/**
* jQuery Lightbox
* Version 0.5 - 11/29/2007
* @author Warren Krewenki
*
* This package is distributed under the BSD license.
* For full license information, see LICENSE.TXT
*
* Based on Lightbox 2 by Lokesh Dhakar (http://www.huddletogether.com/projects/lightbox2/)
* Originally written to make use of the Prototype framework, and Script.acalo.us, now altered to use jQuery.
*
*
**/
 
(function($){
 
  $.fn.lightbox = function(options){
    // build main options
    var opts = $.extend({}, $.fn.lightbox.defaults, options);
        
    return this.each(function(){
      $(this).click(function(){
         // initalize the lightbox
         initialize();
        start(this);
        return false;
      });
    });
    
   /**
   * initalize()
   *
   * @return void
   * @author Warren Krewenki
   */
  
   function initialize() {
     $('#overlay').remove();
     $('#lightbox').remove();
     opts.inprogress = false;
    
     // if jsonData, build the imageArray from data provided in JSON format
            if(opts.jsonData && opts.jsonData.length > 0) {
                var parser = opts.jsonDataParser ? opts.jsonDataParser : $.fn.lightbox.parseJsonData;
                opts.imageArray = [];
                opts.imageArray = parser(opts.jsonData);
   }
    
     var outerImage = '<div id="outerImageContainer"><div id="imageContainer"><iframe id="lightboxIframe" /><img id="lightboxImage"><div id="hoverNav"><a href="javascript://" title="' + opts.strings.prevLinkTitle + '" id="prevLink"></a><a href="javascript://" id="nextLink" title="' + opts.strings.nextLinkTitle + '"></a></div><div id="loading"><a href="javascript://" id="loadingLink"><img src="'+opts.fileLoadingImage+'"></a></div></div></div>';
     var imageData = '<div id="imageDataContainer" class="clearfix"><div id="imageData"><div id="imageDetails"><span id="caption"></span><span id="numberDisplay"></span></div><div id="bottomNav">';
 
     if (opts.displayHelp)
       imageData += '<span id="helpDisplay">' + opts.strings.help + '</span>';
 
     imageData += '<a href="javascript://" id="bottomNavClose" title="' + opts.strings.closeTitle + '"><img src="'+opts.fileBottomNavCloseImage+'"></a></div></div></div>';
 
     var string;
 
     if (opts.navbarOnTop) {
     string = '<div id="overlay"></div><div id="lightbox">' + imageData + outerImage + '</div>';
     $("body").append(string);
     $("#imageDataContainer").addClass('ontop');
     } else {
     string = '<div id="overlay"></div><div id="lightbox">' + outerImage + imageData + '</div>';
     $("body").append(string);
     }
 
     $("#overlay").click(function(){ end(); }).hide();
     $("#lightbox").click(function(){ end();}).hide();
     $("#loadingLink").click(function(){ end(); return false;});
     $("#bottomNavClose").click(function(){ end(); return false; });
     $('#outerImageContainer').width(opts.widthCurrent).height(opts.heightCurrent);
     $('#imageDataContainer').width(opts.widthCurrent);
    
     if (!opts.imageClickClose) {
            $("#lightboxImage").click(function(){ return false; });
            $("#hoverNav").click(function(){ return false; });
     }
   };
  
   function getPageSize() {
     var jqueryPageSize = new Array($(document).width(),$(document).height(), $(window).width(), $(window).height());
     return jqueryPageSize;
   };
  
   function getPageScroll() {
     var xScroll, yScroll;
 
     if (self.pageYOffset) {
       yScroll = self.pageYOffset;
       xScroll = self.pageXOffset;
     } else if (document.documentElement && document.documentElement.scrollTop){ // Explorer 6 Strict
       yScroll = document.documentElement.scrollTop;
       xScroll = document.documentElement.scrollLeft;
     } else if (document.body) {// all other Explorers
       yScroll = document.body.scrollTop;
       xScroll = document.body.scrollLeft;
     }
 
     var arrayPageScroll = new Array(xScroll,yScroll);
     return arrayPageScroll;
   };
  
   function pause(ms) {
     var date = new Date();
     var curDate = null;
     do{curDate = new Date();}
     while(curDate - date < ms);
   };
  
   function start(imageLink) {
     $("select, embed, object").hide();
     var arrayPageSize = getPageSize();
     $("#overlay").hide().css({width: '100%', height: arrayPageSize[1]+'px', opacity : opts.overlayOpacity}).fadeIn();
     imageNum = 0;
 
