/** Originally by:
 *  author:		Timothy Groves - http://www.brandspankingnew.net
 *	version:  2.0 - 2007-02-07
 * 
 *  Drastically simplified by: Gunther Schadow - Pragmatic Data LLC
 */
var useBSNns;

if (useBSNns) {
	if (typeof(bsn) == "undefined")
		bsn = {}
	_bsn = bsn;
} else {
	_bsn = this;
}

if(typeof(_bsn.Autocomplete) == "undefined")
	_bsn.Autocomplete = {}
	
_bsn.Autocomplete = function (fldID, param) {
	if (!document.getElementById) // no DOM - give up!
	   return false;  		
	this.fld = _bsn.DOM.getElement(fldID); // get field via DOM
	if (!this.fld)
	   return false;
	// init variables
	this.sInput 		= "";
	this.nInputChars 	= 0;
	this.aSuggestions 	= [];
	this.iHighlighted 	= 0;
	
	// parameters object
	this.oP = (param) ? param : {};
	// defaults	
	if (!this.oP.minchars)	this.oP.minchars = 2;
	if (!this.oP.method)		this.oP.meth = "get";
	if (!this.oP.varname)		this.oP.varname = "input";
	if (!this.oP.className)	this.oP.className = "autocomplete";
	if (!this.oP.timeout)		this.oP.timeout = 2500;
	if (!this.oP.delay)			this.oP.delay = 500;
	if (!this.oP.offsety)		this.oP.offsety = 0;
	if (!this.oP.maxheight && this.oP.maxheight !== 0)	this.oP.maxheight = 250;
	if (!this.oP.cache && this.oP.cache != false)	this.oP.cache = true;
	
	// set keyup handler for field
	// and prevent autocomplete from client
	var pointer = this;
	
	// NOTE: not using addEventListener because UpArrow fired twice in Safari
	//_bsn.DOM.addEvent( this.fld, 'keyup', function(ev){ return pointer.onKeyPress(ev); } );
	
	this.fld.onkeypress 	= function(ev){ return pointer.onKeyPress(ev); }
	this.fld.onkeyup 	= function(ev){ return pointer.onKeyUp(ev); }
	this.fld.setAttribute("autocomplete","off");
}
	
_bsn.Autocomplete.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 = true;
	
	switch(key) {
	case RETURN:
		this.setHighlightedValue();
		bubble = true; // making sure that return key will engage
		break;
		
	case ESC:
		this.clearSuggestions();
		break;
	}

	return bubble;
}

_bsn.Autocomplete.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 = true;

	switch(key) {
	case ARRUP:
		this.changeHighlight(key);
		bubble = false;
		break;
		
	case ARRDN:
		this.changeHighlight(key);
		bubble = false;
		break;
		
	default:
		this.getSuggestions(this.fld.value);
	}
	
	return bubble;
}

_bsn.Autocomplete.prototype.getSuggestions = function (val) {
	// if input stays the same, do nothing
	if (val == this.sInput)
		return false;
	
	// input length is less than the min required to trigger a request
	// reset input string
	// do nothing
	if (val.length < this.oP.minchars) {
		this.sInput = "";
		return false;
	}
	
	// if caching enabled, and user is typing (ie. length of input is increasing)
	// filter results out of aSuggestions from last request
	if (val.length > this.nInputChars && this.aSuggestions.length && this.oP.cache) {
		var arr = [];
		for (var i=0;i<this.aSuggestions.length;i++) {
			if (this.aSuggestions[i].value.substr(0,val.length).toLowerCase() == val.toLowerCase())
				arr.push( this.aSuggestions[i] );
		}
		
		this.sInput = val;
		this.nInputChars = val.length;
		this.aSuggestions = arr;
		this.createList(this.aSuggestions);
		return false;

