/**
 * jQuery Lightbox
 * Version 0.5 - 11/29/2007
 * @author Warren Krewenki
 *
 * Changes by:
 * @author Krzysztof Kotowicz <koto at webworkers dot pl>:
 *  - bugfix: multiple instances of Lightbox galleries allowed
 *    (using opts variable instead of $.fn.lightbox.defaults)
 *  - bugfix: use var for local variables in a few functions
 *  - added support for navbarOnTop setting
 *  - added support for displayTitle setting
 *  - added support for slideNavBar setting (with slideNavBarSpeed)
 *  - added support for displayHelp setting
 *  - added support for fitToScreen setting (ported Lightbox VinDSL hack)
 *    (see http://www.huddletogether.com/forum/comments.php?DiscussionID=307)
 *  - plugin now uses jQuery.width() and jQuery.height()
 *  - removed eval() calls
 *  - removed destroyElement - uses jQuery.remove()
 *  - use of prevLinkText, nextLinkText and help
 *  - all strings are now placed in opts.strings to allow for customization/translation
 *
 * Based on Lightbox 2 by Lokesh Dhakar (http://www.huddletogether.com/projects/lightbox2/)
 * Originally written to make use of the Prototype framework, and Script.acalo.us, now altered to use jQuery.
 *
 **/
(function($){
var opts;
$.fn.lightbox = function(options){
	// build main options
	opts = $.extend({}, $.fn.lightbox.defaults, options);
	// initalize the lightbox
	$.fn.lightbox.initialize();
	return this.each(function(){
	$(this).click(function(){
		$(this).lightbox.start(this);
		return false;
	});
	});
};
// lightbox functions
$.fn.lightbox.initialize = function(){
	$('#overlay').remove();
	$('#lightbox').remove();
	opts.inprogress = false;
	var outerImage = '<div id="outerImageContainer"><div id="imageContainer"><img id="lightboxImage"><div id="hoverNav"><a href="javascript://" title="' + opts.strings.prevLinkTitle + '" id="prevLink"></a><a href="javascript://" id="nextLink" title="' + opts.strings.nextLinkTitle + '"></a></div><div id="loading"><a href="javascript://" id="loadingLink"><img src="'+opts.fileLoadingImage+'"></a></div></div></div>';
	var imageData = '<div id="imageDataContainer" class="clearfix"><div id="imageData"><div id="imageDetails"><span id="caption"></span></div><div id="bottomNav"><a href="javascript://" id="bottomNavClose" title="' + opts.strings.closeTitle + '"><img src="'+opts.fileBottomNavCloseImage+'"></a><span id="numberDisplay"></span>';
	if (opts.displayHelp)
	imageData += '<span id="helpDisplay">' + opts.strings.help + '</span>';
	imageData += '</div></div></div>';
	var string;
	if (opts.navbarOnTop) {
	  string = '<div id="overlay"></div><div id="lightbox">' + imageData + outerImage + '</div>';
	  $("body").append(string);
	  $("#imageDataContainer").addClass('ontop');
	} else {
	  string = '<div id="overlay"></div><div id="lightbox">' + outerImage + imageData + '</div>';
	  $("body").append(string);
	}
	$("#overlay").click(function(){ $.fn.lightbox.end(); }).hide();
	$("#lightbox").click(function(){ $.fn.lightbox.end();}).hide();
	$("#loadingLink").click(function(){ $.fn.lightbox.end(); return false;});
	$("#bottomNavClose").click(function(){ $.fn.lightbox.end(); return false; });
	$('#outerImageContainer').width(opts.widthCurrent).height(opts.heightCurrent);
	$('#imageDataContainer').width(opts.widthCurrent);
};
$.fn.lightbox.getPageSize = function(){
