/**
 *  author:    Timothy Groves - http://www.brandspankingnew.net
 * version: 1.2 - 2006-11-17
 *              1.3 - 2006-12-04
 *              2.0 - 2007-02-07
 *              2.1.1 - 2007-04-13
 *              2.1.2 - 2007-07-07
 *              2.1.3 - 2007-07-19
 *
 */


if (typeof(bsn) == "undefined")
   _b = bsn = {};


if (typeof(_b.Autosuggest) == "undefined")
   _b.Autosuggest = {};
//else
//   alert("Autosuggest is already set!");












_b.AutoSuggest = function (id, param)
{
   // no DOM - give up!
   //
   if (!document.getElementById)
      return 0;




   // get field via DOM
   //
   this.fld = _b.DOM.gE(id);

   if (!this.fld)
      return 0;




   // init variables
   //
   this.sInp   = "";
   this.nInpC  = 0;
   this.aSug   = [];
   this.iHigh  = 0;




   // parameters object
   //
   this.oP = param ? param : {};

   // defaults
   //
   var k, def = {minchars:1, meth:"get", varname:"input", className:"autosuggest", timeout:2500, delay:500, offsety:-5, shownoresults: true, noresults: "No results!", maxheight: 250, cache: true, maxentries: 25};
   for (k in def)
   {
      if (typeof(this.oP[k]) != typeof(def[k]))
         this.oP[k] = def[k];
   }


   // set keyup handler for field
   // and prevent autocomplete from client
   //
   var p = this;

   // NOTE: not using addEventListener because UpArrow fired twice in Safari
   //_b.DOM.addEvent( this.fld, 'keyup', function(ev){ return pointer.onKeyPress(ev); } );

   this.fld.onkeypress  = function(ev){ return p.onKeyPress(ev); };
   this.fld.onkeyup     = function(ev){ return p.onKeyUp(ev); };

   this.fld.setAttribute("autocomplete","off");
};
















_b.AutoSuggest.prototype.onKeyPress = function(ev)
{

   var key = (window.event) ? window.event.keyCode : ev.keyCode;



   // set responses to keydown events in the field
   // this allows the user to use the arrow keys to scroll through the results
   // ESCAPE clears the list
   // TAB sets the current highlighted value
   //
   var RETURN = 13;
   var TAB = 9;
   var ESC = 27;

   var bubble = 1;

   switch(key)
   {
      case RETURN:
         this.setHighlightedValue();
         bubble = 0;
         break;

      case ESC:
         this.clearSuggestions();
         break;
   }

   return bubble;
};



_b.AutoSuggest.prototype.onKeyUp = function(ev)
{
   var key = (window.event) ? window.event.keyCode : ev.keyCode;



   // set responses to keydown events in the field
   // this allows the user to use the arrow keys to scroll through the results
   // ESCAPE clears the list
   // TAB sets the current highlighted value
   //

   var ARRUP = 38;
   var ARRDN = 40;

   var bubble = 1;

   switch(key)
   {


      case ARRUP:
         this.changeHighlight(key);
         bubble = 0;
         break;


      case ARRDN:
         this.changeHighlight(key);
         bubble = 0;
         break;


      default:
         this.getSuggestions(this.fld.value);
   }

   return bubble;


};








_b.AutoSuggest.prototype.getSuggestions = function (val)
{

   // if input stays the same, do nothing
   //
   if (val == this.sInp)
      return 0;


   // kill list
   //
   _b.DOM.remE(this.idAs);


   this.sInp = val;


   // input length is less than the min required to trigger a request
   // do nothing
   //
   if (val.length < this.oP.minchars)
   {
      this.aSug = [];
      this.nInpC = val.length;
      return 0;
   }




   var ol = this.nInpC; // old length
   this.nInpC = val.length ? val.length : 0;



   // if caching enabled, and user is typing (ie. length of input is increasing)
   // filter results out of aSuggestions from last request
   //
   var l = this.aSug.length;
   if (this.nInpC > ol && l && l<this.oP.maxentries && this.oP.cache)
   {
      var arr = [];
      for (var i=0;i<l;i++)
      {
         if (this.aSug[i].value.substr(0,val.length).toLowerCase() == val.toLowerCase())
            arr.push( this.aSug[i] );
      }
      this.aSug = arr;

      this.createList(this.aSug);



      return false;
   }
   else
   // do new request
   //
   {
      var pointer = this;
      var input = this.sInp;
      clearTimeout(this.ajID);
      this.ajID = setTimeout( function() { pointer.doAjaxRequest(input) }, this.oP.delay );
   }

   return false;
};





