/**
* Galleria (http://monc.se/kitchen)
*
* Galleria is a javascript image gallery written in jQuery.
* It loads the images one by one from an unordered list and displays thumbnails when each image is loaded.
* It will create thumbnails for you if you choose so, scaled or unscaled,
* centered and cropped inside a fixed thumbnail box defined by CSS.
*
* The core of Galleria lies in it's smart preloading behaviour, snappiness and the fresh absence
* of obtrusive design elements. Use it as a foundation for your custom styled image gallery.
*
* MAJOR CHANGES v.FROM 0.9
* Galleria now features a useful history extension, enabling back button and bookmarking for each image.
* The main image is no longer stored inside each list item, instead it is placed inside a container
* onImage and onThumb functions lets you customize the behaviours of the images on the site
*
* Tested in Safari 3, Firefox 2, MSIE 6, MSIE 7, Opera 9
*
* Version 1.0
* Februari 21, 2008
*
* Copyright (c) 2008 David Hellsing (http://monc.se)
* Licensed under the GPL licenses.
* http://www.gnu.org/licenses/gpl.txt
**/

;(function($){

var $$;


/**
*
* @desc Convert images from a simple html <ul> into a thumbnail gallery
* @author David Hellsing
* @version 1.0
*
* @name Galleria
* @type jQuery
*
* @cat plugins/Media
*
* @example $('ul.gallery').galleria({options});
* @desc Create a a gallery from an unordered list of images with thumbnails
* @options
*   insert:   (selector string) by default, Galleria will create a container div before your ul that holds the image.
*             You can, however, specify a selector where the image will be placed instead (f.ex '#main_img')
*   history:  Boolean for setting the history object in action with enabled back button, bookmarking etc.
*   onImage:  (function) a function that gets fired when the image is displayed and brings the jQuery image object.
*             You can use it to add click functionality and effects.
*             f.ex onImage(image) { image.css('display','none').fadeIn(); } will fadeIn each image that is displayed
*   onThumb:  (function) a function that gets fired when the thumbnail is displayed and brings the jQuery thumb object.
*             Works the same as onImage except it targets the thumbnail after it's loaded.
*
**/

$$ = $.fn.galleria = function($options) {
       
       // check for basic CSS support
       if (!$$.hasCSS()) { return false; }
       
       // init the modified history object
       $.historyInit($$.onPageLoad);
       
       // set default options
       var $defaults = {
               insert      : '.galleria_container',
               history     : true,
               clickNext   : true,
               onImage     : function(image,caption,thumb) {},
               onThumb     : function(thumb) {}
       };
       

       // extend the options
       var $opts = $.extend($defaults, $options);
       
       // bring the options to the galleria object
       for (var i in $opts) {
               $.galleria[i]  = $opts[i];
       }
       
       // if no insert selector, create a new division and insert it before the ul
       var _insert = ( $($opts.insert).is($opts.insert) ) ?
               $($opts.insert) :
               jQuery(document.createElement('div')).insertBefore(this);
               
       // create a wrapping div for the image
       var _div = $(document.createElement('div')).addClass('galleria_wrapper');
       
       // create a caption span
       var _span = $(document.createElement('span')).addClass('caption');
       
       // inject the wrapper in in the insert selector
       _insert.addClass('galleria_container').append(_div).append(_span);
       
       //-------------
       
       return this.each(function(){
               
               // add the Galleria class
               $(this).addClass('galleria');
               
               // loop through list
               $(this).children('li').each(function(i) {
                       
                       // bring the scope
                       var _container = $(this);
                                       
                       // build element specific options
                       var _o = $.meta ? $.extend({}, $opts, _container.data()) : $opts;
                       
                       // remove the clickNext if image is only child
                       _o.clickNext = $(this).is(':only-child') ? false : _o.clickNext;
                       $.galleria.clickNext = _o.clickNext;
                       
                       // try to fetch an anchor
                       var _a = $(this).find('a').is('a') ? $(this).find('a') : false;
                       
                       // reference the original image as a variable and hide it
                       var _img = $(this).children('img').css('display','none');
                       
                       // extract the original source
                       var _src = _a ? _a.attr('href') : _img.attr('src');
                       
                       // find a title
                       var _title = _a ? _a.attr('title') : _img.attr('title');
                       
                       // create loader image            
                       var _loader = new Image();
                       
                       // check url and activate container if match
                       if (_o.history && (window.location.hash && window.location.hash.replace(/\#/,'') == _src)) {
                               _container.siblings('.active').removeClass('active');
                               _container.addClass('active');
                       }
               
                       // begin loader
                       $(_loader).load(function () {
                               
                               // try to bring the alt
                               $(this).attr('alt',_img.attr('alt'));
                               
                               //-----------------------------------------------------------------
                               // the image is loaded, let's create the thumbnail
                               
                               var _thumb = _a ?
                                       _a.find('img').addClass('thumb noscale').css('display','none') :
                                       _img.clone(true).addClass('thumb').css('display','none');
                               
