/**
 * jQuery Lightbox
 * @author Warren Krewenki
 *
 * This package is distributed under the BSD license.
 * For full license information, see LICENSE.TXT
 *
 * Based on Lightbox 2 by Lokesh Dhakar (http://www.huddletogether.com/projects/lightbox2/)
 *
 *
 **/

(function($) {
	$.fn.lightbox = function(options) {
		// build main options
		var opts = $.extend({}, $.fn.lightbox.defaults, options);
        
		var selectorNames = {
			lightbox: opts.selectorPrefix + 'lightbox',
			outerImageContainer: opts.selectorPrefix + 'outerImageContainer',
			imageContainer: opts.selectorPrefix + 'imageContainer',
			lightboxIframe: opts.selectorPrefix + 'lightboxIframe',
			lightboxImage: opts.selectorPrefix + 'lightboxImage',
			hoverNav: opts.selectorPrefix + 'hoverNav',
			prevLink: opts.selectorPrefix + 'prevLink',
			nextLink: opts.selectorPrefix + 'nextLink',
			loading: opts.selectorPrefix + 'loading',
			loadingLink: opts.selectorPrefix + 'loadingLink',
			imageDataContainer: opts.selectorPrefix + 'imageDataContainer',
			clearfix: opts.selectorPrefix + 'clearfix',
			imageData: opts.selectorPrefix + 'imageData',
			imageDetails: opts.selectorPrefix + 'imageDetails',
			caption: opts.selectorPrefix + 'caption',
			numberDisplay: opts.selectorPrefix + 'numberDisplay',
			bottomNav: opts.selectorPrefix + 'bottomNav',
			helpDisplay: opts.selectorPrefix + 'helpDisplay',
			bottomNavClose: opts.selectorPrefix + 'bottomNavClose',
			overlay: opts.selectorPrefix + 'overlay',
			prevLinkText: opts.selectorPrefix + 'prevLinkText',
			nextLinkText: opts.selectorPrefix + 'nextLinkText',
			ontop: opts.selectorPrefix + 'ontop'
		};
		
		$(window).resize(resizeOverlayToFitWindow);

		return $(this).live("click",function(){
			// initialize the lightbox
			initialize();
			showLightbox(this);
			return false;
		});
		
		/*
		# Initialize the lightbox by creating our html and reading some image data
		# This method is called by the constructor after any click events trigger it
		# You will never call it by itself, to my knowledge.
		*/
		function initialize() {
			$('#'+selectorNames.overlay+', #'+selectorNames.hoverNav).remove();
			opts.inprogress = false;

			// if jsonData, build the imageArray from data provided in JSON format
			if (opts.jsonData && opts.jsonData.length > 0) {
				var parser = opts.jsonDataParser ? opts.jsonDataParser : $.fn.lightbox.parseJsonData;                
				opts.imageArray = [];
				opts.imageArray = parser(opts.jsonData);
			}
    
			var outerImage = '<div id="'+selectorNames.outerImageContainer+'"><div id="'+selectorNames.imageContainer+'"><iframe id="'+selectorNames.lightboxIframe+'"></iframe><img id="'+selectorNames.lightboxImage+'" /><div id="'+selectorNames.hoverNav+'"><a href="javascript://" title="' + opts.strings.prevLinkTitle + '" id="'+selectorNames.prevLink+'"></a><a href="javascript://" id="'+selectorNames.nextLink+'" title="' + opts.strings.nextLinkTitle + '"></a></div><div id="'+selectorNames.loading+'"><a href="javascript://" id="'+selectorNames.loadingLink+'"><img src="'+opts.fileLoadingImage+'"></a></div></div></div>';
			var imageData = '<div id="'+selectorNames.imageDataContainer+'" class="'+selectorNames.clearfix+'"><div id="'+selectorNames.imageData+'"><div id="'+selectorNames.imageDetails+'"><span id="'+selectorNames.caption+'"></span><span id="'+selectorNames.numberDisplay+'"></span></div><div id="'+selectorNames.bottomNav+'">';

			if (opts.displayHelp) {
				imageData += '<span id="'+selectorNames.helpDisplay+'">' + opts.strings.help + '</span>';
			}

			imageData += '<a href="javascript://" id="'+selectorNames.bottomNavClose+'" title="' + opts.strings.closeTitle + '"><img src="'+opts.fileBottomNavCloseImage+'"></a></div></div></div>';

			var string;

			if (opts.navbarOnTop) {
				string = '<div id="'+selectorNames.overlay+'"></div><div id="'+selectorNames.lightbox+'">' + imageData + outerImage + '</div>';
				$("body").append(string);
				$("#'+selectorNames.imageDataContainer+'").addClass(selectorNames.ontop);
			} else {
				string = '<div id="'+selectorNames.overlay+'"></div><div id="'+selectorNames.lightbox+'">' + outerImage + imageData + '</div>';
				$("body").append(string);
			}

