/**
 * 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');

		if (_src) {

			// get the thumb
			var _thumb = $('.galleria img[rel="' + _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 {
				$$.onPageLoad(_src);
			}
		},
		next: function() {
			if ($.galleria.current == "") {
				var _next = $($$.nextSelector($('.galleria img').parents('li'))).find('img').attr('rel');
				$.galleria.activate(_next);
			}
			else {
				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)}}});