(initLightbox)

*/

//
// Configuration
//

// If you would like to use a custom loading image or close button reference them in the next two lines.
var loadingImage = REVVER.jsApiURL + 'lightbox/loading.gif';
var closeButton = REVVER.jsApiURL + 'lightbox/close.gif';

//
// getPageScroll()
// Returns array with x,y page scroll values.
// Core code from - quirksmode.org
//
function getPageScroll(){

	var yScroll;
	// Note, self is this window
	if (self.pageYOffset) {
		yScroll = self.pageYOffset;
	} else if (document.documentElement && document.documentElement.scrollTop){	 // Explorer 6 Strict
		yScroll = document.documentElement.scrollTop;
	} else if (document.body) {// all other Explorers
		yScroll = document.body.scrollTop;
	}

	arrayPageScroll = new Array('',yScroll) 
	return arrayPageScroll;
}



//
// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.org
// Edit for Firefox by pHaez
//
function getPageSize(){

	var xScroll, yScroll;
	
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = document.body.scrollWidth;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	
	var windowWidth, windowHeight;
	if (self.innerHeight) {	// all except Explorer
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	
	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = windowWidth;
	} else {
		pageWidth = xScroll;
	}


	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
	return arrayPageSize;
}

//
// pause(numberMillis)
// Pauses code execution for specified time. Uses busy code, not good.
// Code from http://www.faqts.com/knowledge_base/view.phtml/aid/1602
//
function pause(numberMillis) {
	var now = new Date();
	var exitTime = now.getTime() + numberMillis;
	while (true) {
		now = new Date();
		if (now.getTime() > exitTime)
			return;
	}
}

//
// getKey(key)
// Gets keycode. If 'x' is pressed then it hides the lightbox.
//

function getKey(e){
	if (e == null) { // ie
		keycode = event.keyCode;
	} else { // mozilla
		keycode = e.which;
	}
	key = String.fromCharCode(keycode).toLowerCase();
	
	if(key == 'x'){ hideLightbox(); }
}


//
// listenKey()
//
function listenKey () {	document.onkeypress = getKey; }

//
// showLightbox()
// Preloads images. Pleaces new image in lightbox then centers and displays.
//
function showLightbox(objLink)
{
	// prep objects
	var objOverlay = document.getElementById('overlay');                   // The main overlay div
	var objLightbox = document.getElementById('lightbox');                 // This appears above the overlay
	var arrayPageSize = getPageSize();     // (pageWidth,pageHeight,windowWidth,windowHeight) 
	var pageWidth = arrayPageSize[0];
	var pageHeight = arrayPageSize[1];
	var winWidth = arrayPageSize[2];
	var winHeight = arrayPageSize[3];
	var arrayPageScroll = getPageScroll();
	var yScroll = arrayPageScroll[1];

	// set height of Overlay to take up whole page and show
	objOverlay.style.height = (pageHeight + 'px');
	objOverlay.style.display = 'block';

	thisWidth = objLink.getAttribute("lightBoxWidth") || 680;
	thisHeight = objLink.getAttribute("lightBoxHeight") || 420;
	var thisTop = yScroll + ((winHeight - 35 - thisHeight) / 2);
	var thisLeft = ((pageWidth - 20 - thisWidth) / 2);
	objLightbox.style.width = (thisWidth + 'px');
	objLightbox.style.height = (thisHeight + 'px');
	objLightbox.style.top = (thisTop + 'px');
	objLightbox.style.left = ( thisLeft + 'px');
	objLightbox.style.display = 'block';

    hideObjects();
	var elementToRender = eval(objLink.getAttribute("render"));
    objLightbox.appendChild(elementToRender);

    return false;
}

//
// hideLightbox()
//
function hideLightbox()
{
    initLightbox();
    showObjects();
}

//
// initLightbox()
// Function runs on window load, going through link tags looking for rel="lightbox".
// These links receive onclick events that enable the lightbox display for their targets.
// The function also inserts html markup at the top of the page which will be used as a
// container for the overlay pattern and the inline image.
//
function initLightbox()
{
	if (!document.getElementsByTagName){ return; }
	var anchors = document.getElementsByTagName("a");

	// loop through all anchor tags, and assign this onclick to any rel="lightbox"
	for (var i=0; i<anchors.length; i++){
		var anchor = anchors[i];

		if (anchor.getAttribute("href") && (anchor.getAttribute("rel") == "lightbox")){
			anchor.onclick = function () {showLightbox(this); return false;}
		}
	}

	var objBody = document.getElementsByTagName("body").item(0);
	// Remove any current overlay and lightbox divs.
    var elem = document.getElementById("overlay");
    if (elem)
        elem.parentNode.removeChild(elem);
    elem = document.getElementById("lightbox");
    if (elem)
        elem.parentNode.removeChild(elem);
	
	// Create overlay div and hardcode some functional styles (aesthetic styles are in CSS file)
	var objOverlay = document.createElement("div");
	objOverlay.setAttribute('id','overlay');
	objOverlay.onclick = function () {hideLightbox(); return false;}
	objOverlay.style.display = 'none';
	objOverlay.style.position = 'absolute';
	objOverlay.style.top = '0';
	objOverlay.style.left = '0';
	objOverlay.style.zIndex = '90';
 	objOverlay.style.width = '100%';
	objBody.insertBefore(objOverlay, objBody.firstChild);
	
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

	// Create lightbox div, same note about styles as above
	var objLightbox = document.createElement("div");
	objLightbox.setAttribute('id','lightbox');
	objLightbox.style.display = 'none';
	objLightbox.style.position = 'absolute';
	objLightbox.style.zIndex = '100';
	objBody.insertBefore(objLightbox, objOverlay.nextSibling);
}

function hideObjects() {
    var _o = document.getElementsByTagName("object");
    var _l = _o.length;
    for (var i = 0; i < _l; i++) {
        _o[i].style.visibility = "hidden";
    }
    _o = document.getElementsByTagName("embed");
    _l = _o.length;
    for (i = 0; i < _l; i++) {
        _o[i].style.visibility = "hidden";
    }
}

function showObjects() {
    var _o = document.getElementsByTagName("object");
    var _l = _o.length;
    for (var i = 0; i < _l; i++) {
        _o[i].style.visibility = "visible";
    }
    _o = document.getElementsByTagName("embed");
    _l = _o.length;
    for (i = 0; i < _l; i++) {
        _o[i].style.visibility = "visible";
    }
}