/*
 * 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({
			movable: false,
			timeout: false,
			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);

		if ( this.options.movable )
		{
			this.eventMouseMove = this.moveTooltip.bindAsEventListener(this);
		}

		this.registerEvents();
	},

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

		if ( this.options.movable )
		{
			Event.stopObserving(this.element, "mousemove", this.eventMouseMove);
		}
		else
		{
			Event.stopObserving(this.tool_tip, "mouseover", this.eventMouseOver);
			Event.stopObserving(this.tool_tip, "mouseout", this.eventMouseOut);
		}
	},

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

		if ( this.options.movable )
		{
			Event.observe(this.element, "mousemove", this.eventMouseMove);
		}
		else
		{
			Event.observe(this.tool_tip, "mouseover", this.eventMouseOver);
			Event.observe(this.tool_tip, "mouseout", this.eventMouseOut);
		}
	},

	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) )
		if ( (element_width + event.clientX) >= ( 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) )
		if ( (element_height + event.clientY) >= ( 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);

		this.hideSelectElements(mouse_x, mouse_y, element_width, element_height);
	},

	showTooltip: function(event) {
		if ( this.options.timeout && this.timeout_id )
		{
			clearTimeout(this.timeout_id);
		}

		if ( !this.tool_tip.visible() )
		{
			Event.stop(event);
			this.moveTooltip(event);
			new Element.show(this.tool_tip);

//			this.hideSelectElements();
		}
	},

	hideTooltip: function(event) {
		if ( this.options.movable )
		{
			new Element.hide(this.tool_tip);
		}
		else
		{
			if ( !this.options.timeout )
			{
				this._hideTooltip();
			}
			else
			{
				this.timeout_id = setTimeout(this._hideTooltip.bind(this), 100);
				this.showSelectElements();
			}
		}
	},

	_hideTooltip: function(event) {
		new Element.hide(this.tool_tip);
		this.showSelectElements();
	},

	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",
			left:x + this.options.delta_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
			});
		}
	},

	showSelectElements: function() {
		var oSelectList = document.getElementsByTagName('SELECT');

		if ( oSelectList.length )
		{
			for ( var i = 0; i < oSelectList.length; i++ )
			{
				oSelectList[i].style.display = '';
			}
		}
	},

	hideSelectElements: function(l, t, w, h) {
		var oSelectList = document.getElementsByTagName('SELECT');

		if ( oSelectList.length )
		{
			for ( var i = 0; i < oSelectList.length; i++ )
			{
				var dimensions = Element.getDimensions(oSelectList[i]);

				var sw = dimensions.width;
				var sh = dimensions.height;

				var positions = Element.positionedOffset(oSelectList[i]);

				var sl = positions.left;
				var st = positions.top;

				if ( ( sl >= l && st >= t && sl <= (l+w) && st <= (t+h) ) || ( (sl+sw) >= l && (st+sh) >= t && (sl+sw) <= (l+w) && (st+sh) <= (t+h) ) )
				{
					oSelectList[i].style.display = 'none';
				}
			}
		}
	},

	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;
	}
}