     // if data is not provided by jsonData parameter
            if(!opts.jsonData) {
                opts.imageArray = [];
     // if image is NOT part of a set..
     if(!imageLink.rel || (imageLink.rel == '')){
       // add single image to Lightbox.imageArray
       opts.imageArray.push(new Array(imageLink.href, opts.displayTitle ? imageLink.title : ''));
     } else {
     // if image is part of a set..
       $("a").each(function(){
         if(this.href && (this.rel == imageLink.rel)){
           opts.imageArray.push(new Array(this.href, opts.displayTitle ? this.title : ''));
         }
       });
     }
     }
    
     if(opts.imageArray.length > 1) {
     for(i = 0; i < opts.imageArray.length; i++){
         for(j = opts.imageArray.length-1; j>i; j--){
           if(opts.imageArray[i][0] == opts.imageArray[j][0]){
             opts.imageArray.splice(j,1);
           }
         }
       }
       while(opts.imageArray[imageNum][0] != imageLink.href) { imageNum++;}
     }
 
     // calculate top and left offset for the lightbox
     var arrayPageScroll = getPageScroll();
     var lightboxTop = arrayPageScroll[1] + (arrayPageSize[3] / 10);
     var lightboxLeft = arrayPageScroll[0];
     $('#lightbox').css({top: lightboxTop+'px', left: lightboxLeft+'px'}).show();
 
 
     if (!opts.slideNavBar)
       $('#imageData').hide();
 
     changeImage(imageNum);
   };
  
   function changeImage(imageNum) {
     if(opts.inprogress == false){
       opts.inprogress = true;
       opts.activeImage = imageNum;  // update global var
 
       // hide elements during transition
       $('#loading').show();
       $('#lightboxImage').hide();
       $('#hoverNav').hide();
       $('#prevLink').hide();
       $('#nextLink').hide();
 
       if (opts.slideNavBar) { // delay preloading image until navbar will slide up
         // $('#imageDataContainer').slideUp(opts.navBarSlideSpeed, $.fn.doChangeImage);
         $('#imageDataContainer').hide();
         $('#imageData').hide();
         doChangeImage();
       } else {
       doChangeImage();
       }
     }
   };
  
   function doChangeImage() {
 
     imgPreloader = new Image();
 
     // once image is preloaded, resize image container
     imgPreloader.onload=function(){
     var newWidth = imgPreloader.width;
     var newHeight = imgPreloader.height;
 
 
       if (opts.fitToScreen) {
     var arrayPageSize = getPageSize();
         var ratio;
         var initialPageWidth = arrayPageSize[2] - 2 * opts.borderSize;
         var initialPageHeight = arrayPageSize[3] - 200;
 
         if (imgPreloader.height > initialPageHeight)
         {
           newWidth = parseInt((initialPageHeight/imgPreloader.height) * imgPreloader.width);
           newHeight = initialPageHeight;
         }
         else if (imgPreloader.width > initialPageWidth)
         {
           newHeight = parseInt((initialPageWidth/imgPreloader.width) * imgPreloader.height);
           newWidth = initialPageWidth;
         }
       }
 
