/**
 * jQuery Lightbox
 * @author Warren Krewenki
 *
 * This package is distributed under the BSD license.
 * For full license information, see LICENSE.TXT
 *
 * Based on Lightbox 2 by Lokesh Dhakar (http://www.huddletogether.com/projects/lightbox2/)
 *
 *
 **/

(function($) {
        $.fn.lightbox = function(options) {
                // build main options
                var opts = $.extend({}, $.fn.lightbox.defaults, options);

                $(window).resize(resizeOverlayToFitWindow);

                return $(this).live("click",function(){
                        // initialize the lightbox
                        initialize();
                        showLightbox(this);
                        return false;
                });

                /*
                # Initialize the lightbox by creating our html and reading some image data
                # This method is called by the constructor after any click events trigger it
                # You will never call it by itself, to my knowledge.
                */
                function initialize() {
                        $('#overlay, #lightbox').remove();
                        opts.inprogress = false;

                        // if jsonData, build the imageArray from data provided in JSON format
                        if (opts.jsonData && opts.jsonData.length > 0) {
                                var parser = opts.jsonDataParser ? opts.jsonDataParser : $.fn.lightbox.parseJsonData;
                                opts.imageArray = [];
                                opts.imageArray = parser(opts.jsonData);
                        }

                        var outerImage = '<div id="outerImageContainer"><div id="imageContainer"><iframe id="lightboxIframe"></iframe><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, #lightbox").click(function(){ end(); }).hide();
                        $("#loadingLink, #bottomNavClose").click(function(){ end(); return false;});
                        $('#outerImageContainer').width(opts.widthCurrent).height(opts.heightCurrent);
                        $('#imageDataContainer').width(opts.widthCurrent);

                        if (!opts.imageClickClose) {
                                $("#lightboxImage").click(function(){ return false; });
                                $("#hoverNav").click(function(){ return false; });
                        }

                        return true;
                };

                /*
                # Get the document and window width/heigh
                #
                # Examples
                #
                #        getPageSize()
                #        # => [1024,768,1024,768]
                #
                # Returns a numerically indexed array of document width/height and window width/height
                */
                function getPageSize() {
                        var jqueryPageSize = new Array($(document).width(),$(document).height(), $(window).width(), $(window).height());
                        return jqueryPageSize;
                };

                function getPageScroll() {
                        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;
                };

                /*
                # Pause execution for a length of time
                #
                # ms - Number of milliseconds to pause execution
                #
                # Examples
                #
                #        pause(500)
                #        # => true
                # This runs an ugly loop until the execution time has passed
                # It is a horrible, horrible method and I wish to dispense with it, maybe via timeouts or something.
                # Really, this thing is nasty.  I think it had a really bad childhood or something.  I mean, it is
                # incredibly cruel to your browser, and to my self esteem. I didn't want to write it. I didn't want to include
                # it in my library, what with it's sexy overlay and whatnot, but here it is 4 years later and this thing lives on.
                # Please don't upset it, i've been told it will eat your dreams.
                */
                function pause(ms) {
                        var date = new Date();
                        var curDate = null;
                        do{curDate = new Date();}
                        while(curDate - date < ms);
                };


                /*
                # Deploy the sexy overlay and display the lightbox
                #
                # imageObject - the jQuery object passed via the click event in the constructor
                #
                # Examples
                #
                #        showLightbox($('#CheesusCrust'))
                #
                # Returns a boolean true, because it's got nothing else to return. It should give visual feedback when run
                */
                function showLightbox(imageObject) {
                        /**
                        * select, embed and object tags render over the lightbox in some browsers
                        * Right now, the best way to fix it is to hide them, but that can trigger reloading of some flash content
                        * I don't have a better fix for this right now, but I want ot leave this comment here so you and I both
                        * know that i'm aware of it, and I would love to fix it, if you have any suggestions.
                        **/
                        $("select, embed, object").hide();

                        // Resize and display the sexy, sexy overlay.
                        resizeOverlayToFitWindow();
                        $("#overlay").hide().css({ opacity : opts.overlayOpacity }).fadeIn(1000);
                        imageNum = 0;

                        // if data is not provided by jsonData parameter
                        if (!opts.jsonData) {
                                opts.imageArray = [];
                                // if image is NOT part of a set..
                                if ((!imageObject.rel || (imageObject.rel == '')) && !opts.allSet) {
                                        // add single image to Lightbox.imageArray
                                        opts.imageArray.push(new Array(imageObject.href, opts.displayTitle ? imageObject.title : ''));
                                } else {
                                        // if image is part of a set..
                                        $("a").each(function() {
                                                if(this.href && (this.rel == imageObject.rel)) {
                                                        opts.imageArray.push(new Array(this.href, opts.displayTitle ? this.title : ''));
                                                }
                                        });
                                }
                        }