			$('#'+selectorNames.overlay+', #'+selectorNames.lightbox).click(function(){ end(); }).hide();
			$('#'+selectorNames.loadingLink+', #'+selectorNames.bottomNavClose).click(function(){ end(); return false;});
			$('#'+selectorNames.outerImageContainer).width(opts.widthCurrent).height(opts.heightCurrent);
			$('#'+selectorNames.imageDataContainer).width(opts.widthCurrent);

			if (!opts.imageClickClose) {
				$('#'+selectorNames.lightboxImage+'').click(function(){ return false; });
				$('#'+selectorNames.hoverNav).click(function(){ return false; });
			}
			
			return true;
		};

		/*
		# Get the document and window width/heigh
		#
		# Examples
		#
		#	getPageSize()
		#	# => [1024,768,1024,768]
		#
		# Returns a numerically indexed array of document width/height and window width/height
		*/
		function getPageSize() {
			var jqueryPageSize = new Array($(document).width(),$(document).height(), $(window).width(), $(window).height());
			return jqueryPageSize;
		};
	    
		function getPageScroll() {
			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;
		};

		/*
		# Pause execution for a length of time
		#
		# ms - Number of milliseconds to pause execution
		#
		# Examples
		#
		#	pause(500)
		#	# => true
		# This runs an ugly loop until the execution time has passed
		# It is a horrible, horrible method and I wish to dispense with it, maybe via timeouts or something.
		# Really, this thing is nasty.  I think it had a really bad childhood or something.  I mean, it is
		# incredibly cruel to your browser, and to my self esteem. I didn't want to write it. I didn't want to include
		# it in my library, what with it's sexy overlay and whatnot, but here it is 4 years later and this thing lives on.
		# Please don't upset it, i've been told it will eat your dreams.
		*/
		function pause(ms) {
			var date = new Date();
			var curDate = null;
			do{curDate = new Date();}
			while(curDate - date < ms);
		};
	    

		/*
		# Deploy the sexy overlay and display the lightbox
		#
		# imageObject - the jQuery object passed via the click event in the constructor
		#
		# Examples
		#
		#	showLightbox($('#CheesusCrust'))
		#
		# Returns a boolean true, because it's got nothing else to return. It should give visual feedback when run
		*/
		function showLightbox(imageObject) {
			/**
			* select, embed and object tags render over the lightbox in some browsers
			* Right now, the best way to fix it is to hide them, but that can trigger reloading of some flash content
			* I don't have a better fix for this right now, but I want ot leave this comment here so you and I both 
			* know that i'm aware of it, and I would love to fix it, if you have any suggestions.
			**/
			$("select, embed, object").hide();

			// Resize and display the sexy, sexy overlay.
			resizeOverlayToFitWindow();
			$('#'+selectorNames.overlay).hide().css({ opacity : opts.overlayOpacity }).fadeIn();
			imageNum = 0;

			// if data is not provided by jsonData parameter
			if (!opts.jsonData) {
				opts.imageArray = [];
				// if image is NOT part of a set..
				if ((!imageObject.rel || (imageObject.rel == '')) && !opts.allSet) {
					// add single image to Lightbox.imageArray
					opts.imageArray.push(new Array(imageObject.href, opts.displayTitle ? imageObject.title : ''));
				} else {
					// if image is part of a set..
					$("a").each(function() {
						if(this.href && (this.rel == imageObject.rel)) {
							opts.imageArray.push(new Array(this.href, opts.displayTitle ? this.title : ''));
						}
					});
				}
			}
	
			if (opts.imageArray.length > 1) {
				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] != imageObject.href) { 
					imageNum++;
				}
			}

			// calculate top and left offset for the lightbox
			var arrayPageScroll = getPageScroll();
			var lightboxTop = arrayPageScroll[1] + ($(window).height() / 10);
			var lightboxLeft = arrayPageScroll[0];
			$('#'+selectorNames.lightbox).css({top: lightboxTop+'px', left: lightboxLeft+'px'}).show();

			if (!opts.slideNavBar) {
				$('#'+selectorNames.imageData).hide();
			}

			changeImage(imageNum);
		};
	    
		function changeImage(imageNum) {
			if (opts.inprogress == false) {
				opts.inprogress = true;

				// update global var
				opts.activeImage = imageNum;	

				// hide elements during transition
				$('#'+selectorNames.loading).show();
				$('#'+selectorNames.lightboxImage+', #'+selectorNames.hoverNav+', #'+selectorNames.prevLink+', #'+selectorNames.nextLink).hide();

