var fileLoadingImage = "/Content/Shared/Images/Loading.gif";
var fileBottomNavCloseImage = "/Content/Shared/Images/Closelabel.gif";

var overlayOpacity = 0.8; // controls transparency of shadow overlay

var animate = true; 		// toggles resizing animations
var resizeSpeed = 7; 	// controls the speed of the image resizing animations (1=slowest and 10=fastest)

var borderSize = 10; 	//if you adjust the padding in the CSS, you will need to update this variable
var lightboxHiddenDiv;
// -----------------------------------------------------------------------------------

//
//	Global Variables
//
var imageArray = new Array;
var activeImage;

if (animate == true)
{
    overlayDuration = 0.2; // shadow fade in/out duration
    if (resizeSpeed > 10) { resizeSpeed = 10; }
    if (resizeSpeed < 1) { resizeSpeed = 1; }
    resizeDuration = (11 - resizeSpeed) * 0.15;
} else
{
    overlayDuration = 0;
    resizeDuration = 0;
}


Object.extend(Element, {
    getWidth: function (element)
    {
        element = $(element);
        return element.offsetWidth;
    },
    setWidth: function (element, w)
    {
        element = $(element);
        element.style.width = w + "px";
    },
    setHeight: function (element, h)
    {
        element = $(element);
        element.style.height = h + "px";
    },
    setTop: function (element, t)
    {
        element = $(element);
        element.style.top = t + "px";
    },
    setLeft: function (element, l)
    {
        element = $(element);
        element.style.left = l + "px";
    },
    setSrc: function (element, src)
    {
        element = $(element);
        element.src = src;
    },
    setHref: function (element, href)
    {
        element = $(element);
        element.href = href;
    },
    setInnerHTML: function (element, content)
    {
        element = $(element);
        element.innerHTML = content;
    }
});


Array.prototype.removeDuplicates = function ()
{
    for (i = 0; i < this.length; i++)
    {
        for (j = this.length - 1; j > i; j--)
        {
            if (this[i][0] == this[j][0])
            {
                this.splice(j, 1);
            }
        }
    }
}

Array.prototype.empty = function ()
{
    for (i = 0; i <= this.length; i++)
    {
        this.shift();
    }
}

var Lightbox = Class.create();

Lightbox.prototype = {

    initialize: function ()
    {

        this.updateImageList();

        var objBody = document.getElementsByTagName("body").item(0);

        var objOverlay = document.createElement("div");
        objOverlay.setAttribute('id', 'overlay');
        objOverlay.style.display = 'none';
        objOverlay.onclick = function () { myLightbox.end(); }
        objBody.appendChild(objOverlay);

        var objLightbox = document.createElement("div");
        objLightbox.setAttribute('id', 'lightbox');
        objLightbox.style.display = 'none';
        objLightbox.onclick = function (e)
        {	// close Lightbox is user clicks shadow overlay
            if (!e) var e = window.event;
            var clickObj = Event.element(e).id;
            if (clickObj == 'lightbox')
            {
                myLightbox.end();
            }
        };
        objBody.appendChild(objLightbox);

        var objOuterImageContainer = document.createElement("div");
        objOuterImageContainer.setAttribute('id', 'outerImageContainer');
        objLightbox.appendChild(objOuterImageContainer);

        if (animate)
        {
            Element.setWidth('outerImageContainer', 250);
            Element.setHeight('outerImageContainer', 250);
        } else
        {
            Element.setWidth('outerImageContainer', 1);
            Element.setHeight('outerImageContainer', 1);
        }

        var objImageContainer = document.createElement("div");
        objImageContainer.setAttribute('id', 'imageContainer');
        objOuterImageContainer.appendChild(objImageContainer);

        var objLightboxImage = document.createElement("img");
        objLightboxImage.setAttribute('id', 'lightboxImage');
        objImageContainer.appendChild(objLightboxImage);

        var objHoverNav = document.createElement("div");
        objHoverNav.setAttribute('id', 'hoverNav');
        objImageContainer.appendChild(objHoverNav);

