/*

TagCloud jQuery plugin

var tags = [{tag: "computers", count: 56}, {tag: "mobile" , count :12}, ... ];
$("#tagcloud"}.tagCloud(tags);

*/

jQuery.fn.tagCloud = function(cl, givenOptions) {
   if (!cl || !cl.length)
      return this;

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

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

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

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

   var diff = ( max == min ? 1
                           : (max - min) / (options.maxFontSizeEm - 1));
   function getNormalizedSize(count) {
      return 0.6 + ((count - min) / diff) * 0.7;
   }

   this.empty();
   for (var i = 0; i < cl.length; ++i) {
      var tag = cl[i].tag;
      var tagEl = jQuery('<a href="" class="tagcloudlink" db-id="' + cl[i].id + '" style="font-size: '
                           + getNormalizedSize(cl[i].count)
                           + '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;
}