/**
* 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
*
* 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($) {

	$.fn.lightbox = function(options) {
		// build main options
		var opts = $.extend({}, $.fn.lightbox.defaults, options);

		return this.each(function() {
			$(this).click(function() {
				// initalize the lightbox
				initialize();
				start(this);
				return false;
			});
		});

		/**
		* initalize()
		*
		* @return void
		* @author Warren Krewenki
		*/

		function initialize() {
			$('#overlay').remove();
			$('#lightbox').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="outerImageContainer"><div id="imageContainer"><iframe id="lightboxIframe" /><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><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() { end(); }).hide();
			$("#lightbox").click(function() { end(); }).hide();
			$("#loadingLink").click(function() { end(); return false; });
			$("#bottomNavClose").click(function() { end(); return false; });
			$('#outerImageContainer').width(opts.widthCurrent).height(opts.heightCurrent);
			$('#imageDataContainer').width(opts.widthCurrent);

			if (!opts.imageClickClose) {
				$("#lightboxImage").click(function() { return false; });
				$("#hoverNav").click(function() { return false; });
			}
		};

		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;
		};

		function pause(ms) {
			var date = new Date();
			var curDate = null;
			do { curDate = new Date(); }
			while (curDate - date < ms);
		};

		function start(imageLink) {
			$("select, embed, object").hide();
			var arrayPageSize = getPageSize();
			$("#overlay").hide().css({ width: '100%', height: arrayPageSize[1] + 'px', 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 (!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 : ''));
						}
					});
				}
			}

			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] != imageLink.href) { imageNum++; }
			}

			// calculate top and left offset for the lightbox
			var arrayPageScroll = 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();

			changeImage(imageNum);
		};

		function changeImage(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();
					doChangeImage();
				} else {
					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.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;
						}
					}
				}

				$('#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();
			$('#lightbox').hide();
			$('#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 = $("#outerImageContainer").outerWidth();
			opts.heightCurrent = $("#outerImageContainer").outerHeight();

			// get new width and height
			var widthNew = Math.max(350, 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() {
					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); }
			}

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

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

			opts.inprogress = false;
		};

		function updateDetails() {

			$('#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;

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

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

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

			var arrayPageSize = getPageSize();
			$('#overlay').height(arrayPageSize[1]);
			updateNav();
		};

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

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

					$('#nextLink,#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) {
						$('#prevLink,#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)) {
						$('#nextLink,#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();

			if ((key == 'x') || (key == 'o') || (key == 'c') || (keycode == escapeKey)) { // close lightbox
				end();
			} else if ((key == 'p') || (keycode == 37)) { // display previous image
				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);
				}
			} else if ((key == 'n') || (keycode == 39)) { // display next image
				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 = {
		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: '&laquo; Previous',
			nextLinkText: 'Next &raquo;',
			closeTitle: 'close image gallery',
			image: 'Image ',
			of: ' of '
		},
		fitToScreen: false, // resize images if they are bigger than window
		disableNavbarLinks: false,
		loopImages: false,
		imageClickClose: true,
		jsonData: null,
		jsonDataParser: null
	};

})(jQuery);