/**
 * 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;

            });

        });

    };



    // bind late instance

    $.fn.lightbox.latestart = function(_href, _title, _rel) {

        var obj = {

            href: _href,

            title: _title,

            rel: _rel,

            tagName: 'A'

        }

        $.fn.lightbox.start(obj);

        return false;

    }



    // lightbox functions

    $.fn.lightbox.initialize = function() {

        //alert('init');

        $('#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);

        //alert(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/misc/loading.gif',

        fileBottomNavCloseImage: '/images/misc/closelabel.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: 'previous image',

            nextLinkTitle: 'next image',

            prevLinkText: '&laquo; Previous',

            nextLinkText: 'Next &raquo;',

            closeTitle: 'close image gallery',

            image: 'Image ',

            of: ' of '

        },

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

    };

})(jQuery);