/**
 * jquery.LavaLamp - light up your menu with fluid, jQuery powered animations.
 *
 * Requires jQuery v1.2.3 or better from http://jquery.com
 * Tested on jQuery 1.2.6 and 1.3.2
 *
 * http://nixboxdesigns.com/projects/jquery-lavalamp.php
 *
 * Copyright (c) 2008, 2009, 2010 Jolyon Terwilliger, jolyon@nixbox.com
 * Source code Copyright (c) 2007, 2008
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *
 * credits to Guillermo Rauch and Ganeshji Marwaha (gmarwaha.com) for previous editions
 *
 * Version: 1.0 - adapted for jQuery 1.2.x series
 * Version: 1.1 - added linum parameter
 * Version: 1.2 - modified to support vertical resizing of elements
 * Version: 1.3 - enhanced automatic <li> item hi-lighting - will attempt to
 *                  lock onto li > a element with href closest to selected
 *                  window.location
 *              - click always returns 'true' by default, for standard link follow through.
 *
 * Version: 1.3.1 - verified for use with jQuery 1.3 - should still work with 1.2.x series
 *              - changed linum parameter to startItem for clarity
 *              - improved slide-in accuracy for .back elements with borders
 *              - changed .current class to .selected for clarity and improved
 *                  support
 *              - appended 'Lava' to all internal class names to avoid conflicts
 *              - fixed bug applying selected class to elements with matching
 *                  location.hash
 *              - now supports jquery.compat plugin for cross-library support
 *              - performance improvements
 *              - added new options:
 *              autoReturn: true - if set to false, hover will not return to last selected
 *                                  item upon list mouseout.
 *              returnDelay: 0 - if set, will delay auto-return feature specified # of
 *                                  milliseconds.
 *              setOnClick: true - if set to false, hover will return to default element
 *                                  regardless of click event.
 *              homeLeft: 0, homeTop: 0 - if either set to non zero value, absolute
 *                                  positioned li element with class .homeLava is 
 *                                  prepended to list for homing feature.
 *              homeWidth: 0, homeHeight: 0 - if set, are used for creation of li.homeLava
 *                                  element.
 *              returnHome: false - if set along with homeLeft or homeTop, lavalamp hover
 *                                  will always return to li.home after click.
 *
 * Version: 1.3.2 - fixed: stray $ references inside the plugin to work with
 *                  jQuery.noConflict() properly - thanks Colin.
 *
 * Version: 1.3.3 - fixed: added closure with null passed argument for move() command in
 *                  returnDelay to fix errors some were seeing - thanks to Michel and 
 *                  Richard for noticing this.
 *
 *                  fixed: changed mouseover/out events to mouseenter/leave to fix jerky
 *                  animation problem when using excessive margins instead of padding.  
 *                  Thanks to Thomas for the solution and Chris for demonstrating the problem.
 *                  * requires jQuery 1.3 or better
 *
 *                  enhanced: added 'noLava' class detection to prevent LavaLamp effect
 *                  application to LI elements with this class. This feature allows you to
 *                  create submenus - for details, see examples at
 *                  http://nixboxdesigns.com/demos/jquery-lavalamp-demos.html
 *
 *                  enhanced: modified to better automatically find default location for 
 *                  relative links. Thanks to Harold for testing and finding this bug.
 *
 * Version: 1.3.4 - major overhaul on practically everything:
 *                  enhanced: better automatic default item selection and URI resolution,
 *                  better support for returnHome and returnDelay, refined internal variable
 *                  usage and test to be as lean as possible
 *                  fixed: backLava hover element now exactly covers the destination LI dimensions.
 *                  fixed: changed use of mouseleave/mouseenter to bind events so will work with
 *                          jQuery 1.2.2 onward.
 *                  enhanced: behaves more like a plugin should and now automatically adds proper
 *                          position CSS tags to the backLava element and parent container
 *                          if absent. 
 *
 * Examples and usage:
 *
 * The HTML markup used to build the menu can be as simple as...
 *
 *       <ul class="lavaLamp">
 *           <li><a href="#">Phone Home</a></li>
 *           <li><a href="#">Make Contact</a></li>
 *           <li><a href="#">Board Ship</a></li>
 *           <li><a href="#">Fly to Venus</a></li>
 *       </ul>
 *
 * Additional Styles must be added to make the LavaLamp perform properly, to wit:
 *
 * <style>
 * ul.lavaLamp {
