/*
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) {
	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 lightbox = Class.create();

lightbox.prototype = {

	yPos : 0,
	xPos : 0,

	initialize: function(ctrl) {
	    if(ctrl) {
	        this.content = ctrl.rel;
	        Event.observe(ctrl, 'click', this.activate.bindAsEventListener(this), false);
            if (!ctrl.onclick)
            {
                ctrl.onclick = function(){return false;};
            }
	    }
	},

	initCallable: function(rel) {
	    this.content = rel;
	},
	
	// Turn everything on - mainly the IE fixes
	activate: function(e){
		if (browser == 'Internet Explorer'){
			this.getScroll();
			this.prepareIE('100%', 'hidden');
			this.setScroll(0,0);
			this.hideSelects('hidden');
		}
		
		if (browser == 'Netscape Navigator' && OS == 'Mac') {
			$('overlay').style.backgroundColor= "transparent";
			$('overlay').style.backgroundImage= "url('/includes/lightbox/overlay.png')";
		    $('overlay').style.backgroundRepeat="repeat";
			$('overlay').style.MozOpacity = 1;
			$('overlay').style.opacity = 1;
		} else {
		}
		
		var tg;
		if (!this.content) {
			if (!e) var e = window.event;
			tg = (window.event) ? e.srcElement : e.target;
		} else {
			tg = this.content; 
		}
		var pos = findPos(tg);
		
		this.hideAllLightboxes();
		
		this.displayLightbox("block");
		//if (!center) { this.setPosition(pos.left + 50, pos.top + 50); }
		window.lightboxOpen = true;
	},
	
	// Ie requires height to 100% and overflow hidden or else you can scroll down past the lightbox
	prepareIE: function(height, overflow){
		bod = document.getElementsByTagName('body')[0];
		bod.style.height = height;
		bod.style.overflow = overflow;
  
		htm = document.getElementsByTagName('html')[0];
		htm.style.height = height;
		htm.style.overflow = overflow; 
	},
	
	hideAllLightboxes: function() {
		var allLightboxes = $$('.leightbox');
		for (var i = 0; i < allLightboxes.length; i++) {
			allLightboxes[i].style.display = "none";
		}
	},
	
	// In IE, select elements hover on top of the lightbox
	hideSelects: function(visibility){
		//selects = document.getElementsByTagName('select');
		//for(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); 
	},
	
	setPosition: function(x, y) {
		var dims = getViewportDimensions();
		xMax = dims.width - $(this.content).offsetWidth - 40;
		yMax = dims.height - $(this.content).offsetHeight - 40;
		$(this.content).style.left = Math.min(x, xMax) + 'px';
		$(this.content).style.top = Math.min(y, yMax) + 'px';		
	},
	
	displayLightbox: function(display){
		$('overlay').style.display = display;
		$(this.content).style.display = display;
		if(display != 'none') this.actions();
	},
	
	// Search through new links within the lightbox, and attach click event
	actions: function(){
		lbActions = document.getElementsByClassName('lbAction');
		
		for(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");
		window.lightboxOpen = false;
	}
}

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

// Onload, make all links that need to trigger a lightbox active
function initialize(){
	addLightboxMarkup();
	lbox = document.getElementsByClassName('lbOn');
	for(i = 0; i < lbox.length; i++) {
		valid = new lightbox(lbox[i]);
	}
}

// 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() {

	bod 				= document.getElementsByTagName('body')[0];

	overlay 			= document.createElement('div');
	overlay.id			= 'overlay';

	bod.appendChild(overlay);
}

function findPos(obj) {	// Quirksmode.org
	var curleft = curtop = 0;
	if (obj.offsetParent) {
		curleft = obj.offsetLeft
		curtop = obj.offsetTop
		while (obj = obj.offsetParent) {
			curleft += obj.offsetLeft
			curtop += obj.offsetTop
		}
	}
	return { left:curleft, top:curtop };
}

function getViewportDimensions() {		// quirksmode.org
	var dims = new Object();
	if (self.innerHeight) // all except Explorer 
	{
		dims.width = self.innerWidth;
		dims.height = self.innerHeight;
	}
	else if (document.documentElement && document.documentElement.clientHeight)
		// Explorer 6 Strict Mode
	{
		dims.width = document.documentElement.clientWidth;
		dims.height = document.documentElement.clientHeight;
	}
	else if (document.body) // other Explorers
	{
		dims.width = document.body.clientWidth;
		dims.height = document.body.clientHeight;
	}
	return dims;
}