/**
 * 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
 *
 * 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, 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').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 = ' фото ' + (opts.activeImage + 1) + ' из ' + opts.imageArray.length;

      // display previous / next text links
      if ((opts.activeImage) > 0) {
        nav_html = '<a title="' + opts.strings.prevLinkTitle + '" href="#" id="prevLinkText">предыдущая</a>' + nav_html;
      }

      if ((opts.activeImage + 1) < opts.imageArray.length) {
        nav_html += '<a title="' + opts.strings.nextLinkTitle + '" href="#" id="nextLinkText">следующая</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 : '/i/loading.gif',
    fileBottomNavCloseImage : '/i/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: 'Назад',
      nextLinkTitle: 'Вперед',
      prevLinkText:  '&laquo;&laquo;',
      nextLinkText:  '&raquo;&raquo;',
      closeTitle: 'Закрыть',
      image: 'Рис. ',
      of: ' из '
    },
    fitToScreen: false    // resize images if they are bigger than window
  };
})(jQuery);