/**
* 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($){
  var opts;
 
  $.fn.lightbox = function(options){
    // build main options
    opts = $.extend({}, $.fn.lightbox.defaults, options);
 
    // initalize the lightbox
    $.fn.lightbox.initialize();
    return this.each(function(){
      $(this).click(function(){
        $(this).lightbox.start(this);
        return false;
      });
    });
  };
 
  
  
  /**
   * initalize()
   *
   * @return void
   * @author Warren Krewenki
   */
  $.fn.lightbox.initialize = function(){
    $('#overlay').remove();
    $('#lightbox').remove();
    opts.inprogress = false;
    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(){ $.fn.lightbox.end(); }).hide();
    $("#lightbox").click(function(){ $.fn.lightbox.end();}).hide();
    $("#loadingLink").click(function(){ $.fn.lightbox.end(); return false;});
    $("#bottomNavClose").click(function(){ $.fn.lightbox.end(); return false; });
    $('#outerImageContainer').width(opts.widthCurrent).height(opts.heightCurrent);
    $('#imageDataContainer').width(opts.widthCurrent);
  };
 
 
  $.fn.lightbox.getPageSize = function(){
    var jqueryPageSize = new Array($(document).width(),$(document).height(), $(window).width(), $(window).height());
    return jqueryPageSize;
  };
 
 
  $.fn.lightbox.getPageScroll = function(){
    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;
  };
 
  $.fn.lightbox.pause = function(ms){
    var date = new Date();
    var curDate = null;
    do{curDate = new Date();}
    while( curDate - date < ms);
  };
 
  $.fn.lightbox.start = function(imageLink){
    
    $("select, embed, object").hide();
    var arrayPageSize = $.fn.lightbox.getPageSize();
    $("#overlay").hide().css({width: '100%', height: arrayPageSize[1]+'px', opacity : opts.overlayOpacity}).fadeIn();
    opts.imageArray = [];
    imageNum = 0;
 
 
    // 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 : ''));
        }
      });
 
 
      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 = $.fn.lightbox.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();
 
    $.fn.lightbox.changeImage(imageNum);
 
  };
 
  $.fn.lightbox.changeImage = function(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();
        $.fn.doChangeImage();
      } else {
       $.fn.doChangeImage();
      }
    }
  };
 
  $.fn.doChangeImage = function(){
 
    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 = $.fn.lightbox.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);
      $.fn.lightbox.resizeImageContainer(newWidth, newHeight);
    };
 
    imgPreloader.src = opts.imageArray[opts.activeImage][0];
  };
  
  $.fn.lightbox.end = function(){
    $.fn.lightbox.disableKeyboardNav();
    $('#lightbox').hide();
    $('#overlay').fadeOut();
    $('select, object, embed').show();
  };
 
  $.fn.lightbox.preloadNeighborImages = function(){
    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];
    }
  };
 
  $.fn.lightbox.keyboardAction = function(e){
    if (e == null) { // ie
      var keycode = event.keyCode;
      var escapeKey = 27;
    } else { // mozilla
      var keycode = e.keyCode;
      var escapeKey = e.DOM_VK_ESCAPE;
    }
 
    var key = String.fromCharCode(keycode).toLowerCase();
 
    if((key == 'x') || (key == 'o') || (key == 'c') || (keycode == escapeKey)){ // close lightbox
      $.fn.lightbox.end();
    } else if((key == 'p') || (keycode == 37)){ // display previous image
      if(opts.activeImage != 0){
        $.fn.lightbox.disableKeyboardNav();
        $.fn.lightbox.changeImage(opts.activeImage - 1);
      }
    } else if((key == 'n') || (keycode == 39)){ // display next image
      if(opts.activeImage != (opts.imageArray.length - 1)){
        $.fn.lightbox.disableKeyboardNav();
        $.fn.lightbox.changeImage(opts.activeImage + 1);
      }
    }
  };
 
  $.fn.lightbox.resizeImageContainer = function(imgWidth, imgHeight){
    // get current width and height
    opts.widthCurrent = document.getElementById('outerImageContainer').offsetWidth;
    opts.heightCurrent = document.getElementById('outerImageContainer').offsetHeight;
 
    // 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(){
        $.fn.lightbox.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){ $.fn.lightbox.pause(250); } else { $.fn.lightbox.pause(100);}
    }
 
    $('#prevLink').height(imgHeight);
    $('#nextLink').height(imgHeight);
  };
 
  $.fn.lightbox.showImage = function(){
    $('#loading').hide();
    $('#lightboxImage').fadeIn("fast");
    $.fn.lightbox.updateDetails();
    $.fn.lightbox.preloadNeighborImages();
 
    opts.inprogress = false;
  };
 
  $.fn.lightbox.updateDetails = function(){
 
    $('#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;
 
      // display previous / next text links
      if ((opts.activeImage) > 0) {
        nav_html = '<a title="' + opts.strings.prevLinkTitle + '" href="#" id="prevLinkText">' + opts.strings.prevLinkText + "</a>" + nav_html;
      }
 
      if ((opts.activeImage + 1) < opts.imageArray.length) {
        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 = $.fn.lightbox.getPageSize();
    $('#overlay').height(arrayPageSize[1]);
    $.fn.lightbox.updateNav();
  };
 
  $.fn.lightbox.updateNav = function(){
    if(opts.imageArray.length > 1){
      $('#hoverNav').show();
 
      // if not first image in set, display prev image button
      if(opts.activeImage != 0){
        $('#prevLink,#prevLinkText').show().click(function(){
          $.fn.lightbox.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(){
 
          $.fn.lightbox.changeImage(opts.activeImage +1); return false;
        });
      }
 
      $.fn.lightbox.enableKeyboardNav();
    }
  };
 
 
  $.fn.lightbox.enableKeyboardNav = function(){
    document.onkeydown = $.fn.lightbox.keyboardAction;
  };
 
  $.fn.lightbox.disableKeyboardNav = function(){
    document.onkeydown = '';
  };
 
  $.fn.lightbox.defaults = {
    fileLoadingImage : 'images/loading.gif',
    fileBottomNavCloseImage : 'images/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
  };
})(jQuery);