/*
	fileLoadingImage: '/~cbimport/images/lb-loading.gif',
	fileBottomNavCloseImage: '/~cbimport/images/lb-close.gif',

*/
LightboxOptions = Object.extend({
	fileLoadingImage: '/images/lb-loading.gif',
	fileBottomNavCloseImage: '/images/lb-close.gif',
	overlayOpacity: 0.5,
	animate: true,
	resizeSpeed: 7.5,
	borderSize: 10,
	labelImage: "Image",
	labelOf: "of"
},
window.LightboxOptions || {});
var Lightbox = Class.create();
Lightbox.prototype = {
	imageArray: [],
	activeImage: undefined,
	initialize: function() {
		this.updateImageList();
		this.keyboardAction = this.keyboardAction.bindAsEventListener(this);
		if (LightboxOptions.resizeSpeed > 10) LightboxOptions.resizeSpeed = 10;
		if (LightboxOptions.resizeSpeed < 1) LightboxOptions.resizeSpeed = 1;
		this.resizeDuration = LightboxOptions.animate ? ((11 - LightboxOptions.resizeSpeed) * 0.15) : 0;
		this.overlayDuration = LightboxOptions.animate ? 0.2 : 0;
		var size = (LightboxOptions.animate ? 250 : 1) + 'px';
		var objBody = $$('body')[0];
		objBody.appendChild(Builder.node('div', {
			id: 'overlay'
		}));
		objBody.appendChild(Builder.node('div', {
			id: 'lightbox'
		},
		[Builder.node('div', {
			id: 'outerImageContainer'
		},
		Builder.node('div', {
			id: 'imageContainer'
		},
		[Builder.node('img', {
			id: 'lightboxImage'
		}), Builder.node('div', {
			id: 'hoverNav'
		},
		[Builder.node('a', {
			id: 'prevLink',
			href: '#'
		}), Builder.node('a', {
			id: 'nextLink',
			href: '#'
		})]), Builder.node('div', {
			id: 'loading'
		},
		Builder.node('a', {
			id: 'loadingLink',
			href: '#'
		},
		Builder.node('img', {
			src: LightboxOptions.fileLoadingImage
		})))])), Builder.node('div', {
			id: 'imageDataContainer'
		},
		Builder.node('div', {
			id: 'imageData'
		},
		[Builder.node('div', {
			id: 'imageDetails'
		},
		[Builder.node('span', {
			id: 'caption'
		}), Builder.node('span', {
			id: 'numberDisplay'
		})]), Builder.node('div', {
			id: 'bottomNav'
		},
		Builder.node('a', {
			id: 'bottomNavClose',
			href: '#'
		},
		Builder.node('img', {
			src: LightboxOptions.fileBottomNavCloseImage
		})))]))]));
		$('overlay').hide().observe('click', (function() {
			this.end();
		}).bind(this));
		$('lightbox').hide().observe('click', (function(event) {
			if (event.element().id == 'lightbox') this.end();
		}).bind(this));
		$('outerImageContainer').setStyle({
			width: size,
			height: size
		});
		$('prevLink').observe('click', (function(event) {
			event.stop();
			this.changeImage(this.activeImage - 1);
		}).bindAsEventListener(this));
		$('nextLink').observe('click', (function(event) {
			event.stop();
			this.changeImage(this.activeImage + 1);
		}).bindAsEventListener(this));
		$('loadingLink').observe('click', (function(event) {
			event.stop();
			this.end();
		}).bind(this));
		$('bottomNavClose').observe('click', (function(event) {
			event.stop();
			this.end();
		}).bind(this));
		var th = this;
		(function() {
			var ids = 'overlay lightbox outerImageContainer imageContainer lightboxImage hoverNav prevLink nextLink loading loadingLink ' + 'imageDataContainer imageData imageDetails caption numberDisplay bottomNav bottomNavClose';
			$w(ids).each(function(id) {
				th[id] = $(id);
			});
		}).defer();
	},
	updateImageList: function() {
		this.updateImageList = Prototype.emptyFunction;
		document.observe('click', (function(event) {
			var target = event.findElement('a[rel^=lightbox]') || event.findElement('area[rel^=lightbox]');
