/**
* 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: '40px', width: '50px' });
                        } else {
                            _thumb.css({ width: '50px', height: '40px' });
                        }
                    } 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) } } });