 *   padding:5px;  // use some minimal padding to account for sloppy mouse movements
 * }
 * ul.lavaLamp li.backLava {
 *   z-index:3;   // must be less than z-index of A tags within the LI elements
 * }
 * ul.lavaLamp li a {
 *  display:block;  // helps with positioning the link within the LI element
 *  z-index:10;     // or must be higher than li.backLava z-index
 * }
 * </style>
 *
 * Once you have included the basic styles above, you will need to include 
 * the jQuery library, easing plugin (optional) and the this LavaLamp plugin.
 *
 * jQuery Easing Library 1.3 available here:  http://plugins.jquery.com/project/Easing
 * 
 * Example LavaLamp initializing statement:
 * $(function() { $("ul.lavaLamp").lavaLamp({ fx: "easeOutBack", speed: 700}) });
 * finds all UL elements in the document with the class of 'lavaLamp' and attaches the 
 * LavaLamp plugin using an easing library fx of OutBack and an animate speed of 
 * 700 milliseconds or 7/10ths of a second.
 *
 *
 * List of Parameters
 *
 * @param target - default: 'li' 
 * valid selector for target elements to receive hover effect
 *
 * Example:
 * jQuery("div#article").lavaLamp({ target:'p' });
 * assigns all p elements under div#article to receive lavaLamp hover events
 *
 * @param fx - default: 'swing'
 * selects the easing formula for the animation - requires the jQuery Easing library 
 * to be loaded for additional effects
 * 
 * Example:
 * jQuery("ul.lavaLamp").lavaLamp({ fx: "easeOutElastic" });
 * animates the backLava element using the OutElastic formula
 * 
 * @param speed - default: 500
 * sets animation speed in milliseconds
 * 
 * Example:
 * jQuery("ul.lavaLamp").lavaLamp({ speed: 1000 });
 * sets the animation speed to one second.
 * 
 * @param click - default: function() { return true; }
 * Callback to be executed when the menu item is clicked. The 'event' object and source LI
 * DOM element will be passed in as arguments so you can use them in your function.
 * 
 * Example:
 * jQuery("ul.lavaLamp").lavaLamp({ click: function(event, menuItem) {
 *      alert(event+el);
 *      return false;
 * } });
 * causes the browser to display an alert message of the variables passed and 
 * return false aborts any other click events on child items, including not 
 * following any links contained within the LI
 *
 * @param startItem - default: 'no'
 * specifies the number LI element as default, starting with 0 for the first element
 * Used to manually set the default lavaLamp hi-light on load.
 *
 * Example:
 * jQuery("ul.lavaLamp").lavaLamp({ startItem: 2 });
 * selects the third element in the list as default location for backLava
 *
 * @param autoReturn - default: true
 * defines whether the backLava hover should return to the last selected element
 * upon mouseleave.
 *
 * Example:
 * jQuery("ul.lavaLamp").lavaLamp({ autoReturn: false });
 * turns off the autoReturn feature - backLava element will stay on the last element
 * that you hovered over.
 *
 * @param returnDelay - default: 0
 * how many milliseconds to wait before returning the backLava element to the last
 * selected element.  Only works if autoReturn is set to true (default setting)
 *
 * Example:
 * jQuery("ul.lavaLamp").lavaLamp({ returnDelay: 1000 });
 * waits one second after mouseleave event before returning to the last selected
 * element.
 *
 * @param setOnClick - default: true
 * defines whether a clicked element should receive the selectLava class and become the
 * most recently selected element
 *
 * Example:
 * jQuery("ul.lavaLamp").lavaLamp({ setOnClick:false });
 * disables selecting of elements once clicked - after you leave the parent list element
 * the backLava will return to the original default element the page was loaded with.
 *
 * @param homeTop - default: 0
 * @param homeLeft - default: 0
 * @param homeHeight - default: 0
 * @param homeWidth - default: 0
 * allows you to define an independent 'home' element where the backLava defaults to or can
 * be sent to. This can be used to define a unique starting and/or resting place for the 
 * backLava upon leaving the parent element.
 *
 * Example:
 * jQuery("ul.lavaLamp").lavaLamp({ homeTop:-100, homeLeft:0, homeHeight:20, homeWidth:600 });
 * creates a home element 100 pixels above the parent container with a height of 20px and
 * width of 600px.  If the parent element has CSS of overflow:hidden, this can provide
 * an interesting fly-in effect
 *
 * @param returnHome - default:false
 * adjusts behavior of the backLava element when the the mouse leaves the parent container. 
 * the default behavior of 'false' causes the backLava element to stay on the active menu 
 * items after it is first triggered. this feature respects the returnDelay parameter, if set.
 * this feature overrides the autoReturn parameter.
 *
 * Example:
 * jQuery("ul.lavaLamp").lavaLamp({ returnHome:true });
 * causes the backLava element to always return to the homeLava position after 
 * mouse leaves the parent container.  this can be manually triggered by running 
 * the command jQuery("ul.lavaLamp").mouseover();
 *
 *
 */