			if (target) {
				event.stop();
				this.start(target);
			}
		}).bind(this));
	},
	start: function(imageLink) {
		$$('select', 'object', 'embed').each(function(node) {
			node.style.visibility = 'hidden'
		});
		var arrayPageSize = this.getPageSize();
		$('overlay').setStyle({
			width: arrayPageSize[0] + 'px',
			height: arrayPageSize[1] + 'px'
		});
		new Effect.Appear(this.overlay, {
			duration: this.overlayDuration,
			from: 0.0,
			to: LightboxOptions.overlayOpacity
		});
		this.imageArray = [];
		var imageNum = 0;
		if ((imageLink.rel == 'lightbox')) {
			this.imageArray.push([imageLink.href, imageLink.title]);
		} else {
			this.imageArray = $$(imageLink.tagName + '[href][rel="' + imageLink.rel + '"]').collect(function(anchor) {
				return [anchor.href, anchor.title];
			}).uniq();
			while (this.imageArray[imageNum][0] != imageLink.href) {
				imageNum++;
			}
		}
		var arrayPageScroll = document.viewport.getScrollOffsets();
		var lightboxTop = arrayPageScroll[1] + (document.viewport.getHeight() / 10);
		var lightboxLeft = arrayPageScroll[0];
		this.lightbox.setStyle({
			top: lightboxTop + 'px',
			left: lightboxLeft + 'px'
		}).show();
		this.changeImage(imageNum);
	},
	changeImage: function(imageNum) {
		this.activeImage = imageNum;
		if (LightboxOptions.animate) this.loading.show();
		this.lightboxImage.hide();
		this.hoverNav.hide();
		this.prevLink.hide();
		this.nextLink.hide();
		this.imageDataContainer.setStyle({
			opacity: .0001
		});
		this.numberDisplay.hide();
		var imgPreloader = new Image();
		imgPreloader.onload = (function() {
			this.lightboxImage.src = this.imageArray[this.activeImage][0];
			this.resizeImageContainer(imgPreloader.width, imgPreloader.height);
		}).bind(this);
		imgPreloader.src = this.imageArray[this.activeImage][0];
	},
	resizeImageContainer: function(imgWidth, imgHeight) {
		var widthCurrent = this.outerImageContainer.getWidth();
		var heightCurrent = this.outerImageContainer.getHeight();
		var widthNew = (imgWidth + LightboxOptions.borderSize * 2);
		var heightNew = (imgHeight + LightboxOptions.borderSize * 2);
		var xScale = (widthNew / widthCurrent) * 100;
		var yScale = (heightNew / heightCurrent) * 100;
		var wDiff = widthCurrent - widthNew;
		var hDiff = heightCurrent - heightNew;
		if (hDiff != 0) new Effect.Scale(this.outerImageContainer, yScale, {
			scaleX: false,
			duration: this.resizeDuration,
			queue: 'front'
		});
		if (wDiff != 0) new Effect.Scale(this.outerImageContainer, xScale, {
			scaleY: false,
			duration: this.resizeDuration,
			delay: this.resizeDuration
		});
		var timeout = 0;
		if ((hDiff == 0) && (wDiff == 0)) {
			timeout = 100;
			if (Prototype.Browser.IE) timeout = 250;
		} (function() {
			this.prevLink.setStyle({
				height: imgHeight + 'px'
			});
			this.nextLink.setStyle({
				height: imgHeight + 'px'
			});
			this.imageDataContainer.setStyle({
				width: widthNew + 'px'
			});
			this.showImage();
		}).bind(this).delay(timeout / 1000);
	},
	showImage: function() {
		this.loading.hide();
		new Effect.Appear(this.lightboxImage, {
			duration: this.resizeDuration,
			queue: 'end',
			afterFinish: (function() {
				this.updateDetails();
			}).bind(this)
		});
		this.preloadNeighborImages();
	},
	updateDetails: function() {
		if (this.imageArray[this.activeImage][1] != "") {
			this.caption.update(this.imageArray[this.activeImage][1]).show();
		}
		if (this.imageArray.length > 1) {
