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

Inspired by the lightbox implementation found at http://www.huddletogether.com/projects/lightbox/
*/

/*-------------------------------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) {
      this.content = ctrl.href;
      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){
      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++) {
         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); 
   },
   
   displayLightbox: function(display){
      $('overlay').style.display = display;
      $('lightbox').style.display = display;
      if(display != 'none') this.loadInfo();
   },
   
   // Begin Ajax request based off of the href of the clicked linked
   loadInfo: function() {
      var myAjax = new Ajax.Request(
        this.content,
        {method: 'post', parameters: "", onComplete: this.processInfo.bindAsEventListener(this)}
      );
      
   },
   
   // Display Ajax response
   processInfo: function(response){
      info = "<div id='lbContent'>" + response.responseText + "</div>";
      new Insertion.Before($('lbLoadMessage'), info)
      $('lightbox').className = "done";   
      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
   insert: function(e){
      link = Event.element(e).parentNode;
      Element.remove($('lbContent'));
    
      var myAjax = new Ajax.Request(
           link.href,
           {method: 'post', parameters: "", onComplete: this.processInfo.bindAsEventListener(this)}
      );
    
   },
   
   // Example of creating your own functionality once lightbox is initiated
   deactivate: function(){
      Element.remove($('lbContent'));
      
      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
var lbx;
function initialize(){
   addLightboxMarkup();
   lbox = document.getElementsByClassName('lbOn');
   for(i = 0; i < lbox.length; i++) {
      valid = new lightbox(lbox[i]);
      lbx=valid;
   }
}

// 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';
   lb               = document.createElement('div');
   lb.id            = 'lightbox';
   lb.className    = 'loading';
   lb.innerHTML   = '<div id="lbLoadMessage">' +
                    '<p>Loading</p>' +
                    '</div>';
   bod.appendChild(overlay);
   bod.appendChild(lb);
}