	var xScroll, yScroll;
	if (window.innerHeight && window.scrollMaxY) {
	xScroll = window.innerWidth + window.scrollMaxX;
	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
	if(document.documentElement.clientWidth){
		windowWidth = document.documentElement.clientWidth;
	} else {
		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 = xScroll;
	} else {
	pageWidth = windowWidth;
	}
	var arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight);
	return arrayPageSize;
};
$.fn.lightbox.getPageScroll = function(){
	var xScroll, yScroll;
	if (self.pageYOffset) {
	yScroll = self.pageYOffset;
	xScroll = self.pageXOffset;
	} else if (document.documentElement && document.documentElement.scrollTop){  // Explorer 6 Strict
	yScroll = document.documentElement.scrollTop;
	xScroll = document.documentElement.scrollLeft;
	} else if (document.body) {// all other Explorers
	yScroll = document.body.scrollTop;
	xScroll = document.body.scrollLeft;
	}
	var arrayPageScroll = new Array(xScroll,yScroll);
	return arrayPageScroll;
};
$.fn.lightbox.pause = function(ms){
	var date = new Date();
	var curDate = null;
	do{curDate = new Date();}
	while( curDate - date < ms);
};
$.fn.lightbox.start = function(imageLink){
	$("select, embed, object").hide();
	var arrayPageSize = $.fn.lightbox.getPageSize();
	$("#overlay").hide().css({width: '100%', height: arrayPageSize[1]+'px', opacity : opts.overlayOpacity}).fadeIn();
	opts.imageArray = [];
	imageNum = 0;
	var anchors = document.getElementsByTagName( imageLink.tagName);
	// if image is NOT part of a set..
	if(!imageLink.rel || (imageLink.rel == '')){
	// add single image to Lightbox.imageArray
	opts.imageArray.push(new Array(imageLink.href, opts.displayTitle ? imageLink.title : ''));
	} else {
	// if image is part of a set..
	$("a").each(function(){
		if(this.href && (this.rel == imageLink.rel)){
		opts.imageArray.push(new Array(this.href, opts.displayTitle ? this.title : ''));
		}
	})
	for(i = 0; i < opts.imageArray.length; i++){
		for(j = opts.imageArray.length-1; j>i; j--){
		if(opts.imageArray[i][0] == opts.imageArray[j][0]){
			opts.imageArray.splice(j,1);
		}
		}
	}
	while(opts.imageArray[imageNum][0] != imageLink.href) { imageNum++;}
	}
	// calculate top and left offset for the lightbox
	var arrayPageScroll = $.fn.lightbox.getPageScroll();
	var lightboxTop = arrayPageScroll[1] + (arrayPageSize[3] / 10);
	var lightboxLeft = arrayPageScroll[0];
	$('#lightbox').css({top: lightboxTop+'px', left: lightboxLeft+'px'}).show();
	if (!opts.slideNavBar)
	$('#imageData').hide();
	$.fn.lightbox.changeImage(imageNum);
};
$.fn.lightbox.changeImage = function(imageNum){
	if(opts.inprogress == false){
	opts.inprogress = true;
	opts.activeImage = imageNum;// update global var
	// hide elements during transition
	$('#loading').show();
	$('#lightboxImage').hide();
	$('#hoverNav').hide();
	$('#prevLink').hide();
	$('#nextLink').hide();
	if (opts.slideNavBar) { // delay preloading image until navbar will slide up
		// $('#imageDataContainer').slideUp(opts.navBarSlideSpeed, $.fn.doChangeImage);
		$('#imageDataContainer').hide();
		$('#imageData').hide();
		$.fn.doChangeImage();
	} else {
	    $.fn.doChangeImage();
	}
	}
};
$.fn.doChangeImage = function(){
	imgPreloader = new Image();
	// once image is preloaded, resize image container
	imgPreloader.onload=function(){