_b.AutoSuggest.prototype.doAjaxRequest = function (input)
{
   // check that saved input is still the value of the field
   //
   if (input != this.fld.value)
      return false;


   var pointer = this;


   // create ajax request
   //
   if (typeof(this.oP.script) == "function")
      var url = this.oP.script(encodeURIComponent(this.sInp));
   else
      var url = this.oP.script+this.oP.varname+"="+encodeURIComponent(this.sInp);

   if (!url)
      return false;

   var meth = this.oP.meth;
   var input = this.sInp;

   var onSuccessFunc = function (req) { pointer.setSuggestions(req, input) };
   //var onErrorFunc = function (status) { alert("AJAX error: "+status); };
   var onErrorFunc = function (status) { };

   var myAjax = new _b.Ajax();
   myAjax.makeRequest( url, meth, onSuccessFunc, onErrorFunc );
};





_b.AutoSuggest.prototype.setSuggestions = function (req, input)
{
   // if field input no longer matches what was passed to the request
   // don't show the suggestions
   //
   if (input != this.fld.value)
      return false;


   this.aSug = [];


   if (this.oP.json)
   {
      var jsondata = eval('(' + req.responseText + ')');

      for (var i=0;i<jsondata.results.length;i++)
      {
         this.aSug.push(  { 'id':jsondata.results[i].id, 'value':jsondata.results[i].value, 'info':jsondata.results[i].info }  );
      }
   }
   else
   {

      var xml = req.responseXML;

      // traverse xml
      //
      var results = xml.getElementsByTagName('results')[0].childNodes;

      for (var i=0;i<results.length;i++)
      {
         if (results[i].hasChildNodes())
            this.aSug.push(  { 'id':results[i].getAttribute('id'), 'value':results[i].childNodes[0].nodeValue, 'info':results[i].getAttribute('info') }  );
      }

   }

   this.idAs = "as_"+this.fld.id;


   this.createList(this.aSug);

};














_b.AutoSuggest.prototype.createList = function(arr)
{
   var pointer = this;




   // get rid of old list
   // and clear the list removal timeout
   //
   _b.DOM.remE(this.idAs);
   this.killTimeout();


   // if no results, and shownoresults is false, do nothing
   //
   if (arr.length == 0 && !this.oP.shownoresults)
      return false;


   // create holding div
   //
   var div = _b.DOM.cE("div", {id:this.idAs, className:this.oP.className});

   var hcorner = _b.DOM.cE("div", {className:"as_corner"});
   var hbar = _b.DOM.cE("div", {className:"as_bar"});
   var header = _b.DOM.cE("div", {className:"as_header"});
   header.appendChild(hcorner);
   header.appendChild(hbar);
   div.appendChild(header);




   // create and populate ul
   //
   var ul = _b.DOM.cE("ul", {id:"as_ul"});




   // loop throught arr of suggestions
   // creating an LI element for each suggestion
   //
   for (var i=0;i<arr.length;i++)
   {
      // format output with the input enclosed in a EM element
      // (as HTML, not DOM)
      //
      var val = arr[i].value;
      var st = val.toLowerCase().indexOf( this.sInp.toLowerCase() );
      var output = val.substring(0,st) + "<em>" + val.substring(st, st+this.sInp.length) + "</em>" + val.substring(st+this.sInp.length);


      var span       = _b.DOM.cE("span", {}, output, true);
      if (arr[i].info != "")
      {
         var br         = _b.DOM.cE("br", {});
         span.appendChild(br);
         var small      = _b.DOM.cE("small", {}, arr[i].info);
         span.appendChild(small);
      }

      var a          = _b.DOM.cE("a", { href:"#" });

      var tl      = _b.DOM.cE("span", {className:"tl"}, " ");
      var tr      = _b.DOM.cE("span", {className:"tr"}, " ");
      a.appendChild(tl);
      a.appendChild(tr);

      a.appendChild(span);

      a.name = i+1;
      a.onclick = function () { pointer.setHighlightedValue(); return false; };
      a.onmouseover = function () { pointer.setHighlight(this.name); };

