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

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

	Script featured on Dynamic Drive code library Jan 24th, 06':
	http://www.dynamicdrive.com

	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 = 'images/loading.gif';
var closeButton = 'images/close.gif';

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

	var yScroll;

	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');
	var objLightbox = document.getElementById('lightbox');
	var objCaption = document.getElementById('lightboxCaption');
	var objImage = document.getElementById('lightboxImage');
	var objLoadingImage = document.getElementById('loadingImage');
	var objLightboxDetails = document.getElementById('lightboxDetails');

	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

	// center loadingImage if it exists
	if (objLoadingImage) {
		objLoadingImage.style.top = (arrayPageScroll[1]
				+ ((arrayPageSize[3] - 35 - objLoadingImage.height) / 2) + 'px');
		objLoadingImage.style.left = (((arrayPageSize[0] - 20 - objLoadingImage.width) / 2) + 'px');
		objLoadingImage.style.display = 'block';
	}

	// set height of Overlay to take up whole page and show
	objOverlay.style.height = (arrayPageSize[1] + 'px');
	objOverlay.style.display = 'block';

	// preload image
	imgPreload = new Image();

	imgPreload.onload = function() {
		objImage.src = objLink.href;

		// center lightbox and make sure that the top and left values are not
		// negative
		// and the image placed outside the viewport
		var lightboxTop = arrayPageScroll[1]
				+ ((arrayPageSize[3] - 35 - imgPreload.height) / 2);
		var lightboxLeft = ((arrayPageSize[0] - 20 - imgPreload.width) / 2);

		objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px";
		objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft
				+ "px";

		objLightboxDetails.style.width = imgPreload.width + 'px';

		if (objLink.getAttribute('title')) {
			objCaption.style.display = 'block';
			// objCaption.style.width = imgPreload.width + 'px';
			objCaption.innerHTML = objLink.getAttribute('title');
		} else {
			objCaption.style.display = 'none';
		}

		// A small pause between the image loading and displaying is required
		// with IE,
		// this prevents the previous image displaying for a short burst causing
		// flicker.
		if (navigator.appVersion.indexOf("MSIE") != -1) {
			pause(250);
		}

		if (objLoadingImage) {
			objLoadingImage.style.display = 'none';
		}
		objLightbox.style.display = 'block';

		// After image is loaded, update the overlay height as the new image
		// might have
		// increased the overall page height.
		arrayPageSize = getPageSize();
		objOverlay.style.height = (arrayPageSize[1] + 'px');

		// Check for 'x' keypress
		listenKey();

		return false;
	}

	imgPreload.src = objLink.href;

}

//
// hideLightbox()
//
function hideLightbox() {
	// get objects
	objOverlay = document.getElementById('overlay');
	objLightbox = document.getElementById('lightbox');

	// hide lightbox and overlay
	objOverlay.style.display = 'none';
	objLightbox.style.display = 'none';

	// disable keypress listener
	document.onkeypress = '';
}

//
// 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
	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;
			}
		}
	}

	// the rest of this code inserts html at the top of the page that looks like
	// this:
	//
	// <div id="overlay">
	// <a href="#" onclick="hideLightbox(); return false;"><img
	// id="loadingImage" /></a>
	// </div>
	// <div id="lightbox">
	// <a href="#" onclick="hideLightbox(); return false;" title="Click anywhere
	// to close image">
	// <img id="closeButton" />
	// <img id="lightboxImage" />
	// </a>
	// <div id="lightboxDetails">
	// <div id="lightboxCaption"></div>
	// <div id="keyboardMsg"></div>
	// </div>
	// </div>

	var objBody = document.getElementsByTagName("body").item(0);

	// 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();

	// preload and create loader image
	var imgPreloader = new Image();

	// if loader image found, create link to hide lightbox and create
	// loadingimage
	imgPreloader.onload = function() {

		var objLoadingImageLink = document.createElement("a");
		objLoadingImageLink.setAttribute('href', '#');
		objLoadingImageLink.onclick = function() {
			hideLightbox();
			return false;
		}
		objOverlay.appendChild(objLoadingImageLink);

		var objLoadingImage = document.createElement("img");
		objLoadingImage.src = loadingImage;
		objLoadingImage.setAttribute('id', 'loadingImage');
		objLoadingImage.style.position = 'absolute';
		objLoadingImage.style.zIndex = '150';
		objLoadingImageLink.appendChild(objLoadingImage);

		imgPreloader.onload = function() {
		}; // clear onLoad, as IE will flip out w/animated gifs

		return false;
	}

	imgPreloader.src = loadingImage;

	// 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);

	// create link
	var objLink = document.createElement("a");
	objLink.setAttribute('href', '#');
	objLink.setAttribute('title', 'Click to close');
	objLink.onclick = function() {
		hideLightbox();
		return false;
	}
	objLightbox.appendChild(objLink);

	// preload and create close button image
	var imgPreloadCloseButton = new Image();

	// if close button image found,
	imgPreloadCloseButton.onload = function() {

		var objCloseButton = document.createElement("img");
		objCloseButton.src = closeButton;
		objCloseButton.setAttribute('id', 'closeButton');
		objCloseButton.style.position = 'absolute';
		objCloseButton.style.zIndex = '200';
		objLink.appendChild(objCloseButton);

		return false;
	}

	imgPreloadCloseButton.src = closeButton;

	// create image
	var objImage = document.createElement("img");
	objImage.setAttribute('id', 'lightboxImage');
	objLink.appendChild(objImage);

	// create details div, a container for the caption and keyboard message
	var objLightboxDetails = document.createElement("div");
	objLightboxDetails.setAttribute('id', 'lightboxDetails');
	objLightbox.appendChild(objLightboxDetails);

	// create caption
	var objCaption = document.createElement("div");
	objCaption.setAttribute('id', 'lightboxCaption');
	objCaption.style.display = 'none';
	objLightboxDetails.appendChild(objCaption);

	// create keyboard message
	var objKeyboardMsg = document.createElement("div");
	objKeyboardMsg.setAttribute('id', 'keyboardMsg');
	objKeyboardMsg.setAttribute('class', 'keyboardMsg');
	objKeyboardMsg.innerHTML = 'Zum Schliessen auf das Bild klicken oder X';
	objLightboxDetails.appendChild(objKeyboardMsg);

}

//
// addLoadEvent()
// Adds event to window.onload without overwriting currently assigned onload
// functions.
// Function found at Simon Willison's weblog - http://simon.incutio.com/
//
function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function() {
			oldonload();
			func();
		}
	}

}

addLoadEvent(initLightbox); // run initLightbox onLoad