/**
 * 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.
 *
 * Modified by Godsmurf April 2009 (at @@@@)
 * - put lightbox higher (top=20 instead of windowheight/10)
 * - put BottomNav (close button) before caption in DOM and float right
 * - put imagecount before caption in 1 block
 * TODO- remove title of A-tag, set it as .img_caption of A-tag and thumbnail IMG
 *   --> create tooltip on thumbnail IMG
 **/

(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="bottomNav"><a href="javascript://" id="bottomNavClose" title="' + opts.strings.closeTitle + '"><img src="'+opts.fileBottomNavCloseImage+'"></a></div><div id="imageDetails"><span id="caption"></span></div>';
      if (opts.displayHelp) imageData += '<span id="helpDisplay">' + opts.strings.help + '</span>';
      imageData += '</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
// @@@@ use img_caption property instead of title (also used by tooltip)
//          opts.imageArray.push(new Array(imageLink.href, opts.displayTitle ? imageLink.title : ''));
          opts.imageArray.push(new Array(imageLink.href, opts.displayTitle ? imageLink.img_caption : ''));
        } else {
        // if image is part of a set..
          $("a").each(function(){
            if(this.href && (this.rel == imageLink.rel)){
// @@@@ use img_caption property instead of title (also used by tooltip)
//              opts.imageArray.push(new Array(this.href, opts.displayTitle ? this.title : ''));
              opts.imageArray.push(new Array(this.href, opts.displayTitle ? this.img_caption : ''));
            }
          });
        }
      }

      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] + 20;  //  @@@@ was + (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] - 70; // @@@ (20 topmarge, 2x10 border, 50 caption van 2 lijnen, -10); was - 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() {
      var caption_html;
//        $('#numberDisplay').html('');
      // if image is part of set display 'Image x of x'
      if(opts.imageArray.length > 1){
        caption_html = '(' + opts.strings.image + (opts.activeImage + 1) + opts.strings.of + opts.imageArray.length + ')';
//          $('#numberDisplay').html(nav_html).show();
      }

      // caption
      if(opts.imageArray[opts.activeImage][1]){
        caption_html = caption_html + ' <b>' + opts.imageArray[opts.activeImage][1] + '</b>';
      }

      //
      $('#caption').html(caption_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: '',
      nextLinkTitle: '',
      prevLinkText:  '&laquo; Previous',
      nextLinkText:  'Next &raquo;',
      closeTitle: 'close',
      image: '',
      of: '/'
    },
    fitToScreen: false,   // resize images if they are bigger than window
    disableNavbarLinks: false,
    loopImages: false,
    imageClickClose: true,
    jsonData: null,
    jsonDataParser: null
  };

})(jQuery);