//  Prototip 1.0.2
//  by Nick Stakenburg - http://www.nickstakenburg.com
//  08-08-2007
//
//  More information on this project:
//  http://www.nickstakenburg.com/projects/prototip/
//
//  Licensed under the Creative Commons Attribution 3.0 License
//  http://creativecommons.org/licenses/by/3.0/
//



var Tips = {

  tips: [],

  zIndex: 1200,

  add: function(tip) {

    this.tips.push(tip);

  },



  remove: function(element) {

    var tip = this.tips.find(function(t){ return t.element == $(element); });

    if (!tip) return;



    this.tips = this.tips.reject(function(t) { return t==tip; });

    tip.deactivate();

    if(tip.tooltip) tip.wrapper.remove();

    if(tip.underlay) tip.underlay.remove();

  }

}



var Tip = Class.create();

Tip.prototype = {

  initialize: function(element, content) {

    this.element = $(element);
    Tips.remove(this.element);
    this.content = content;
    this.options = Object.extend({
      className: 'tooltip',
      duration: 0.3,					// duration of the effect
      effect: false,					// false, 'appear' or 'blind'
      hook: false,						// { element: {'topLeft|topRight|bottomLeft|bottomRight'}, tip: {'topLeft|topRight|bottomLeft|bottomRight'}
      offset: (arguments[2] && arguments[2].hook) ? {x:0, y:0} : {x:16, y:16},
      fixed: false,						// follow the mouse if false
      target: this.element,				// or another element
      title: false,
      viewport: true					// keep within viewport if mouse is followed
    }, arguments[2] || {});

    this.target = $(this.options.target);

    if (this.options.hook) {
      this.options.fixed = true;
      this.options.viewport = false;
    }

	if (this.options.effect) {
      this.queue = { position: 'end', limit: 1, scope: ''}
      var c = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz";
      for (var i=0; i<6; i++) {
        var r = Math.floor(Math.random() * c.length);
        this.queue.scope += c.substring(r,r+1);
      }
    }

    this.buildWrapper();
    Tips.add(this);
    this.activate();
  },

  activate: function() {
    this.eventShow = this.showTip.safeBind(this);
    this.eventHide = this.hideTip.safeBind(this);
	
    this.element.observe('mouseover', this.eventShow);
	this.element.observe('mousedown', this.eventHide);
    this.element.observe('mouseout', this.eventHide);
  },
  
  
  deactivate: function() {
    this.element.stopObserving('mouseover', this.eventShow);
	this.element.stopObserving('mousedown', this.eventHide);
    this.element.stopObserving('mouseout', this.eventHide);
  },



  buildWrapper: function() {
  this.wrapper = document.createElement('div');
    Element.setStyle(this.wrapper, {
      position: 'absolute',
      zIndex: Tips.zIndex+1,
	  width: '139px',
      display: 'none'
    });



    // IE select fix

    if (Prototype.Browser.IE) {
      this.underlay = document.createElement('iframe');
      this.underlay.src = 'javascript:;';
      Element.setStyle(this.underlay, {
        position: 'absolute',
        display: 'none',
        border: 0,
        margin: 0,
        opacity: 0.01,
        padding: 0,
        background: 'none',
        zIndex: Tips.zIndex
      });
    }

  },

  buildTip: function() {
    if(Prototype.Browser.IE) document.body.appendChild(this.underlay); // IE selectbox fix
    // add the tooltip
    this.tooltip = this.wrapper.appendChild(document.createElement('div'));
    this.tooltip.className = this.options.className;
    this.tooltip.style.position = 'relative';

    // add the title

    if (this.options.title) {
      this.title = this.tooltip.appendChild(document.createElement('div'));
      this.title.className = 'title';
      Element.update(this.title, this.options.title);
    }

    // content

    this.tip = this.tooltip.appendChild(document.createElement('div'));
    this.tip.className = 'content';
    Element.update(this.tip, this.content);
	
    // add wrapper to the body

    document.body.appendChild(this.wrapper);
	
    // prepare for effects

    var w = this.wrapper.getDimensions();
    this.wrapper.setStyle({ width: w.width+'px', height: w.height+'px' });
    if (Prototype.Browser.IE) this.underlay.setStyle({  width: w.width+'px', height: w.height+'px' });
    Element.hide(this.tooltip);
  },

  showTip: function(event){
    if (!this.tooltip) this.buildTip();
    this.positionTip(event); // follow mouse
    if (this.wrapper.visible() && this.options.effect != 'appear') return;
    if (Prototype.Browser.IE) this.underlay.show(); // IE select fix
    this.wrapper.show();
    if (!this.options.effect) {
      this.tooltip.show(); 
    } else {