                               if (_a) { _a.replaceWith(_thumb); }
                               
                               if (!_thumb.hasClass('noscale')) { // scaled tumbnails!
                                       var w = Math.ceil( _img.width() / _img.height() * _container.height() );
                                       var h = Math.ceil( _img.height() / _img.width() * _container.width() );
                                       if (w < h) {
                                               _thumb.css({ height: 'auto', width: _container.width(), marginTop: -(h-_container.height())/2 });
                                       } else {
                                               _thumb.css({ width: 'auto', height: _container.height(), marginLeft: -(w-_container.width())/2 });
                                       }
                               } else { // Center thumbnails.
                                       // a tiny timer fixed the width/height
                                       window.setTimeout(function() {
                                               _thumb.css({
                                                       marginLeft: -( _thumb.width() - _container.width() )/2,
                                                       marginTop:  -( _thumb.height() - _container.height() )/2
                                               });
                                       }, 1);
                               }
                               
                               // add the rel attribute
                               _thumb.attr('rel',_src);
                               
                               // add the title attribute
                               _thumb.attr('title',_title);
                               
                               // add the click functionality to the _thumb
                               _thumb.click(function() {
                                       $.galleria.activate(_src);
                               });
                               
                               // hover classes for IE6
                               _thumb.hover(
                                       function() { $(this).addClass('hover'); },
                                       function() { $(this).removeClass('hover'); }
                               );
                               _container.hover(
                                       function() { _container.addClass('hover'); },
                                       function() { _container.removeClass('hover'); }
                               );

                               // prepend the thumbnail in the container
                               _container.prepend(_thumb);
                               
                               // show the thumbnail
                               _thumb.css('display','block');
                               
                               // call the onThumb function
                               _o.onThumb(jQuery(_thumb));
                               
                               // check active class and activate image if match
                               if (_container.hasClass('active')) {
                                       $.galleria.activate(_src);
                                       //_span.text(_title);
                               }
                               
                               //-----------------------------------------------------------------
                               
                               // finally delete the original image
                               _img.remove();
                               
                       }).error(function () {
                               
                               // Error handling
                           _container.html('<span class="error" style="color:red">Error loading image: '+_src+'</span>');
                       
                       }).attr('src', _src);
               });
       });
};


/**
*
* @name NextSelector
*
* @desc Returns the sibling sibling, or the first one
*
**/

$$.nextSelector = function(selector) {
       return $(selector).is(':last-child') ?
                  $(selector).siblings(':first-child') :
          $(selector).next();
         
};

/**
*
* @name previousSelector
*
* @desc Returns the previous sibling, or the last one
*
**/

$$.previousSelector = function(selector) {
       return $(selector).is(':first-child') ?
                  $(selector).siblings(':last-child') :
          $(selector).prev();
         
};

/**
*
* @name hasCSS
*
* @desc Checks for CSS support and returns a boolean value
*
**/

$$.hasCSS = function()  {
       $('body').append(
               $(document.createElement('div')).attr('id','css_test')
               .css({ width:'1px', height:'1px', display:'none' })
       );
       var _v = ($('#css_test').width() != 1) ? false : true;
       $('#css_test').remove();
       return _v;
};

/**
*
* @name onPageLoad
*
* @desc The function that displays the image and alters the active classes
*
* Note: This function gets called when:
* 1. after calling $.historyInit();
* 2. after calling $.historyLoad();
* 3. after pushing "Go Back" button of a browser
*
**/

$$.onPageLoad = function(_src) {        
       
       // get the wrapper
       var _wrapper = $('.galleria_wrapper');
       
       // get the thumb
       var _thumb = $('.galleria img[@rel="'+_src+'"]');
       
       if (_src) {
               
               // new hash location
               if ($.galleria.history) {
                       window.location = window.location.href.replace(/\#.*/,'') + '#' + _src;
               }
               
               // alter the active classes
               _thumb.parents('li').siblings('.active').removeClass('active');
               _thumb.parents('li').addClass('active');
       
               // define a new image
               var _img   = $(new Image()).attr('src',_src).addClass('replaced');

               // empty the wrapper and insert the new image
               _wrapper.empty().append(_img);

               // insert the caption
               _wrapper.siblings('.caption').text(_thumb.attr('title'));
               
               // fire the onImage function to customize the loaded image's features
               $.galleria.onImage(_img,_wrapper.siblings('.caption'),_thumb);
               
               // add clickable image helper
               if($.galleria.clickNext) {
                       _img.css('cursor','pointer').click(function() { $.galleria.next(); })
               }
               //center image
		var _replaced = $('.replaced');
		var _container = $('.galleria_container');
		_replaced.css({
			marginLeft: -( _replaced.width() - _container.width() )/2,
			marginTop: -( _replaced.height() - _container.height() )/2
		});
       } 
       
       
       
       
       
       
       else {
               
               // clean up the container if none are active
               _wrapper.siblings().andSelf().empty();
               