        var objPrevLink = document.createElement("a");
        objPrevLink.setAttribute('id', 'prevLink');
        objPrevLink.setAttribute('href', '#');
        objHoverNav.appendChild(objPrevLink);

        var objNextLink = document.createElement("a");
        objNextLink.setAttribute('id', 'nextLink');
        objNextLink.setAttribute('href', '#');
        objHoverNav.appendChild(objNextLink);

        var objLoading = document.createElement("div");
        objLoading.setAttribute('id', 'loading');
        objImageContainer.appendChild(objLoading);

        var objLoadingLink = document.createElement("a");
        objLoadingLink.setAttribute('id', 'loadingLink');
        objLoadingLink.setAttribute('href', '#');
        objLoadingLink.onclick = function () { myLightbox.end(); return false; }
        objLoading.appendChild(objLoadingLink);

        var objLoadingImage = document.createElement("img");
        objLoadingImage.setAttribute('src', fileLoadingImage);
        objLoadingLink.appendChild(objLoadingImage);

        var objImageDataContainer = document.createElement("div");
        objImageDataContainer.setAttribute('id', 'imageDataContainer');
        objLightbox.appendChild(objImageDataContainer);

        var objImageData = document.createElement("div");
        objImageData.setAttribute('id', 'imageData');
        objImageDataContainer.appendChild(objImageData);

        var objImageDetails = document.createElement("div");
        objImageDetails.setAttribute('id', 'imageDetails');
        objImageData.appendChild(objImageDetails);

        var objCaption = document.createElement("span");
        objCaption.setAttribute('id', 'caption');
        objImageDetails.appendChild(objCaption);

        var objNumberDisplay = document.createElement("span");
        objNumberDisplay.setAttribute('id', 'numberDisplay');
        objImageDetails.appendChild(objNumberDisplay);

        var objBottomNav = document.createElement("div");
        objBottomNav.setAttribute('id', 'bottomNav');
        objImageData.appendChild(objBottomNav);

        var objBottomNavCloseLink = document.createElement("a");
        objBottomNavCloseLink.setAttribute('id', 'bottomNavClose');
        objBottomNavCloseLink.setAttribute('href', '#');
        objBottomNavCloseLink.onclick = function () { myLightbox.end(); return false; }
        objBottomNav.appendChild(objBottomNavCloseLink);

        var objBottomNavCloseImage = document.createElement("img");
        objBottomNavCloseImage.setAttribute('src', fileBottomNavCloseImage);
        objBottomNavCloseLink.appendChild(objBottomNavCloseImage);
    },

    updateImageList: function ()
    {
        if (!document.getElementsByTagName) { return; }
        var anchors = document.getElementsByTagName('a');
        var areas = document.getElementsByTagName('area');

        for (var i = 0; i < anchors.length; i++)
        {
            var anchor = anchors[i];
            var relAttribute = String(anchor.getAttribute('rel'));
            if (anchor.getAttribute('href') && (relAttribute.toLowerCase().match('lightbox')))
            {
                anchor.onclick = function () { myLightbox.start(this); return false; }
            }
        }

        for (var i = 0; i < areas.length; i++)
        {
            var area = areas[i];

            var relAttribute = String(area.getAttribute('rel'));

            if (area.getAttribute('href') && (relAttribute.toLowerCase().match('lightbox')))
            {
                area.onclick = function () { myLightbox.start(this); return false; }
            }
        }
        //vincent...
        if (lightboxHiddenDiv)
        {
            document.getElementById(lightboxHiddenDiv).style.display = "inline";
        }
    },


    start: function (imageLink)
    {

        hideSelectBoxes();
        hideFlash();

        var arrayPageSize = getPageSize();
        Element.setWidth('overlay', arrayPageSize[0]);
        Element.setHeight('overlay', arrayPageSize[1]);

        new Effect.Appear('overlay', { duration: overlayDuration, from: 0.0, to: overlayOpacity });

        imageArray = [];
        imageNum = 0;

        if (!document.getElementsByTagName) { return; }
        var anchors = document.getElementsByTagName(imageLink.tagName);

