/**
 * 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',
            imgSize: 500,
            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)}}});