/**
*  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: 25000, delay: 500, offsety: -5, shownoresults: true, noresults: "No results!", maxheight: 250, cache: true, maxentries: 25, imagePattern: "$1" };
    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:
            bubble = this.setHighlightedValue();
            this.clearSuggestions();
            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 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 + ')');
        if (jsondata.results.length == 0) {
            this.clearSuggestions();
            return;
        }

        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, 'imageUrl': jsondata.results[i].imageUrl });
        }
    }
    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'), 'imageUrl': jsondata.results[i].imageUrl });
        }

    }


    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 });



    // create and populate ul
    //
    var ul = _b.DOM.cE("ul", { id: "as_ul" });
    ul.className = "plain-list";



    var limit = (arr.length > this.oP.maxentries) ? this.oP.maxentries : arr.length;

    // loop throught arr of suggestions
    // creating an LI element for each suggestion
    //
    for (var i = 0; i < limit; 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 small = _b.DOM.cE("small", {}, arr[i].info);
            span.appendChild(small);
        }

        if (arr[i].imageUrl != "") {
            var image = _b.DOM.cE("img", { 'src': this.oP.imagePattern.replace("$1", arr[i].imageUrl) });
        }

        var a = _b.DOM.cE("a", { href: this.oP.urlPattern.replace("$1", arr[i].id) });

        a.appendChild(image)

        /*
        // Removed because these spans are unnecessary and are causing styling issues.
        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 more = _b.DOM.cE("a", { className: "more-suggestions", href: "javascript:void(0)" }, "See more suggestions");

    var p = this;

    more.onclick = function () {
        $(p.fld).closest("form").submit();
    };

    more.onmouseover = function () {
        pointer.clearHighlight();
    }

    div.appendChild(more);



    // 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) {

        if (typeof (this.oP.callback) == "function") {
            this.oP.callback(this.aSug[this.iHigh - 1]);
        }

        window.location = _b.DOM.gE("as_ul").childNodes[this.iHigh - 1].childNodes[0].href;

        return false;
    }
    return 0;
};

_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 () {
    //return;
    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));
};

// jQuery wrapper
(function ($) {

    var AutoSuggest = function (element, autoSuggest) {
        var $element = $(element);
        this.instance = autoSuggest;
        // Attach the instance of this object
        // to the jQuery wrapped DOM node
        $element.data('AutoSuggest', this);
    }

    $.fn.autoSuggest = function (newOptions) {

        var options = { maxentries: 5, timeout: 7000, varname: "q", json: true, urlPattern: "/$1" }
        $.extend(options, newOptions);
        if (!this.attr("id")) {
            alert("Cannot perform suggestive search on a field without an ID. Library limitation.");
        }
        new AutoSuggest(this, new bsn.AutoSuggest(this.attr("id"), options));

    };
})(jQuery);