var singleton;

if (singleton) {
	if (typeof(_sugg) == "undefined")
		sugg = {}
	_sugg = sugg;
} else {
	_sugg = this;
}

if (typeof(_sugg.Autosuggest) == "undefined")
	_sugg.Autosuggest = {}

_sugg.AutoSuggest = function (fieldId, param)
{
	this.field = _sugg.DOM.getElement(fieldId);

	if (!this.field) return false;
	
	// init variables
	this.sInput 		= "";
	this.nInputChars 	= 0;
	this.aSuggestions 	= [];
	this.iHighlighted 	= 0;
	
	// parameters object
	this.oP = (param) ? param : {};
	
	// defaults	
	if (!this.oP.method)									this.oP.meth = "get";
	if (!this.oP.varname)									this.oP.varname = "input";
	if (!this.oP.className)									this.oP.className = "autosuggest";
	if (!this.oP.offsety)									this.oP.offsety = -5;
	if (!this.oP.noresults)									this.oP.noresults = "No results!";
	
	// set keyup handler for field
	// and prevent autocomplete from client
	var pointer = this;
	
	this.field.onkeypress 	= function(ev){ return pointer.onKeyPress(ev); }
	this.field.onkeyup 		= function(ev){ return pointer.onKeyUp(ev); }
	this.field.onblur 		= function(ev){ return pointer.onBlur(ev); }
	
	this.field.setAttribute("autocomplete","off");
}

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

	this.setHighlightedValue();
	if(document.getElementById(this.idAs) != null)
		document.getElementById(this.idAs).style.display = "none";

	return true;
}

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

	var RETURN = 13;
	var TAB = 9;
	var ESC = 27;
	
	var result = true;

	switch(key) {
		case RETURN:
			this.setHighlightedValue();
			result = false;
			break;
		case ESC:
			_sugg.DOM.removeElement(this.idAs);
			break;
	}

	return result;
}

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

	var ARRUP = 38;
	var ARRDN = 40;
	
	var result = true;

	switch(key) {
		case ARRUP:
			this.changeHighlight(key);
			this.setSelectionRange(this.field, this.field.value.length, this.field.value.length);
			result = false;
			break;
		case ARRDN:
			this.changeHighlight(key);
			result = false;
			break;
		default:
			this.getSuggestions(this.field.value);
	}

	return result;
}

_sugg.AutoSuggest.prototype.getSuggestions = function (val) {
	if (val == this.sInput)
		return false;
	
	var pos = val.indexOf( "," );
	this.sInput = val.substring(pos,this.sInput.length);
	this.nInputChars = val.length;

	this.doAjaxRequest();

	return false;
}

_sugg.AutoSuggest.prototype.doAjaxRequest = function () {
	
	var pointer = this;
	
	var url = this.oP.script+this.oP.varname+"="+escape(this.field.value);
	var meth = this.oP.meth;
	
	var onSuccessFunc = function (req) { pointer.setSuggestions(req) };
	var onErrorFunc = function (status) { };

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

_sugg.AutoSuggest.prototype.setSuggestions = function (req) {
	this.aSuggestions = [];

	var data = eval('(' + req.responseText + ')');
		
	for (var i=0;i<data.results.length;i++) {
		this.aSuggestions.push(  { 'id':data.results[i].id, 'value':data.results[i].value, 'info':data.results[i].info }  );
	}
	
	this.idAs = "as_"+this.field.id;
	this.createList(this.aSuggestions);
}

_sugg.AutoSuggest.prototype.createList = function(arr) {
	var pointer = this;
	
	// old list
	_sugg.DOM.removeElement(this.idAs);
	
	// create holding div
	var div = _sugg.DOM.createElement("div", {id:this.idAs, className:this.oP.className});	
	
	var hcorner = _sugg.DOM.createElement("div", {className:"as_corner"});
	var hbar = _sugg.DOM.createElement("div", {className:"as_bar"});
	var header = _sugg.DOM.createElement("div", {className:"as_header"});
	header.appendChild(hcorner);
	header.appendChild(hbar);
	div.appendChild(header);
	
	// create and populate ul
	var ul = _sugg.DOM.createElement("ul", {id:"as_ul"});
	