				// delay preloading image until navbar will slide up
				if (opts.slideNavBar) { 
					$('#'+selectorNames.imageDataContainer).hide();
					$('#'+selectorNames.imageData).hide();
				}
				doChangeImage();
			}
		};

		function doChangeImage() {
			imgPreloader = new Image();

			// once image is preloaded, resize image container
			imgPreloader.onload = function() {
				var newWidth = imgPreloader.width;
				var newHeight = imgPreloader.height;

				if (opts.scaleImages) {
					newWidth = parseInt(opts.xScale * newWidth);
					newHeight = parseInt(opts.yScale * newHeight);
				}

				if (opts.fitToScreen) {
					var arrayPageSize = getPageSize();
					var ratio;
					var initialPageWidth = arrayPageSize[2] - 2 * opts.borderSize;
					var initialPageHeight = arrayPageSize[3] - 200;

					var dI = initialPageWidth/initialPageHeight;
					var dP = imgPreloader.width/imgPreloader.height;

					if ((imgPreloader.height > initialPageHeight) || (imgPreloader.width > initialPageWidth)) {
						if (dI > dP) {
							newWidth = parseInt((initialPageHeight/imgPreloader.height) * imgPreloader.width);
							newHeight = initialPageHeight;
						} else {
							newHeight = parseInt((initialPageWidth/imgPreloader.width) * imgPreloader.height);
							newWidth = initialPageWidth;
						}
					}
				}

				$('#'+selectorNames.lightboxImage).
					attr('src', opts.imageArray[opts.activeImage][0]).
					width(newWidth).
					height(newHeight);

					resizeImageContainer(newWidth, newHeight);
			};

			imgPreloader.src = opts.imageArray[opts.activeImage][0];
		};

		function end() {
			disableKeyboardNav();
			$('#'+selectorNames.lightbox).hide();
			$('#'+selectorNames.overlay).fadeOut();
			$('select, object, embed').show();
		};

		function preloadNeighborImages() {
			if (opts.loopImages && opts.imageArray.length > 1) {
				preloadNextImage = new Image();
				preloadNextImage.src = opts.imageArray[(opts.activeImage == (opts.imageArray.length - 1)) ? 0 : opts.activeImage + 1][0];

				preloadPrevImage = new Image();
				preloadPrevImage.src = opts.imageArray[(opts.activeImage == 0) ? (opts.imageArray.length - 1) : opts.activeImage - 1][0];
			} else {
				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];
				}
			}
		};

		function resizeImageContainer(imgWidth, imgHeight) {
			// get current width and height
			opts.widthCurrent = $('#'+selectorNames.outerImageContainer).outerWidth();
			opts.heightCurrent = $('#'+selectorNames.outerImageContainer).outerHeight();

			// get new width and height
			var widthNew = Math.max(350, imgWidth  + (opts.borderSize * 2));
			var heightNew = (imgHeight  + (opts.borderSize * 2));

			// calculate size difference between new and old image, and resize if necessary
			wDiff = opts.widthCurrent - widthNew;
			hDiff = opts.heightCurrent - heightNew;

			$('#'+selectorNames.imageDataContainer).animate({width: widthNew},opts.resizeSpeed,'linear');
			$('#'+selectorNames.outerImageContainer).animate({width: widthNew},opts.resizeSpeed,'linear', function() {
				$('#'+selectorNames.outerImageContainer).animate({height: heightNew},opts.resizeSpeed,'linear', function() {
					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) { 
					pause(250); 
				} else { 
					pause(100);
				}
			}

			$('#'+selectorNames.prevLink).height(imgHeight);
			$('#'+selectorNames.nextLink).height(imgHeight);
		};

		function showImage() {
			$('#'+selectorNames.loading).hide();
			$('#'+selectorNames.lightboxImage).fadeIn("fast");
			updateDetails();
			preloadNeighborImages();

			opts.inprogress = false;
		};

		function updateDetails() {
			$('#'+selectorNames.numberDisplay).html('');

			if (opts.imageArray[opts.activeImage][1]) {
				$('#'+selectorNames.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;

				if (opts.displayDownloadLink) {
					nav_html += "<a href='" + opts.imageArray[opts.activeImage][0] + "'>" + opts.strings.download + "</a>";
				}				

				if (!opts.disableNavbarLinks) {
					// display previous / next text links
					if ((opts.activeImage) > 0 || opts.loopImages) {
						nav_html = '<a title="' + opts.strings.prevLinkTitle + '" href="#" id="'+selectorNames.prevLinkText+'">' + opts.strings.prevLinkText + "</a>" + nav_html;
					}

					if (((opts.activeImage + 1) < opts.imageArray.length) || opts.loopImages) {
						nav_html += '<a title="' + opts.strings.nextLinkTitle + '" href="#" id="'+selectorNames.nextLinkText+'">' + opts.strings.nextLinkText + "</a>";
					}
				}

