var pSuggestions = null;
var image = new Array(1);

/**
 * An autosuggest textbox control.
 * @class
 * @scope public
 */
function AutoSuggestControl(oTextbox /*:HTMLInputElement*/,
    oProvider /*:SuggestionProvider*/, oUrl, oSuggestName, animSrc) {

    //alert(animSrc);
    /**
     * The currently selected suggestions.
     * @scope private
     */
    this.cur /*:int*/ = -1;

    /**
     * The dropdown list layer.
     * @scope private
     */
    this.layer = null;
    
    
    this.pLayer = null;

	this.pUrl = oUrl;

	this.pSuggestName = oSuggestName;

	image[0] = new Image();
	image[0].src = animSrc;
	image[0].width = "20";
	image[0].height = "18";
	

	


    /**
     * Suggestion provider for the autosuggest feature.
     * @scope private.
     */
    this.provider /*:SuggestionProvider*/ = oProvider;

    /**
     * The textbox to capture.
     * @scope private
     */
    this.textbox /*:HTMLInputElement*/ = oTextbox;

    /**
     * Timeout ID for fast typers.
     * @scope private
     */
    this.timeoutId /*:int*/ = null;

    /**
     * The text that the user typed.
     * @scope private
     */
    this.userText /*:String*/ = oTextbox.value;

    //initialize the control
    this.init();

}

/**
 * Autosuggests one or more suggestions for what the user has typed.
 * If no suggestions are passed in, then no autosuggest occurs.
 * @scope private
 * @param aSuggestions An array of suggestion strings.
 * @param bTypeAhead If the control should provide a type ahead suggestion.
 */
AutoSuggestControl.prototype.autosuggest = function (aSuggestions /*:Array*/,
    bTypeAhead /*:boolean*/) {

    //re-initialize pointer to current suggestion
    this.cur = -1;

    //make sure there's at least one suggestion
    if (aSuggestions != null && aSuggestions.length > 0 && aSuggestions[0].length > 1) {
        this.pSuggestions = aSuggestions;
        if (bTypeAhead) {
            this.typeAhead(aSuggestions[0]);
        }
		//alert(aSuggestions);
        this.showSuggestions(aSuggestions);
    } else {
        this.hideSuggestions();
    }
};

/**
 * Creates the dropdown layer to display multiple suggestions.
 * @scope private
 */
AutoSuggestControl.prototype.createDropDown = function () {

//create the layer and assign styles
    this.pLayer = document.createElement("div");
    this.pLayer.className = "processing";
    this.pLayer.style.visibility = "hidden";
    this.pLayer.style.width = image[0].width + "px";
    document.body.appendChild(this.pLayer);

    //create the layer and assign styles
    this.layer = document.createElement("div");
    this.layer.className = "suggestions";
    this.layer.style.visibility = "hidden";
    this.layer.style.width = this.textbox.offsetWidth + "px";
    document.body.appendChild(this.layer);

    //when the user clicks on the a suggestion, get the text (innerHTML)
    //and place it into a textbox
    var oThis = this;

	document.body.onresize = function(oEvent){
		//alert("onresize");
		oThis.hideSuggestions();
		oThis.textbox.focus();
	};

    this.layer.onmousedown =
    this.layer.onmouseup =

    this.layer.onmouseover = function (oEvent) {
        oEvent = oEvent || window.event;
        oTarget = oEvent.target || oEvent.srcElement;

        if (oEvent.type == "mousedown") {  
            if(!oTarget.id) 
				oTarget = oTarget.parentNode;
            oThis.cur = oTarget.getAttribute("id"); 
			if (oThis.pSuggestions[oThis.cur]){
				oThis.textbox.value = oThis.pSuggestions[oThis.cur]; //oTarget.firstChild.nodeValue;
			}
            oThis.hideSuggestions();			
			oThis.textbox.focus();
			oEvent.returnValue = false;
	        if (oEvent.preventDefault) {
		        oEvent.preventDefault();
			}
        } else if (oEvent.type == "mouseover") {
            oThis.highlightSuggestion(oTarget);
			oThis.textbox.focus();			
        } else {
            oThis.textbox.focus();
        }		
    };
};

/**
 * Gets the left coordinate of the textbox.
 * @scope private
 * @return The left coordinate of the textbox in pixels.
 */
AutoSuggestControl.prototype.getLeft = function () /*:int*/ {

    var oNode = this.textbox;

    var iLeft = 0;

   /* while(oNode.tagName != "BODY") {
        iLeft += oNode.offsetLeft;
        oNode = oNode.offsetParent;
    }*/

	if (oNode.offsetParent) {
		do {
			iLeft += oNode.offsetLeft;
		} while (oNode = oNode.offsetParent);
	}else{
		alert("offset parent is not supported");
	}
	
    return iLeft;
};



/**
 * Gets the top coordinate of the textbox.
 * @scope private
 * @return The top coordinate of the textbox in pixels.
 */
AutoSuggestControl.prototype.getTop = function () /*:int*/ {

    var oNode = this.textbox;
    var iTop = 0;

