/**
 * An adapter for Shadowbox and the MooTools JavaScript framework.
 *
 * This file is part of Shadowbox.
 *
 * Shadowbox is an online media viewer application that supports all of the
 * web's most popular media publishing formats. Shadowbox is written entirely
 * in JavaScript and CSS and is highly customizable. Using Shadowbox, website
 * authors can showcase a wide assortment of media in all major browsers without
 * navigating users away from the linking page.
 *
 * Shadowbox is released under version 3.0 of the Creative Commons Attribution-
 * Noncommercial-Share Alike license. This means that it is absolutely free
 * for personal, noncommercial use provided that you 1) make attribution to the
 * author and 2) release any derivative work under the same or a similar
 * license.
 *
 * If you wish to use Shadowbox for commercial purposes, licensing information
 * can be found at http://mjijackson.com/shadowbox/.
 *
 * @author      Michael J. I. Jackson <mjijackson@gmail.com>
 * @copyright   2007-2008 Michael J. I. Jackson
 * @license     http://creativecommons.org/licenses/by-nc-sa/3.0/
 * @version     SVN: $Id: shadowbox-mootools.js 110 2008-07-11 04:42:10Z mjijackson $
 */

if(typeof MooTools == 'undefined'){
    // Note: requires MooTools 1.2 Core
    throw 'Unable to load Shadowbox, MooTools library not found';
}

// create the Shadowbox object first
var Shadowbox = {};

Shadowbox.lib = function(){

    var alphaRe = /alpha\([^\)]*\)/gi;

    /**
     * Sets the opacity of the given element to the specified level. Necessary
     * in the MooTools adapter to prevent MooTools from messing with the
     * element's visibility.
     *
     * @param   {HTMLElement}   el          The element
     * @param   {Number}        opacity     The opacity to use
     * @return  void
     * @private
     * @static
     */
    var setOpacity = function(el, opacity){
        var s = el.style;
        if(window.ActiveXObject){ // IE
            s.zoom = 1;
            s.filter = (s.filter || '').replace(alphaRe, '') +
                       (opacity == 1 ? '' : ' alpha(opacity=' + opacity * 100 + ')');
        }else{
            s.opacity = opacity;
        }
    };

    return {

        adapter: 'mootools',

        /**
         * Gets the value of the style on the given element.
         *
         * @param   {HTMLElement}   el      The DOM element
         * @param   {String}        style   The name of the style (e.g. margin-top)
         * @return  {mixed}                 The value of the given style
         * @public
         * @static
         */
        getStyle: function(el, style){
            return $(el).getStyle(style);
        },

        /**
         * Sets the style on the given element to the given value. May be an
         * object to specify multiple values.
         *
         * @param   {HTMLElement}   el      The DOM element
         * @param   {String/Object} style   The name of the style to set if a
         *                                  string, or an object of name =>
         *                                  value pairs
         * @param   {String}        value   The value to set the given style to
         * @return  void
         * @public
         * @static
         */
        setStyle: function(el, style, value){
            el = $(el);
            if(typeof style != 'object'){
                var o = {};
                o[style] = value;
                style = o;
            }
            for(var s in style){
                if(s == 'opacity'){
                    setOpacity(el, style[s]);
                }else{
                    el.setStyle(s, style[s]);
                }
            }
        },

        /**
         * Gets a reference to the given element.
         *
         * @param   {String/HTMLElement}    el      The element to fetch
         * @return  {HTMLElement}                   A reference to the element
         * @public
         * @static
         */
        get: function(el){
            return $(el);
        },

        /**
         * Removes an element from the DOM.
         *
         * @param   {HTMLElement}           el      The element to remove
         * @return  void
         * @public
         * @static
         */
        remove: function(el){
            el.parentNode.removeChild(el);
        },

        /**
         * Gets the target of the given event. The event object passed will be
         * the same object that is passed to listeners registered with
         * addEvent().
         *
         * @param   {mixed}         e       The event object
         * @return  {HTMLElement}           The event's target element
         * @public
         * @static
         */
        getTarget: function(e){
            return e.target;
        },

        /**
         * Gets the page X/Y coordinates of the mouse event in an [x, y] array.
         * The page coordinates should be relative to the document, and not the
         * viewport. The event object provided here will be the same object that
         * is passed to listeners registered with addEvent().
         *
         * @param   {mixed}         e       The event object
         * @return  {Array}                 The page X/Y coordinates
         * @public
         * @static
         */
        getPageXY: function(e){
            return [e.page.x, e.page.y];
        },

        /**
         * Prevents the event's default behavior. The event object passed will
         * be the same object that is passed to listeners registered with
         * addEvent().
         *
         * @param   {mixed}         e       The event object
         * @return  void
         * @public
         * @static
         */
        preventDefault: function(e){
            e.preventDefault();
        },

        /**
         * Gets the key code of the given event object (keydown). The event
         * object here will be the same object that is passed to listeners
         * registered with addEvent().
         *
         * @param   {mixed}         e       The event object
         * @return  {Number}                The key code of the event
         * @public
         * @static
         */
        keyCode: function(e){
            return e.code;
        },

        /**
         * Adds an event listener to the given element. It is expected that this
         * function will be passed the event as its first argument.
         *
         * @param   {HTMLElement}   el          The DOM element to listen to
         * @param   {String}        name        The name of the event to register
         *                                      (i.e. 'click', 'scroll', etc.)
         * @param   {Function}      handler     The event handler function
         * @return  void
         * @public
         * @static
         */
        addEvent: function(el, name, handler){
            $(el).addEvent(name, handler);
        },

        /**
         * Removes an event listener from the given element.
         *
         * @param   {HTMLElement}   el          The DOM element to stop listening to
         * @param   {String}        name        The name of the event to stop
         *                                      listening for (i.e. 'click')
         * @param   {Function}      handler     The event handler function
         * @return  void
         * @public
         * @static
         */
        removeEvent: function(el, name, handler){
            $(el).removeEvent(name, handler);
        },

        /**
         * Appends an HTML fragment to the given element.
         *
         * @param   {HTMLElement}       el      The element to append to
         * @param   {String}            html    The HTML fragment to use
         * @return  void
         * @public
         * @static
         */
        append: function(el, html){
            if(el.insertAdjacentHTML){
                el.insertAdjacentHTML('BeforeEnd', html);
            }else if(el.lastChild){
                var range = el.ownerDocument.createRange();
                range.setStartAfter(el.lastChild);
                var frag = range.createContextualFragment(html);
                el.appendChild(frag);
            }else{
                el.innerHTML = html;
            }
        }

    };

}();