/**
    *  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) { var errMsg = 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);

        // create and populate ul
        //
        var ulss = _b.DOM.cE("ul", {});
        var span = _b.DOM.cE("span", { className: "msg" }, "", false);
        var small = _b.DOM.cE("small", {}, "Search Suggestions");
        span.appendChild(small);
        var li = _b.DOM.cE("li", { className: "msg" }, span);
        ulss.appendChild(li);

        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 html = "  (" + arr[i].info + ")";
            //            var small = _b.DOM.cE("small", {}, html);
            //            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(ulss);
        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);

        // 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.sInp = this.fld.value = this.aSug[this.iHigh - 1].value;

        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));
    };