/**

 * jQuery Lightbox

 * Version 0.5 - 11/29/2007

 * @author Warren Krewenki

 *

 * This package is distributed under the BSD license.

 * For full license information, see LICENSE.TXT

 *

 * 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" style="font-size:16px;"></span></div><div style="float:left; padding-top:3px;"><span id="numberDisplay"></span></div><div id="bottomNav">';



		if (opts.displayHelp)

			imageData += '<span id="helpDisplay">' + opts.strings.help + '</span>';



		imageData += '<a href="javascript://" id="bottomNavClose" title="' + opts.strings.closeTitle + '"><img src="'+opts.fileBottomNavCloseImage+'"></a></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(){



		$('#numberDisplay').html('');



		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;



		/*nav_html = opts.strings.image + (opts.activeImage + 1)+ opts.strings.of + opts.imageArray.length;*/

		nav_html = opts.strings.image + opts.strings.of ;



			// display previous / next text links

			if ((opts.activeImage) > 0) {

				nav_html = '<a title="' + opts.strings.prevLinkTitle + '" href="#" id="prevLinkText">' + opts.strings.prevLinkText + "</a>" + nav_html;

			}



			if ((opts.activeImage + 1) < opts.imageArray.length) {

				nav_html += '<a title="' + opts.strings.nextLinkTitle + '" href="#" id="nextLinkText">' + opts.strings.nextLinkText + "</a>";

			}



			$('#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(){

		if(opts.imageArray.length > 1){

			$('#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 : 'images/loading.gif',

		fileBottomNavCloseImage : 'images/closelabel.gif',

		overlayOpacity : 0.8,

		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: 'previous image',

			nextLinkTitle: 'next image',

			prevLinkText:  '',

			nextLinkText:  '',

			closeTitle: 'close image gallery',

			image: '&copy; 2003-2010 Nick Saglimbeni / Slickforce Inc. All rights reserved.',

			of: ' '

		},

		fitToScreen: false		// resize images if they are bigger than window

	};

})(jQuery);