        if ((imageLink.getAttribute('rel') == 'lightbox'))
        {
            imageArray.push(new Array(imageLink.getAttribute('href'), imageLink.getAttribute('title')));
        } else
        {
            for (var i = 0; i < anchors.length; i++)
            {
                var anchor = anchors[i];
                if (anchor.getAttribute('href') && (anchor.getAttribute('rel') == imageLink.getAttribute('rel')))
                {
                    imageArray.push(new Array(anchor.getAttribute('href'), anchor.getAttribute('title')));
                }
            }
            imageArray.removeDuplicates();
            while (imageArray[imageNum][0] != imageLink.getAttribute('href')) { imageNum++; }
        }

        var arrayPageScroll = getPageScroll();
        var lightboxTop = arrayPageScroll[1] + (arrayPageSize[3] / 10);
        var lightboxLeft = arrayPageScroll[0];
        Element.setTop('lightbox', lightboxTop);
        Element.setLeft('lightbox', lightboxLeft);

        Element.show('lightbox');

        this.changeImage(imageNum);
    },

    changeImage: function (imageNum)
    {

        activeImage = imageNum; // update global var

        if (animate) { Element.show('loading'); }
        Element.hide('lightboxImage');
        Element.hide('hoverNav');
        Element.hide('prevLink');
        Element.hide('nextLink');
        Element.hide('imageDataContainer');
        Element.hide('numberDisplay');

        imgPreloader = new Image();

        imgPreloader.onload = function ()
        {
            Element.setSrc('lightboxImage', imageArray[activeImage][0]);
            myLightbox.resizeImageContainer(imgPreloader.width, imgPreloader.height);

            imgPreloader.onload = function () { }; //	clear onLoad, IE behaves irratically with animated gifs otherwise 
        }
        imgPreloader.src = imageArray[activeImage][0];
    },

    resizeImageContainer: function (imgWidth, imgHeight)
    {

        this.widthCurrent = Element.getWidth('outerImageContainer');
        this.heightCurrent = Element.getHeight('outerImageContainer');

        var widthNew = (imgWidth + (borderSize * 2));
        var heightNew = (imgHeight + (borderSize * 2));

        this.xScale = (widthNew / this.widthCurrent) * 100;
        this.yScale = (heightNew / this.heightCurrent) * 100;

        wDiff = this.widthCurrent - widthNew;
        hDiff = this.heightCurrent - heightNew;

        if (!(hDiff == 0)) { new Effect.Scale('outerImageContainer', this.yScale, { scaleX: false, duration: resizeDuration, queue: 'front' }); }
        if (!(wDiff == 0)) { new Effect.Scale('outerImageContainer', this.xScale, { scaleY: false, delay: resizeDuration, duration: resizeDuration }); }

        if ((hDiff == 0) && (wDiff == 0))
        {
            if (navigator.appVersion.indexOf("MSIE") != -1) { pause(250); } else { pause(100); }
        }

        Element.setHeight('prevLink', imgHeight);
        Element.setHeight('nextLink', imgHeight);
        Element.setWidth('imageDataContainer', widthNew);

        this.showImage();
    },

    showImage: function ()
    {
        Element.hide('loading');
        new Effect.Appear('lightboxImage', { duration: resizeDuration, queue: 'end', afterFinish: function () { myLightbox.updateDetails(); } });
        this.preloadNeighborImages();
    },

    updateDetails: function ()
    {

        if (imageArray[activeImage][1])
        {
            Element.show('caption');
            Element.setInnerHTML('caption', imageArray[activeImage][1]);
        }

        if (imageArray.length > 1)
        {
            Element.show('numberDisplay');
            Element.setInnerHTML('numberDisplay', "Foto " + eval(activeImage + 1) + " van " + imageArray.length);
        }

        new Effect.Parallel(
			[new Effect.SlideDown('imageDataContainer', { sync: true, duration: resizeDuration, from: 0.0, to: 1.0 }),
			  new Effect.Appear('imageDataContainer', { sync: true, duration: resizeDuration })],
			{ duration: resizeDuration, afterFinish: function ()
			{
			    var arrayPageSize = getPageSize();
			    Element.setHeight('overlay', arrayPageSize[1]);
			    myLightbox.updateNav();
			}
			}
		);
    },

