/**
 * jQuery Lightbox
 * Version 0.4 - 09/17/2007
 * @author Warren Krewenki
 *
 * 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.
 *
 **/
var Lightbox = {
    fileLoadingImage : "/hella-com-en/assets/images/layout_global/lightbox/loading.gif",
    fileBottomNavCloseImage : '/hella-com-en/assets/images/layout_global/lightbox/close.gif',
    overlayOpacity : 0.8,
    borderSize : 10,
    imageArray : new Array,
    activeImage : null,
    inprogress : false,
    resizeSpeed : 350,
    destroyElement: function(id){
        if(el = document.getElementById(id)){
            el.parentNode.removeChild(el);
        }
    },
    initialize: function() {    
        // attach lightbox to any links with rel 'lightbox'
        $("a").each(function(){
            if(this.rel.toLowerCase().match('lightbox')){
                $(this).click(function(){
                    Lightbox.start(this);
                    return false;
                });
            }
        });
        
        Lightbox.destroyElement('lightbox');
        $("body").append('<div id="overlay"></div><div id="lightbox"><div id="outerImageContainer" style="width:250px; height:250px;"><div id="imageContainer"><img id="lightboxImage"><div style="" id="hoverNav"><a href="#" id="prevLink"></a><a href="#" id="nextLink"></a></div><div id="loading"><a href="#" id="loadingLink"><img src="'+Lightbox.fileLoadingImage+'"></a></div></div></div><div id="imageDataContainer"><div id="imageData"><div id="imageDetails"><span id="caption"></span><span id="numberDisplay"></span></div><div id="bottomNav"><a href="#" id="bottomNavClose"><img src="'+Lightbox.fileBottomNavCloseImage+'"></a></div></div></div></div>');
        $("#overlay").click(function(){ Lightbox.end(); }).hide();
        $("#lightbox").click(function(){ Lightbox.end();}).hide();
        $("#loadingLink").click(function(){ Lightbox.end(); return false;});
        $("#bottomNavClose").click(function(){ Lightbox.end(); return false; });
        
    },
    
    //
    //    start()
    //    Display overlay and lightbox. If image is part of a set, add siblings to Lightbox.imageArray.
    //
    start: function(imageLink) {    
        $("select, embed, object").hide();
        
        // stretch overlay to fill page and fade in
        var arrayPageSize = Lightbox.getPageSize();
        $("#overlay").hide().css({width: '100%', height: arrayPageSize[1]+'px', opacity : Lightbox.overlayOpacity}).fadeIn();
        Lightbox.imageArray = [];
        imageNum = 0;        
        var anchors = document.getElementsByTagName( imageLink.tagName);
    
        // if image is NOT part of a set..
        if((imageLink.rel == 'lightbox')){
            // add single image to Lightbox.imageArray
            Lightbox.imageArray.push(new Array(imageLink.href, imageLink.title));            
        } else {
        // if image is part of a set..
            // loop through anchors, find other images in set, and add them to Lightbox.imageArray
            for (var i=0; i<anchors.length; i++){
                var anchor = anchors[i];
                if (anchor.href && (anchor.rel == imageLink.rel)){
                    Lightbox.imageArray.push(new Array(anchor.href, anchor.title));
                }
            }
            for(i = 0; i < Lightbox.imageArray.length; i++){
                for(j = Lightbox.imageArray.length-1; j>i; j--){        
                    if(Lightbox.imageArray[i][0] == Lightbox.imageArray[j][0]){
                        Lightbox.imageArray.splice(j,1);
                    }
                }
            }
            while(Lightbox.imageArray[imageNum][0] != imageLink.href) { imageNum++;}
        }
        // calculate top and left offset for the lightbox 
        var arrayPageScroll = Lightbox.getPageScroll();
        var lightboxTop = arrayPageScroll[1] + (arrayPageSize[3] / 10);
        var lightboxLeft = arrayPageScroll[0];
        $('#lightbox').css({top: lightboxTop+'px', left: lightboxLeft+'px'}).show();
        
        this.changeImage(imageNum);
    },
    //
    //    changeImage()
    //    Hide most elements and preload image in preparation for resizing image container.
    //
    changeImage: function(imageNum) {    
        if(this.inprogress == false){
            this.inprogress = true;
            Lightbox.activeImage = imageNum;    // update global var
            // hide elements during transition
            $('#loading').show();
            $('#lightboxImage').hide();
            $('#hoverNav').hide();
            $('#prevLink').hide();
            $('#nextLink').hide();
            $('#imageDataContainer').hide();
            $('#numberDisplay').hide();        
        
            imgPreloader = new Image();
        