               // remove active classes
               $('.galleria li.active').removeClass('active');
       }

       // place the source in the galleria.current variable
       $.galleria.current = _src;
       
}

/**
*
* @name jQuery.galleria
*
* @desc The global galleria object holds four constant variables and four public methods:
*       $.galleria.history = a boolean for setting the history object in action with named URLs
*       $.galleria.current = is the current source that's being viewed.
*       $.galleria.clickNext = boolean helper for adding a clickable image that leads to the next one in line
*       $.galleria.next() = displays the next image in line, returns to first image after the last.
*       $.galleria.prev() = displays the previous image in line, returns to last image after the first.
*       $.galleria.activate(_src) = displays an image from _src in the galleria container.
*       $.galleria.onImage(image,caption) = gets fired when the image is displayed.
*
**/

$.extend({galleria : {
       current : '',
       onImage : function(){},
       activate : function(_src) {
               if ($.galleria.history) {
                       $.historyLoad(_src);
               } else {
                       $$.onPageLoad(_src);
               }
       },
       next : function() {
               var _next = $($$.nextSelector($('.galleria img[@rel="'+$.galleria.current+'"]').parents('li'))).find('img').attr('rel');
               $.galleria.activate(_next);
       },
       prev : function() {
               var _prev = $($$.previousSelector($('.galleria img[@rel="'+$.galleria.current+'"]').parents('li'))).find('img').attr('rel');
               $.galleria.activate(_prev);
       }
}
});

})(jQuery);


/**
*
* Packed history extension for jQuery
* Credits to http://www.mikage.to/
*
**/


jQuery.extend({historyCurrentHash:undefined,historyCallback:undefined,historyInit:function(callback){jQuery.historyCallback=callback;var current_hash=location.hash;jQuery.historyCurrentHash=current_hash;if(jQuery.browser.msie){if(jQuery.historyCurrentHash==''){jQuery.historyCurrentHash='#'}$("body").prepend('<iframe id="jQuery_history" style="display: none;"></iframe>');var ihistory=$("#jQuery_history")[0];var iframe=ihistory.contentWindow.document;iframe.open();iframe.close();iframe.location.hash=current_hash}else if($.browser.safari){jQuery.historyBackStack=[];jQuery.historyBackStack.length=history.length;jQuery.historyForwardStack=[];jQuery.isFirst=true}jQuery.historyCallback(current_hash.replace(/^#/,''));setInterval(jQuery.historyCheck,100)},historyAddHistory:function(hash){jQuery.historyBackStack.push(hash);jQuery.historyForwardStack.length=0;this.isFirst=true},historyCheck:function(){if(jQuery.browser.msie){var ihistory=$("#jQuery_history")[0];var iframe=ihistory.contentDocument||ihistory.contentWindow.document;var current_hash=iframe.location.hash;if(current_hash!=jQuery.historyCurrentHash){location.hash=current_hash;jQuery.historyCurrentHash=current_hash;jQuery.historyCallback(current_hash.replace(/^#/,''))}}else if($.browser.safari){if(!jQuery.dontCheck){var historyDelta=history.length-jQuery.historyBackStack.length;if(historyDelta){jQuery.isFirst=false;if(historyDelta<0){for(var i=0;i<Math.abs(historyDelta);i++)jQuery.historyForwardStack.unshift(jQuery.historyBackStack.pop())}else{for(var i=0;i<historyDelta;i++)jQuery.historyBackStack.push(jQuery.historyForwardStack.shift())}var cachedHash=jQuery.historyBackStack[jQuery.historyBackStack.length-1];if(cachedHash!=undefined){jQuery.historyCurrentHash=location.hash;jQuery.historyCallback(cachedHash)}}else if(jQuery.historyBackStack[jQuery.historyBackStack.length-1]==undefined&&!jQuery.isFirst){if(document.URL.indexOf('#')>=0){jQuery.historyCallback(document.URL.split('#')[1])}else{var current_hash=location.hash;jQuery.historyCallback('')}jQuery.isFirst=true}}}else{var current_hash=location.hash;if(current_hash!=jQuery.historyCurrentHash){jQuery.historyCurrentHash=current_hash;jQuery.historyCallback(current_hash.replace(/^#/,''))}}},historyLoad:function(hash){var newhash;if(jQuery.browser.safari){newhash=hash}else{newhash='#'+hash;location.hash=newhash}jQuery.historyCurrentHash=newhash;if(jQuery.browser.msie){var ihistory=$("#jQuery_history")[0];var iframe=ihistory.contentWindow.document;iframe.open();iframe.close();iframe.location.hash=newhash;jQuery.historyCallback(hash)}else if(jQuery.browser.safari){jQuery.dontCheck=true;this.historyAddHistory(hash);var fn=function(){jQuery.dontCheck=false};window.setTimeout(fn,200);jQuery.historyCallback(hash);location.hash=newhash}else{jQuery.historyCallback(hash)}}});