       $('#lightboxImage').attr('src', opts.imageArray[opts.activeImage][0])
               .width(newWidth).height(newHeight);
       resizeImageContainer(newWidth, newHeight);
     };
 
     imgPreloader.src = opts.imageArray[opts.activeImage][0];
   };
  
   function end() {
     disableKeyboardNav();
     $('#lightbox').hide();
     $('#overlay').fadeOut();
     $('select, object, embed').show();
   };
  
   function preloadNeighborImages(){
     if(opts.loopImages && opts.imageArray.length > 1) {
   preloadNextImage = new Image();
   preloadNextImage.src = opts.imageArray[(opts.activeImage == (opts.imageArray.length - 1)) ? 0 : opts.activeImage + 1][0]
  
   preloadPrevImage = new Image();
   preloadPrevImage.src = opts.imageArray[(opts.activeImage == 0) ? (opts.imageArray.length - 1) : opts.activeImage - 1][0]
   } else {
     if((opts.imageArray.length - 1) > opts.activeImage){
       preloadNextImage = new Image();
       preloadNextImage.src = opts.imageArray[opts.activeImage + 1][0];
     }
     if(opts.activeImage > 0){
       preloadPrevImage = new Image();
       preloadPrevImage.src = opts.imageArray[opts.activeImage - 1][0];
     }
   }
   };
  
   function resizeImageContainer(imgWidth, imgHeight) {
     // get current width and height
     opts.widthCurrent = $("#outerImageContainer").outerWidth();
     opts.heightCurrent = $("#outerImageContainer").outerHeight();
            
     // get new width and height
     var widthNew = (imgWidth + (opts.borderSize * 2));
     var heightNew = (imgHeight + (opts.borderSize * 2));
 
     // scalars based on change from old to new
     opts.xScale = ( widthNew / opts.widthCurrent) * 100;
     opts.yScale = ( heightNew / opts.heightCurrent) * 100;
 
     // calculate size difference between new and old image, and resize if necessary
     wDiff = opts.widthCurrent - widthNew;
     hDiff = opts.heightCurrent - heightNew;
 
     $('#imageDataContainer').animate({width: widthNew},opts.resizeSpeed,'linear');
     $('#outerImageContainer').animate({width: widthNew},opts.resizeSpeed,'linear',function(){
       $('#outerImageContainer').animate({height: heightNew},opts.resizeSpeed,'linear',function(){
         showImage();
       });
     });
 
     // if new and old image are same size and no scaling transition is necessary,
     // do a quick pause to prevent image flicker.
     if((hDiff == 0) && (wDiff == 0)){
       if (jQuery.browser.msie){ pause(250); } else { pause(100);}
     }
 
     $('#prevLink').height(imgHeight);
     $('#nextLink').height(imgHeight);
   };
  
   function showImage() {
     $('#loading').hide();
     $('#lightboxImage').fadeIn("fast");
     updateDetails();
     preloadNeighborImages();
 
     opts.inprogress = false;
   };
  
   function updateDetails() {
 
     $('#numberDisplay').html('');
 
     if(opts.imageArray[opts.activeImage][1]){
       $('#caption').html(opts.imageArray[opts.activeImage][1]).show();
     }
 
     // if image is part of set display 'Image x of x'
     if(opts.imageArray.length > 1){
       var nav_html;
 
       nav_html = opts.strings.image + (opts.activeImage + 1) + opts.strings.of + opts.imageArray.length;
 
       if (!opts.disableNavbarLinks) {
                    // display previous / next text links
                    if ((opts.activeImage) > 0 || opts.loopImages) {
                      nav_html = '<a title="' + opts.strings.prevLinkTitle + '" href="#" id="prevLinkText">' + opts.strings.prevLinkText + "</a>" + nav_html;
                    }
 
                    if (((opts.activeImage + 1) < opts.imageArray.length) || opts.loopImages) {
                      nav_html += '<a title="' + opts.strings.nextLinkTitle + '" href="#" id="nextLinkText">' + opts.strings.nextLinkText + "</a>";
                    }
                }
 
       $('#numberDisplay').html(nav_html).show();
     }
 
     if (opts.slideNavBar) {
     $("#imageData").slideDown(opts.navBarSlideSpeed);
     } else {
       $("#imageData").show();
     }
 
     var arrayPageSize = getPageSize();
     $('#overlay').height(arrayPageSize[1]);
     updateNav();
   };
  
   function updateNav() {
     if(opts.imageArray.length > 1){
       $('#hoverNav').show();
                
