// Effect.Tooltip
// Nick Stakenburg

// Usage : new Effect.Tooltip(element, content, {title : 'title', className: 'class', offset: {x:0, y:0}});
// <script type='text/javascript'>
// function init() {
// 	new Effect.Tooltip('tip1', 'Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt.', {className: 'tip', title : 'Lorem Ipsum'});
// 	new Effect.Tooltip('tip2', 'offset {x:100,y:15}', {title: 'Tooltip with offset', className: 'darkborder', offset: {x:100, y:15}});
// 	new Effect.Tooltip('tip3', 'Simple tooltip', {className: 'tip'});
// }
// Event.observe(window, 'load', init, false);
// </script>

Effect.Tooltip = Class.create();
Object.extend(Object.extend(Effect.Tooltip.prototype, Effect.Base.prototype), {
  initialize: function(element, content) {
    this.element = $(element);
    if(!this.element) throw(Effect._elementDoesNotExistError);
    var options = Object.extend({
      content: content,
      title: false,
      className: 'tooltip',
      offset: {'x':16, 'y':16}
    }, arguments[2] || {});
    this.start(options);
  },
  setup: function() {
    // create a wrapper
    this.wrapper = document.createElement('div');
    this.wrapper.className = this.options.className;
    Element.setStyle(this.wrapper, {
      position: 'absolute',
      display: 'none'
    });
    // add the title
    if(this.options.title) {
      var title = document.createElement('div');
      title.className = 'title';
      Element.update(title, this.options.title);
      this.wrapper.appendChild(title);
    }
    // create the actual tooltip
    this.tip = document.createElement('div');
    this.tip.className = 'content';
    Element.update(this.tip, this.options.content);
    this.wrapper.appendChild(this.tip);

    // add wrapper to the body
    document.body.appendChild(this.wrapper);

    // add observers
    this.element.observe('mousemove', this.showTip.bind(this));
    this.element.observe('mouseout', this.hideTip.bind(this));
  },
  showTip: function(event){
    this.positionTip(event);
    this.wrapper.show();
  },
  hideTip: function(){
    this.wrapper.hide();
  },
  positionTip: function(event){
    var offsets = {'x': this.options.offset['x'],'y': this.options.offset['y']};
    var mouse = {'x': Event.pointerX(event), 'y': Event.pointerY(event)};
    var page = {'x':this.viewportSize()['x'], 'y':this.viewportSize()['y']};
    var tip = {'x': mouse['x'] + this.options.offset['x'] + this.wrapper.getWidth(),
    'y' : mouse['y'] + this.options.offset['y'] + this.wrapper.getHeight()};
    var window = {'x':this.windowPosition()['x'], 
    'y':this.windowPosition()['y'], 
    'w':this.windowSize()['w'], 
    'h':this.windowSize()['h']};

    // inverse x or y to keep tooltip within viewport
    if(tip['x']>page['x']) { offsets['x'] = 0-(this.wrapper.getWidth() + this.options.offset['x']); }
 //   if(tip['y']>page['y']) { offsets['y'] = 0-(this.wrapper.getHeight() + this.options.offset['y']); } 
 
    if(tip['y'] > window['h'] + window['y']) { offsets['y'] = -(mouse['y'] + this.wrapper.getHeight() -  window['h'] - window['y']); }    
    if(mouse['y'] + offsets['y'] < window['y']) { offsets['y'] = -mouse['y'] + window['y']; }  
        
    this.wrapper.setStyle({
      left: mouse['x'] + offsets['x'] + 'px',
      top: mouse['y'] + offsets['y'] + 'px'
    });
  },
  viewportSize : function(){
    if (self.innerHeight) return {'x': self.innerWidth, 'y': self.innerHeight};
    else if (document.documentElement && document.documentElement.clientHeight)
    return {'x': document.documentElement.clientWidth, 'y': document.documentElement.clientHeight};
    else if (document.body) return {'x': document.body.clientWidth, 'y': document.body.clientHeight};
  },  
  windowPosition : function(){
    if( typeof( window.pageYOffset ) == 'number' ) return {'x': window.pageXOffset, 'y': window.pageYOffset};
    else if( document.body) 
    return {'x': document.body.scrollLeft, 'y': document.body.scrollTop};
    else if( document.documentElement) 
    return {'x': document.documentElement.scrollLeft, 'y': document.documentElement.scrollTop};
  },  
  windowSize : function(){
    if( typeof( window.innerWidth ) == 'number' ) return {'w': window.innerWidth, 'h': myHeight = window.innerHeight};
    else if( document.body) 
    return {'w': document.body.clientWidth, 'h': document.body.clientHeight};
    else if( document.documentElement) 
    return {'w': document.documentElement.clientWidth, 'h': document.documentElement.clientHeight};
  } 
});