	} else { 	// do new request
		this.sInput = val;
		this.nInputChars = val.length;
		var pointer = this;
		clearTimeout(this.ajID);
		this.ajID = setTimeout( function() { pointer.doAjaxRequest() }, this.oP.delay );
	}

	return false;
}

_bsn.Autocomplete.prototype.doAjaxRequest = function () {
	var pointer = this;
	// create ajax request
	var value = this.fld.value;
	if(value.length < this.oP.minchars)
		return false; 
	// checked this one more time because when user quickly hits backspace, 
	// we can pass by the earlier check
	var url = this.oP.script+this.oP.varname+"="+escape(value);
	var meth = this.oP.meth;
	var onSuccessFunc = function (req) { pointer.setSuggestions(req) };
	// var onErrorFunc = function (status) { alert("AJAX error: "+status); };
	var onErrorFunc = function (status) { };
	var myAjax = new _bsn.Ajax();
	// window.status = window.status + " req: " + url;
	myAjax.makeRequest( url, meth, onSuccessFunc, onErrorFunc );
}

_bsn.Autocomplete.prototype.setSuggestions = function (req) {
	this.aSuggestions = [];
	var xml = req.responseXML;
	var results = xml.getElementsByTagName('results')[0].childNodes;
	for (var i=0;i<results.length;i++) {
		if (results[i].hasChildNodes())
			this.aSuggestions.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.aSuggestions);
}

_bsn.Autocomplete.prototype.createList = function(arr) {
	var pointer = this;
	
	// get rid of old list
	// and clear the list removal timeout
	_bsn.DOM.removeElement(this.idAs);
	this.killTimeout();
	
	// create holding div
	var div = _bsn.DOM.createElement("div", {id:this.idAs, className:this.oP.className});	
	
	// create and populate ul
	var ul = _bsn.DOM.createElement("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.sInput.toLowerCase() );
		var output = val.substring(0,st) + "<em>" + val.substring(st, st+this.sInput.length) + "</em>" + val.substring(st+this.sInput.length);
		var span = _bsn.DOM.createElement("span", {}, output, true);

		if (arr[i].info != "") {
			var br = _bsn.DOM.createElement("br", {});
			span.appendChild(br);
			var small	= _bsn.DOM.createElement("small", {}, arr[i].info);
			span.appendChild(small);
		}
		
		var a  = _bsn.DOM.createElement("a", { href:"#" });
		//a.appendChild(_bsn.DOM.createElement("span", {className:"tl"}, " "));
		//a.appendChild(_bsn.DOM.createElement("span", {className:"tr"}, " "));
		a.appendChild(span);
		a.name = i+1;
		a.onclick = function () { pointer.setHighlightedValue(); return false; }
		a.onmouseover = function () { pointer.setHighlight(this.name); }
		
		var li = _bsn.DOM.createElement(  "li", {}, a  );
		
		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 = _bsn.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.iHighlighted = 0;
	
	// remove list after an interval
	var pointer = this;
	this.toID = setTimeout(function () { pointer.clearSuggestions() }, this.oP.timeout);
}

_bsn.Autocomplete.prototype.changeHighlight = function(key) {	
	var list = _bsn.DOM.getElement("as_ul");
	if (!list)
		return false;

	var n;

	if (key == 40)
		n = this.iHighlighted + 1;
	else if (key == 38)
		n = this.iHighlighted - 1;
	
	if (n > list.childNodes.length)
		n = list.childNodes.length;
	if (n < 1)
		n = 1;

	this.setHighlight(n);
}

_bsn.Autocomplete.prototype.setHighlight = function(n) {
	var list = _bsn.DOM.getElement("as_ul");
	if (!list)
		return false;
	
	if (this.iHighlighted > 0)
		this.clearHighlight();
	
	this.iHighlighted = Number(n);
	
	list.childNodes[this.iHighlighted-1].className = "as_highlight";

	this.killTimeout();
}

_bsn.Autocomplete.prototype.clearHighlight = function() {
	var list = _bsn.DOM.getElement("as_ul");
	if (!list)
		return false;
	
	if (this.iHighlighted > 0) {
		list.childNodes[this.iHighlighted-1].className = "";
		this.iHighlighted = 0;
	}
}

_bsn.Autocomplete.prototype.setHighlightedValue = function () {
	if (this.iHighlighted) {
		this.sInput = this.fld.value = this.aSuggestions[ this.iHighlighted-1 ].value;
		
		// move cursor to end of input (safari)
		this.fld.focus();
		if (this.fld.selectionStart)
			this.fld.setSelectionRange(this.sInput.length, this.sInput.length);

