/**
 * 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.hide();
				
			}).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 IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!! IMPORTANT PART!!!!
		_wrapper.siblings('.caption').html("<span class=\"CAPTION-ProjectTitle\">"+_thumb.attr('ProjectTitle') + "</span><br><span class=\"CAPTION-Organization\">" + _thumb.attr('Organization') + "</span><p class=\"CAPTION-Objective\">" + _thumb.attr('Objective') + 
	 //UNCOMMENT THIS PART TO ADD THE COMPONENTS LINE BACK IN"</p><p class=\"CAPTION-Components\">" + _thumb.attr('Components') + 
		"</p><div class=\"CAPTION-LinkVisibleText\"><a href=" + "\"" + _thumb.attr('LinkAddress') + "\" target=\"blank\">" +_thumb.attr('LinkVisibleText') +"</a></div>");
		


		
		// 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)}}});