/*
 * 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;
        }
        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;
        /*
        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 + "px",

            //top: this.options.delta_y + "px",
            //top: y - (this.options.delta_y - offset) + "px",
            left: x + this.options.delta_x - 25 + "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.userAgent.indexOf('MSIE') > 0) {
            innerHeight = document.body.clientHeight;
        } else {
            innerHeight = window.innerHeight;
        }
        return innerHeight;
    },

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

}