// -----------------------------------------------------------------------------------
//
//	Lightbox v2.04
//	by Lokesh Dhakar - http://www.lokeshdhakar.com
//	Last Modification: 2/9/08
//
//	For more information, visit:
//	http://lokeshdhakar.com/projects/lightbox2/
//
//	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
//  	- Free for use in both personal and commercial projects
//		- Attribution requires leaving author name, author link, and the license info intact.
//
//  Thanks: Scott Upton(uptonic.com), Peter-Paul Koch(quirksmode.com), and Thomas Fuchs(mir.aculo.us) for ideas, libs, and snippets.
//  		Artemy Tregubenko (arty.name) for cleanup and help in updating to latest ver of proto-aculous.
//
// -----------------------------------------------------------------------------------
//
//  Configurationl
//
LightboxOptions = Object.extend({
    fileLoadingImage:        'images/lightbox/loading.gif',
    fileBottomNavCloseImage: 'images/lightbox/close.png',

    overlayOpacity: 0.8,   // controls transparency of shadow overlay

    animate: true,         // toggles resizing animations
    resizeSpeed: 6,        // controls the speed of the image resizing animations (1=slowest and 10=fastest)

    borderSize: 10,         //if you adjust the padding in the CSS, you will need to update this variable

    maxHeight : 500 + 40 + 40,  //  maximum image height + 4 X borderSize + ImageDataContainer height declared in css
    maxLength : 750 + 40,

	// When grouping images this is used to write: Image # of #.
	// Change it for non-english localization
	labelImage: "",
	labelOf: ""
}, window.LightboxOptions || {});

// -----------------------------------------------------------------------------------

var Lightbox = Class.create();

Lightbox.prototype = {
    imageArray: [],
    activeImage: undefined,

    // initialize()
    // Constructor runs on completion of the DOM loading. Calls updateImageList and then
    // the function inserts html at the bottom of the page which is used to display the shadow
    // overlay and the image container.
    //
    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;  // shadow fade in/out duration

        // When Lightbox starts it will resize itself from 250 by 250 to the current image dimension.
        // If animations are turned off, it will be hidden as to prevent a flicker of a
        // white 250 by 250 box.
        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:'lb_outerImageContainer'},
                Builder.node('div',{id:'lb_imageContainer'}, [
                    Builder.node('img',{id:'lb_lightboxImage'}),
                    Builder.node('div',{id:'lb_hoverNav'}, [
                        Builder.node('a',{id:'lb_prevLink', href: '#' }),
                        Builder.node('a',{id:'lb_nextLink', href: '#' })
                    ]),
                    Builder.node('div',{id:'lb_loading'},
                        Builder.node('a',{id:'lb_loadingLink', href: '#' },
                            Builder.node('img', {src: LightboxOptions.fileLoadingImage})
                        )
                    )
                ])
            ),
            Builder.node('div', {id:'lb_imageDataContainer'},
                Builder.node('div',{id:'lb_imageData'}, [
                    Builder.node('div',{id:'lb_imageDetails'}, [
                        Builder.node('span',{id:'lb_caption'}),
                        Builder.node('span',{id:'lb_numberDisplay'})
                    ]),
                    Builder.node('div',{id:'lb_bottomNav'},
                        Builder.node('a',{id:'lb_bottomNavClose', href: '#' },
                            Builder.node('img', { src: LightboxOptions.fileBottomNavCloseImage, className: 'mouseover' })
                        )
                    )
                ])
            )
        ]));

        //window.onresize = function(el){this.fitToScreen('overlay')}.bind(this)

        Element.observe(window, 'resize', (function() { this.fitToScreen('overlay') }).bind(this));
 		$('overlay').hide().observe('click', (function() { this.end(); }).bind(this));
		$('lightbox').hide().observe('click', (function(event) { if (event.element().id == 'lightbox') this.end(); }).bind(this));
		$('lb_outerImageContainer').setStyle({ width: size, height: size });
		$('lb_prevLink').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage - 1); }).bindAsEventListener(this));
		$('lb_nextLink').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage + 1); }).bindAsEventListener(this));
		$('lb_loadingLink').observe('click', (function(event) { event.stop(); this.end(); }).bind(this));
		$('lb_bottomNavClose').observe('click', (function(event) { event.stop(); this.end(); }).bind(this));

        var th = this;
        (function(){
            var ids =
                'overlay lightbox lb_outerImageContainer lb_imageContainer lb_lightboxImage lb_hoverNav lb_prevLink lb_nextLink lb_loading lb_loadingLink ' +
                'lb_imageDataContainer lb_imageData lb_imageDetails lb_caption lb_numberDisplay lb_bottomNav lb_bottomNavClose';
            $w(ids).each(function(id){ th[id] = $(id); });
        }).defer();
    },

