/**
 * jQuery Lightbox
 * Version 0.5 - 11/29/2007
 * @author Warren Krewenki
 *
 * Changes by:
 * @author Krzysztof Kotowicz <koto at webworkers dot pl>:
 *  - bugfix: multiple instances of Lightbox galleries allowed
 *    (using opts variable instead of $.fn.lightbox.defaults)
 *  - bugfix: use var for local variables in a few functions
 *  - added support for navbarOnTop setting
 *  - added support for displayTitle setting
 *  - added support for slideNavBar setting (with slideNavBarSpeed)
 *  - added support for displayHelp setting
 *  - added support for fitToScreen setting (ported Lightbox VinDSL hack)
 *    (see http://www.huddletogether.com/forum/comments.php?DiscussionID=307)
 *  - plugin now uses jQuery.width() and jQuery.height()
 *  - removed eval() calls
 *  - removed destroyElement - uses jQuery.remove()
 *  - use of prevLinkText, nextLinkText and help
 *  - all strings are now placed in opts.strings to allow for customization/translation
 *
 * Based on Lightbox 2 by Lokesh Dhakar (http://www.huddletogether.com/projects/lightbox2/)
 * Originally written to make use of the Prototype framework, and Script.acalo.us, now altered to use jQuery.
 *
 **/
(function($){
    var opts;
    $.fn.lightbox = function(options){
        // build main options
        opts = $.extend({}, $.fn.lightbox.defaults, options);
        // initalize the lightbox
        $.fn.lightbox.initialize();
        return this.each(function(){
            $(this).click(function(){
                $(this).lightbox.start(this);
                return false;
            });
        });
    };
    // lightbox functions
    $.fn.lightbox.initialize = function(){
        $('#overlay').remove();
        $('#lightbox').remove();
        opts.inprogress = false;
        var outerImage = '<div id="outerImageContainer"><div id="imageContainer"><img id="lightboxImage"><div id="hoverNav"><a href="javascript://" title="' + opts.strings.prevLinkTitle + '" id="prevLink"></a><a href="javascript://" id="nextLink" title="' + opts.strings.nextLinkTitle + '"></a></div><div id="loading"><a href="javascript://" id="loadingLink"><img src="'+opts.fileLoadingImage+'"></a></div></div></div>';
        var imageData = '<div id="imageDataContainer" class="clearfix"><div id="imageData"><div id="imageDetails"><span id="caption"></span><span id="numberDisplay"></span></div><div id="bottomNav">'
        if (opts.displayHelp)
            imageData += '<span id="helpDisplay">' + opts.strings.help + '</span>';
        imageData += '<a href="javascript://" id="bottomNavClose" title="' + opts.strings.closeTitle + '"><img src="'+opts.fileBottomNavCloseImage+'"></a></div></div></div>';
        var string;
        if (opts.navbarOnTop) {
          string = '<div id="overlay"></div><div id="lightbox">' + imageData + outerImage + '</div>';
          $("body").append(string);
          $("#imageDataContainer").addClass('ontop');
        } else {
          string = '<div id="overlay"></div><div id="lightbox">' + outerImage + imageData + '</div>';
          $("body").append(string);
        }
        $("#overlay").click(function(){ $.fn.lightbox.end(); }).hide();
        $("#lightbox").click(function(){ $.fn.lightbox.end();}).hide();
        $("#loadingLink").click(function(){ $.fn.lightbox.end(); return false;});
        $("#bottomNavClose").click(function(){ $.fn.lightbox.end(); return false; });
        $('#outerImageContainer').width(opts.widthCurrent).height(opts.heightCurrent);
        $('#imageDataContainer').width(opts.widthCurrent);
    };
    $.fn.lightbox.getPageSize = function(){
        var xScroll, yScroll;
        if (window.innerHeight && window.scrollMaxY) {
            xScroll = window.innerWidth + window.scrollMaxX;
            yScroll = window.innerHeight + window.scrollMaxY;
        } else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
            xScroll = document.body.scrollWidth;
            yScroll = document.body.scrollHeight;
        } else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
            xScroll = document.body.offsetWidth;
            yScroll = document.body.offsetHeight;
        }
        var windowWidth, windowHeight;
        if (self.innerHeight) { // all except Explorer
            if(document.documentElement.clientWidth){
                windowWidth = document.documentElement.clientWidth;
            } else {
                windowWidth = self.innerWidth;
            }
            windowHeight = self.innerHeight;
        } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
            windowWidth = document.documentElement.clientWidth;
            windowHeight = document.documentElement.clientHeight;
        } else if (document.body) { // other Explorers
            windowWidth = document.body.clientWidth;
            windowHeight = document.body.clientHeight;
        }
        // for small pages with total height less then height of the viewport
        if(yScroll < windowHeight){
            pageHeight = windowHeight;
        } else {
            pageHeight = yScroll;
        }

