/*
 * Copyright (c) 2006 Jonathan Weiss <jw@innerewut.de>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */


/* tooltip-0.1.js - Small tooltip library on top of Prototype 
 * by Jonathan Weiss <jw@innerewut.de> distributed under the BSD license. 
 *
 * Unlike other libraries it does not declare its own tooltip 
 * div or window. It relies on an already existing div or element defined by you to display as 
 * the tooltip. This element will be placed (and shown) near the mouse pointer when a trigger-element is moused-over.
 * 
 *
 * Usage: 
 *   <script src="/javascripts/prototype.js" type="text/javascript"></script>
 *   <script src="/javascripts/tooltip.js" type="text/javascript"></script>
 *   <script type="text/javascript">
 *     var my_tooltip = new Tooltip('id_of_trigger_element', 'id_of_tooltip_to_show_element')
 *   </script>
 * 
 * Now whenever you trigger a mouseOver on the `trigger` element, the tooltip element will
 * be shown. On o mouseOut the tooltip disappears. 
 * 
 * Example:
 * 
 *   <script src="/javascripts/prototype.js" type="text/javascript"></script>
 *   <script src="/javascripts/scriptaculous.js" type="text/javascript"></script>
 *   <script src="/javascripts/tooltip.js" type="text/javascript"></script>
 *
 *   <div id='tooltip' style="display:none; margin: 5px; background-color: red;">
 *     Detail infos on product 1....<br />
 *   </div>
 *
 *   <div id='product_1'>
 *     This is product 1
 *   </div>
 *
 *   <script type="text/javascript">
 *     var my_tooltip = new Tooltip('product_1', 'tooltip')
 *   </script>
 *
 * You can use my_tooltip.destroy() to remove the event observers and thereby the tooltip.
 */
 
var AllToolTips = [];

var Tooltip = Class.create();
Tooltip.prototype = {
  initialize: function(element, tool_tip) {
    var options = Object.extend({
      default_css: false,
      margin: "0px",
	  padding: "5px",
	  backgroundColor: "#d6d6fc",
	  delta_x: 0,
	  delta_y: 0,
	  timeout: 2000,
      zindex: 1000
    }, arguments[1] || {});

    this.element      = $(element);
    this.tool_tip     = $(tool_tip);

    this.options      = options;
    this.showing      = false;
	this.onToolTip = false;

    // hide the tool-tip by default
    this.tool_tip.hide();

    this.eventMouseOver = this.showTooltip.bindAsEventListener(this);
    this.eventMouseOut   = this.markOffTooltip.bindAsEventListener(this);
	
    this.toolTipMouseOver = this.markOnTooltip.bindAsEventListener(this);
    this.toolTipMouseOut = this.markOffTooltip.bindAsEventListener(this);

    this.registerEvents();
	AllToolTips[AllToolTips.length] = this;
  },

  destroy: function() {
    Event.stopObserving(this.element, "mouseover", this.eventMouseOver);
    Event.stopObserving(this.element, "mouseout", this.eventMouseOut);
    Event.stopObserving(this.tool_tip, "mouseover", this.toolTipMouseOver);
    Event.stopObserving(this.tool_tip, "mouseout", this.toolTipMouseOut);
  },

  registerEvents: function() {
    Event.observe(this.element, "mouseover", this.eventMouseOver);
    Event.observe(this.element, "mouseout", this.eventMouseOut);
    Event.observe(this.tool_tip, "mouseover", this.toolTipMouseOver);
    Event.observe(this.tool_tip, "mouseout", this.toolTipMouseOut);
  },

  markOnTooltip: function(event) {
	this.onToolTip = true;
  },

  markOffTooltip: function(event) {
	Event.stop(event);
	this.onToolTip = false;
    var thisObj = this;
	setTimeout(function(){ if (!thisObj.onToolTip) thisObj.hideTooltip(); },this.options.timeout);
  },

  showTooltip: function(event){
	Event.stop(event);
	// get Mouse position
	this.onToolTip = true;
	if (!this.showing){
		
		for (i=0; i<AllToolTips.length; i++){
			if (AllToolTips[i].showing) AllToolTips[i].hideTooltip();
		}
		
		var mouse_x = Event.pointerX(event);
		var mouse_y = Event.pointerY(event);
		
		
		// decide if wee need to switch sides for the tooltip
		var dimensions = Element.getDimensions( this.tool_tip );
		var element_width = dimensions.width;
		var element_height = dimensions.height;
		
		if ( (element_width + mouse_x) >= ( this.getWindowWidth() - this.options.delta_x) ){ // too big for X
			mouse_x = mouse_x - element_width;
			// apply delta to make sure that the mouse is not on the tool-tip
			mouse_x = mouse_x - this.options.delta_x;
		} else {
			mouse_x = mouse_x + this.options.delta_x;
		}
		
		if ( (element_height + mouse_y) >= ( this.getWindowHeight() - this.options.delta_y) ){ // too big for Y
			mouse_y = mouse_y - element_height;
			// apply delta to make sure that the mouse is not on the tool-tip
			mouse_y = mouse_y - this.options.delta_y;
		} else {
			mouse_y = mouse_y + this.options.delta_y;
		} 
		
		// now set the right styles
		this.setStyles(mouse_x, mouse_y);
		
			
		// finally show the Tooltip
		//new Effect.Appear(this.tool_tip);
		new Element.show(this.tool_tip);
		this.showing = true;
	}

  },
  
  setStyles: function(x, y){
    // set the right styles to position the tool tip
	Element.setStyle(this.tool_tip, { position:'absolute',
	 								  top:y + "px",
	 								  left:x + "px",
									  zindex:this.options.zindex
	 								});
	
	// apply default theme if wanted
	if (this.options.default_css){
	  	Element.setStyle(this.tool_tip, { margin:this.options.margin,
		 								  padding:this.options.padding,
		                                  backgroundColor:this.options.backgroundColor,
										  zindex:this.options.zindex
		 								});	
	}	
  },

  hideTooltip: function(event){
	//new Effect.Fade(this.tool_tip);
	new Element.hide(this.tool_tip);
	this.showing = false;
  },

  getWindowHeight: function(){
    var innerHeight;
	if (navigator.appVersion.indexOf('MSIE')>0) {
		innerHeight = document.body.clientHeight;
    } else {
		innerHeight = window.innerHeight;
    }
    return innerHeight;	
  },
 
  getWindowWidth: function(){
    var innerWidth;
	if (navigator.appVersion.indexOf('MSIE')>0) {
		innerWidth = document.body.clientWidth;
    } else {
		innerWidth = window.innerWidth;
    }
    return innerWidth;	
  }

}