    updateNav: function ()
    {

        Element.show('hoverNav');
        if (activeImage != 0)
        {
            Element.show('prevLink');
            document.getElementById('prevLink').onclick = function ()
            {
                myLightbox.changeImage(activeImage - 1); return false;
            }
        }
        if (activeImage != (imageArray.length - 1))
        {
            Element.show('nextLink');
            document.getElementById('nextLink').onclick = function ()
            {
                myLightbox.changeImage(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
            myLightbox.end();
        } else if ((key == 'p') || (keycode == 37))
        {	// display previous image
            if (activeImage != 0)
            {
                myLightbox.disableKeyboardNav();
                myLightbox.changeImage(activeImage - 1);
            }
        } else if ((key == 'n') || (keycode == 39))
        {	// display next image
            if (activeImage != (imageArray.length - 1))
            {
                myLightbox.disableKeyboardNav();
                myLightbox.changeImage(activeImage + 1);
            }
        }

    },

    preloadNeighborImages: function ()
    {

        if ((imageArray.length - 1) > activeImage)
        {
            preloadNextImage = new Image();
            preloadNextImage.src = imageArray[activeImage + 1][0];
        }
        if (activeImage > 0)
        {
            preloadPrevImage = new Image();
            preloadPrevImage.src = imageArray[activeImage - 1][0];
        }

    },

    end: function ()
    {
        this.disableKeyboardNav();
        Element.hide('lightbox');
        new Effect.Fade('overlay', { duration: overlayDuration });
        showSelectBoxes();
        showFlash();
    }
}

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;
    }

    arrayPageScroll = new Array(xScroll, yScroll)
    return arrayPageScroll;
}

function getPageSize()
{

    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;
    }

    if (yScroll < windowHeight)
    {
        pageHeight = windowHeight;
    } else
    {
        pageHeight = yScroll;
    }

    if (xScroll < windowWidth)
    {
        pageWidth = xScroll;
    } else
    {
        pageWidth = windowWidth;
    }

    arrayPageSize = new Array(pageWidth, pageHeight, windowWidth, windowHeight)
    return arrayPageSize;
}

function getKey(e)
{
    if (e == null)
    { // ie
        keycode = event.keyCode;
    } else
    { // mozilla
        keycode = e.which;
    }
    key = String.fromCharCode(keycode).toLowerCase();

    if (key == 'x')
    {
    }
}

function listenKey() { document.onkeypress = getKey; }

// ---------------------------------------------------

function showSelectBoxes()
{
    var selects = document.getElementsByTagName("select");
    for (i = 0; i != selects.length; i++)
    {
        selects[i].style.visibility = "visible";
    }
}

// ---------------------------------------------------

function hideSelectBoxes()
{
    var selects = document.getElementsByTagName("select");
    for (i = 0; i != selects.length; i++)
    {
        selects[i].style.visibility = "hidden";
    }
}

// ---------------------------------------------------

function showFlash()
{
    var flashObjects = document.getElementsByTagName("object");
    for (i = 0; i < flashObjects.length; i++)
    {
        flashObjects[i].style.visibility = "visible";
    }

    var flashEmbeds = document.getElementsByTagName("embed");
    for (i = 0; i < flashEmbeds.length; i++)
    {
        flashEmbeds[i].style.visibility = "visible";
    }
}

// ---------------------------------------------------

function hideFlash()
{
    var flashObjects = document.getElementsByTagName("object");
    for (i = 0; i < flashObjects.length; i++)
    {
        flashObjects[i].style.visibility = "hidden";
    }

    var flashEmbeds = document.getElementsByTagName("embed");
    for (i = 0; i < flashEmbeds.length; i++)
    {
        flashEmbeds[i].style.visibility = "hidden";
    }

}

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

function initLightbox() { myLightbox = new Lightbox(); }
Event.observe(window, 'load', initLightbox, false);