/*
jQuery Glossary Plugin 0.9

Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.

Copyright 2010 Lars Corneliussen, Michael Jendryschik
Source: https://bitbucket.org/larscorneliussen/jquery.glossary/

Version: 0.9
*/

;(function($) {
var _settings = {
  descriptionClass:"glossary-description"
}
$.fn.glossify = function (settings)
{
  settings = _settings;
  // pregenerate
  for( var i = 0; i < this.length; i++)
  {
      var g = this[i];
      var $g = $(g);
      g.glossTitle = g.title;
      g.title = "";
      
      var $subElement = $g.find('acronym, abbr');
      if ($subElement.length) {
        caption = $subElement[0].title;
        $subElement[0].title = "";
      }
      else
        caption = $g.text();
      
      g.$glossElement = makeGloss(settings, caption, g.glossTitle);
  }
  
  this.mouseover(function glossover(ev){
    this.$glossElement.show();
    followTheMouse(ev, this.$glossElement);
  });
  
  this.mouseout(function() {this.$glossElement.hide();});
  this.mousemove(followTheMouse);
}

function makeGloss(settings, caption, text)
{
  var $div = $('<div><strong/><span/></div>')
  	.css('position', 'absolute')
  	.addClass(settings.descriptionClass)
  	.hide();
  	
  $div.find('strong').text(caption);
  $div.find('span').text(text);
  	
  $('body').append($div);
  return $div;
}

function followTheMouse(ev, $el)
{
	var $el = $el ? $el : this.$glossElement
    
    // relative mouse position
    var rx = ev.clientX;
    var ry = ev.clientY;
    
    // absolute mouse position
    var x = ev.pageX;
    var y = ev.pageY;
    
    var xOffset = 10;
    var yOffset = 10;

    // ip if not enough space
    if ( (rx + $el.width() + xOffset) > $(window).width() )
    {
      x -= $el.width();
      xOffset *= -1;
    }
    
    if ( (ry + $el.height() + yOffset) > $(window).height() )
    {
      y -= $el.height();
      yOffset *= -1;
    }

    $el.css("left", x + xOffset); 
    $el.css("top", y + yOffset); 
}
})(jQuery);