      var li = _b.DOM.cE(  "li", {}, a  );

      ul.appendChild( li );
   }


   // no results
   //
   if (arr.length == 0 && this.oP.shownoresults)
   {
      var li = _b.DOM.cE(  "li", {className:"as_warning"}, this.oP.noresults  );
      ul.appendChild( li );
   }


   div.appendChild( ul );


   var fcorner = _b.DOM.cE("div", {className:"as_corner"});
   var fbar = _b.DOM.cE("div", {className:"as_bar"});
   var footer = _b.DOM.cE("div", {className:"as_footer"});
   footer.appendChild(fcorner);
   footer.appendChild(fbar);
   div.appendChild(footer);



   // get position of target textfield
   // position holding div below it
   // set width of holding div to width of field
   //
   var pos = _b.DOM.getPos(this.fld);

   div.style.left       = pos.x + "px";
   div.style.top     = ( pos.y + this.fld.offsetHeight + this.oP.offsety ) + "px";
   div.style.width   = this.fld.offsetWidth + "px";



   // set mouseover functions for div
   // when mouse pointer leaves div, set a timeout to remove the list after an interval
   // when mouse enters div, kill the timeout so the list won't be removed
   //
   div.onmouseover   = function(){ pointer.killTimeout() };
   div.onmouseout       = function(){ pointer.resetTimeout() };


   // add DIV to document
   //
   document.getElementsByTagName("body")[0].appendChild(div);



   // currently no item is highlighted
   //
   this.iHigh = 0;






   // remove list after an interval
   //
   var pointer = this;
   this.toID = setTimeout(function () { pointer.clearSuggestions() }, this.oP.timeout);
};















_b.AutoSuggest.prototype.changeHighlight = function(key)
{
   var list = _b.DOM.gE("as_ul");
   if (!list)
      return false;

   var n;

   if (key == 40)
      n = this.iHigh + 1;
   else if (key == 38)
      n = this.iHigh - 1;


   if (n > list.childNodes.length)
      n = list.childNodes.length;
   if (n < 1)
      n = 1;


   this.setHighlight(n);
};



_b.AutoSuggest.prototype.setHighlight = function(n)
{
   var list = _b.DOM.gE("as_ul");
   if (!list)
      return false;

   if (this.iHigh > 0)
      this.clearHighlight();

   this.iHigh = Number(n);

   list.childNodes[this.iHigh-1].className = "as_highlight";


   this.killTimeout();
};


_b.AutoSuggest.prototype.clearHighlight = function()
{
   var list = _b.DOM.gE("as_ul");
   if (!list)
      return false;

   if (this.iHigh > 0)
   {
      list.childNodes[this.iHigh-1].className = "";
      this.iHigh = 0;
   }
};


_b.AutoSuggest.prototype.setHighlightedValue = function ()
{
   if (this.iHigh)
   {
      this.sInp = this.fld.value = this.aSug[ this.iHigh-1 ].value;

      // move cursor to end of input (safari)
      //
      this.fld.focus();
      if (this.fld.selectionStart)
         this.fld.setSelectionRange(this.sInp.length, this.sInp.length);


      this.clearSuggestions();

      // pass selected object to callback function, if exists
      //
      if (typeof(this.oP.callback) == "function")
         this.oP.callback( this.aSug[this.iHigh-1] );
   }
};













_b.AutoSuggest.prototype.killTimeout = function()
{
   clearTimeout(this.toID);
};

_b.AutoSuggest.prototype.resetTimeout = function()
{
   clearTimeout(this.toID);
   var pointer = this;
   this.toID = setTimeout(function () { pointer.clearSuggestions() }, 1000);
};







_b.AutoSuggest.prototype.clearSuggestions = function ()
{

   this.killTimeout();

   var ele = _b.DOM.gE(this.idAs);
   var pointer = this;
   if (ele)
   {
      var fade = new _b.Fader(ele,1,0,250,function () { _b.DOM.remE(pointer.idAs) });
   }
};










// AJAX PROTOTYPE _____________________________________________


if (typeof(_b.Ajax) == "undefined")
   _b.Ajax = {};



_b.Ajax = function ()
{
   this.req = {};
   this.isIE = false;
};



_b.Ajax.prototype.makeRequest = function (url, meth, onComp, onErr)
{

   if (meth != "POST")
      meth = "GET";

   this.onComplete = onComp;
   this.onError = onErr;

   var pointer = this;

