/**
 * 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) {
			if (i) {
				$.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+'"]');

		//Changed per http://devkick.com/talk/topic/382/jquery-13/
		var _thumb;

		if (_src) {

			_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 {
				$$.onPageLoad(_src);
			}
		},
		/*
		next : function() {
		var _next = $($$.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);
		}
	
	Changed per http://devkick.com/talk/topic/382/jquery-13/
		*/
		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);


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


/*
 * jQuery history plugin
 *
 * Copyright (c) 2006 Taku Sano (Mikage Sawatari)
 * Licensed under the MIT License:
 * http://www.opensource.org/licenses/mit-license.php
 *
 * Modified by Lincoln Cooper to add Safari support and only call the callback once during initialization
 * for msie when no initial hash supplied.
 */


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) {
			// To stop the callback firing twice during initilization if no hash present
			if (jQuery.historyCurrentHash === '') {
			jQuery.historyCurrentHash = '#';
		}
		
			// add hidden iframe for IE
			$("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) {
			// etablish back/forward stacks
			jQuery.historyBackStack = [];
			jQuery.historyBackStack.length = history.length;
			jQuery.historyForwardStack = [];
			
			jQuery.isFirst = true;
		}
		jQuery.historyCallback(current_hash.replace(/^#/, ''));
		setInterval(jQuery.historyCheck, 100);
	},
	
	historyAddHistory: function(hash) {
		// This makes the looping function do something
		jQuery.historyBackStack.push(hash);
		
		jQuery.historyForwardStack.length = 0; // clear forwardStack (true click occured)
		this.isFirst = true;
	},
	
	historyCheck: function(){
		if(jQuery.browser.msie) {
			// On IE, check for location.hash of iframe
			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) { // back or forward button has been pushed
					jQuery.isFirst = false;
					var i;
					if (historyDelta < 0) { // back button has been pushed
						// move items to forward stack
						for (i = 0; i < Math.abs(historyDelta); i++) {
							jQuery.historyForwardStack.unshift(jQuery.historyBackStack.pop());
						}
					} else { // forward button has been pushed
						// move items to back stack
						for (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) {
					// back button has been pushed to beginning and URL already pointed to hash (e.g. a bookmark)
					// document.URL doesn't change in Safari
					if (document.URL.indexOf('#') >= 0) {
						jQuery.historyCallback(document.URL.split('#')[1]);
					} else {
						current_hash = location.hash;
						jQuery.historyCallback('');
					}
					jQuery.isFirst = true;
				}
			}
		} else {
			// otherwise, check for location.hash
			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;
			// Manually keep track of the history values for Safari
			this.historyAddHistory(hash);
			
			// Wait a while before allowing checking so that Safari has time to update the "history" object
			// correctly (otherwise the check loop would detect a false change in hash).
			var fn = function() {jQuery.dontCheck = false;};
			window.setTimeout(fn, 200);
			jQuery.historyCallback(hash);
			// N.B. "location.hash=" must be the last line of code for Safari as execution stops afterwards.
			//      By explicitly using the "location.hash" command (instead of using a variable set to "location.hash") the
			//      URL in the browser and the "history" object are both updated correctly.
			location.hash = newhash;
		}
		else {
		  jQuery.historyCallback(hash);
		}
	}
});