// -----------------------------------------------------------------------------------
//
//	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.
//
// -----------------------------------------------------------------------------------
/*

    Table of Contents
    -----------------
    Configuration

    Lightbox Class Declaration
    - initialize()
    - updateImageList()
    - start()
    - changeImage()
    - resizeImageContainer()
    - showImage()
    - updateDetails()
    - updateNav()
    - enableKeyboardNav()
    - disableKeyboardNav()
    - keyboardAction()
    - preloadNeighborImages()
    - end()
    
    Function Calls
    - document.observe()
   
*/
// -----------------------------------------------------------------------------------

//
//  Configurationl
//
LightboxOptions = Object.extend({
    fileLoadingImage:        '/siteasp/js/lightbox204/images/loading.gif',     
    fileBottomNavCloseImage: '/siteasp/js/lightbox204/images/closelabel.gif',

    overlayOpacity: 0.7,   // controls transparency of shadow overlay

    animate: true,         // toggles resizing animations
    resizeSpeed: 7,        // 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

	// When grouping images this is used to write: Image # of #.
	// Change it for non-english localization
	labelImage: "Slika",
	labelOf: "od"
}, 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';
        

        // Code inserts html at the bottom of the page that looks similar to this:
        //
        //  <div id="overlay"></div>
        //  <div id="lightbox">
        //      <div id="outerImageContainer">
        //          <div id="imageContainer">
        //              <img id="lightboxImage">
        //              <div style="" id="hoverNav">
        //                  <a href="#" id="prevLink"></a>
        //                  <a href="#" id="nextLink"></a>
        //              </div>
        //              <div id="loading">
        //                  <a href="#" id="loadingLink">
        //                      <img src="images/loading.gif">
        //                  </a>
        //              </div>
        //          </div>
        //      </div>
        //      <div id="imageDataContainer">
        //          <div id="imageData">
        //              <div id="imageDetails">
        //                  <span id="caption"></span>
        //                  <span id="numberDisplay"></span>
        //              </div>
        //              <div id="bottomNav">
        //                  <a href="#" id="bottomNavClose">
        //                      <img src="images/close.gif">
        //                  </a>
        //              </div>
        //          </div>
        //      </div>
        //  </div>


        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()
    // 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
        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')){
            // 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++; }
        }

        // calculate top and left offset for the lightbox 
        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()
    //  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.loading.show();
        this.lightboxImage.hide();
        this.hoverNav.hide();
        this.prevLink.hide();
        this.nextLink.hide();
		// HACK: Opera9 does not currently support scriptaculous opacity and appear fx
        this.imageDataContainer.setStyle({opacity: .0001});
        this.numberDisplay.hide();      
        
        var imgPreloader = new Image();
        
        // once image is preloaded, resize image container

        var arrayPageSize = this.getPageSize();

        

        imgPreloader.onload = (function(){
            //GASPER
            if (imgPreloader.width>arrayPageSize[0]){
              ratio=arrayPageSize[0]/imgPreloader.width
              this.lightboxImage.style.width=imgPreloader.width=imgPreloader.width*ratio - 100;
              this.lightboxImage.style.height=imgPreloader.height=imgPreloader.height*ratio - 100;
            }

            if (imgPreloader.height>arrayPageSize[1]){
              ratio=arrayPageSize[1]/imgPreloader.height
              this.lightboxImage.style.width=imgPreloader.width=imgPreloader.width*ratio - 100;
              this.lightboxImage.style.height=imgPreloader.height=imgPreloader.height*ratio - 100;
            }
            

            this.lightboxImage.src = this.imageArray[this.activeImage][0];
            this.resizeImageContainer(imgPreloader.width, imgPreloader.height);
            }).bind(this);
        imgPreloader.src = this.imageArray[this.activeImage][0];


                 },

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

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

                        // 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.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()
                      //  Display image and begin preloading neighbors.
                      //
showImage: function(){
             this.loading.hide();
             new Effect.Appear(this.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.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.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() {
  // update overlay size and update nav
  var arrayPageSize = this.getPageSize();
  this.overlay.setStyle({ height: arrayPageSize[1] + 'px' });
  this.updateNav();
  }).bind(this)
} 
);
                 },

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

             this.hoverNav.show();               

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

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

     //
     //  getPageSize()
     //
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){ // all but Explorer Mac
                 xScroll = document.body.scrollWidth;
                 yScroll = document.body.scrollHeight;
               } else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
                 xScroll = document.body.offsetWidth;
                 yScroll = document.body.offsetHeight;
               }

               var windowWidth, windowHeight;

               if (self.innerHeight) {	// all except Explorer
                 if(document.documentElement.clientWidth){
                   windowWidth = document.documentElement.clientWidth; 
                 } else {
                   windowWidth = self.innerWidth;
                 }
                 windowHeight = self.innerHeight;
               } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
                 windowWidth = document.documentElement.clientWidth;
                 windowHeight = document.documentElement.clientHeight;
               } else if (document.body) { // other Explorers
                 windowWidth = document.body.clientWidth;
                 windowHeight = document.body.clientHeight;
               }	

               // for small pages with total height less then height of the viewport
               if(yScroll < windowHeight){
                 pageHeight = windowHeight;
               } else { 
                 pageHeight = yScroll;
               }

               // for small pages with total width less then width of the viewport
               if(xScroll < windowWidth){	
                 pageWidth = xScroll;		
               } else {
                 pageWidth = windowWidth;
               }

               return [pageWidth,pageHeight];
             }
}

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