/**
 *  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) {
        /*alert("AJAX error: " + 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 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 words = this.sInp.split(" ");
        var output = val;
        var info = arr[i].info;
        for (var key = 0; key < words.length; key++) {
            var st = output.toLowerCase().indexOf(words[key].toLowerCase());
            if(st !== -1){
                output = output.substring(0, st) + "<em>" + output.substring(st, st + words[key].length) + "</em>" + output.substring(st + words[key].length);
            }
            if(info != ""){
                var st = info.toLowerCase().indexOf(words[key].toLowerCase());
                if(st !== -1){
                    info = info.substring(0, st) + "<em>" + info.substring(st, st + words[key].length) + "</em>" + info.substring(st + words[key].length);
                }
            }
        }
        /*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 output = val.split(this.sInp).join("<em>" + this.sInp + "</em>");*/

        /*var output = val;*/

        var span = _b.DOM.cE("span", {}, output, true);
        if (info != "") {
            var br = _b.DOM.cE("br", {});
            span.appendChild(br);
            var small = _b.DOM.cE("small", {}, info, true);
            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(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.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) );
};