   // branch for native XMLHttpRequest object
   if (window.XMLHttpRequest)
   {
      this.req = new XMLHttpRequest();
      this.req.onreadystatechange = function () { pointer.processReqChange() };
      this.req.open("GET", url, true); //
      this.req.send(null);
   // branch for IE/Windows ActiveX version
   }
   else if (window.ActiveXObject)
   {
      this.req = new ActiveXObject("Microsoft.XMLHTTP");
      if (this.req)
      {
         this.req.onreadystatechange = function () { pointer.processReqChange() };
         this.req.open(meth, url, true);
         this.req.send();
      }
   }
};


_b.Ajax.prototype.processReqChange = function()
{

   // only if req shows "loaded"
   if (this.req.readyState == 4) {
      // only if "OK"
      if (this.req.status == 200)
      {
         this.onComplete( this.req );
      } else {
         this.onError( this.req.status );
      }
   }
};










// DOM PROTOTYPE _____________________________________________


if (typeof(_b.DOM) == "undefined")
   _b.DOM = {};



/* create element */
_b.DOM.cE = function ( type, attr, cont, html )
{
   var ne = document.createElement( type );
   if (!ne)
      return 0;

   for (var a in attr)
      ne[a] = attr[a];

   var t = typeof(cont);

   if (t == "string" && !html)
      ne.appendChild( document.createTextNode(cont) );
   else if (t == "string" && html)
      ne.innerHTML = cont;
   else if (t == "object")
      ne.appendChild( cont );

   return ne;
};



/* get element */
_b.DOM.gE = function ( e )
{
   var t=typeof(e);
   if (t == "undefined")
      return 0;
   else if (t == "string")
   {
      var re = document.getElementById( e );
      if (!re)
         return 0;
      else if (typeof(re.appendChild) != "undefined" )
         return re;
      else
         return 0;
   }
   else if (typeof(e.appendChild) != "undefined")
      return e;
   else
      return 0;
};



/* remove element */
_b.DOM.remE = function ( ele )
{
   var e = this.gE(ele);

   if (!e)
      return 0;
   else if (e.parentNode.removeChild(e))
      return true;
   else
      return 0;
};



/* get position */
_b.DOM.getPos = function ( e )
{
   var e = this.gE(e);

   var obj = e;

   var curleft = 0;
   if (obj.offsetParent)
   {
      while (obj.offsetParent)
      {
         curleft += obj.offsetLeft;
         obj = obj.offsetParent;
      }
   }
   else if (obj.x)
      curleft += obj.x;

   var obj = e;

   var curtop = 0;
   if (obj.offsetParent)
   {
      while (obj.offsetParent)
      {
         curtop += obj.offsetTop;
         obj = obj.offsetParent;
      }
   }
   else if (obj.y)
      curtop += obj.y;

   return {x:curleft, y:curtop};
};










// FADER PROTOTYPE _____________________________________________



if (typeof(_b.Fader) == "undefined")
   _b.Fader = {};





_b.Fader = function (ele, from, to, fadetime, callback)
{
   if (!ele)
      return 0;

   this.e = ele;

   this.from = from;
   this.to = to;

   this.cb = callback;

   this.nDur = fadetime;

   this.nInt = 50;
   this.nTime = 0;

   var p = this;
   this.nID = setInterval(function() { p._fade() }, this.nInt);
};




_b.Fader.prototype._fade = function()
{
   this.nTime += this.nInt;

   var ieop = Math.round( this._tween(this.nTime, this.from, this.to, this.nDur) * 100 );
   var op = ieop / 100;

   if (this.e.filters) // internet explorer
   {
      try
      {
         this.e.filters.item("DXImageTransform.Microsoft.Alpha").opacity = ieop;
      } catch (e) {
         // If it is not set initially, the browser will throw an error.  This will set it if it is not set yet.
         this.e.style.filter = 'progid:DXImageTransform.Microsoft.Alpha(opacity='+ieop+')';
      }
   }
   else // other browsers
   {
      this.e.style.opacity = op;
   }


   if (this.nTime == this.nDur)
   {
      clearInterval( this.nID );
      if (this.cb != undefined)
         this.cb();
   }
};



_b.Fader.prototype._tween = function(t,b,c,d)
{
   return b + ( (c-b) * (t/d) );
};