/**
 * jQuery Lightbox
 * Version 0.5 - 11/29/2007
 * @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/)
 * Originally written to make use of the Prototype framework, and Script.acalo.us, now altered to use jQuery.
 *
 *
 **/

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

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

        /**
        * initalize()
        *
        * @return void
        * @author Warren Krewenki
        */
        function initialize() {
            $('#overlay').remove();
            $('#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" /><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 () { end(); }).hide();
            $("#lightbox").click(function () { end(); }).hide();
            $("#loadingLink").click(function () { end(); return false; });
            $("#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; });
            }
        };

        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;
        };

        function pause(ms) {
            var date = new Date();
            var curDate = null;
            do { curDate = new Date(); }
            while (curDate - date < ms);
        };

        function start(imageLink) {
            $("select, embed, object").hide();
            var arrayPageSize = getPageSize();
            $("#overlay").hide().css({
                width: '100%',
                height: arrayPageSize[1] + 'px',
                opacity: opts.overlayOpacity
            }).fadeIn();
            imageNum = 0;

            // if data is not provided by jsonData parameter
            if (!opts.jsonData) {
                opts.imageArray = [];
                // if image is NOT part of a set..
                if ((!imageLink.rel || (imageLink.rel == '')) && !opts.allSet) {
                    // 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 : ''));
						    }
						}
					);
                }
            }

            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] != imageLink.href) {
                    imageNum++;
                }
            }

            // calculate top and left offset for the lightbox
            var arrayPageScroll = 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();
            }

            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').hide();
                $('#hoverNav').hide();
                $('#prevLink').hide();
                $('#nextLink').hide();

                // delay preloading image until navbar will slide up
                if (opts.slideNavBar) {
                    $('#imageDataContainer').hide();
                    $('#imageData').hide();
                    doChangeImage();
                } else {
                    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();
            $('object, embed').show();
            $("select").each(function () {
                if (!$(this).hasClass("none"))
                {
                    $(this).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("fast");
            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();
            }

            var arrayPageSize = getPageSize();
            $('#overlay').height(arrayPageSize[1]);
            updateNav();
        };

        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: '/images/loading.gif',
        fileBottomNavCloseImage: '/images/closelabel.gif',
        overlayOpacity: 0.8,
        borderSize: 10,
        imageArray: new Array,
        activeImage: null,
        inprogress: false,
        resizeSpeed: 350,
        widthCurrent: 250,
        heightCurrent: 250,
        scaleImages: false,
        xScale: 1,
        yScale: 1,
        displayTitle: true,
        navbarOnTop: false,
        displayDownloadLink: false,

        // slide nav bar up/down between image resizing transitions
        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: 'previous image',
            nextLinkTitle: 'next image',
            prevLinkText: '&laquo; Previous',
            nextLinkText: 'Next &raquo;',
            closeTitle: 'close image gallery',
            image: 'Image ',
            of: ' of ',
            download: 'Download'
        },

        // resize images if they are bigger than window
        fitToScreen: false,

        disableNavbarLinks: false,
        loopImages: false,
        imageClickClose: true,
        jsonData: null,
        jsonDataParser: null
    };
})(jQuery);