/**
 * 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="numberDisplay"></span></div><div id="bottomNav">'
                var title = '<div id="titleContainer" class="clearfix"><div id="imageData"><span id="caption"></span></div></div>';

                if (opts.displayHelp)
                        imageData += '<span id="helpDisplay">' + opts.strings.help + '</span>';

                imageData += '<a href="javascript://" id="bottomNavClose" title="' + opts.strings.closeTitle + '">Закрыть</a></div></div></div>';

                var string;

                if (opts.navbarOnTop) {
                  string = '<div id="overlay"></div><div id="lightbox">' + title + imageData + outerImage + '</div>';
                  $("body").append(string);
                  $("#imageDataContainer").addClass('ontop');
                } else {
                  string = '<div id="overlay"></div><div id="lightbox">' + title + outerImage + imageData + '</div>';
                  $("body").append(string);
                }
                $("#titleContainer").addClass('ontop');

                $("#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);
                $('#titleContainer').width(opts.widthCurrent);
                $('#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;

                $('#titleContainer').animate({width: widthNew},opts.resizeSpeed,'linear');
                $('#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;
                        } 
                        //else  {
                        //        nav_html = '<font id="nextLinkText">' + opts.strings.prevLinkText + '</font>&nbsp;' + nav_html;
                        //} 

                        if ((opts.activeImage + 1) < opts.imageArray.length) {
                                nav_html += '<a title="' + opts.strings.nextLinkTitle + '" href="#" id="nextLinkText">' + opts.strings.nextLinkText + "</a>";
                        }
                        // else {
                        //        nav_html += '<font id="nextLinkText">' + opts.strings.nextLinkText + '</font>';
                        //}


                        $('#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 = '';
        };

        $.fn.lightbox.defaults = {
                fileLoadingImage : 'img/loading.gif',
                fileBottomNavCloseImage : 'img/close.gif',
                overlayOpacity : 0.8,
                borderSize : 10,
                imageArray : new Array,
                activeImage : null,
                inprogress : false,
                resizeSpeed : 300,
                widthCurrent: 250,
                heightCurrent: 250,
                xScale : 1,
                yScale : 1,
                displayTitle: true,
                navbarOnTop: false,
                slideNavBar: false, // slide nav bar up/down between image resizing transitions
                navBarSlideSpeed: 250,
                displayHelp: false,
                strings : {
                        help: ' \u2190 / P - предыдущее фото\u00a0\u00a0\u00a0\u00a0\u2192 / N - следующее фото\u00a0\u00a0\u00a0\u00a0ESC / X - закрыть галерею',
                        prevLinkTitle: 'предыдущее фото',
                        nextLinkTitle: 'следующее фото',
                        prevLinkText:  '&laquo; Предыдущее',
                        nextLinkText:  'Следующее &raquo;',
                        closeTitle: 'закрыть галерею',
                        image: 'Фото ',
                        of: ' из '
                },
                fitToScreen: true              // resize images if they are bigger than window
        };
})(jQuery);function initLightbox(){$('a.lightbox').lightbox();}