/*******************************************************************************
* Ajaxový skript na automatické dokončování v textovém poli za pomocí JSON
*	
* 2008-11-04 Chaloupka Jaromír
* 2007-07-19 Groves Timothy - http://www.brandspankingnew.net
*******************************************************************************/

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

if (typeof(_b.Autosuggest) == "undefined") {
	_b.Autosuggest = {};
} else {
	alert("Automatické dokončování je nastaveno!");
}

_b.AutoSuggest = function (id, param) {
	if (!document.getElementById) {
		return 0;
	}
	
	this.fld = _b.DOM.gE(id);

	if (!this.fld) {
		return 0;
	}
	
  // Nastavení proměnných
	this.sInp 	= "";
	this.nInpC 	= 0;
	this.aSug 	= [];
	this.iHigh 	= 0;	
	
	this.oP = param ? param : {};
	
	var k, def = {minchars:1, meth:"get", varname:"input", className:"autosuggest", timeout:2500, delay:500, offsety:-5, shownoresults: true, noresults: "Žádný výsledek!", maxheight: 250, cache: true, maxentries: 25};
	for (k in def) {
		if (typeof(this.oP[k]) != typeof(def[k])) {
			this.oP[k] = def[k];
		}
	}
	
	var p = this;
	
	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;

	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;

	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 (val == this.sInp) {
		return 0;
	}
	_b.DOM.remE(this.idAs);	
	
	this.sInp = val;	
	
	if (val.length < this.oP.minchars) {
		this.aSug = [];
		this.nInpC = val.length;
		return 0;
	}	
	
	var ol = this.nInpC;
	this.nInpC = val.length ? val.length : 0;

	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 {
		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) {
	if (input != this.fld.value) {
		return false;
	}
	
	var pointer = this;
	
	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 (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;
		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;

	_b.DOM.remE(this.idAs);
	this.killTimeout();	

	if (arr.length == 0 && !this.oP.shownoresults) {
		return false;
	}
	
	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);
	
	var ul = _b.DOM.cE("ul", {id:"as_ul"});

	for (var i=0; i<arr.length; i++) {
		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 );
	}

	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);
	
	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";
	
	div.onmouseover 	= function(){ pointer.killTimeout() };
	div.onmouseout 		= function(){ pointer.resetTimeout() };

	document.getElementsByTagName("body")[0].appendChild(div);

	this.iHigh = 0;

	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;
		this.fld.focus();
		if (this.fld.selectionStart) {
			this.fld.setSelectionRange(this.sInp.length, this.sInp.length);
		}
		this.clearSuggestions();
		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;
	
	if (window.XMLHttpRequest) {
		this.req = new XMLHttpRequest();
		this.req.onreadystatechange = function () { pointer.processReqChange() };
		this.req.open("GET", url, true); //
		this.req.send(null);
	}	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() {
	if (this.req.readyState == 4) {
		if (this.req.status == 200)	{
			this.onComplete( this.req );
		} else {
			this.onError( this.req.status );
		}
	}
};


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

_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;
};

_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;
	}
};

_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;
	}
};

_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) {
		try	{
			this.e.filters.item("DXImageTransform.Microsoft.Alpha").opacity = ieop;
		} catch (e) { 
			this.e.style.filter = 'progid:DXImageTransform.Microsoft.Alpha(opacity='+ieop+')';
		}
	}	else {
		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) );
};