				$('#'+selectorNames.numberDisplay).html(nav_html).show();
			}

			if (opts.slideNavBar) {
				$('#'+selectorNames.imageData).slideDown(opts.navBarSlideSpeed);
			} else {
				$('#'+selectorNames.imageData).show();
			}

			resizeOverlayToFitWindow();
			updateNav();
		};

		/*
		# Resize the sexy overlay to fit the constraints of your current viewing environment
		# 
		# This should now happen whenever a window is resized, so you should always see a full overlay
		*/
		function resizeOverlayToFitWindow(){
			$('#'+selectorNames.overlay).css({width: $(document).width(), height: $(document).height()});
			//  ^^^^^^^ <- sexy!
		};

		function updateNav() {
			if (opts.imageArray.length > 1) {
				$('#'+selectorNames.hoverNav).show();

				// if loopImages is true, always show next and prev image buttons 
				if(opts.loopImages) {
					$('#'+selectorNames.prevLink+',#'+selectorNames.prevLinkText).show().click(function() {
						changeImage((opts.activeImage == 0) ? (opts.imageArray.length - 1) : opts.activeImage - 1); 
						return false;
					});

					$('#'+selectorNames.nextLink+',#'+selectorNames.nextLinkText).show().click(function() {
						changeImage((opts.activeImage == (opts.imageArray.length - 1)) ? 0 : opts.activeImage + 1); 
						return false;
					});

				} else {
					// if not first image in set, display prev image button
					if(opts.activeImage != 0) {
						$('#'+selectorNames.prevLink+',#'+selectorNames.prevLinkText).show().click(function() {
							changeImage(opts.activeImage - 1); 
							return false;
						});
					}

					// if not last image in set, display next image button
					if(opts.activeImage != (opts.imageArray.length - 1)) {
						$('#'+selectorNames.nextLink+',#'+selectorNames.nextLinkText).show().click(function() {
							changeImage(opts.activeImage +1); 
							return false;
						});
					}
				}

				enableKeyboardNav();
			}
		};

		function keyboardAction(e) {
			var o = e.data.opts;
			var keycode = e.keyCode;
			var escapeKey = 27;

			var key = String.fromCharCode(keycode).toLowerCase();

			// close lightbox
			if ((key == 'x') || (key == 'o') || (key == 'c') || (keycode == escapeKey)) { 
				end();

				// display previous image	
			} else if ((key == 'p') || (keycode == 37)) {  
				if(o.loopImages) {
					disableKeyboardNav();
					changeImage((o.activeImage == 0) ? (o.imageArray.length - 1) : o.activeImage - 1);
				} else if (o.activeImage != 0) {
					disableKeyboardNav();
					changeImage(o.activeImage - 1);
				}

				// display next image
			} else if ((key == 'n') || (keycode == 39)) { 
				if (opts.loopImages) {
					disableKeyboardNav();
					changeImage((o.activeImage == (o.imageArray.length - 1)) ? 0 : o.activeImage + 1);
				} else if (o.activeImage != (o.imageArray.length - 1)) {
					disableKeyboardNav();
					changeImage(o.activeImage + 1);
				}
			}
		};

		function enableKeyboardNav() {
			$(document).bind('keydown', {opts: opts}, keyboardAction);
		};

		function disableKeyboardNav() {
			$(document).unbind('keydown');
		};	    
	};

	$.fn.lightbox.parseJsonData = function(data) {
		var imageArray = [];

		$.each(data, function() {
			imageArray.push(new Array(this.url, this.title));
		});

		return imageArray;
	};

	$.fn.lightbox.defaults = {
		selectorPrefix:'',
		allSet: false,
		fileLoadingImage: 'images/loading.gif',
		fileBottomNavCloseImage: 'images/closelabel.gif',
		overlayOpacity: 0.6,
		borderSize: 10,
		imageArray: new Array,
		activeImage: null,
		inprogress: false,
		resizeSpeed: 350,
		widthCurrent: 250,
		heightCurrent: 250,
		scaleImages: false,
		xScale: 1,
		yScale: 1,
		displayTitle: true,
		navbarOnTop: false,
		displayDownloadLink: false,
		slideNavBar: false, 
		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:  '&laquo; Previous',
			nextLinkText:  'Next &raquo;',
			closeTitle: 'close image gallery',
			image: 'Image ',
			of: ' of ',
			download: 'Download'
		},
		fitToScreen: false,		
		disableNavbarLinks: false,
		loopImages: false,
		imageClickClose: true,
		jsonData: null,
		jsonDataParser: null
	};	
})(jQuery);