    //
    // updateImageList()
    // Loops through anchor tags looking for 'lightbox' references and applies onclick
    // events to appropriate links. You can rerun after dynamically adding images w/ajax.
    //
    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()
    //  Display overlay and lightbox. If image is part of a set, add siblings to imageArray.
    //
    start: function(imageLink) {

        $$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'hidden' });

        // stretch overlay to fill page and fade in
        this.fitToScreen(this.overlay)
        new Effect.Appear(this.overlay, { duration: this.overlayDuration, from: 0.0, to: LightboxOptions.overlayOpacity });

        this.imageArray = [];
        var imageNum = 0;

        if ((imageLink.rel == 'lightbox')){
            // if image is NOT part of a set, add single image to imageArray
            this.imageArray.push([imageLink.href, imageLink.title]);
        } else {
            // if image is part of a set..
            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++; }
        }

        this.lightbox.show()
        this.changeImage(imageNum);
    },

    //
    //  changeImage()
    //  Hide most elements and preload image in preparation for resizing image container.
    //
    changeImage: function(imageNum) {

        this.activeImage = imageNum; // update global var

        // hide elements during transition
        if (LightboxOptions.animate) this.lb_loading.show();
        this.lb_lightboxImage.hide();
        this.lb_hoverNav.hide();
        this.lb_prevLink.hide();
        this.lb_nextLink.hide();
		// HACK: Opera9 does not currently support scriptaculous opacity and appear fx
        this.lb_imageDataContainer.setStyle({opacity: .0001});
        this.lb_numberDisplay.hide();

        var imgPreloader = new Image();

        // once image is preloaded, resize image container


        imgPreloader.onload = (function(){
            this.lb_lightboxImage.src = this.imageArray[this.activeImage][0];

/*-----------------------------------------------------------------------------------------------------------*/
        // AY's additions to scale image to screen if necessary
            var imageWidth = imgPreloader.width
            var imageHeight = imgPreloader.height
            var arrayPageSize = document.viewport.getDimensions()
            if (imageWidth + (LightboxOptions.borderSize * 4) > arrayPageSize.width) {
                imageWidth = arrayPageSize.width - (LightboxOptions.borderSize * 4)
                imageHeight = (imageWidth*imgPreloader.height)/imgPreloader.width
            }
            if (imageHeight + (LightboxOptions.borderSize * 4) + 40 > arrayPageSize.height) {
                imageHeight = arrayPageSize.height - (LightboxOptions.borderSize * 4) - 40
                imageWidth = (imageHeight*imgPreloader.width)/imgPreloader.height
            }
            this.lb_lightboxImage.setStyle({width: imageWidth +'px'})
/*-----------------------------------------------------------------------------------------------------------*/

            this.resizeImageContainer(imageWidth, imageHeight);
        }).bind(this);
        imgPreloader.src = this.imageArray[this.activeImage][0];
    },

    //
    //  resizeImageContainer()
    //
    resizeImageContainer: function(imgWidth, imgHeight) {

        // get current width and height
        var widthCurrent  = this.lb_outerImageContainer.getWidth();
        var heightCurrent = this.lb_outerImageContainer.getHeight();

        // get new width and height
        var widthNew  = (imgWidth  + LightboxOptions.borderSize * 2);
        var heightNew = (imgHeight + LightboxOptions.borderSize * 2);

        // scalars based on change from old to new
        var xScale = (widthNew  / widthCurrent)  * 100;
        var yScale = (heightNew / heightCurrent) * 100;

        // calculate size difference between new and old image, and resize if necessary
        var wDiff = widthCurrent - widthNew;
        var hDiff = heightCurrent - heightNew;

        if (hDiff != 0) new Effect.Scale(this.lb_outerImageContainer, yScale, {scaleX: false, duration: this.resizeDuration, queue: 'front'});
        if (wDiff != 0) new Effect.Scale(this.lb_outerImageContainer, xScale, {scaleY: false, duration: this.resizeDuration, delay: this.resizeDuration});

        // if new and old image are same size and no scaling transition is necessary,
        // do a quick pause to prevent image flicker.
        var timeout = 0;
        if ((hDiff == 0) && (wDiff == 0)){
            timeout = 100;
            if (Prototype.Browser.IE) timeout = 250;
        }