    /*while(oNode.tagName != "BODY") {
        iTop += oNode.offsetTop;
        oNode = oNode.offsetParent;
    }*/
	
	if (oNode.offsetParent) {
		do {
			iTop += oNode.offsetTop;
		} while (oNode = oNode.offsetParent);
	}else{
		alert("offset parent is not supported");
	}
    return iTop;
};

/**
 * Highlights the next or previous suggestion in the dropdown and
 * places the suggestion into the textbox.
 * @param iDiff Either a positive or negative number indicating whether
 *              to select the next or previous sugggestion, respectively.
 * @scope private
 */
AutoSuggestControl.prototype.goToSuggestion = function (iDiff /*:int*/) {
    var cSuggestionNodes = this.layer.childNodes;
	
	if (cSuggestionNodes.length > 0) {
        var oNode = null;

        if (iDiff > 0) {
            if (this.cur < cSuggestionNodes.length-1) {
                oNode = cSuggestionNodes[++this.cur];
            }
        } else {
            if (this.cur > 0) {
                oNode = cSuggestionNodes[--this.cur];
            }
        }

        if (oNode) {
            this.highlightSuggestion(oNode);
            if(!oNode.id) oNode = oNode.parentNode;
            this.cur = oNode.getAttribute("id");
			if (this.pSuggestions[this.cur]){
				this.textbox.value = this.pSuggestions[this.cur];
			}
			this.textbox.focus();
        }
    }
};

/**
 * Handles three keydown events.
 * @scope private
 * @param oEvent The event object for the keydown event.
 */
AutoSuggestControl.prototype.handleKeyDown = function (oEvent /*:Event*/) {
	//alert("key down");

    switch(oEvent.keyCode) {
        case 38: //up arrow
            this.goToSuggestion(-1);
            break;
        case 40: //down arrow
            this.goToSuggestion(1);
            break;
        case 27: //esc
            this.textbox.value = this.userText;
			this.textbox.focus();
			this.selectRange(this.userText.length, 0);
        /* falls through */
        case 13: //enter
			if (this.layer.style.visibility == "visible")
			{
				this.hideSuggestions();
				oEvent.returnValue = false;
	            if (oEvent.preventDefault) {
		            oEvent.preventDefault();
			    }
			}   
            break;
    }
};

/**
 * Handles keyup events.
 * @scope private
 * @param oEvent The event object for the keyup event.
 */
AutoSuggestControl.prototype.handleKeyUp = function (oEvent /*:Event*/) {

    var iKeyCode = oEvent.keyCode;
    var oThis = this;

    //get the currently entered text
    this.userText = this.textbox.value;

    clearTimeout(this.timeoutId);

    //for backspace (8) and delete (46), shows suggestions without typeahead
    if (iKeyCode == 8 || iKeyCode == 46) {

        this.timeoutId = setTimeout( function () {
            this.pSuggestions = null;
            oThis.provider.requestSuggestions(oThis, false);
        }, 0);

    //make sure not to interfere with non-character keys
    } else if (iKeyCode < 32 || (iKeyCode >= 33 && iKeyCode < 46) || (iKeyCode >= 112 && iKeyCode <= 123)) {
    //ignore
    } else {
        //request suggestions from the suggestion provider with typeahead
        this.timeoutId = setTimeout( function () {
            this.pSuggestions = null;
            oThis.provider.requestSuggestions(oThis, true);
        }, 0);
    }
};

/**
 * Hides the suggestion dropdown.
 * @scope private
 */
AutoSuggestControl.prototype.hideSuggestions = function () {
    this.layer.style.visibility = "hidden";
    this.pLayer.style.visibility = "hidden";
};

/**
 * Highlights the given node in the suggestions dropdown.
 * @scope private
 * @param oSuggestionNode The node representing a suggestion in the dropdown.
 */
AutoSuggestControl.prototype.highlightSuggestion = function (oSuggestionNode) {
	//alert(oSuggestionNode.innerHTML);
    for (var i=0; i < this.layer.childNodes.length; i++) {		
        var oNode = this.layer.childNodes[i];
		//alert(oNode.innerHTML);
        if (oNode == oSuggestionNode) {	
			//alert("current");
			oNode.className = "current"
        } else if (oNode.className == "current") {
            oNode.className = "";
        }
    }
};

/**
 * Initializes the textbox with event handlers for
 * auto suggest functionality.
 * @scope private
 */
AutoSuggestControl.prototype.init = function () {

    //save a reference to this object
    var oThis = this;

    //assign the onkeyup event handler
    this.textbox.onkeyup = function (oEvent) {

        //check for the proper location of the event object
        if (!oEvent) {
            oEvent = window.event;
        }

        //call the handleKeyUp() method with the event object
        oThis.handleKeyUp(oEvent);
    };

    //assign onkeydown event handler
    this.textbox.onkeydown = function (oEvent) {

        //check for the proper location of the event object
        if (!oEvent) {
            oEvent = window.event;
        }