        // for small pages with total width less then width of the viewport
        if(xScroll < windowWidth){
            pageWidth = xScroll;
        } else {
            pageWidth = windowWidth;
        }
        var arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight);
        return arrayPageSize;
    };

    $.fn.lightbox.getPageScroll = function(){
        var xScroll, yScroll;
        if (self.pageYOffset) {
            yScroll = self.pageYOffset;
            xScroll = self.pageXOffset;
        } else if (document.documentElement && document.documentElement.scrollTop){  // Explorer 6 Strict
            yScroll = document.documentElement.scrollTop;
            xScroll = document.documentElement.scrollLeft;
        } else if (document.body) {// all other Explorers
            yScroll = document.body.scrollTop;
            xScroll = document.body.scrollLeft;
        }
        var arrayPageScroll = new Array(xScroll,yScroll);
        return arrayPageScroll;
    };
    $.fn.lightbox.pause = function(ms){
        var date = new Date();
        var curDate = null;
        do{curDate = new Date();}
        while( curDate - date < ms);
    };
    $.fn.lightbox.start = function(imageLink){
        $("select, embed, object").hide();
        var arrayPageSize = $.fn.lightbox.getPageSize();
        $("#overlay").hide().css({width: '100%', height: arrayPageSize[1]+'px', opacity : opts.overlayOpacity}).fadeIn();
        opts.imageArray = [];
        imageNum = 0;
        var anchors = document.getElementsByTagName( imageLink.tagName);
        // if image is NOT part of a set..
        if(!imageLink.rel || (imageLink.rel == '')){
            // add single image to Lightbox.imageArray
            opts.imageArray.push(new Array(imageLink.href, opts.displayTitle ? imageLink.title : ''));
        } else {
        // if image is part of a set..
            $("a").each(function(){
                if(this.href && (this.rel == imageLink.rel)){
                    opts.imageArray.push(new Array(this.href, opts.displayTitle ? this.title : ''));
                }
            })

            for(i = 0; i < opts.imageArray.length; i++){
                for(j = opts.imageArray.length-1; j>i; j--){
                    if(opts.imageArray[i][0] == opts.imageArray[j][0]){
                        opts.imageArray.splice(j,1);
                    }
                }
            }
            while(opts.imageArray[imageNum][0] != imageLink.href) { imageNum++;}
        }
        // calculate top and left offset for the lightbox
        var arrayPageScroll = $.fn.lightbox.getPageScroll();
        var lightboxTop = arrayPageScroll[1] + (arrayPageSize[3] / 10);
        var lightboxLeft = arrayPageScroll[0];
        $('#lightbox').css({top: lightboxTop+'px', left: lightboxLeft+'px'}).show();

        if (!opts.slideNavBar)
            $('#imageData').hide();
        $.fn.lightbox.changeImage(imageNum);
    };
    $.fn.lightbox.changeImage = function(imageNum){
        if(opts.inprogress == false){
            opts.inprogress = true;
            opts.activeImage = imageNum;    // update global var
            // hide elements during transition
            $('#loading').show();
            $('#lightboxImage').hide();
            $('#hoverNav').hide();
            $('#prevLink').hide();
            $('#nextLink').hide();
            if (opts.slideNavBar) { // delay preloading image until navbar will slide up
                // $('#imageDataContainer').slideUp(opts.navBarSlideSpeed, $.fn.doChangeImage);
                $('#imageDataContainer').hide();
                $('#imageData').hide();
                $.fn.doChangeImage();
            } else {
                $.fn.doChangeImage();
            }
        }
    };
    $.fn.doChangeImage = function(){
        imgPreloader = new Image();
        // once image is preloaded, resize image container
        imgPreloader.onload=function(){
            var newWidth = imgPreloader.width;
            var newHeight = imgPreloader.height;

