/*
A dynamic JavaScript tag/keyword cloud plugin for jQuery, designed to use with Ajax:
the cloud is generated from an array.

MIT license.

Schaffer Kriszti
http://woophoo.com

Configuration:
--------------
Optionally you can pass a configuration object to tagCloud as the second
parameter. Allowed settings are:

maxFontSizeEm: Size of the largest tag in the cloud in css 'em'. The smallest
   one's size is 1em so this value is the ratio of the smallest and largest
   sizes.
   default: 4

Styling:
--------
 The plugin adds the "tagcloudlink" class to the generated tag links. Note that
an " " is generated between the links too.

Originally based on DynaCloud v3 by
Johann Burkard
<http://johannburkard.de>
*/

jQuery.fn.tagCloud = function(cl, givenOptions) { //return this.each( function() { //like a real jQuery plugin: run on on each element
   if (!cl || !cl.length)
      return this;

   // Default settings:
   var defaults = {
      sort: function (a, b) {return a.tag < b.tag ? -1 : (a.tag == b.tag ? 0 : 1)},//default sorting: abc
      click: function(tag) {},
      maxFontSizeEm: 4
   }

   var options = {};
   jQuery.extend(options, defaults, givenOptions);

   // calculating the max and min count values
   var max = -1;
   var min = cl[0].den;
   $.each(cl, function(i, n) {
      max = Math.max(n.den, max);
      min = Math.min(n.den, min);
   });

   if (options.sort) {
      cl.sort(options.sort);
   }

   //Normalization helper
   var diff = ( max == min ? 1    // if all values are equal, do not divide by zero
                           : (max - min) / (options.maxFontSizeEm - 1) ); //optimization: Originally we want to divide by diff
                           // and multiple by maxFontSizeEm - 1 in getNormalizedSize.
   function getNormalizedSize(den) {
      return 1 + (den - min) / diff;
   }

   // Generating the output
   this.empty();
   for (var i = 0; i < cl.length; ++i) {
      var tag = cl[i].tag;
      var tagEl = jQuery('<a href="v5searchtext.asp?skey=' + escape(tag) + '" class="tagcloudlink" style="font-size: '
                           + getNormalizedSize(cl[i].den)
                           + 'em">' + tag + '<\/a>')
                  .data('tag', tag);

      if (options.click) {
         tagEl.click(function(event) {
 //           event.preventDefault();
            options.click(jQuery(event.target).data('tag'), event);
         });
      }
      this.append(tagEl).append(" ");
   }
   return this;
//})
}