/**
 *  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 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); // DER 10/31/07 removed the header image
  
  
  
  
  // 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); // DER 10/31/07 removed the footer image
  
  
  
  // 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) );
};