/*
 * 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 Tooltip = Class.create();
Tooltip.prototype = {
  initialize: function(element, tool_tip, p_url) {
    var options = Object.extend({
      default_css: false,
      margin: "0px",
	    padding: "5px",
	    backgroundColor: "#d6d6fc",
	    delta_x: 5,
	    delta_y: 5,
      zindex: 9000
    }, arguments[1] || {});

    this.element      = $(element);
    this.tool_tip     = $(tool_tip);
    this.url          = p_url;
    this.options      = options;

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

    this.eventMouseMove = this.showTooltip.bindAsEventListener(this);
    this.eventMouseOut  = this.hideTooltip.bindAsEventListener(this);
    if(this.url!=null){
      this.eventClick     = this.clickTooltip.bindAsEventListener(this);
    }

    this.registerEvents();
  },

  destroy: function() {
    Event.stopObserving(this.element, "mousemove", this.eventMouseMove);
    Event.stopObserving(this.element, "mouseout", this.eventMouseOut);
    if(this.url!=null){
      Event.stopObserving(this.element, "click", this.eventClick);
    }
  },

  registerEvents: function() {
    Event.observe(this.element, "mousemove", this.eventMouseMove);
    Event.observe(this.element, "mouseout", this.eventMouseOut);
    if(this.url!=null){
      Event.observe(this.element, "click", this.eventClick);
    }
  },

  clickTooltip: function(event){
    //alert(this.url);
    window.location.href=this.url;
  },

  showTooltip: 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.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 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 + "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 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;
  }

}