/*
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;

var loadingImage = "\\images\\loading.gif";

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

//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();

function moveToTop(id) {
   var oldid = $(id);
   if(!oldid.movedToTop) {
      var bod = document.getElementsByTagName('body')[0];
      bod.insertBefore(oldid, bod.firstChild);
      oldid.movedToTop = true;
   }
   return oldid;
}

lightbox.prototype = {

	yPos : 0,
	xPos : 0,

	initialize: function(ctrl) {
      switch(typeof(ctrl)) {
         case 'object':
            switch(ctrl.tagName) {
               case 'A':
                  this.content = ctrl.rel;
                  Event.observe(ctrl, 'click', this.activate.bindAsEventListener(this), false);
                  ctrl.onclick = function(){return false;};
                  break;
               case 'DIV':
                  this.content = moveToTop(ctrl.id);
                  return this.content;
            }
            break;
         case 'string':
            this.content = moveToTop(ctrl);
            return;
      }
	},
   
   showLoading: function() {

      var objOverlay = $('overlay');
      var objLoadingImage = $('overlayloading');
      
      var arrayPageSize = getPageSize();
      var arrayPageScroll = getPageScroll();
   
      if (objLoadingImage) {
         objLoadingImage.style.top = (arrayPageScroll[1] + ((arrayPageSize[3] - objLoadingImage.height) / 2) + 'px');
   		objLoadingImage.style.left = (((arrayPageSize[0] - 100 - (objLoadingImage.width*2)) / 2) + 'px');
      }
      
      objOverlay.style.height = (arrayPageSize[1] + 'px');
      objOverlay.style.display = 'block';
      
      this.hideSelects('hidden');
   },
   
   stopLoading: function() {
      this.deactivate();
   },
	
	// 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){
		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; 
	},
	
	// In IE, select elements hover on top of the lightbox
	hideSelects: function(visibility){
		selects = document.getElementsByTagName('select');
		for(i = 0; i < selects.length; i++) {
         if(visibility == 'hidden')
            Element.hide(selects[i]);
         else
            Element.show(selects[i]);
		}
      var innerSelectes = Form.getElements(this.content);
      $A(innerSelectes).each(function(obj){
         if(obj.tagName == 'SELECT'){
            Element.show(obj);
         }
      });
	},
	
	// 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); 
	},
	
	displayLightbox: function(display) {
      
      var arrayPageSize = getPageSize();
      var arrayPageScroll = getPageScroll();
      
      var contentBox = $(this.content);
      contentBox.style.top = (arrayPageScroll[1] + ((arrayPageSize[3] - parseFloat(contentBox.style.height)) / 2) + 'px');
      
		$('overlay').style.display = display;
		contentBox.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("", "");
			this.hideSelects("visible");
		}
		
		this.displayLightbox("none");
	}
}

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;
}

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;
}
/*-----------------------------------------------------------------------------------------------*/

// 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';
	overlay.style.display= 'none';
   
   if (loadingImage != '') {
      loading = document.createElement('img');
      loading.id = 'overlayloading';
      loading.src = loadingImage;
      loading.style.position = 'absolute';
      loading.style.display= 'none';
      
      overlay.appendChild(loading);
   }
   
   bod.insertBefore(overlay, bod.firstChild);
}