			this.numberDisplay.update(LightboxOptions.labelImage + ' ' + (this.activeImage + 1) + ' ' + LightboxOptions.labelOf + ' ' + this.imageArray.length).show();
		}
		new Effect.Parallel([new Effect.SlideDown(this.imageDataContainer, {
			sync: true,
			duration: this.resizeDuration,
			from: 0.0,
			to: 1.0
		}), new Effect.Appear(this.imageDataContainer, {
			sync: true,
			duration: this.resizeDuration
		})], {
			duration: this.resizeDuration,
			afterFinish: (function() {
				var arrayPageSize = this.getPageSize();
				this.overlay.setStyle({
					height: arrayPageSize[1] + 'px'
				});
				this.updateNav();
			}).bind(this)
		});
	},
	updateNav: function() {
		this.hoverNav.show();
		if (this.activeImage > 0) this.prevLink.show();
		if (this.activeImage < (this.imageArray.length - 1)) this.nextLink.show();
		this.enableKeyboardNav();
	},
	enableKeyboardNav: function() {
		document.observe('keydown', this.keyboardAction);
	},
	disableKeyboardNav: function() {
		document.stopObserving('keydown', this.keyboardAction);
	},
	keyboardAction: function(event) {
		var keycode = event.keyCode;
		var escapeKey;
		if (event.DOM_VK_ESCAPE) {
			escapeKey = event.DOM_VK_ESCAPE;
		} else {
			escapeKey = 27;
		}
		var key = String.fromCharCode(keycode).toLowerCase();
		if (key.match(/x|o|c/) || (keycode == escapeKey)) {
			this.end();
		} else if ((key == 'p') || (keycode == 37)) {
			if (this.activeImage != 0) {
				this.disableKeyboardNav();
				this.changeImage(this.activeImage - 1);
			}
		} else if ((key == 'n') || (keycode == 39)) {
			if (this.activeImage != (this.imageArray.length - 1)) {
				this.disableKeyboardNav();
				this.changeImage(this.activeImage + 1);
			}
		}
	},
	preloadNeighborImages: function() {
		var preloadNextImage, preloadPrevImage;
		if (this.imageArray.length > this.activeImage + 1) {
			preloadNextImage = new Image();
			preloadNextImage.src = this.imageArray[this.activeImage + 1][0];
		}
		if (this.activeImage > 0) {
			preloadPrevImage = new Image();
			preloadPrevImage.src = this.imageArray[this.activeImage - 1][0];
		}
	},
	end: function() {
		this.disableKeyboardNav();
		this.lightbox.hide();
		new Effect.Fade(this.overlay, {
			duration: this.overlayDuration
		});
		$$('select', 'object', 'embed').each(function(node) {
			node.style.visibility = 'visible'
		});
	},
	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) {
			xScroll = document.body.scrollWidth;
			yScroll = document.body.scrollHeight;
		} else {
			xScroll = document.body.offsetWidth;
			yScroll = document.body.offsetHeight;
		}
		var windowWidth, windowHeight;
		if (self.innerHeight) {
			if (document.documentElement.clientWidth) {
				windowWidth = document.documentElement.clientWidth;
			} else {
				windowWidth = self.innerWidth;
			}
			windowHeight = self.innerHeight;
		} else if (document.documentElement && document.documentElement.clientHeight) {
			windowWidth = document.documentElement.clientWidth;
			windowHeight = document.documentElement.clientHeight;
		} else if (document.body) {
			windowWidth = document.body.clientWidth;
			windowHeight = document.body.clientHeight;
		}
		if (yScroll < windowHeight) {
			pageHeight = windowHeight;
		} else {
			pageHeight = yScroll;
		}
		if (xScroll < windowWidth) {
			pageWidth = xScroll;
		} else {
			pageWidth = windowWidth;
		}
		return [pageWidth, pageHeight];
	}
}
document.observe('dom:loaded',
function() {
	new Lightbox();
});