// 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('mousemove', this.eventShow);
 this.element.observe('mouseout', this.eventHide);
 },

 deactivate: function() {
 this.element.stopObserving('mousemove', this.eventShow);
 this.element.stopObserving('mouseout', this.eventHide);
 },

 buildWrapper: function() {
 this.wrapper = document.createElement('div');
 Element.setStyle(this.wrapper, {
 position: 'absolute',
 zIndex: Tips.zIndex+1,
 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)));
 }
}