function AutoSuggestControl(oTextbox,oProvider) {
    this.cur /*:int*/ = -1;
    this.layer = null;
    this.provider = oProvider;
    this.textbox = oTextbox;
    this.init();
}

AutoSuggestControl.prototype.autosuggest = function (aSuggestions, bTypeAhead) {
    if (aSuggestions.length > 0) {
        if (bTypeAhead) {
            setTimeout(function(){
                this.typeAhead(aSuggestions[0]);
            }, 250);           
        }
        this.showSuggestions(aSuggestions);
    } else {
        this.hideSuggestions();
    }
};

AutoSuggestControl.prototype.createDropDown = function () {
    var oThis = this;
    this.layer = document.createElement("div");
    this.layer.className = "suggestions";
    this.layer.style.visibility = "hidden";
    this.layer.style.width = this.textbox.offsetWidth;
    this.layer.onmousedown =
    this.layer.onmouseup =
    this.layer.onmouseover = function (oEvent) {
        oEvent = oEvent || window.event;
        oTarget = oEvent.target || oEvent.srcElement;
        if (oEvent.type == "mousedown") {
            oThis.textbox.value = oTarget.firstChild.nodeValue;
            oThis.hideSuggestions();
        } else if (oEvent.type == "mouseover") {
            oThis.highlightSuggestion(oTarget);
        } else {
            oThis.textbox.focus();
        }
    };
    document.body.appendChild(this.layer);
};

AutoSuggestControl.prototype.getLeft = function () {
    var oNode = this.textbox;
    var iLeft = 0;
    while(oNode.tagName != "BODY") {
        iLeft += oNode.offsetLeft;
        oNode = oNode.offsetParent;
    }
    return iLeft;
};

AutoSuggestControl.prototype.getTop = function () {
    var oNode = this.textbox;
    var iTop = 0;
    while(oNode.tagName != "BODY") {
        iTop += oNode.offsetTop;
        oNode = oNode.offsetParent;
    }
    return iTop;
};

AutoSuggestControl.prototype.handleKeyDown = function (oEvent) {

    switch(oEvent.keyCode) {
        case 38:
            this.previousSuggestion();
            break;
        case 40:
            this.nextSuggestion();
            break;
        case 13:
            this.hideSuggestions();
            break;
    }
};

AutoSuggestControl.prototype.handleKeyUp = function (oEvent) {

    var iKeyCode = oEvent.keyCode;
    if (iKeyCode == 8 || iKeyCode == 46) {
        this.provider.requestSuggestions(this, false);
    } else if (iKeyCode < 32 || (iKeyCode >= 33 && iKeyCode < 46) || (iKeyCode >= 112 && iKeyCode <= 123)) {
        //ignore
    } else {
        this.provider.requestSuggestions(this, true);
    }
};

AutoSuggestControl.prototype.hideSuggestions = function () {
    this.layer.style.visibility = "hidden";
};

AutoSuggestControl.prototype.highlightSuggestion = function (oSuggestionNode) {
    for (var i=0; i < this.layer.childNodes.length; i++) {
        var oNode = this.layer.childNodes[i];
        if (oNode == oSuggestionNode) {
            oNode.className = "current"
        } else if (oNode.className == "current") {
            oNode.className = "";
        }
    }
};

AutoSuggestControl.prototype.init = function () {
    var oThis = this;
    this.textbox.onkeyup = function (oEvent) {
        if (!oEvent) {
            oEvent = window.event;
        }
        oThis.handleKeyUp(oEvent);
    };
    this.textbox.onkeydown = function (oEvent) {
        if (!oEvent) {
            oEvent = window.event;
        }
        oThis.handleKeyDown(oEvent);
    };
    this.textbox.onblur = function () {
        oThis.hideSuggestions();
    };
    this.createDropDown();
};

AutoSuggestControl.prototype.nextSuggestion = function () {
    var cSuggestionNodes = this.layer.childNodes;
    if (cSuggestionNodes.length > 0 && this.cur < cSuggestionNodes.length-1) {
        var oNode = cSuggestionNodes[++this.cur];
        this.highlightSuggestion(oNode);
        this.textbox.value = oNode.firstChild.nodeValue;
    }
};

AutoSuggestControl.prototype.previousSuggestion = function () {
    var cSuggestionNodes = this.layer.childNodes;
    if (cSuggestionNodes.length > 0 && this.cur > 0) {
        var oNode = cSuggestionNodes[--this.cur];
        this.highlightSuggestion(oNode);
        this.textbox.value = oNode.firstChild.nodeValue;
    }
};

AutoSuggestControl.prototype.selectRange = function (iStart, iLength) {
    if (this.textbox.createTextRange) {
        var oRange = this.textbox.createTextRange();
        oRange.moveStart("character", iStart);
        oRange.moveEnd("character", iLength - this.textbox.value.length);
        oRange.select();
    } else if (this.textbox.setSelectionRange) {
        this.textbox.setSelectionRange(iStart, iLength);
    }
    this.textbox.focus();
};

AutoSuggestControl.prototype.showSuggestions = function (aSuggestions) {

    var oDiv = null;
    this.layer.innerHTML = "";

    for (var i=0; i < aSuggestions.length; i++) {
        oDiv = document.createElement("div");
        oDiv.appendChild(document.createTextNode(aSuggestions[i]));
        this.layer.appendChild(oDiv);
    }

    this.layer.style.left = this.getLeft() + "px";
    this.layer.style.top = (this.getTop()+this.textbox.offsetHeight) + "px";
    this.layer.style.visibility = "visible";

};

AutoSuggestControl.prototype.typeAhead = function (sSuggestion) {
    if (this.textbox.createTextRange || this.textbox.setSelectionRange){
        var iLen = this.textbox.value.length;
        ucwords(this.textbox.value) = sSuggestion;
        this.selectRange(iLen, sSuggestion.length);
    }
};