        (function(){
            this.lb_prevLink.setStyle({ height: imgHeight + 'px' });
            this.lb_nextLink.setStyle({ height: imgHeight + 'px' });
            this.lb_imageDataContainer.setStyle({ width: widthNew + 'px' });

            this.showImage();
        }).bind(this).delay(timeout / 1000);
    },

    //
    //  showImage()
    //  Display image and begin preloading neighbors.
    //
    showImage: function(){
        this.lb_loading.hide();
        new Effect.Appear(this.lb_lightboxImage, {
            duration: this.resizeDuration,
            queue: 'end',
            afterFinish: (function(){ this.updateDetails(); }).bind(this)
        });
        this.preloadNeighborImages();
    },

    //
    //  updateDetails()
    //  Display caption, image number, and bottom nav.
    //
    updateDetails: function() {

        // if caption is not null
        if (this.imageArray[this.activeImage][1] != ""){
            this.lb_caption.update(this.imageArray[this.activeImage][1]).show();
        }

        // if image is part of set display 'Image x of x'
        if (this.imageArray.length > 1){
            this.lb_numberDisplay.update( LightboxOptions.labelImage + ' ' + (this.activeImage + 1) + ' ' + LightboxOptions.labelOf + '  ' + this.imageArray.length).show();
        }

        new Effect.Parallel(
            [
                new Effect.SlideDown(this.lb_imageDataContainer, { sync: true, duration: this.resizeDuration, from: 0.0, to: 1.0 }),
                new Effect.Appear(this.lb_imageDataContainer, { sync: true, duration: this.resizeDuration })
            ],
            {
                duration: this.resizeDuration,
                afterFinish: (function() {
	                // update overlay size and update nav
	                this.updateNav();
                }).bind(this)
            }
        );
    },

    //
    //  updateNav()
    //  Display appropriate previous and next hover navigation.
    //
    updateNav: function() {

        this.lb_hoverNav.show();

        // if not first image in set, display prev image button
        if (this.activeImage > 0) this.lb_prevLink.show();

        // if not last image in set, display next image button
        if (this.activeImage < (this.imageArray.length - 1)) this.lb_nextLink.show();

        this.enableKeyboardNav();
    },

    //
    //  enableKeyboardNav()
    //
    enableKeyboardNav: function() {
        document.observe('keydown', this.keyboardAction);
    },

    //
    //  disableKeyboardNav()
    //
    disableKeyboardNav: function() {
        document.stopObserving('keydown', this.keyboardAction);
    },

    //
    //  keyboardAction()
    //
    keyboardAction: function(event) {
        var keycode = event.keyCode;

        var escapeKey;
        if (event.DOM_VK_ESCAPE) {  // mozilla
            escapeKey = event.DOM_VK_ESCAPE;
        } else { // ie
            escapeKey = 27;
        }

        var key = String.fromCharCode(keycode).toLowerCase();

        if (key.match(/x|o|c/) || (keycode == escapeKey)){ // close lightbox
            this.end();
        } else if ((key == 'p') || (keycode == 37)){ // display previous image
            if (this.activeImage != 0){
                this.disableKeyboardNav();
                this.changeImage(this.activeImage - 1);
            }
        } else if ((key == 'n') || (keycode == 39)){ // display next image
            if (this.activeImage != (this.imageArray.length - 1)){
                this.disableKeyboardNav();
                this.changeImage(this.activeImage + 1);
            }
        }
    },

    //
    //  preloadNeighborImages()
    //  Preload previous and next images.
    //
    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()
    //
    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' });
    },

    /*----------------------------------------------------------------------------------------------------------------------*/
	// Ara's additions to have images scale down on smaller screens
	fitToScreen: function(boxId){
	    // calculate top and left offset for the lightbox
        var arrayPageScroll = document.viewport.getScrollOffsets();
        var lightboxTop;
        if (LightboxOptions.maxHeight >= document.viewport.getHeight()) {
            lightboxTop = LightboxOptions.borderSize
        } else {
            lightboxTop = (document.viewport.getHeight() - LightboxOptions.maxHeight + LightboxOptions.borderSize*2) /2
        }
        var lightboxLeft = arrayPageScroll[0];
        this.lightbox.setStyle({ top: lightboxTop + 'px', left: lightboxLeft + 'px' })
        var box = $(boxId)
        var pageSize = document.viewport.getDimensions();
        box.setStyle({ width: pageSize.width + 'px', height: pageSize.height + 'px' });
        // End of my code
        /*----------------------------------------------------------------------------------------------------------------------*/
    }
}

document.observe('dom:loaded', function () { new Lightbox(); });