/**

 * 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;

			

			// 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(); })

		}

		

	} 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)}}});




/**/