/*
    Lightbox JS: Fullsize Image Overlays
    by Lokesh Dhakar - http://www.huddletogether.com

    MODIFIED VERSION - Sean McBride ( http://www.alwaysbeta.com )
        - Close text link on the lightbox
        - Added fade in and out animations
        - Adds page elements at bottom instead of top (looks better without CSS)

    For more information on this script, visit:
    http://huddletogether.com/projects/lightbox/

    Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
    (basically, do anything you want, just leave my name and link)

    Table of Contents
    -----------------
    Configuration

    Functions
    - getPageScroll()
    - getPageSize()
    - pause()
    - showLightbox()
    - hideLightbox()
    - initLightbox()
    - addLoadEvent()

    Function Calls
    - addLoadEvent(initLightbox)

*/



//
// Configuration
//

// If you would like to use a loading image, point to it in the next line, otherwise leave as-is.
var loadingImage = imagePrefix+'loading.png';
var closeButton = imagePrefix+'close.gif';





//
// getPageScroll()
// Returns array with x,y page scroll values.
// Core code from - quirksmode.org
//
function getPageScroll(){

    var yScroll;

    if (self.pageYOffset) {
        yScroll = self.pageYOffset;
    } else if (document.documentElement && document.documentElement.scrollTop){	 // Explorer 6 Strict
        yScroll = document.documentElement.scrollTop;
    } else if (document.body) {// all other Explorers
        yScroll = document.body.scrollTop;
    }

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



//
// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.org
// Edit for Firefox by pHaez
//
function getPageSize(){

    var xScroll, yScroll;

    if (window.innerHeight && window.scrollMaxY) {
        xScroll = document.body.scrollWidth;
        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
        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 = windowWidth;
    } else {
        pageWidth = xScroll;
    }


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

//
// pause(numberMillis)
// Pauses code execution for specified time. Uses busy code, not good.
// Code from http://www.faqts.com/knowledge_base/view.phtml/aid/1602
//
function pause(numberMillis) {
    var now = new Date();
    var exitTime = now.getTime() + numberMillis;
    while (true) {
        now = new Date();
        if (now.getTime() > exitTime)
            return;
    }
}





//
// showLightbox()
// Preloads images. Pleaces new image in lightbox then centers and displays.
//
function showLightbox(objLink)
{
    // remove flashies
    var flashies = document.getElementsByClassName('sIFR-flash');
    for (var i = 0; i < flashies.length; i++) {
        flashies[i].style.display = 'none';
    }

    // prep objects
    var objOverlay = document.getElementById('overlay');
    var objLightbox = document.getElementById('lightbox');
    var objCaption = document.getElementById('lightboxCaption');
    var objImage = document.getElementById('lightboxImage');
    var objLoadingImage = document.getElementById('loadingImage');

    var arrayPageSize = getPageSize();
    var arrayPageScroll = getPageScroll();

    // center loadingImage if it exists
    if (objLoadingImage) {
        objLoadingImage.style.top = (arrayPageScroll[1] + ((arrayPageSize[3] - 35 - objLoadingImage.height) / 2) + 'px');
        objLoadingImage.style.left = (((arrayPageSize[0] - 40 - objLoadingImage.width) / 2) + 'px');
    }

    // set height of Overlay to take up whole page and show
    objOverlay.style.height = (arrayPageSize[1] + 'px');
    //objOverlay.style.display = 'block';
    objOverlay.anim.custom(0,.8);

    // preload image
    imgPreload = new Image();

    imgPreload.onload=function(){
        objImage.src = objLink.href;

        // center lightbox and make sure that the top and left values are not negative
        // and the image placed outside the viewport
        var lightboxTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - imgPreload.height) / 2);
        var lightboxLeft = ((arrayPageSize[0] - 40 - imgPreload.width) / 2);

        objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px";
        objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";



        if(objLink.getAttribute('title')){
            if (objCaption.childNodes.length) {
                for (i = 0; i < objCaption.childNodes.length; i++) {
                    objCaption.removeChild(objCaption.childNodes[i]);
                }
            }
            objCaption.style.display = 'block';
            objCaption.style.width = imgPreload.width + 'px';
            objCaption.appendChild(document.createTextNode(objLink.getAttribute('title')));
            //objCaption.innerHTML = objLink.getAttribute('title');
        } else {
            objCaption.style.display = 'none';
        }

        // A small pause between the image loading and displaying is required with IE,
        // this prevents the previous image displaying for a short burst causing flicker.
        //if (navigator.appVersion.indexOf("MSIE")!=-1){
        //	pause(250);
        //}
        // Don't need this with the setTimeout below:

        //objLightbox.style.display = 'block';
        setTimeout(objLightbox.anim.toggle.bind(objLightbox.anim),500);

        return false;
    }

    imgPreload.src = objLink.href;

}





//
// hideLightbox()
//
function hideLightbox()
{
    // get objects
    objOverlay = document.getElementById('overlay');
    objLightbox = document.getElementById('lightbox');

    // hide lightbox and overlay
    //objOverlay.style.display = 'none';
    //objLightbox.style.display = 'none';
    objOverlay.anim.custom(.8,0);
    setTimeout(objLightbox.anim.toggle.bind(objLightbox.anim),200);

    // put back flashies
    var flashies = document.getElementsByClassName('sIFR-flash');
    for (var i = 0; i < flashies.length; i++) {
        flashies[i].style.display = 'block';
    }
}




