/*!
	Slimbox v2.02 - The ultimate lightweight Lightbox clone for jQuery
	(c) 2007-2009 Christophe Beyls <http://www.digitalia.be>
	MIT-style license.
*/

(function($) {

	// Global variables, accessible to Slimbox only
	var win = $(window), options, images, activeImage = -1, activeURL, prevImage, nextImage, compatibleOverlay, middle, centerWidth, centerHeight, ie6 = !window.XMLHttpRequest,
		operaFix = window.opera && (document.compatMode == "CSS1Compat") && ($.browser.version >= 9.3), documentElement = document.documentElement,

	// Preload images
	preload = {}, preloadPrev = new Image(), preloadNext = new Image(),

	// DOM elements
	overlay, center, image, sizer, prevLink, nextLink, bottomContainer, bottom, caption, number
	
	// added by Ryan O'Brien May 7, 2009 to automate the slideshow
	, pause, play, autoPlay = true, playTimer;

	/*
		Initialization
	*/

	$(function() {
		// Append the Slimbox HTML code at the bottom of the document
		$("body").append(
			$([
				overlay = $('<div id="lbOverlay" />')[0],
				center = $('<div id="lbCenter" />')[0],
				bottomContainer = $('<div id="lbBottomContainer" />')[0]
			]).css("display", "none")
		);

		image = $('<div id="lbImage" />').appendTo(center).append(
			sizer = $('<div style="position: relative;" />').append([
				$('<a id="lbCloLink" href="#" />').add(overlay).click(close)[0]
			])[0]
		)[0];

		bottom = $('<div id="lbBottom" />').appendTo(bottomContainer).append([
			$('<a id="lbNexLink" href="#" />').hide().add(overlay).click(next)[0],
			$('<a id="lbPauseLink" href="#" />').add(overlay).click(pause)[0],
			$('<a id="lbPlayLink" href="#" />').hide().add(overlay).click(play)[0],
			$('<a id="lbPreLink" href="#" />').hide().add(overlay).click(previous)[0],
			caption = $('<div id="lbCaption" />')[0],
			number = $('<div id="lbNumber" />')[0],
			$('<div style="clear: both;" />')[0]
		])[0];
	});


	/*
		API
	*/

	// Open Slimbox with the specified parameters
	$.slimbox = function(_images, startImage, _options) {
		options = $.extend({
			loop: false,				// Allows to navigate between first and last images
			overlayOpacity: 0.8,			// 1 is opaque, 0 is completely transparent (change the color in the CSS file)
			overlayFadeDuration: 400,		// Duration of the overlay fade-in and fade-out animations (in milliseconds)
			resizeDuration: 400,			// Duration of each of the box resize animations (in milliseconds)
			resizeEasing: "swing",			// "swing" is jQuery's default easing
			initialWidth: 250,			// Initial width of the box (in pixels)
			initialHeight: 250,			// Initial height of the box (in pixels)
			imageFadeDuration: 400,			// Duration of the image fade-in animation (in milliseconds)
			captionAnimationDuration: 400,		// Duration of the caption animation (in milliseconds)
			counterText: "Image {x} of {y}",	// Translate or change as you wish, or set it to false to disable counter text for image groups
			closeKeys: [27, 88, 67],		// Array of keycodes to close Slimbox, default: Esc (27), 'x' (88), 'c' (67)
			previousKeys: [37, 80],			// Array of keycodes to navigate to the previous image, default: Left arrow (37), 'p' (80)
			nextKeys: [39, 78]			// Array of keycodes to navigate to the next image, default: Right arrow (39), 'n' (78)
		}, _options);

		// The function is called for a single image, with URL and Title as first two arguments
		if (typeof _images == "string") {
			_images = [[_images, startImage]];
			startImage = 0;
		}

		middle = win.scrollTop() + ((operaFix ? documentElement.clientHeight : win.height()) / 2);
		centerWidth = options.initialWidth;
		centerHeight = options.initialHeight;
		$(center).css({top: Math.max(0, middle - (centerHeight / 2)), width: centerWidth, height: centerHeight, marginLeft: -centerWidth/2}).show();
		compatibleOverlay = ie6 || (overlay.currentStyle && (overlay.currentStyle.position != "fixed"));
		if (compatibleOverlay) overlay.style.position = "absolute";
		$(overlay).css("opacity", options.overlayOpacity).fadeIn(options.overlayFadeDuration);
		position();
		setup(1);

		images = _images;
		options.loop = options.loop && (images.length > 1);
		return changeImage(startImage);
	};

