/*
 * 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-0.2.js - Small tooltip library on top of Prototype 
 * by Jonathan Weiss <jw@innerewut.de> distributed under the BSD license. 
 *
 * This tooltip library works in two modes. If it gets a valid DOM element 
 * or DOM id as an argument it uses this element as the tooltip. This 
 * element will be placed (and shown) near the mouse pointer when a trigger-
 * element is moused-over.
 * If it gets only a text as an argument instead of a DOM id or DOM element
 * it will create a div with the classname 'tooltip' that holds the given text.
 * This newly created div will be used as the tooltip. This is usefull if you 
 * want to use tooltip.js to create popups out of title attributes.
 * 
 *
 * Usage: 
 *   <script src="/javascripts/prototype.js" type="text/javascript"></script>
 *   <script src="/javascripts/tooltip.js" type="text/javascript"></script>
 *   <script type="text/javascript">
 *     // with valid DOM id
 *     var my_tooltip = new Tooltip('id_of_trigger_element', 'id_of_tooltip_to_show_element')
 *
 *     // with text
 *     var my_other_tooltip = new Tooltip('id_of_trigger_element', 'a nice description')
 *
 *     // create popups for each element with a title attribute
 *    Event.observe(window,"load",function() {
 *      $$("*").findAll(function(node){
 *        return node.getAttribute('title');
 *      }).each(function(node){
 *        new Tooltip(node,node.title);
 *        node.removeAttribute("title");
 *      });
 *    });
 *    
 *   </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 Tooltip = Class.create();
Tooltip.prototype = 
{
	initialize: function(element, tool_tip) 
	{
		var options = Object.extend(
		{
			default_css: false,
			margin: "0px",
			padding: "5px",
			backgroundColor: "#d6d6fc",
			min_distance_x: 5,
			min_distance_y: 5,
			delta_x: 0,
			delta_y: 0,
			zindex: 1000
		}, arguments[2] || {});

		this.element = $(element);
		this.options = options;
    
		// use the supplied tooltip element or create our own div
		if($(tool_tip)) 
		{
			this.tool_tip = $(tool_tip);
		} 
		else 
		{
			this.tool_tip = $(document.createElement("div")); 
			document.body.appendChild(this.tool_tip);
			this.tool_tip.addClassName("tooltip");
			this.tool_tip.appendChild(document.createTextNode(tool_tip));
		}

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

		this.eventMouseOver = this.showTooltip.bindAsEventListener(this);
		this.eventMouseOut = this.hideTooltip.bindAsEventListener(this);
		this.eventMouseMove = this.moveTooltip.bindAsEventListener(this);

		this.registerEvents();
	},

	destroy: function() 
	{
		Event.stopObserving(this.element, "mouseover", this.eventMouseOver);
		Event.stopObserving(this.element, "mouseout", this.eventMouseOut);
		Event.stopObserving(this.element, "mousemove", this.eventMouseMove);
	},

	registerEvents: function() 
	{
		Event.observe(this.element, "mouseover", this.eventMouseOver);
		Event.observe(this.element, "mouseout", this.eventMouseOut);
		Event.observe(this.element, "mousemove", this.eventMouseMove);
	},

	moveTooltip: function(event)
	{
		Event.stop(event);
		// get Mouse position
		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.min_distance_x) ) // too big for X
		{
			mouse_x = mouse_x - element_width;
			// apply min_distance to make sure that the mouse is not on the tool-tip
			mouse_x = mouse_x - this.options.min_distance_x;
		} 
		else 
		{
			mouse_x = mouse_x + this.options.min_distance_x;
		}

		if ( (element_height + mouse_y) >= ( this.getWindowHeight() - this.options.min_distance_y) ) // too big for Y
		{
			mouse_y = mouse_y - element_height;
			// apply min_distance to make sure that the mouse is not on the tool-tip
			mouse_y = mouse_y - this.options.min_distance_y;
		} 
		else 
		{
			mouse_y = mouse_y + this.options.min_distance_y;
		} 

		// now set the right styles
		this.setStyles(mouse_x, mouse_y);
	},
	
	showTooltip: function(event) 
	{
		Event.stop(event);
		this.moveTooltip(event);
		new Element.show(this.tool_tip);
	},

	setStyles: function(x, y)
	{
		// set the right styles to position the tool tip
		Element.setStyle(this.tool_tip, 
		{
			position:'absolute',
			top:y + this.options.delta_y + "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 Element.hide(this.tool_tip);
	},

	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;	
	}
}