LightboxOptions = Object.extend({
    fileLoadingImage: 'images/loading.gif',
    fileBottomNavCloseImage: 'images/closelabel.gif',
    overlayOpacity: 0.8,
    animate: true,
    resizeSpeed: 7,
    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(); });