/**
 * 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');
 // ERIC: removed the addClass
 var _span = $(document.createElement('span'));
 
 // 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);


/**
 *
 * 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);
			  }
			  }
			  });