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

_bsn.Autocomplete.prototype.killTimeout = function() {
	clearTimeout(this.toID);
}

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

_bsn.Autocomplete.prototype.clearSuggestions = function () {
	this.killTimeout();
	var ele = _bsn.DOM.getElement(this.idAs);
	var pointer = this;
	if (ele) {
		// var fade = new _bsn.Fader(ele,1,0,250,function () { }
		_bsn.DOM.removeElement(pointer.idAs);
	}
}

// AJAX PROTOTYPE _____________________________________________

if (typeof(_bsn.Ajax) == "undefined")
	_bsn.Ajax = {}

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

_bsn.Ajax.prototype.makeRequest = function (url, meth, onComp, onErr) {
	if (meth != "POST")
		meth = "GET";
	
	this.onComplete = onComp;
	this.onError = onErr;
	
	var pointer = this;
	
	if (window.XMLHttpRequest) { // for native XMLHttpRequest object
		this.req = new XMLHttpRequest();
		this.req.onreadystatechange = function () { pointer.processReqChange() };
		this.req.open("GET", url, true); //
		this.req.send(null);
	}	else if (window.ActiveXObject) { // for IE/Windows ActiveX version
		this.req = new ActiveXObject("Microsoft.XMLHTTP");
		if (this.req)	{
			this.req.onreadystatechange = function () { pointer.processReqChange() };
			this.req.open(meth, url, true);
			this.req.send();
		}
	}
}

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

// DOM PROTOTYPE _____________________________________________

if (typeof(_bsn.DOM) == "undefined")
	_bsn.DOM = {}

_bsn.DOM.createElement = function ( type, attr, cont, html ) {
	var ne = document.createElement( type );
	if (!ne)
		return false;
		
	for (var a in attr)
		ne[a] = attr[a];
		
	if (typeof(cont) == "string" && !html)
		ne.appendChild( document.createTextNode(cont) );
	else if (typeof(cont) == "string" && html)
		ne.innerHTML = cont;
	else if (typeof(cont) == "object")
		ne.appendChild( cont );

	return ne;
}

_bsn.DOM.clearElement = function ( id ) {
	var ele = this.getElement( id );
	if (!ele)
		return false;
	while (ele.childNodes.length)
		ele.removeChild( ele.childNodes[0] );
	return true;
}

_bsn.DOM.removeElement = function ( ele ) {
	var e = this.getElement(ele);
	if (!e)
		return false;
	else if (e.parentNode.removeChild(e))
		return true;
	else
		return false;
}

_bsn.DOM.replaceContent = function ( id, cont, html ) {
	var ele = this.getElement( id );
	if (!ele)
		return false;
	this.clearElement( ele );
	if (typeof(cont) == "string" && !html)
		ele.appendChild( document.createTextNode(cont) );
	else if (typeof(cont) == "string" && html)
		ele.innerHTML = cont;
	else if (typeof(cont) == "object")
		ele.appendChild( cont );
}

_bsn.DOM.getElement = function ( ele ) {
	if (typeof(ele) == "undefined")	{
		return false;
	} else if (typeof(ele) == "string")	{
		var re = document.getElementById( ele );
		if (!re)
			return false;
		else if (typeof(re.appendChild) != "undefined" ) {
			return re;
		} else {
			return false;
		}
	}	else if (typeof(ele.appendChild) != "undefined")
		return ele;
	else
		return false;
}

_bsn.DOM.appendChildren = function ( id, arr ) {
	var ele = this.getElement( id );
	if (!ele)
		return false;
	if (typeof(arr) != "object")
		return false;
	for (var i=0;i<arr.length;i++){
		var cont = arr[i];
		if (typeof(cont) == "string")
			ele.appendChild( document.createTextNode(cont) );
		else if (typeof(cont) == "object")
			ele.appendChild( cont );
	}
}

_bsn.DOM.getPos = function ( ele ) {
	var ele = this.getElement(ele);
	var obj = ele;
	var curleft = 0;
	if (obj.offsetParent)	{
		while (obj.offsetParent) {
			curleft += obj.offsetLeft
			obj = obj.offsetParent;
		}
	}
	else if (obj.x)
		curleft += obj.x;

	var obj = ele;
	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}
}