/**
 * jQuery Lightbox
 * Version 0.5 - 11/29/2007
 * @author Warren Krewenki
 *
 * Changes by:
 * @author Krzysztof Kotowicz <koto at webworkers dot pl>:
 *  - bugfix: multiple instances of Lightbox galleries allowed
 *    (using opts variable instead of $.fn.lightbox.defaults)
 *  - bugfix: use var for local variables in a few functions
 *  - added support for navbarOnTop setting
 *  - added support for displayTitle setting
 *  - added support for slideNavBar setting (with slideNavBarSpeed)
 *  - added support for displayHelp setting
 *  - added support for fitToScreen setting (ported Lightbox VinDSL hack)
 *    (see http://www.huddletogether.com/forum/comments.php?DiscussionID=307)
 *  - plugin now uses jQuery.width() and jQuery.height()
 *  - removed eval() calls
 *  - removed destroyElement - uses jQuery.remove()
 *  - use of prevLinkText, nextLinkText and help
 *  - all strings are now placed in opts.strings to allow for customization/translation
 *
 * 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;
         });
      });
   };

   // lightbox functions
   $.fn.lightbox.initialize = function(){
      $('#overlay').remove();
      $('#lightbox').remove();
      opts.inprogress = false;
      var outerImage = '<div id="outerImageContainer"><div id="imageContainer"><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 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;
      }

      var arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight);
      return arrayPageSize;
   };


   $.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;

      var anchors = document.getElementsByTagName( imageLink.tagName);

      // 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(){

      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(){
      $('#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/lightbox/loading.gif',
      fileBottomNavCloseImage : '/images/lightbox/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: 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: 'предыдущее изображение',
         nextLinkTitle: 'следующее изображение',
         prevLinkText:  '&laquo; Назад',
         nextLinkText:  'Вперед &raquo;',
         closeTitle: 'Закрыть',
         image: 'Изображение ',
         of: ' из '
      },
      fitToScreen: false      // resize images if they are bigger than window
   };
})(jQuery);