var Proto;

(function() {

	var elementsStyle = {}, state = 0, options, images, activeImage, prevImage, nextImage, top, fx, preload, preloadPrev = new Image(), preloadNext = new Image(), overlay, center, image, prevLink, nextLink, bottomContainer, bottom, caption, number;

	window.addEvent("domready", function() {
		$(document.body).adopt(
			$$([
				overlay = new Element("div", {id: "lbOverlay"}).addEvent("click", close),
				center = new Element("div", {id: "lbCenter"}),
				bottomContainer = new Element("div", {id: "lbBottomContainer"})
			]).setStyle("display", "none")
		);

		image = new Element("div", {id: "lbImage"}).injectInside(center).adopt(
			prevLink = new Element("a", {id: "lbPrevLink", href: "#"}).addEvent("click", previous),
			nextLink = new Element("a", {id: "lbNextLink", href: "#"}).addEvent("click", next)
		);

		bottom = new Element("div", {id: "lbBottom"}).injectInside(bottomContainer).adopt(
			new Element("a", {id: "lbCloseLink", href: "#"}).addEvent("click", close),
			caption = new Element("div", {id: "lbCaption"}),
			number = new Element("div", {id: "lbNumber"}),
			new Element("div", {styles: {clear: "both"}})
		);
		
		fx = {
			overlay: new Fx.Tween(overlay, {property: "opacity", duration: 500}).set(0),
			image: new Fx.Tween(image, {property: "opacity", duration: 500, onComplete: nextEffect}),
			bottom: new Fx.Tween(bottom, {property: "margin-top", duration: 400})
		};
	});

	Proto = {
		open: 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)
				resizeDuration: 600,			// Duration of each of the box resize animations (in milliseconds)
				resizeTransition: false,		// Default transition in mootools
				initialWidth: 250,			// Initial width of the box (in pixels)
				initialHeight: 250,			// Initial height of the box (in pixels)
				animateCaption: true,
				showCounter: true,			// If true, a counter will only be shown if there is more than 1 image to display
				counterText: "Image {x} of {y}"		// Translate or change as you wish
			}, _options || {});

			if (typeof _images == "string") {
				_images = [[_images,startImage]];
				startImage = 0;
			}

			images = _images;
			options.loop = options.loop && (images.length > 1);
			position();
			setup(true);
			top = window.getScrollTop() + (window.getHeight() / 7);
			fx.resize = new Fx.Morph(center, $extend({duration: options.resizeDuration, onComplete: nextEffect}, options.resizeTransition ? {transition: options.resizeTransition} : {}));
			center.setStyles({top: top, width: options.initialWidth, height: options.initialHeight, marginLeft: -(options.initialWidth/2), display: ""});
			fx.overlay.start(options.overlayOpacity);
			state = 1;
			return changeImage(startImage);
		}
	};

	Element.implement({
		proto: function(_options, linkMapper) {
			$$(this).proto(_options, linkMapper);
			return this;
		}
	});

	Elements.implement({
		proto: function(_options, linkMapper, linksFilter) {
			linkMapper = linkMapper || function(el) {
				return [el.href, el.title];
			};

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

			var links = this;

			links.removeEvents("click").addEvent("click", function() {
				var filteredLinks = links.filter(linksFilter, this);
				return Proto.open(filteredLinks.map(linkMapper), filteredLinks.indexOf(this), _options);
			});

			return links;
		}
	});

	function position() {
		overlay.setStyles({top: window.getScrollTop(), height: window.getHeight()});
	}

	function setup(open) {
		["object", window.ie ? "select" : "embed"].forEach(function(tag) {
			Array.forEach(document.getElementsByTagName(tag), function(el) {
				if (open) elementsStyle[el] = el.style.visibility;
				el.style.visibility = open ? "hidden" : elementsStyle[el];
			});
		});

		overlay.style.display = open ? "" : "none";

		var fn = open ? "addEvent" : "removeEvent";
		window[fn]("scroll", position)[fn]("resize", position);
		document[fn]("keydown", keyDown);
	}

	function keyDown(event) {
		switch(event.code) {
			case 27:	// Esc
			case 88:	// 'x'
			case 67:	// 'c'
				close();
				break;
			case 37:	// Left arrow
			case 80:	// 'p'
				previous();
				break;	
			case 39:	// Right arrow
			case 78:	// 'n'
				next();
		}
		return false;
	}

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

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

	function changeImage(imageIndex) {
		if ((state == 1) && (imageIndex >= 0)) {
			state = 2;
			activeImage = imageIndex;
			prevImage = ((activeImage || !options.loop) ? activeImage : images.length) - 1;
			nextImage = activeImage + 1;
			if (nextImage == images.length) nextImage = options.loop ? 0 : -1;

			$$(prevLink, nextLink, image, bottomContainer).setStyle("display", "none");
			fx.bottom.cancel().set(0);
			fx.image.set(0);
			center.className = "lbLoading";

			preload = new Image();
			preload.onload = nextEffect;
			preload.src = images[imageIndex][0];
		}

		return false;
	}

	function nextEffect() {
		switch (state++) {
			case 2:
				center.className = "";
				image.setStyles({'backgroundImage': "url('" + images[activeImage][0] + "')", display: ""});
				$$(image, bottom).setStyle("width", preload.width);
				$$(image, prevLink, nextLink).setStyle("height", preload.height);

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

				if (prevImage >= 0) preloadPrev.src = images[prevImage][0];
				if (nextImage >= 0) preloadNext.src = images[nextImage][0];

				if (center.clientHeight != image.offsetHeight) {
					fx.resize.start({height: image.offsetHeight});
					break;
				}
				state++;
			case 3:
				if (center.clientWidth != image.offsetWidth) {
					fx.resize.start({width: image.offsetWidth, marginLeft: -image.offsetWidth/2});
					break;
				}
				state++;
			case 4:
				bottomContainer.setStyles({top: top + center.clientHeight, marginLeft: center.style.marginLeft, visibility: "hidden", display: ""});
				fx.image.start(1);
				break;
			case 5:
				if (prevImage >= 0) prevLink.style.display = "";
				if (nextImage >= 0) nextLink.style.display = "";
				if (options.animateCaption) {
					fx.bottom.set(-bottom.offsetHeight).start(0);
				}
				bottomContainer.style.visibility = "";
				state = 1;
		}
	}

	function close() {
		if (state) {
			state = 0;
			preload.onload = $empty;
			for (var f in fx) fx[f].cancel();
			$$(center, bottomContainer).setStyle("display", "none");
			fx.overlay.chain(setup).start(0);
		}

		return false;
	}

})();

Proto.scanPage = function() {
	var links = $$("a").filter(function(el) {
		return el.rel && el.rel.test(/^lightbox/i);
	});
	
	$$(links).proto({
		 /* Put custom options here */
		loop:true
	}, null, function(el) {
		return (this == el) || ((this.rel.length > 8) && (this.rel == el.rel));
	});
};

window.addEvent("domready", Proto.scanPage);