/*
* 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",
        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
        });	
    }	
},

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;	
}

}