            if (opts.fitToScreen) {
                var arrayPageSize = $.fn.lightbox.getPageSize();
                var ratio;
                var initialPageWidth = arrayPageSize[2] - 2 * opts.borderSize;
                var initialPageHeight = arrayPageSize[3] - 200;
                if (imgPreloader.height > initialPageHeight)
                {
                    newWidth = parseInt((initialPageHeight/imgPreloader.height) * imgPreloader.width);
                    newHeight = initialPageHeight;
                }
                else if (imgPreloader.width > initialPageWidth)
                {
                    newHeight = parseInt((initialPageWidth/imgPreloader.width) * imgPreloader.height);
                    newWidth = initialPageWidth;
                }
            }
            $('#lightboxImage').attr('src', opts.imageArray[opts.activeImage][0])
                               .width(newWidth).height(newHeight);
            $.fn.lightbox.resizeImageContainer(newWidth, newHeight);
        }
        imgPreloader.src = opts.imageArray[opts.activeImage][0];
    }
    
    $.fn.lightbox.end = function(){
        $.fn.lightbox.disableKeyboardNav();
        $('#lightbox').hide();
        $('#overlay').fadeOut();
        $('select, object, embed').show();
    };
    $.fn.lightbox.preloadNeighborImages = function(){
        if((opts.imageArray.length - 1) > opts.activeImage){
            preloadNextImage = new Image();
            preloadNextImage.src = opts.imageArray[opts.activeImage + 1][0];
        }
        if(opts.activeImage > 0){
            preloadPrevImage = new Image();
            preloadPrevImage.src = opts.imageArray[opts.activeImage - 1][0];
        }
    };
    $.fn.lightbox.keyboardAction = function(e){
        if (e == null) { // ie
            var keycode = event.keyCode;
            var escapeKey = 27;
        } else { // mozilla
            var keycode = e.keyCode;
            var escapeKey = e.DOM_VK_ESCAPE;
        }
        var key = String.fromCharCode(keycode).toLowerCase();
        if((key == 'x') || (key == 'o') || (key == 'c') || (keycode == escapeKey)){ // close lightbox
            $.fn.lightbox.end();
        } else if((key == 'p') || (keycode == 37)){ // display previous image
            if(opts.activeImage != 0){
                $.fn.lightbox.disableKeyboardNav();
                $.fn.lightbox.changeImage(opts.activeImage - 1);
            }
        } else if((key == 'n') || (keycode == 39)){ // display next image
            if(opts.activeImage != (opts.imageArray.length - 1)){
                $.fn.lightbox.disableKeyboardNav();
                $.fn.lightbox.changeImage(opts.activeImage + 1);
            }
        }
    };
    $.fn.lightbox.resizeImageContainer = function(imgWidth, imgHeight){
        // get current width and height
        opts.widthCurrent = document.getElementById('outerImageContainer').offsetWidth;
        opts.heightCurrent = document.getElementById('outerImageContainer').offsetHeight;
        // get new width and height
        var widthNew = (imgWidth  + (opts.borderSize * 2));
        var heightNew = (imgHeight  + (opts.borderSize * 2));
        // scalars based on change from old to new
        opts.xScale = ( widthNew / opts.widthCurrent) * 100;
        opts.yScale = ( heightNew / opts.heightCurrent) * 100;
        // calculate size difference between new and old image, and resize if necessary
        wDiff = opts.widthCurrent - widthNew;
        hDiff = opts.heightCurrent - heightNew;
        $('#imageDataContainer').animate({width: widthNew},opts.resizeSpeed,'linear');
        $('#outerImageContainer').animate({width: widthNew},opts.resizeSpeed,'linear',function(){
            $('#outerImageContainer').animate({height: heightNew},opts.resizeSpeed,'linear',function(){
                $.fn.lightbox.showImage();
            });
        });

