var options_xml;
var as_xml;
var gullSearchXmlDoc;
	
function SetupXmlFunction()
{
    if( document.implementation.hasFeature("XPath", "3.0") )
	{
		XMLDocument.prototype.selectNodes = function(cXPathString, xNode)
		{
			if( !xNode ) { xNode = this; } 

			var oNSResolver = this.createNSResolver(this.documentElement)
			var aItems = this.evaluate(cXPathString, xNode, oNSResolver, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null)
			var aResult = [];
			for( var i = 0; i < aItems.snapshotLength; i++)
			{
				aResult[i] =  aItems.snapshotItem(i);
			}
			
			return aResult;
		}
		XMLDocument.prototype.selectSingleNode = function(cXPathString, xNode)
		{
			if( !xNode ) { xNode = this; } 

			var xItems = this.selectNodes(cXPathString, xNode);
			if( xItems.length > 0 )
			{
				return xItems[0];
			}
			else
			{
				return null;
			}
		}
		Element.prototype.selectNodes = function(cXPathString)
		{
			if(this.ownerDocument.selectNodes)
			{
				return this.ownerDocument.selectNodes(cXPathString, this);
			}
			else{throw "For XML Elements Only";}
		}
		Element.prototype.selectSingleNode = function(cXPathString)
		{	
			if(this.ownerDocument.selectSingleNode)
			{
				return this.ownerDocument.selectSingleNode(cXPathString, this);
			}
			else{throw "For XML Elements Only";}
		}
	}
}
	

function LoadXmlDoc()
{
    // code for Internet Explorer to load towns.xml 
    if (window.ActiveXObject)
    {
        gullSearchXmlDoc=new ActiveXObject("Microsoft.XMLDOM");
        gullSearchXmlDoc.async=false;
        gullSearchXmlDoc.setProperty('SelectionLanguage', 'XPath');
        gullSearchXmlDoc.load("results.xml");
        donothing();
    }
    // code for Mozilla, Firefox, Opera, etc. to load towns.xml
    else if (document.implementation && document.implementation.createDocument)
    {
        gullSearchXmlDoc=document.implementation.createDocument("","",null);
        gullSearchXmlDoc.load("results.xml");
        gullSearchXmlDoc.onload=donothing(); 
    }
    else
    {
        alert('Your browser cannot handle this script');
    }
}

function donothing()
{
}




/******************************************************************************************/
/*
    Based on Timothy Groves auto complete - http://www.brandspankingnew.net
*/


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;
			// this prevents the form being posted when enter key is pressed, when a location is selected 
			// from the auto complete. in IE7
			return !(window.event && window.event.keyCode == 13);
			break;

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

	return bubble;
};



_b.AutoSuggest.prototype.onKeyUp = function(ev)
{
    if(Browser.Version() < 7)
	{
	    gullShowIE6DropDowns();
    }

	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;
	
		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
	
	var pointer = this;
	
	if (input != this.fld.value)
		return false;
	
	if (options_xml != null && options_xml != 'undefined')
	{
	    pointer.setSuggestions(options_xml, input)
	}
};



_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 = [];
	
	var xml = req;//.responseXML;

	// traverse xml
	var xPath = "//r[starts-with(.,'" + input.toLowerCase() + "')][position()<10]";
    var results = gullSearchXmlDoc.selectNodes(xPath); 		

	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 }  );
	}
	
	
	this.idAs = "as_"+this.fld.id;
	this.createList(this.aSug);
	
	if(Browser.Version() < 7)
	{
        gullHideIE6DropDowns(this.aSug.length);
    }
	
};


_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});	
	
	// 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);
		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 );
	
	// 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);
	
	//hide the drop downs for ie
};


_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 gullListArea = document.getElementById('as_gullTypedLocation');
    if (gullListArea)
	{
	    gullListArea.style.visibility = "hidden";
	    if(Browser.Version() < 7)
	    {
	        gullShowIE6DropDowns();
	    }
	}
    return false;
};



// 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};
};



function gullSetupAutoComplete()
{
    SetupXmlFunction();
    LoadXmlDoc();
	
	 options_xml = {
		script: function (input) { return "results.xml"; },
		varname:"input",
		callback: function (obj) { document.getElementById('hdnTypedSearch').value = obj.id; }
	};
	
	as_xml = new bsn.AutoSuggest('gullTypedLocation', options_xml);
}




function checkTypedLocation(input)
{
	// if the user fully types an area and doesnt select a location from the suggest dropdown
	// then the hidden field will be empty so, chech the location they typed and see is it has a location code.
	var xPath = "//r[starts-with(.,'" + input.toLowerCase() + "')][position()<10]";
    var results = gullSearchXmlDoc.selectNodes(xPath);
    
    if(results.length > 0)
    {
        return results[0].getAttribute('id')
    }
    else
    {
        //no match
        return '';
    }
};

var Browser = {
  Version: function() {
    var version = 999; // we assume a sane browser
    if (navigator.appVersion.indexOf("MSIE") != -1)
      // bah, IE again, lets downgrade version number
      version = parseFloat(navigator.appVersion.split("MSIE")[1]);
    return version;
  }
}