/**
 * 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 = Math.max(350, 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/loading.gif',
    fileBottomNavCloseImage : 'images/close.gif',
    overlayOpacity : 0.8,
    borderSize : 10,
    imageArray : new Array,
    activeImage : null,
    inprogress : false,
    resizeSpeed : 350,
    widthCurrent: 250,
    heightCurrent: 250,
    xScale : 1,
    yScale : 1,
    displayTitle: false,
    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: 'forrige billede',
      nextLinkTitle: 'n&aelig;ste billede',
      prevLinkText:  '&laquo; Forrige',
      nextLinkText:  'N&aelig;ste &raquo;',
      closeTitle: 'luk billedegalleriet',
      image: 'Billede ',
      of: ' af '
    },
    fitToScreen: false,   // resize images if they are bigger than window
    disableNavbarLinks: false,
    loopImages: false,
    imageClickClose: true,
    jsonData: null,
    jsonDataParser: null
  };
  
})(jQuery);