	/*
		options:	Optional options object, see jQuery.slimbox()
		linkMapper:	Optional function taking a link DOM element and an index as arguments and returning an array containing 2 elements:
				the image URL and the image caption (may contain HTML)
		linksFilter:	Optional function taking a link DOM element and an index as arguments and returning true if the element is part of
				the image collection that will be shown on click, false if not. "this" refers to the element that was clicked.
				This function must always return true when the DOM element argument is "this".
	*/
	$.fn.slimbox = function(_options, linkMapper, linksFilter) {
		linkMapper = linkMapper || function(el) {
			return [el.href, el.title];
		};

		linksFilter = linksFilter || function() {
			return true;
		};

		var links = this;

		return links.unbind("click").click(function() {
			// Build the list of images that will be displayed
			var link = this, startIndex = 0, filteredLinks, i = 0, length;
			filteredLinks = $.grep(links, function(el, i) {
				return linksFilter.call(link, el, i);
			});

			// We cannot use jQuery.map() because it flattens the returned array
			for (length = filteredLinks.length; i < length; ++i) {
				if (filteredLinks[i] == link) startIndex = i;
				filteredLinks[i] = linkMapper(filteredLinks[i], i);
			}

			return $.slimbox(filteredLinks, startIndex, _options);
		});
	};


	/*
		Internal functions
	*/
	
	// function added by Ryan O'Brien Sep 15, 2009 to force navigation controls to show properly all the time
	function ShowHideNavigation() {
		if (autoPlay == true) {
			$("#lbPreLink").hide();
			$("#lbPlayLink").hide();
			$("#lbPauseLink").show();
			$("#lbNexLink").hide();
			
		} else {
			
			$("#lbPauseLink").hide();
			if (activeImage > 0) {
					$("#lbPreLink").show();
			} else {
					$("#lbPreLink").hide();
			}
			
			if ((activeImage + 1) < images.length) {
				$("#lbPlayLink").show();
				$("#lbNexLink").show();
			} else {
				$("#lbPlayLink").hide();
				$("#lbNexLink").hide();
			}
		}
	}
	
	// added by Ryan O'Brien May 7, 2009 to automate the slideshow
	function pause() {
		autoPlay = false;
		clearTimeout(playTimer);
		activeImage--;
		ShowHideNavigation();  // replaced multiple button references by Ryan O'Brien Sep 15, 2009 with sigle function call
	}
	
	// added by Ryan O'Brien May 7, 2009 to automate the slideshow
	function automate() {
		ShowHideNavigation();  // replaced multiple button references by Ryan O'Brien Sep 15, 2009 with sigle function call
		if (autoPlay == true) {
			if ((activeImage + 1) < images.length) {
				activeImage++;
				playTimer = setTimeout(function() {changeImage(activeImage);}, 7000);
			} else {
				$("#lbPauseLink").hide();
				$("#lbPreLink").show();
				autoPlay = false;  // added by Ryan O'Brien Sep 15, 2009
			}
		}
	}
	
	function position() {
		var l = win.scrollLeft(), w = operaFix ? documentElement.clientWidth : win.width();
		$([center, bottomContainer]).css("left", l + (w / 2));
		if (compatibleOverlay) $(overlay).css({left: l, top: win.scrollTop(), width: w, height: win.height()});
	}

	function setup(open) {
		$("object").add(ie6 ? "select" : "embed").each(function(index, el) {
			if (open) $.data(el, "slimbox", el.style.visibility);
			el.style.visibility = open ? "hidden" : $.data(el, "slimbox");
		});
		var fn = open ? "bind" : "unbind";
		win[fn]("scroll resize", position);
		$(document)[fn]("keydown", keyDown);
	}