//
// initLightbox()
// Function runs on window load, going through link tags looking for rel="lightbox".
// These links receive onclick events that enable the lightbox display for their targets.
// The function also inserts html markup at the top of the page which will be used as a
// container for the overlay pattern and the inline image.
//
function initLightbox()
{

    if (!document.getElementsByTagName){ return; }
    var anchors = document.getElementsByTagName("a");

    // loop through all anchor tags
    for (var i=0; i<anchors.length; i++){
        var anchor = anchors[i];

        if (anchor.getAttribute("href") && (anchor.getAttribute("rel") == "lightbox")){
            anchor.onclick = function () {showLightbox(this); return false;}
        }
    }

    // the rest of this code inserts html at the top of the page that looks like this:
    //
    // <div id="overlay">
    //		<a href="#" onclick="hideLightbox(); return false;"><img id="loadingImage" /></a>
    //	</div>
    // <div id"lightbox">
    //		<div id="lightboxClose"><a href="#" onclick="hideLightbox(); return false;" title="Click to close">Close Lightbox</a></div>
    //		<a id="lightboxPhoto" href="#" onclick="hideLightbox(); return false;" title="Click anywhere to close image"><img /></a>
    //		<div id="lightboxCaption"></div>
    // </div>

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

    // create overlay div and hardcode some functional styles (aesthetic styles are in CSS file)
    var objOverlay = document.createElement("div");
    objOverlay.setAttribute('id','overlay');
    objOverlay.style.position = 'absolute';
    //objOverlay.style.display = 'none';	// This breaks the animation
    objOverlay.style.top = '0';
    objOverlay.style.left = '0';
    objOverlay.style.zIndex = '90';
    objOverlay.style.width = '100%';
    //objBody.insertBefore(objOverlay, objBody.firstChild);
    objBody.appendChild(objOverlay);

    var arrayPageSize = getPageSize();
    var arrayPageScroll = getPageScroll();

    // create overlay animation and hide it (Added my Sean McB)
    objOverlay.anim = new fx.Opacity(objOverlay, {duration: 400});
    objOverlay.anim.hide();

    // preload and create loader image
    var imgPreloader = new Image();

    // if loader image found, create link to hide lightbox and create loadingimage
    imgPreloader.onload=function(){

        var objLoadingImageLink = document.createElement("a");
        objLoadingImageLink.setAttribute('href','#');
        objLoadingImageLink.onclick = function () {hideLightbox(); return false;}
        objOverlay.appendChild(objLoadingImageLink);

        var objLoadingImage = document.createElement("img");
        objLoadingImage.src = loadingImage;
        objLoadingImage.setAttribute('id','loadingImage');
        objLoadingImage.style.position = 'absolute';
        objLoadingImage.style.zIndex = '150';
        objLoadingImageLink.appendChild(objLoadingImage);

        imgPreloader.onload=function(){};	//	clear onLoad, as IE will flip out w/animated gifs

        return false;
    }

    imgPreloader.src = loadingImage;

    // create lightbox div, same note about styles as above
    var objLightbox = document.createElement("div");
    objLightbox.setAttribute('id','lightbox');
    //objLightbox.style.display = 'none';	// This breaks the animation
    objLightbox.style.position = 'absolute';
    objLightbox.style.zIndex = '100';
    //objBody.insertBefore(objLightbox, objOverlay.nextSibling);
    objBody.appendChild(objLightbox);

    // create lightbox animation and initially hide
    objLightbox.anim = new fx.Height(objLightbox, {duration: 400});
    objLightbox.anim.hide();

    // create text close link (Added by Sean McB)
    //var objCloseLinkDiv = document.createElement("div");
    //objCloseLinkDiv.setAttribute('id','lightboxClose');
    //var objCloseLink = document.createElement("a");
    //objCloseLink.setAttribute('href','#');
    //objCloseLink.setAttribute('title','Click to close');
    //objCloseLink.onclick = function () {hideLightbox(); return false;}
    //objCloseLink.innerHTML = 'Close Lightbox';
    //objCloseLinkDiv.appendChild(objCloseLink);
    //objLightbox.appendChild(objCloseLinkDiv);

    // create link
    var objLink = document.createElement("a");
    objLink.setAttribute('href','#');
    objLink.setAttribute('id','lightboxPhoto');
    objLink.setAttribute('title','Click to close');
    objLink.onclick = function () {hideLightbox(); return false;}
    objLightbox.appendChild(objLink);

    // preload and create close button image
    var imgPreloadCloseButton = new Image();

    // if close button image found,
    imgPreloadCloseButton.onload=function(){

        var objCloseButton = document.createElement("img");
        objCloseButton.src = closeButton;
        objCloseButton.setAttribute('id','closeButton');
        objCloseButton.style.position = 'absolute';
        objCloseButton.style.top = 0;
        objCloseButton.style.right = 0;
        objCloseButton.style.zIndex = '200';
        objLink.appendChild(objCloseButton);

        return false;
    }

    imgPreloadCloseButton.src = closeButton;

    // create image
    var objImage = document.createElement("img");
    objImage.setAttribute('id','lightboxImage');
    objLink.appendChild(objImage);

    // create caption
    var objCaption = document.createElement("div");
    objCaption.setAttribute('id','lightboxCaption');
    objCaption.style.display = 'none';
    objLightbox.appendChild(objCaption);

}






addLoadEvent(initLightbox);	// run initLightbox onLoad