      // stop running effect

	 if (this.activeEffect) Effect.Queues.get(this.queue.scope).remove(this.activeEffect);

      // start new
	  this.activeEffect = Effect[Effect.PAIRS[this.options.effect][0]](this.tooltip, { duration: this.options.duration, queue: this.queue});
	}

  },



  hideTip: function(event){
    if(!this.wrapper.visible()) return;
	if (!this.options.effect) {
      if (Prototype.Browser.IE) { this.underlay.hide(); } // select fix
      this.tooltip.hide();
      this.wrapper.hide();
    }

    else {

      // stop running effect
	  if (this.activeEffect) Effect.Queues.get(this.queue.scope).remove(this.activeEffect);

      // start new
	  this.activeEffect = Effect[Effect.PAIRS[this.options.effect][1]](this.tooltip, { duration: this.options.duration, queue: this.queue, afterFinish: function(){
        if (Prototype.Browser.IE) this.underlay.hide(); // select fix
        this.wrapper.hide();
      }.bind(this)});

    }

  },



  positionTip: function(event){

    // calculate

    var offset = {'left': this.options.offset.x,'top': this.options.offset.y};
    var targetPosition = Position.cumulativeOffset(this.target);
    var tipd = this.wrapper.getDimensions();
    var pos = {
      'left': (this.options.fixed) ? targetPosition[0] : Event.pointerX(event),
      'top': (this.options.fixed) ? targetPosition[1] : Event.pointerY(event)
    }



    // add offsets

    pos.left += offset.left;
    pos.top += offset.top;



    if (this.options.hook) {
      var dims = {'target': this.target.getDimensions(), 'tip': tipd}
      var hooks = {'target': Position.cumulativeOffset(this.target), 'tip': Position.cumulativeOffset(this.target)}
      for(var z in hooks) {
        switch(this.options.hook[z]){
          case 'topRight':

            hooks[z][0] += dims[z].width;

            break;

          case 'bottomLeft':

            hooks[z][1] += dims[z].height;

            break;

          case 'bottomRight':

            hooks[z][0] += dims[z].width;

            hooks[z][1] += dims[z].height;

            break;

        }

      }



      // move based on hooks

      pos.left += -1*(hooks.tip[0] - hooks.target[0]);

      pos.top += -1*(hooks.tip[1] - hooks.target[1]);

    }



    // move tooltip when there is a different target when following mouse

    if (!this.options.fixed && this.element !== this.target) {

      var elementPosition = Position.cumulativeOffset(this.element);

      pos.left += -1*(elementPosition[0] - targetPosition[0]);

      pos.top += -1*(elementPosition[1] - targetPosition[1]);

	}



    if (!this.options.fixed && this.options.viewport) {

      var scroll = this.getScrollOffsets();

      var viewport = this.viewportSize();

      var pair = {'left': 'width', 'top': 'height'};



      for(var z in pair) {

        if ((pos[z] + tipd[pair[z]] - scroll[z]) > viewport[pair[z]]) {

          pos[z] = pos[z] - tipd[pair[z]] - 2*offset[z];

		}

      }

    }



    // position

    this.wrapper.setStyle({

      left: pos.left + 'px',

      top: pos.top + 'px'
    });

    if (Prototype.Browser.IE) this.underlay.setStyle({ left: pos.left+'px', top: pos.top+'px' });

  },



  // Functions below hopefully won't be needed with prototype 1.6

  viewportWidth: function(){

    if (Prototype.Browser.Opera) return document.body.clientWidth;

    return document.documentElement.clientWidth;

  },



  viewportHeight: function(){

    if (Prototype.Browser.Opera) return document.body.clientHeight;

    if (Prototype.Browser.WebKit) return this.innerHeight;

    return document.documentElement.clientHeight;

  },



  viewportSize : function(){

    return {'height': this.viewportHeight(), 'width': this.viewportWidth()};

  },



  getScrollLeft: function(){

	  return this.pageXOffset || document.documentElement.scrollLeft;

  },

  

  getScrollTop: function(){

    return this.pageYOffset || document.documentElement.scrollTop;

  },



  getScrollOffsets: function(){

    return {'left': this.getScrollLeft(), 'top': this.getScrollTop()}

  }

}



/* fix for $A is not defined on Firefox */

Function.prototype.safeBind = function() {

  var __method = this, args = $A(arguments), object = args.shift();

  return function() {

	if (typeof $A == 'function')

    return __method.apply(object, args.concat($A(arguments)));

  }

}