	// loop throught arr of suggestions
	// creating an LI element for each suggestion
	var inTemp = this.field.value.substring(this.field.value.lastIndexOf(",")+1, this.field.value.length);
	var pos = inTemp.replace(/^\s+/,"").length;
	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 output = "<em>" + val.substring(0, pos) + "</em>" + val.substring(pos);
		
		var span = _sugg.DOM.createElement("span", {}, output, true);
		if (arr[i].info != "")
		{
			var br = _sugg.DOM.createElement("br", {});
			span.appendChild(br);
			var small = _sugg.DOM.createElement("small", {}, arr[i].info);
			span.appendChild(small);
		}
		
		var a = _sugg.DOM.createElement("a", { href:"#" });
		
		var tl = _sugg.DOM.createElement("span", {className:"tl"}, " ");
		var tr = _sugg.DOM.createElement("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 = _sugg.DOM.createElement(  "li", {}, a  );
		ul.appendChild( li );
	}
	
	// no results
	if (arr.length == 0) {
		var li = _sugg.DOM.createElement(  "li", {className:"as_warning"}, this.oP.noresults  );
		ul.appendChild( li );
	}
	
	div.appendChild( ul );
	
	var fcorner = _sugg.DOM.createElement("div", {className:"as_corner"});
	var fbar = _sugg.DOM.createElement("div", {className:"as_bar"});
	var footer = _sugg.DOM.createElement("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 = _sugg.DOM.getPos(this.field);
	
	div.style.left 		= pos.x + "px";
	div.style.top 		= ( pos.y + this.field.offsetHeight + this.oP.offsety ) + "px";
	div.style.width 	= this.field.offsetWidth + "px";
	
	// add DIV to document
	document.getElementsByTagName("body")[0].appendChild(div);
	
	// currently no item is highlighted
	this.iHighlighted = 0;
}

_sugg.AutoSuggest.prototype.changeHighlight = function(key) {	
	var list = _sugg.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);
}

_sugg.AutoSuggest.prototype.setHighlight = function(n) {
	var list = _sugg.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";
}

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

_sugg.AutoSuggest.prototype.setHighlightedValue = function () {
	if (this.iHighlighted) {
		var pos = this.field.value.lastIndexOf(",");
		if(pos > 0) {
			this.field.value = this.field.value.substring(0,pos) + ", " + this.aSuggestions[ this.iHighlighted-1 ].value;
		} else {
			this.field.value = this.aSuggestions[ this.iHighlighted-1 ].value;
		}
		this.sInput = this.aSuggestions[ this.iHighlighted-1 ].value;
		
		// move cursor to end of input (safari)
		this.setSelectionRange(this.field, this.field.value.length, this.field.value.length);

		_sugg.DOM.removeElement(this.idAs);
	}
}

_sugg.AutoSuggest.prototype.setSelectionRange = function setSelectionRange(input, selectionStart, selectionEnd) {
    if (input.setSelectionRange) {
        input.focus();
        input.setSelectionRange(selectionStart, selectionEnd);
    }
    else if (input.createTextRange) {
        var range = input.createTextRange();
        range.collapse(true);
        range.moveEnd('character', selectionEnd);
        range.moveStart('character', selectionStart);
        range.select();
    }
}

// AJAX PROTOTYPE
if (typeof(_sugg.Ajax) == "undefined")
	_sugg.Ajax = {}

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

_sugg.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();
		}
	}
}

_sugg.Ajax.prototype.processReqChange = function() {
	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(_sugg.DOM) == "undefined")
	_sugg.DOM = {}

_sugg.DOM.createElement = function ( type, attr, cont, html ) {
	var elem = document.createElement( type );
	if (!elem) return false;

	for (var a in attr)
		elem[a] = attr[a];
		
	if (typeof(cont) == "string" && !html)
		elem.appendChild( document.createTextNode(cont) );
	else if (typeof(cont) == "string" && html)
		elem.innerHTML = cont;
	else if (typeof(cont) == "object")
		elem.appendChild( cont );

	return elem;
}

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

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

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

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

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

_sugg.DOM.getPos = function ( elem ) {
	var elem = this.getElement(elem);

	var obj = elem;

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

	var obj = elem;
	
	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}
}