	function keyDown(event) {
		var code = event.keyCode, fn = $.inArray;
		// Prevent default keyboard action (like navigating inside the page)
		return (fn(code, options.closeKeys) >= 0) ? close()
			: (fn(code, options.nextKeys) >= 0) ? next()
			: (fn(code, options.previousKeys) >= 0) ? previous()
			: false;
	}

	function previous() {
		return changeImage(prevImage);
	}

	function next() {
		return changeImage(nextImage);
	}

	function changeImage(imageIndex) {
		if (imageIndex >= 0) {
			activeImage = imageIndex;
			activeURL = images[activeImage][0];
			prevImage = (activeImage || (options.loop ? images.length : 0)) - 1;
			nextImage = ((activeImage + 1) % images.length) || (options.loop ? 0 : -1);

			stop();
			center.className = "lbLoading";
			
			preload = new Image();
			preload.onload = function() {animateBox();}
			preload.src = activeURL;
		}

		return false;
	}

	// added by Ryan O'Brien May 7, 2009 to automate the slideshow
	function play() {
		// removed references to show / hide buttons by Ryan O'Brien Sep 15, 2009
		autoPlay = true;
		changeImage(activeImage);
	}
	
	function animateBox() {
		center.className = "";
		$(image).css({backgroundImage: "url(" + activeURL + ")", visibility: "hidden", display: ""});
		$(sizer).width(preload.width);
		$(sizer).height(preload.height);  // modified by Ryan O'Brien May 7, 2009 to remove prevLink & nextLink

		$(caption).html(images[activeImage][1] || "");
		$(number).html((((images.length > 1) && options.counterText) || "").replace(/{x}/, activeImage + 1).replace(/{y}/, images.length));

		if ((prevImage >= 0) && (autoPlay == false)) {preloadPrev.src = images[prevImage][0];}
		if (nextImage >= 0) {preloadNext.src = images[nextImage][0];}

		centerWidth = image.offsetWidth;
		centerHeight = image.offsetHeight;
		var top = Math.max(0, middle - (centerHeight / 2));
		if (center.offsetHeight != centerHeight) {
			$(center).animate({height: centerHeight, top: top}, options.resizeDuration, options.resizeEasing);
		}
		if (center.offsetWidth != centerWidth) {
			$(center).animate({width: centerWidth, marginLeft: -centerWidth/2}, options.resizeDuration, options.resizeEasing);
		}
		$(center).queue(function() {
			$(bottomContainer).css({width: centerWidth, top: top + centerHeight, marginLeft: -centerWidth/2, visibility: "hidden", display: ""});
			$(image).css({display: "none", visibility: "", opacity: ""}).fadeIn(options.imageFadeDuration, animateCaption);
		});
	}

	function animateCaption() {
		// if (prevImage >= 0) $(prevLink).show();  // removed by Ryan O'Brien May 7, 2009 to remove prevLink & nextLink
		// if (nextImage >= 0) $(nextLink).show();  // removed by Ryan O'Brien May 7, 2009 to remove prevLink & nextLink
		// modified by Ryan O'Brien May 13, 2009 to add automate as a call back function to properly time the slide show with slow connections
		$(bottom).css("marginTop", -bottom.offsetHeight).animate({marginTop: 0}, options.captionAnimationDuration, function(){automate();});
		bottomContainer.style.visibility = "";
	}

	function stop() {
		preload.onload = null;
		preload.src = preloadPrev.src = preloadNext.src = activeURL;
		$([center, image, bottom]).stop(true);
		$([image, bottomContainer]).hide();  // modified by Ryan O'Brien May 7, 2009 to remove prevLink & nextLink
	}

	function close() {
		if (activeImage >= 0) {
			stop();
			activeImage = prevImage = nextImage = -1;
			$(center).hide();
			$(overlay).stop().fadeOut(options.overlayFadeDuration, setup);
			clearTimeout(playTimer);  // added by Ryan O'Brien May 7, 2009 to automate the slideshow
			autoPlay = true;  // added by Ryan O'Brien May 7, 2009 to automate the slideshow
			ShowHideNavigation();  // replaced multiple button references by Ryan O'Brien Sep 15, 2009 with sigle function call
		}

		return false;
	}

})(jQuery);