                        if (opts.imageArray.length > 1) {
                                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] != imageObject.href) {
                                        imageNum++;
                                }
                        }

                        // calculate top and left offset for the lightbox
                        var arrayPageScroll = getPageScroll();
                        var lightboxTop = arrayPageScroll[1] + ($(window).height() / 10);
                        var lightboxLeft = arrayPageScroll[0];
                        $('#lightbox').css({top: lightboxTop+'px', left: lightboxLeft+'px'}).show();

                        if (!opts.slideNavBar) {
                                $('#imageData').hide();
                        }

                        changeImage(imageNum);
                };

                function changeImage(imageNum) {
                        if (opts.inprogress == false) {
                                opts.inprogress = true;

                                // update global var
                                opts.activeImage = imageNum;

                                // hide elements during transition
                                $('#loading').show();
                                $('#lightboxImage, #hoverNav, #prevLink, #nextLink').hide();

                                // delay preloading image until navbar will slide up
                                if (opts.slideNavBar) {
                                        $('#imageDataContainer').hide();
                                        $('#imageData').hide();
                                }
                                doChangeImage();
                        }
                };

                function doChangeImage() {
                        imgPreloader = new Image();

                        // once image is preloaded, resize image container
                        imgPreloader.onload = function() {
                                var newWidth = imgPreloader.width;
                                var newHeight = imgPreloader.height;

                                if (opts.scaleImages) {
                                        newWidth = parseInt(opts.xScale * newWidth);
                                        newHeight = parseInt(opts.yScale * newHeight);
                                }

                                if (opts.fitToScreen) {
                                        var arrayPageSize = getPageSize();
                                        var ratio;
                                        var initialPageWidth = arrayPageSize[2] - 2 * opts.borderSize;
                                        var initialPageHeight = arrayPageSize[3] - 200;

                                        var dI = initialPageWidth/initialPageHeight;
                                        var dP = imgPreloader.width/imgPreloader.height;

                                        if ((imgPreloader.height > initialPageHeight) || (imgPreloader.width > initialPageWidth)) {
                                                if (dI > dP) {
                                                        newWidth = parseInt((initialPageHeight/imgPreloader.height) * imgPreloader.width);
                                                        newHeight = initialPageHeight;
                                                } else {
                                                        newHeight = parseInt((initialPageWidth/imgPreloader.width) * imgPreloader.height);
                                                        newWidth = initialPageWidth;
                                                }
                                        }
                                }

                                $('#lightboxImage').
                                        attr('src', opts.imageArray[opts.activeImage][0]).
                                        width(newWidth).
                                        height(newHeight);

                                        resizeImageContainer(newWidth, newHeight);
                                };

                                imgPreloader.src = opts.imageArray[opts.activeImage][0];
                        };

                        function end() {
                                disableKeyboardNav();
                                $('#lightbox').hide();
                                $('#overlay').fadeOut(1000);
                                $('select, object, embed').show();
                        };

                        function preloadNeighborImages() {
                                if (opts.loopImages && opts.imageArray.length > 1) {
                                        preloadNextImage = new Image();
                                        preloadNextImage.src = opts.imageArray[(opts.activeImage == (opts.imageArray.length - 1)) ? 0 : opts.activeImage + 1][0];

                                        preloadPrevImage = new Image();
                                        preloadPrevImage.src = opts.imageArray[(opts.activeImage == 0) ? (opts.imageArray.length - 1) : opts.activeImage - 1][0];
                                } else {
                                        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];
                                        }
                                }
                        };

                        function resizeImageContainer(imgWidth, imgHeight) {
                                // get current width and height
                                opts.widthCurrent = $("#outerImageContainer").outerWidth();
                                opts.heightCurrent = $("#outerImageContainer").outerHeight();

                                // get new width and height
                                var widthNew = Math.max(350, imgWidth  + (opts.borderSize * 2));
                                var heightNew = (imgHeight  + (opts.borderSize * 2));

                                // 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() {
                                                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) {
                                                pause(250);
                                        } else {
                                                pause(100);
                                        }
                                }

                                $('#prevLink').height(imgHeight);
                                $('#nextLink').height(imgHeight);
                        };

                        function showImage() {
                                $('#loading').hide();
                                $('#lightboxImage').fadeIn(1000);
                                updateDetails();
                                preloadNeighborImages();

                                opts.inprogress = false;
                        };

                        function updateDetails() {
                                $('#numberDisplay').html('');

                                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;

                                        if (opts.displayDownloadLink) {
                                                nav_html += "<a href='" + opts.imageArray[opts.activeImage][0] + "'>" + opts.strings.download + "</a>";
                                        }

