/*
Created By: Chris Campbell
Website: http://particletree.com
Date: 2/1/2006

Adapted By: Simon de Haan
Website: http://blog.eight.nl
Date: 21/2/2006

Inspired by the lightbox implementation found at http://www.huddletogether.com/projects/lightbox/
And the lightbox gone wild by ParticleTree at http://particletree.com/features/lightbox-gone-wild/

*/

/*-------------------------------GLOBAL VARIABLES------------------------------------*/

var detect = navigator.userAgent.toLowerCase();
var OS,browser,version,total,thestring;

/*-----------------------------------------------------------------------------------------------*/

//Browser detect script origionally created by Peter Paul Koch at http://www.quirksmode.org/

function getBrowserInfo() {
	if (checkIt('konqueror')) {
		browser = "Konqueror";
		OS = "Linux";
	}
	else if (checkIt('safari')) browser 	= "Safari";
	else if (checkIt('omniweb')) browser 	= "OmniWeb";
	else if (checkIt('opera')) browser 		= "Opera";
	else if (checkIt('webtv')) browser 		= "WebTV";
	else if (checkIt('icab')) browser 		= "iCab";
	else if (checkIt('msie')) browser 		= "Internet Explorer";
	else if (!checkIt('compatible')) {
		browser = "Netscape Navigator";
		version = detect.charAt(8);
	}
	else browser = "An unknown browser";

//	if (!version) version = detect.charAt(place + thestring.length);

	if (!OS) {
		if (checkIt('linux')) OS 		= "Linux";
		else if (checkIt('x11')) OS 	= "Unix";
		else if (checkIt('mac')) OS 	= "Mac";
		else if (checkIt('win')) OS 	= "Windows";
		else OS 								= "an unknown operating system";
	}
}

function checkIt(string) {
	var place = detect.indexOf(string) + 1;
	thestring = string;
	return place;
}

/*-----------------------------------------------------------------------------------------------*/

//Event.observe(window, 'load', initialize, false);
//Event.observe(window, 'load', getBrowserInfo, false);
//Event.observe(window, 'unload', Event.unloadCache, false);

var leightbox = Class.create();

leightbox.prototype = {

	yPos : 0,
	xPos : 0,
    curWidth : 640,

	initialize: function(ctrl) {
		this.content = ctrl;
//		Event.observe(ctrl, 'click', this.activate.bindAsEventListener(this), false);
//		ctrl.onclick = function(){return false;};
	},
	
	// Turn everything on - mainly the IE fixes
	activate: function(){
		if (browser == 'Internet Explorer'){
			this.getScroll();
			this.prepareIE('100%', 'hidden');
			this.setScroll(0,0);
			this.hideSelects('hidden');
		}
		this.displayLightbox("block");
	},
	
	// Ie requires height to 100% and overflow hidden or else you can scroll down past the lightbox
	prepareIE: function(height, overflow){
		var bod = document.getElementsByTagName('body')[0];
		bod.style.height = height;
		bod.style.overflow = overflow;
  
		var htm = document.getElementsByTagName('html')[0];
		htm.style.height = height;
		htm.style.overflow = overflow; 
	},
	
	// In IE, select elements hover on top of the lightbox
	hideSelects: function(visibility){
		var selects = document.getElementsByTagName('select');
		for(var i = 0; i < selects.length; i++) {
			selects[i].style.visibility = visibility;
		}
	},
	
	// Taken from lightbox implementation found at http://www.huddletogether.com/projects/lightbox/
	getScroll: function(){
		if (self.pageYOffset) {
			this.yPos = self.pageYOffset;
		} else if (document.documentElement && document.documentElement.scrollTop){
			this.yPos = document.documentElement.scrollTop; 
		} else if (document.body) {
			this.yPos = document.body.scrollTop;
		}
	},
	
	setScroll: function(x, y){
		window.scrollTo(x, y); 
	},

    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, pageHeight, pageWidth;

        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;
        }

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

    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;
        }

        return new Array(xScroll,yScroll);
    },

	displayLightbox: function(display){
        var overlay = document.getElementById("leightbox-overlay");
        var lb = document.getElementById(this.content);

		if(display != 'none') {
            var arrayPageSize = this.getPageSize();
            var arrayPageScroll = this.getPageScroll();

            overlay.style.height = arrayPageSize[1] + "px";

            var lightboxTop = arrayPageScroll[1] + (arrayPageSize[3] - 428) / 2;
            var lightboxLeft = arrayPageScroll[0] + (arrayPageSize[2] - this.curWidth) / 2;

            lb.style.top = lightboxTop + "px";
            lb.style.left = lightboxLeft + "px";
        }

		lb.style.display = display;
        overlay.style.display = display;

//		if(display != 'none') this.actions();
	},

    setWidth: function(wid){
        var lb = document.getElementById(this.content);
        this.curWidth = wid;
        lb.style.width = wid+"px";        
    },
	
	// Search through new links within the lightbox, and attach click event
	actions: function(){
		var lbActions = document.getElementsByClassName('lbAction');

		for(var i = 0; i < lbActions.length; i++) {
			Event.observe(lbActions[i], 'click', this[lbActions[i].rel].bindAsEventListener(this), false);
			lbActions[i].onclick = function(){return false;};
		}

	},
	
	// Example of creating your own functionality once lightbox is initiated
	deactivate: function(){
		if (browser == "Internet Explorer"){
			this.setScroll(0,this.yPos);
			this.prepareIE("auto", "auto");
			this.hideSelects("visible");
		}
		
		this.displayLightbox("none");
	}
};

/*-----------------------------------------------------------------------------------------------*/

// Onload, make all links that need to trigger a lightbox active
function leightbox_initialize(){
    getBrowserInfo();
	addLightboxMarkup();
}

// Add in markup necessary to make this work. Basically two divs:
// Overlay holds the shadow
// Lightbox is the centered square that the content is put into.
function addLightboxMarkup()
{
	var overlay = document.createElement('div');
	overlay.id = 'leightbox-overlay';

	document.body.appendChild(overlay);
}