	    var newWidth = imgPreloader.width;
	    var newHeight = imgPreloader.height;
	if (opts.fitToScreen) {
	        var arrayPageSize = $.fn.lightbox.getPageSize();
		var ratio;
		var initialPageWidth = arrayPageSize[2] - 2 * opts.borderSize;
		var initialPageHeight = arrayPageSize[3] - 200;
		if (imgPreloader.height > initialPageHeight)
		{
		newWidth = parseInt((initialPageHeight/imgPreloader.height) * imgPreloader.width);
		newHeight = initialPageHeight;
		}
		else if (imgPreloader.width > initialPageWidth)
		{
		newHeight = parseInt((initialPageWidth/imgPreloader.width) * imgPreloader.height);
		newWidth = initialPageWidth;
		}
	}
	$('#lightboxImage').attr('src', opts.imageArray[opts.activeImage][0])
			   .width(newWidth).height(newHeight);
	$.fn.lightbox.resizeImageContainer(newWidth, newHeight);
	}
	imgPreloader.src = opts.imageArray[opts.activeImage][0];
}
$.fn.lightbox.end = function(){
	$.fn.lightbox.disableKeyboardNav();
	$('#lightbox').hide();
	$('#overlay').fadeOut();
	$('select, object, embed').show();
};
$.fn.lightbox.preloadNeighborImages = function(){
	if((opts.imageArray.length - 1) > opts.activeImage){
	preloadNextImage = new Image();
	preloadNextImage.src = opts.imageArray[opts.activeImage + 1][0];
	}
	if(opts.activeImage > 0){
	preloadPrevImage = new Image();
	preloadPrevImage.src = opts.imageArray[opts.activeImage - 1][0];
	}
};
$.fn.lightbox.keyboardAction = function(e){
	if (e == null) { // ie
	var keycode = event.keyCode;
	var escapeKey = 27;
	} else { // mozilla
	var keycode = e.keyCode;
	var escapeKey = e.DOM_VK_ESCAPE;
	}
	var key = String.fromCharCode(keycode).toLowerCase();
	if((key == 'x') || (key == 'o') || (key == 'c') || (keycode == escapeKey)){ // close lightbox
	$.fn.lightbox.end();
	} else if((key == 'p') || (keycode == 37)){ // display previous image
	if(opts.activeImage != 0){
		$.fn.lightbox.disableKeyboardNav();
		$.fn.lightbox.changeImage(opts.activeImage - 1);
	}
	} else if((key == 'n') || (keycode == 39)){ // display next image
	if(opts.activeImage != (opts.imageArray.length - 1)){
		$.fn.lightbox.disableKeyboardNav();
		$.fn.lightbox.changeImage(opts.activeImage + 1);
	}
	}
};
$.fn.lightbox.resizeImageContainer = function(imgWidth, imgHeight){
	// get current width and height
	opts.widthCurrent = document.getElementById('outerImageContainer').offsetWidth;
	opts.heightCurrent = document.getElementById('outerImageContainer').offsetHeight;
	// get new width and height
	var widthNew = (imgWidth  + (opts.borderSize * 2));
	var heightNew = (imgHeight  + (opts.borderSize * 2));
	// scalars based on change from old to new
	opts.xScale = ( widthNew / opts.widthCurrent) * 100;
	opts.yScale = ( heightNew / opts.heightCurrent) * 100;
	// calculate size difference between new and old image, and resize if necessary
	wDiff = opts.widthCurrent - widthNew;
	hDiff = opts.heightCurrent - heightNew;
	$('#imageDataContainer').animate({width: widthNew},opts.resizeSpeed,'linear');
	$('#outerImageContainer').animate({width: widthNew},opts.resizeSpeed,'linear',function(){
	$('#outerImageContainer').animate({height: heightNew},opts.resizeSpeed,'linear',function(){
		$.fn.lightbox.showImage();
	});
	});
	// if new and old image are same size and no scaling transition is necessary,
	// do a quick pause to prevent image flicker.