//console.log();
(function(jQuery) {
jQuery.fn.lavaLamp = function(o) {
    o = jQuery.extend({
                target: 'li', 
                fx: 'swing',
                speed: 500, 
                click: function(){return true}, 
                startItem: '',
                autoReturn: true,
                returnDelay: 0,
                setOnClick: true,
                homeTop:0,
                homeLeft:0,
                homeWidth:0,
                homeHeight:0,
                returnHome:false
                }, 
            o || {});

    return this.each(function() {
        // ensures parent UL or OL element has some positioning
        if (jQuery(this).css('position')=='static')
            jQuery(this).css('position','relative');

        // create homeLava element if origin dimensions set
        if (o.homeTop || o.homeLeft) { 
            var $home = jQuery('<'+o.target+' class="homeLava"></'+o.target+'>').css({ left:o.homeLeft, top:o.homeTop, width:o.homeWidth, height:o.homeHeight, position:'absolute' });
            jQuery(this).prepend($home);
        }

        var path = location.pathname + location.search + location.hash, $selected, $back, $lt = jQuery(o.target+'[class!=noLava]', this), delayTimer, bx=by=0;

        // start $selected default with CSS class 'selected'
        $selected = jQuery(o.target+'.selected', this);
        
        // override $selected if startItem is set
        if (o.startItem != '')
            $selected = $lt.eq(o.startItem);

        // default to $home element
        if ((o.homeTop || o.homeLeft) && $selected.length<1)
            $selected = $home;

        // loop through all the target element a href tags and
        // the longest href to match the location path is deemed the most 
        // accurate and selected as default
        if ($selected.length<1) {
            var pathmatch_len=0, $pathel;
    
            $lt.each(function(){ 
                var thishref = $('a:first',this).attr('href');
                //console.log(thishref+' size:'+thishref.length);
                if (path.indexOf(thishref)>-1 && thishref.length > pathmatch_len )
                {
                    $pathel = $(this);
                    pathmatch_len = thishref.length;
                }
    
            });
            if (pathmatch_len>0) {
                //console.log('found match:'+$('a:first',$pathel).attr('href'));
                $selected = $pathel;
            }
            //else 
                //console.log('no match!');
        }
    
        // if still no matches, default to the first element
        if ( $selected.length<1 )
            $selected = $lt.eq(0);

        // make sure we only have one element as $selected and apply selected class
        $selected = jQuery($selected.eq(0).addClass('selected'));
            
        // add mouseover event for every sub element
        $lt.bind('mouseenter', function() {
            //console.log('mouseenter');
            // help backLava behave if returnDelay is set
            if(delayTimer) {clearTimeout(delayTimer);delayTimer=null;}
            move(jQuery(this));
        }).click(function(e) {
            if (o.setOnClick) {
                $selected.removeClass('selected');
                $selected = jQuery(this).addClass('selected');
            }
            return o.click.apply(this, [e, this]);
        });
        
        // creates and adds to the container a backLava element with absolute positioning
        $back = jQuery('<li class="backLava"><div class="leftLava"></div><div class="bottomLava"></div><div class="cornerLava"></div></li>').css('position','absolute').prependTo(this);

        // compute border and padding differences on styled backLava element
        bx = parseInt($back.css('borderLeftWidth').match(/\d+/))+parseInt($back.css('borderRightWidth').match(/\d+/))+parseInt($back.css('paddingLeft').match(/\d+/))+parseInt($back.css('paddingRight').match(/\d+/));
        by = parseInt($back.css('borderTopWidth').match(/\d+/))+parseInt($back.css('borderBottomWidth').match(/\d+/))+parseInt($back.css('paddingTop').match(/\d+/))+parseInt($back.css('paddingBottom').match(/\d+/));
        //console.log("bx="+bx+", by="+by);

        // set the starting position for the lavalamp hover element: .back
        if (o.homeTop || o.homeLeft)
            $back.css({ left:o.homeLeft, top:o.homeTop, width:o.homeWidth, height:o.homeHeight });
        else
        {
            $back.css({ left: $selected.position().left, top: $selected.position().top, width: $selected.outerWidth()-bx, height: $selected.outerHeight()-by });
        }
        
        // after we leave the container element, move back to default/last clicked element
        jQuery(this).bind('mouseleave', function() {
            //console.log('mouseleave');
            var $returnEl = null;
            if (o.returnHome)
                $returnEl = $home;
            else if (!o.autoReturn)
                return true;
        
            if (o.returnDelay) {
                if(delayTimer) clearTimeout(delayTimer);
                delayTimer = setTimeout(function(){move($returnEl);},o.returnDelay);
            }
            else {
                move($returnEl);
            }
            return true;
        });

        function move($el) {
            if (!$el) { $el = $selected; $selected.addClass('selected'); } else { $selected.removeClass('selected'); }

            $back.stop()
            .animate({
                left: $el.position().left,
                top: $el.position().top,
                width: $el.outerWidth()-bx,
                height: $el.outerHeight()-by
            }, o.speed, o.fx);
        };
    });
};
})(jQuery);