        //call the handleKeyDown() method with the event object
        oThis.handleKeyDown(oEvent);
    };

    //assign onblur event handler (hides suggestions)
    this.textbox.onblur = function () {
        oThis.hideSuggestions();		
		handleTextBoxBlur(oThis.textbox);
    };

    //create the suggestions dropdown
    this.createDropDown();
};

/**
 * Selects a range of text in the textbox.
 * @scope public
 * @param iStart The start index (base 0) of the selection.
 * @param iEnd The end index of the selection.
 */
AutoSuggestControl.prototype.selectRange = function (iStart /*:int*/, iEnd /*:int*/) {

    //use text ranges for Internet Explorer
	if (this.textbox.createTextRange) {
        var oRange = this.textbox.createTextRange();
        oRange.moveStart("character", iStart);
        oRange.moveEnd("character", iEnd - this.textbox.value.length);
        oRange.select();

    //use setSelectionRange() for Mozilla
    } else if (this.textbox.setSelectionRange) {
        this.textbox.setSelectionRange(iStart, iEnd);
    }

    //set focus back to the textbox
    this.textbox.focus();
};

/**
 * Builds the suggestion layer contents, moves it into position,
 * and displays the layer.
 * @scope private
 * @param aSuggestions An array of suggestions for the control.
 */
AutoSuggestControl.prototype.showSuggestions = function (aSuggestions /*:Array*/) {

    var oDiv = null;
    var ut = null;
    var bt = null;
   
    this.layer.innerHTML = "";  //clear contents of the layer
    
    for (var i=0; i < aSuggestions.length; i++) {
        aSuggestions[i] = aSuggestions[i].replace(/^\s*/, "").replace(/\s*$/, "");
		if(aSuggestions[i].length > 1){
            oDiv = document.createElement("div");
            oDiv.setAttribute("id", i);
			oDiv.innerHTML =  aSuggestions[i];
			this.layer.appendChild(oDiv);            
        }
       
    }

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

    this.pLayer.style.visibility = "hidden";
    this.layer.style.visibility = "visible";

};

AutoSuggestControl.prototype.showProcessing = function (show) {
    if(show == true){
      var oDiv = null;
      this.pLayer.innerHTML = "";  //clear contents of the pLayer

      this.pLayer.appendChild(image[0]);

	  this.pLayer.style.left = (this.getLeft()  + this.textbox.offsetWidth - image[0].width - 4) + "px";
      this.pLayer.style.top = (this.getTop()+2) + "px";
     
      this.pLayer.style.visibility = "visible";
    }

};
/**
 * Inserts a suggestion into the textbox, highlighting the
 * suggested part of the text.
 * @scope private
 * @param sSuggestion The suggestion for the textbox.
 */
AutoSuggestControl.prototype.typeAhead = function (sSuggestion /*:String*/) {
	//check for support of typeahead functionality
    if (this.textbox.createTextRange || this.textbox.setSelectionRange){
        var iLen = this.textbox.value.length;
		if (sSuggestion){
			this.textbox.value = sSuggestion;
		} 
		this.textbox.focus();
        this.selectRange(iLen, sSuggestion.length);
    }
};

/**
 * Provides suggestions for state/province names.
 * @class
 * @scope public
 */
function SuggestionProvider() {
    if (window.XMLHttpRequest) {
        xmlhttp = new XMLHttpRequest();
    } else if (window.ActiveXObject) {
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
    this.http = xmlhttp;
}

/**
 * Request suggestions for the given autosuggest control.
 * @scope protected
 * @param oAutoSuggestControl The autosuggest control to provide suggestions for.
 */
SuggestionProvider.prototype.requestSuggestions = function (oAutoSuggestControl /*:AutoSuggestControl*/,
    bTypeAhead /*:boolean*/) {

    var oHttp = this.http;

    //cancel any active requests
    if (oHttp.readyState != 0) {
        oHttp.abort();
    }
    if(oAutoSuggestControl.userText.length <= 0){
        oAutoSuggestControl.hideSuggestions();
        return;
    }
    oAutoSuggestControl.showProcessing(true);
    //open connection to server
    
	var query = oAutoSuggestControl.pUrl+"?REQTYPE=suggestive&SUGGESTNAME="+oAutoSuggestControl.pSuggestName+"&SUGGESTINPUT=" + oAutoSuggestControl.userText;

	oHttp.open("GET", query, true);
    
	oHttp.onreadystatechange = function () {
        if (oHttp.readyState == 4) {
            if (oHttp.status == 200) {
				//alert(oHttp.responseText);
                var message = oHttp.responseText;
                message = message.replace(/^\s*/, "").replace(/\s*$/, "");
                
                var aSuggestions;
                if(message.length == 0){
                    aSuggestions = null;
                }else{
                    aSuggestions = message.split(";");
                }
				//alert(aSuggestions);
                //provide suggestions to the control
				//alert(aSuggestions);
                oAutoSuggestControl.autosuggest(aSuggestions, false);
            }
        }
        
    };
    //send the request
    oHttp.send(null);
};