            // once image is preloaded, resize image container
            imgPreloader.onload=function(){
                document.getElementById('lightboxImage').src = Lightbox.imageArray[Lightbox.activeImage][0];
                Lightbox.resizeImageContainer(imgPreloader.width, imgPreloader.height);
            }
            imgPreloader.src = Lightbox.imageArray[Lightbox.activeImage][0];
        }
    },
    //
    //    resizeImageContainer()
    //
    resizeImageContainer: function( imgWidth, imgHeight) {
        // get curren width and height
        this.widthCurrent = document.getElementById('outerImageContainer').offsetWidth;
        this.heightCurrent = document.getElementById('outerImageContainer').offsetHeight;
        // get new width and height
        var widthNew = (imgWidth  + (Lightbox.borderSize * 2));
        var heightNew = (imgHeight  + (Lightbox.borderSize * 2));
        // scalars based on change from old to new
        this.xScale = ( widthNew / this.widthCurrent) * 100;
        this.yScale = ( heightNew / this.heightCurrent) * 100;
        // calculate size difference between new and old image, and resize if necessary
        wDiff = this.widthCurrent - widthNew;
        hDiff = this.heightCurrent - heightNew;
        $('#outerImageContainer').animate({width: widthNew, height: heightNew},Lightbox.resizeSpeed,'linear',function(){
                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 (navigator.appVersion.indexOf("MSIE")!=-1){ Lightbox.pause(250); } else { Lightbox.pause(100);} 
        }
        $('#prevLink').css({height: imgHeight+'px'});
        $('#nextLink').css({height: imgHeight+'px'});
        $('#imageDataContainer').css({width: widthNew+'px'});
        
    },
    
    //
    //    showImage()
    //    Display image and begin preloading neighbors.
    //
    showImage: function(){
        $('#loading').hide();
        $('#lightboxImage').fadeIn("fast");
        Lightbox.updateDetails();
        this.preloadNeighborImages();
        this.inprogress = false;
    },
    //
    //    updateDetails()
    //    Display caption, image number, and bottom nav.
    //
    updateDetails: function() {
    $("#imageDataContainer").hide();
        // if caption is not null
        if(Lightbox.imageArray[Lightbox.activeImage][1]){
            $('#caption').html(Lightbox.imageArray[Lightbox.activeImage][1]).show();
        }
        
        // if image is part of set display 'Image x of x' 
        if(Lightbox.imageArray.length > 1){
            $('#numberDisplay').html("Image " + eval(Lightbox.activeImage + 1) + " of " + Lightbox.imageArray.length).show();
        }
        $("#imageDataContainer").hide().slideDown("slow");
        var arrayPageSize = Lightbox.getPageSize();
        $('#overLay').css({height: arrayPageSize[1]+'px'});
        Lightbox.updateNav();
    },
    //
    //    updateNav()
    //    Display appropriate previous and next hover navigation.
    //
    updateNav: function() {
        $('#hoverNav').show();                
        // if not first image in set, display prev image button
        if(Lightbox.activeImage != 0){
            $('#prevLink').show().click(function(){
                Lightbox.changeImage(Lightbox.activeImage - 1); return false;
            });
        }
        // if not last image in set, display next image button
        if(Lightbox.activeImage != (Lightbox.imageArray.length - 1)){
            $('#nextLink').show().click(function(){
                
                Lightbox.changeImage(Lightbox.activeImage +1); return false;
            });
        }
        
        this.enableKeyboardNav();
    },

    enableKeyboardNav: function() {
        document.onkeydown = this.keyboardAction; 
    },
    disableKeyboardNav: function() {
        document.onkeydown = '';
    },
    keyboardAction: function(e) {
        if (e == null) { // ie
            keycode = event.keyCode;
            escapeKey = 27;
        } else { // mozilla
            keycode = e.keyCode;
            escapeKey = e.DOM_VK_ESCAPE;
        }
        key = String.fromCharCode(keycode).toLowerCase();
        
        if((key == 'x') || (key == 'o') || (key == 'c') || (keycode == escapeKey)){    // close lightbox
            Lightbox.end();
        } else if((key == 'p') || (keycode == 37)){    // display previous image
            if(Lightbox.activeImage != 0){
                Lightbox.disableKeyboardNav();
                Lightbox.changeImage(Lightbox.activeImage - 1);
            }
        } else if((key == 'n') || (keycode == 39)){    // display next image
            if(Lightbox.activeImage != (Lightbox.imageArray.length - 1)){
                Lightbox.disableKeyboardNav();
                Lightbox.changeImage(Lightbox.activeImage + 1);
            }
        }
    },
    preloadNeighborImages: function(){
        if((Lightbox.imageArray.length - 1) > Lightbox.activeImage){
            preloadNextImage = new Image();
            preloadNextImage.src = Lightbox.imageArray[Lightbox.activeImage + 1][0];
        }
        if(Lightbox.activeImage > 0){
            preloadPrevImage = new Image();
            preloadPrevImage.src = Lightbox.imageArray[Lightbox.activeImage - 1][0];
        }
    
    },
    end: function() {
        this.disableKeyboardNav();
        $('#lightbox').hide();
        $("#overlay").fadeOut();
        $("select, object, embed").show();
    },
    
    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;
        }
        arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
        return arrayPageSize;
    },
    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;    
        }
        arrayPageScroll = new Array(xScroll,yScroll) 
        return arrayPageScroll;
    },
    pause : function(ms){
        var date = new Date();
        curDate = null;
        do{var curDate = new Date();}
        while( curDate - date < ms);
    }
};