/*
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;
var currentLightbox;

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

//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(url, draggable, overlay) {
    this.draggable = draggable;
    this.overlay = overlay;
    this.content = url;
    this.activate();
    /*Event.observe(ctrl, 'click', this.activate.bindAsEventListener(this), false);
    //ctrl.onclick = function(){return false;}; */
  },
  
  // Turn everything on - mainly the IE fixes
  activate: function() {
    if (currentLightbox != null) {
      return;
    }
    if (browser == 'Internet Explorer'){
      this.getScroll();
      this.prepareIE('100%', 'hidden');
      this.setScroll(0,0);
      this.hideSelects('hidden');
    }
    this.displayLightbox("block");
    currentLightbox = this;
  },
  
  // 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){
    if ($('lightbox') != null) {
      if (this.overlay == true) {
        $('overlay').style.display = display;
      }
      $('lightbox').style.display = display;
      if(display != 'none') this.loadInfo();
    }
    else
    {
      alert('Null!');
    }
  },
  
  // 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();     
    if (this.draggable == true) {
      new Draggable('lightbox', {handle:'ajax_box_headline', starteffect: false, endeffect: false});
    }
  },
  
  // 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;};
    }

  },
  
  deactivate: function(){
    Element.remove($('lbContent'));
    
    if (browser == "Internet Explorer"){
      this.setScroll(0,this.yPos);
      this.prepareIE("auto", "auto");
      this.hideSelects("visible");
    }
    
    this.displayLightbox("none");
    $('lightbox').removeClassName('done');
    $('lightbox').addClassName('loading');
    
    currentLightbox = null;
  }
}

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

// 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() {
  return;
  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);
}