                // if loopImages is true, always show next and prev image buttons
                if(opts.loopImages) {
     $('#prevLink,#prevLinkText').show().click(function(){
       changeImage((opts.activeImage == 0) ? (opts.imageArray.length - 1) : opts.activeImage - 1); return false;
     });
    
     $('#nextLink,#nextLinkText').show().click(function(){
       changeImage((opts.activeImage == (opts.imageArray.length - 1)) ? 0 : opts.activeImage + 1); return false;
     });
    
     } else {
       // if not first image in set, display prev image button
       if(opts.activeImage != 0){
         $('#prevLink,#prevLinkText').show().click(function(){
           changeImage(opts.activeImage - 1); return false;
         });
       }
 
       // if not last image in set, display next image button
       if(opts.activeImage != (opts.imageArray.length - 1)){
         $('#nextLink,#nextLinkText').show().click(function(){
 
           changeImage(opts.activeImage +1); return false;
         });
       }
                }
                
       enableKeyboardNav();
     }
   };
  
   function keyboardAction(e) {
            var o = e.data.opts
     var keycode = e.keyCode;
     var escapeKey = 27;
            
     var key = String.fromCharCode(keycode).toLowerCase();
            
     if((key == 'x') || (key == 'o') || (key == 'c') || (keycode == escapeKey)){ // close lightbox
       end();
     } else if((key == 'p') || (keycode == 37)){ // display previous image
     if(o.loopImages) {
     disableKeyboardNav();
     changeImage((o.activeImage == 0) ? (o.imageArray.length - 1) : o.activeImage - 1);
     }
     else if(o.activeImage != 0){
         disableKeyboardNav();
         changeImage(o.activeImage - 1);
       }
     } else if((key == 'n') || (keycode == 39)){ // display next image
     if (opts.loopImages) {
     disableKeyboardNav();
     changeImage((o.activeImage == (o.imageArray.length - 1)) ? 0 : o.activeImage + 1);
     }
       else if(o.activeImage != (o.imageArray.length - 1)){
         disableKeyboardNav();
         changeImage(o.activeImage + 1);
       }
     }
   };
  
   function enableKeyboardNav() {
     $(document).bind('keydown', {opts: opts}, keyboardAction);
   };
 
   function disableKeyboardNav() {
     $(document).unbind('keydown');
   };
  
  };
    
    $.fn.lightbox.parseJsonData = function(data) {
        var imageArray = [];
        
        $.each(data, function(){
            imageArray.push(new Array(this.url, this.title));
        });
        
        return imageArray;
    };
 
  $.fn.lightbox.defaults = {
    fileLoadingImage : 'images/lightbox/loading.gif',
    fileBottomNavCloseImage : 'images/lightbox/closelabel.gif',
    overlayOpacity : 0.8,
    borderSize : 10,
    imageArray : new Array,
    activeImage : null,
    inprogress : false,
    resizeSpeed : 350,
    widthCurrent: 250,
    heightCurrent: 250,
    xScale : 1,
    yScale : 1,
    displayTitle: true,
    navbarOnTop: false,
    slideNavBar: false, // slide nav bar up/down between image resizing transitions
    navBarSlideSpeed: 350,
    displayHelp: false,
    strings : {
      help: ' \u2190 / P - previous image\u00a0\u00a0\u00a0\u00a0\u2192 / N - next image\u00a0\u00a0\u00a0\u00a0ESC / X - close image gallery',
      prevLinkTitle: 'previous image',
      nextLinkTitle: 'next image',
      prevLinkText: '&laquo; Previous',
      nextLinkText: 'Next &raquo;',
      closeTitle: 'close image gallery',
      image: 'Image ',
      of: ' of '
    },
    fitToScreen: false,    // resize images if they are bigger than window
        disableNavbarLinks: false,
        loopImages: false,
        imageClickClose: true,
        jsonData: null,
        jsonDataParser: null
  };
  
})(jQuery);