                                        if (!opts.disableNavbarLinks) {
                                                // display previous / next text links
                                                if ((opts.activeImage) > 0 || opts.loopImages) {
                                                        nav_html = '<a title="' + opts.strings.prevLinkTitle + '" href="#" id="prevLinkText">' + opts.strings.prevLinkText + "</a>" + nav_html;
                                                }

                                                if (((opts.activeImage + 1) < opts.imageArray.length) || opts.loopImages) {
                                                        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();
                                }

                                resizeOverlayToFitWindow();
                                updateNav();
                        };

                        /*
                        # Resize the sexy overlay to fit the constraints of your current viewing environment
                        #
                        # This should now happen whenever a window is resized, so you should always see a full overlay
                        */
                        function resizeOverlayToFitWindow(){
                                $('#overlay').css({width: $(document).width(), height: $(document).height()});
                                //  ^^^^^^^ <- sexy!
                        };

                        function updateNav() {
                                if (opts.imageArray.length > 1) {
                                        $('#hoverNav').show();

                                        // if loopImages is true, always show next and prev image buttons
                                        if(opts.loopImages) {
                                                $('#prevLink,#prevLinkText').show().click(function() {
                                                        changeImage((opts.activeImage == 0) ? (opts.imageArray.length - 1) : opts.activeImage - 1);
                                                        return false;
                                                });

                                                $('#nextLink,#nextLinkText').show().click(function() {
                                                        changeImage((opts.activeImage == (opts.imageArray.length - 1)) ? 0 : opts.activeImage + 1);
                                                        return false;
                                                });

                                        } else {
                                                // if not first image in set, display prev image button
                                                if(opts.activeImage != 0) {
                                                        $('#prevLink,#prevLinkText').show().click(function() {
                                                                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() {
                                                                changeImage(opts.activeImage +1);
                                                                return false;
                                                        });
                                                }
                                        }

                                        enableKeyboardNav();
                                }
                        };

                        function keyboardAction(e) {
                                var o = e.data.opts;
                                var keycode = e.keyCode;
                                var escapeKey = 27;

                                var key = String.fromCharCode(keycode).toLowerCase();

                                // close lightbox
                                if ((key == 'x') || (key == 'o') || (key == 'c') || (keycode == escapeKey)) {
                                        end();

                                        // display previous image
                                } else if ((key == 'p') || (keycode == 37)) {
                                        if(o.loopImages) {
                                                disableKeyboardNav();
                                                changeImage((o.activeImage == 0) ? (o.imageArray.length - 1) : o.activeImage - 1);
                                        } else if (o.activeImage != 0) {
                                                disableKeyboardNav();
                                                changeImage(o.activeImage - 1);
                                        }

                                        // display next image
                                } else if ((key == 'n') || (keycode == 39)) {
                                        if (opts.loopImages) {
                                                disableKeyboardNav();
                                                changeImage((o.activeImage == (o.imageArray.length - 1)) ? 0 : o.activeImage + 1);
                                        } else if (o.activeImage != (o.imageArray.length - 1)) {
                                                disableKeyboardNav();
                                                changeImage(o.activeImage + 1);
                                        }
                                }
                        };

                        function enableKeyboardNav() {
                                $(document).bind('keydown', {opts: opts}, keyboardAction);
                        };

                        function disableKeyboardNav() {
                                $(document).unbind('keydown');
                        };
                };

                $.fn.lightbox.parseJsonData = function(data) {
                        var imageArray = [];

                        $.each(data, function() {
                                imageArray.push(new Array(this.url, this.title));
                        });

                        return imageArray;
                };

                $.fn.lightbox.defaults = {
                        allSet: false,
                        fileLoadingImage: 'pics/loading.gif',
                        fileBottomNavCloseImage: 'pics/close.png',
                        overlayOpacity: 0.6,
                        borderSize: 10,
                        imageArray: new Array,
                        activeImage: null,
                        inprogress: false,
                        resizeSpeed: 300,
                        widthCurrent: 250,
                        heightCurrent: 250,
                        scaleImages: false,
                        xScale: 1,
                        yScale: 1,
                        displayTitle: true,
                        navbarOnTop: false,
                        displayDownloadLink: false,
                        slideNavBar: false,
                        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; Vorheriges',
                                nextLinkText:  'Nächstes &raquo;',
                                closeTitle: 'Schließen',
                                image: 'Bild ',
                                of: ' von ',
                                download: 'Download'
                        },
                        fitToScreen: false,
                        disableNavbarLinks: false,
                        loopImages: false,
                        imageClickClose: true,
                        jsonData: null,
                        jsonDataParser: null
                };
})(jQuery);