	if((hDiff == 0) && (wDiff == 0)){
	if (jQuery.browser.msie){ $.fn.lightbox.pause(250); } else { $.fn.lightbox.pause(100);}
	}
	$('#prevLink').height(imgHeight);
	$('#nextLink').height(imgHeight);
};
$.fn.lightbox.showImage = function(){
	$('#loading').hide();
	$('#lightboxImage').fadeIn("fast");
	$.fn.lightbox.updateDetails();
	$.fn.lightbox.preloadNeighborImages();
	opts.inprogress = false;
};
$.fn.lightbox.updateDetails = function(){
	if(opts.imageArray[opts.activeImage][1]){
	$('#caption').html(opts.imageArray[opts.activeImage][1]).show();
	}
	// if image is part of set display 'Image x of x'
	if(opts.imageArray.length > 1){
	var nav_html ="";
	var anzahl;
	anzahl = "<br>" +opts.strings.image + (opts.activeImage + 1) + opts.strings.of + opts.imageArray.length;
	//nav_html = opts.strings.image + (opts.activeImage + 1) + opts.strings.of + opts.imageArray.length;
	// display previous / next text links
	if ((opts.activeImage) > 0) {
		nav_html = '<a title="' + opts.strings.prevLinkTitle + '" href="#" id="prevLinkText">' + opts.strings.prevLinkText + "</a>";
	}
	if ((opts.activeImage + 1) < opts.imageArray.length) {
		nav_html += '<a title="' + opts.strings.nextLinkTitle + '" href="#" id="nextLinkText">' + opts.strings.nextLinkText + "</a>";
	}
	nav_html += anzahl;
	$('#numberDisplay').html(nav_html).show();
	}
	if (opts.slideNavBar) {
	    $("#imageData").slideDown(opts.navBarSlideSpeed);
	} else {
	$("#imageData").show();
	}
	var arrayPageSize = $.fn.lightbox.getPageSize();
	$('#overlay').height(arrayPageSize[1]);
	$.fn.lightbox.updateNav();
};
$.fn.lightbox.updateNav = function(){
	$('#hoverNav').show();
	// if not first image in set, display prev image button
	if(opts.activeImage != 0){
	$('#prevLink,#prevLinkText').show().click(function(){
		$.fn.lightbox.changeImage(opts.activeImage - 1); return false;
	});
	}
	// if not last image in set, display next image button
	if(opts.activeImage != (opts.imageArray.length - 1)){
	$('#nextLink,#nextLinkText').show().click(function(){
		$.fn.lightbox.changeImage(opts.activeImage +1); return false;
	});
	}
	$.fn.lightbox.enableKeyboardNav();
};
$.fn.lightbox.enableKeyboardNav = function(){
	document.onkeydown = $.fn.lightbox.keyboardAction;
};
$.fn.lightbox.disableKeyboardNav = function(){
	document.onkeydown = '';
};
$.fn.lightbox.defaults = {
	fileLoadingImage : '/cms/images/lightbox/loading.gif',
	fileBottomNavCloseImage : '/cms/img/basics/btn_overlay_close.gif',
	overlayOpacity : 0.5,
	borderSize : 10,
	imageArray : new Array,
	activeImage : null,
	inprogress : false,
	resizeSpeed : 350,
	widthCurrent: 250,
	heightCurrent: 250,
	xScale : 1,
	yScale : 1,
	displayTitle: true,
	navbarOnTop: false,
	slideNavBar: false, // slide nav bar up/down between image resizing transitions
	navBarSlideSpeed: 350,
	displayHelp: false,
	strings : {
	help: ' \u2190 / P - previous image\u00a0\u00a0\u00a0\u00a0\u2192 / N - next image\u00a0\u00a0\u00a0\u00a0ESC / X - close image gallery',
	prevLinkTitle: 'vorheriges Bild',
	nextLinkTitle: 'n&auml;chstes Bild',
	prevLinkText:  '<img src="/cms/img/basics/btn_teaser-paging_prev.gif">',
	nextLinkText:  '<img src="/cms/img/basics/btn_teaser-paging_next.gif">',
	closeTitle: 'Galerie schließen',
	image: 'Bild ',
	of: ' von '
	},
	fitToScreen: true	// resize images if they are bigger than window
};
})(jQuery);