        // if new and old image are same size and no scaling transition is necessary,
        // do a quick pause to prevent image flicker.
        if((hDiff == 0) && (wDiff == 0)){
            if (jQuery.browser.msie){ $.fn.lightbox.pause(250); } else { $.fn.lightbox.pause(100);}
        }
        $('#prevLink').height(imgHeight);
        $('#nextLink').height(imgHeight);
    };
    $.fn.lightbox.showImage = function(){
        $('#loading').hide();
        $('#lightboxImage').fadeIn("fast");
        $.fn.lightbox.updateDetails();
        $.fn.lightbox.preloadNeighborImages();
        opts.inprogress = false;
    };
    $.fn.lightbox.updateDetails = function(){
        if(opts.imageArray[opts.activeImage][1]){
            $('#caption').html(opts.imageArray[opts.activeImage][1]).show();
        }
        // if image is part of set display 'Image x of x'
        if(opts.imageArray.length > 1){
            var nav_html;
            nav_html = opts.strings.image + (opts.activeImage + 1) + opts.strings.of + opts.imageArray.length;
            // display previous / next text links
            if ((opts.activeImage) > 0) {
                nav_html = '<a title="' + opts.strings.prevLinkTitle + '" href="#" id="prevLinkText">' + opts.strings.prevLinkText + "</a>" + nav_html;
            }
            if ((opts.activeImage + 1) < opts.imageArray.length) {
                nav_html += '<a title="' + opts.strings.nextLinkTitle + '" href="#" id="nextLinkText">' + opts.strings.nextLinkText + "</a>";
            }
            $('#numberDisplay').html(nav_html).show();
        }
        if (opts.slideNavBar) {
            $("#imageData").slideDown(opts.navBarSlideSpeed);
        } else {
            $("#imageData").show();
        }
        var arrayPageSize = $.fn.lightbox.getPageSize();
        $('#overlay').height(arrayPageSize[1]);
        $.fn.lightbox.updateNav();
    };
    $.fn.lightbox.updateNav = function(){
        $('#hoverNav').show();
        // if not first image in set, display prev image button
        if(opts.activeImage != 0){
            $('#prevLink,#prevLinkText').show().click(function(){
                $.fn.lightbox.changeImage(opts.activeImage - 1); return false;
            });
        }
        // if not last image in set, display next image button
        if(opts.activeImage != (opts.imageArray.length - 1)){
            $('#nextLink,#nextLinkText').show().click(function(){
                $.fn.lightbox.changeImage(opts.activeImage +1); return false;
            });
        }
        $.fn.lightbox.enableKeyboardNav();
    };

    $.fn.lightbox.enableKeyboardNav = function(){
        document.onkeydown = $.fn.lightbox.keyboardAction;
    };
    $.fn.lightbox.disableKeyboardNav = function(){
        document.onkeydown = '';
    };
    $.fn.lightbox.defaults = {
        fileLoadingImage : '/images/layout/loading.gif',
        fileBottomNavCloseImage : '/images/layout/closelabel2.gif',
        overlayOpacity : 0.8,
        borderSize : 10,
        imageArray : new Array,
        activeImage : null,
        inprogress : false,
        resizeSpeed : 350,
        widthCurrent: 250,
        heightCurrent: 250,
        xScale : 1,
        yScale : 1,
        displayTitle: true,
        navbarOnTop: false,
        slideNavBar: false, // slide nav bar up/down between image resizing transitions
        navBarSlideSpeed: 350,
        displayHelp: false,
        strings : {
            help: ' \u2190 / P - previous image\u00a0\u00a0\u00a0\u00a0\u2192 / N - next image\u00a0\u00a0\u00a0\u00a0ESC / X - close image gallery',
            prevLinkTitle: 'Vorheriges Bild',
            nextLinkTitle: 'N&auml;chstes Bild',
            prevLinkText:  '&laquo; Zur&uuml;ck',
            nextLinkText:  'Weiter &raquo;',
            closeTitle: 'Schlie&szlig;en',
            image: 'Bild ',
            of: ' von '
        },
        fitToScreen: false        // resize images if they are bigger than window
    };
})(jQuery);