/**
 * jQuery Lightbox
 * Version 0.5 - 11/29/2007
 * @author Warren Krewenki
 **/

(function($) {
  var opts;
  var documentHeight; // toegevoegd door GHE

  $.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"><div id="imageData"><div id="imageDetails"><span id="caption"></span><span id="numberDisplay"></span></div>'

    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 class="clearfix"></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();
    documentHeight = $(document).height(); // toegevoegd door GHE
    $("#overlay").hide().css({ width: '100%', height: documentHeight + '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();
    documentHeight = $(document).height(); // toegevoegd door GHE
    $('#overlay').height(documentHeight);
    $.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: '/interface/images/lightbox/loading.gif',
    fileBottomNavCloseImage: '/interface/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 - Vorige afbeelding\u00a0\u00a0\u00a0\u00a0\u2192 / N - Volgende afbeelding\u00a0\u00a0\u00a0\u00a0ESC / X - Afbeeldingen sluiten',
      prevLinkTitle: 'Vorige afbeelding',
      nextLinkTitle: 'Volgende afbeelding',
      prevLinkText: '&laquo; Vorige',
      nextLinkText: 'Volgende &raquo;',
      closeTitle: 'Afbeeldingen sluiten',
      image: 'Foto ',
      of: ' van '
    },
    fitToScreen: false		// resize images if they are bigger than window
  };
})(jQuery);