/**
 * An autosuggest textbox control.
 * @class
 * @scope public
 */
function AutoSuggestControl(oTextbox /*:HTMLInputElement*/, 
                            oProvider /*:SuggestionProvider*/) {
    
    /**
     * The currently selected suggestions.
     * @scope private
     */   
    this.cur /*:int*/ = -1;

    /**
     * The dropdown list layer.
     * @scope private
     */
    this.layer = null;
    
    /**
     * Suggestion provider for the autosuggest feature.
     * @scope private.
     */
    this.provider /*:SuggestionProvider*/ = oProvider;
    
    /**
     * The textbox to capture.
     * @scope private
     */
    this.textbox /*:HTMLInputElement*/ = oTextbox;
    
    //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*/) {
    
    //make sure there's at least one suggestion
    if (aSuggestions.length > 0) {
        if (bTypeAhead) {
           this.typeAhead(aSuggestions[0]);
        }
        
        this.showSuggestions(aSuggestions);
    } else {
        this.hideSuggestions();
    }
};

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

    var oThis = this;

    //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;
	//this.layer.style.width = '400px';
    
    //when the user clicks on the a suggestion, get the text (innerHTML)
    //and place it into a textbox
    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;
			//alert(oTarget.childNodes[1].nodeValue);
			oThis.textbox.value = oTarget.childNodes[1].nodeValue;
            oThis.hideSuggestions();
        } else if (oEvent.type == "mouseover") {
            oThis.highlightSuggestion(oTarget);
        } else {
            oThis.textbox.focus();
        }
    };
    
    
    document.body.appendChild(this.layer);
};

/**
 * 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;        
    }
    
    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;
    }
    
    return iTop;
};

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

    switch(oEvent.keyCode) {
        case 38: //up arrow
            this.previousSuggestion();
            break;
        case 40: //down arrow 
            this.nextSuggestion();
            break;
        case 13: //enter
            this.hideSuggestions();
            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;

    //for backspace (8) and delete (46), shows suggestions without typeahead
    if (iKeyCode == 8 || iKeyCode == 46) {
        this.provider.requestSuggestions(this, false);
        
    //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.provider.requestSuggestions(this, false);
    }
};

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

/**
 * 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;
    if(this.textbox != null){
		
		//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();
		};
		
		//create the suggestions dropdown
		this.createDropDown();
		
	}
};

/**
 * Highlights the next suggestion in the dropdown and
 * places the suggestion into the textbox.
 * @scope private
 */
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; 
		this.textbox.value = oNode.childNodes[1].nodeValue;
    }
};

/**
 * Highlights the previous suggestion in the dropdown and
 * places the suggestion into the textbox.
 * @scope private
 */
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;   
		this.textbox.value = oNode.childNodes[1].nodeValue;
    }
};

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

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

    //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 strDivContents = "";
	
    var oDiv = null;
    this.layer.innerHTML = "";  //clear contents of the layer
    
    for (var i=0; i < aSuggestions.length; i = i + 2) {
		var newimg = document.createElement('img');
		newimg.src = '/images/icons/flags/iso/gif/' + aSuggestions[i+1] + '.gif';
		//newimg.alt=previewalternative;
		//newimg.className=previewimageclass;
		//newa.appendChild(newimg);
		newimg.hspace = '8';
		newimg.vspace = '6';
		newimg.align = 'absmiddle';
		strDivContents = aSuggestions[i];
        oDiv = document.createElement("div");
        oDiv.appendChild(newimg);
		oDiv.appendChild(document.createTextNode(strDivContents));
        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";

};

/**
 * 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; 
        this.textbox.value = sSuggestion; 
        this.selectRange(iLen, sSuggestion.length);
    }
};


/**
 * Provides suggestions for state names (USA).
 * @class
 * @scope public
 */
function StateSuggestions() {
    this.states = [
        "Alabama", "Alaska", "Arizona", "Arkansas",
        "California", "Colorado", "Connecticut",
        "Delaware", "Florida", "Georgia", "Hawaii",
        "Idaho", "Illinois", "Indiana", "Iowa",
        "Kansas", "Kentucky", "Louisiana",
        "Maine", "Maryland", "Massachusetts", "Michigan", "Minnesota", 
        "Mississippi", "Missouri", "Montana",
        "Nebraska", "Nevada", "New Hampshire", "New Mexico", "New York",
        "North Carolina", "North Dakota", "Ohio", "Oklahoma", "Oregon", 
        "Pennsylvania", "Rhode Island", "South Carolina", "South Dakota",
        "Tennessee", "Texas", "Utah", "Vermont", "Virginia", 
        "Washington", "West Virginia", "Wisconsin", "Wyoming"  
    ];
}

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

    var aSuggestions = [];
    var sTextboxValue = oAutoSuggestControl.textbox.value;
	var intCountryId = '';
	var intRestrict = '';
	var intFiltered = '';
	
	if( document.getElementById('cid') != null ){ intFiltered = document.getElementById('ftd').value; }

    if (sTextboxValue.length > 3){
    
		if ( document.getElementById('cid') != null ){
		
			//if ( document.searchform.cres.checked ) {
				intCountryId = document.getElementById('cid').value;
				
			//}
			
		}	

		//Get the suggestions from the database
		var xmlhttp = getXmlHttp();
		xmlhttp.open("GET", '/xmlhttp/suggest-towns.asp?strbase=' + sTextboxValue + '&cid=' + intCountryId + '&ftd=' + intFiltered); 
		xmlhttp.onreadystatechange = function() {
			if (xmlhttp.readyState == 4) {
			  
			  //cb(xmlhttp.responseText);
			  
			  oAutoSuggestControl.autosuggest(xmlhttp.responseText.split("|"), bTypeAhead);
			  }
		  }
		  xmlhttp.send(null);
        /*search for matching states
        for (var i=0; i < this.states.length; i++) { 
            if (this.states[i].indexOf(sTextboxValue) == 0) {
                aSuggestions.push(this.states[i]);
            } 
        }*/
    }

    //provide suggestions to the control
    //oAutoSuggestControl.autosuggest(aSuggestions, bTypeAhead);
};

function getXmlHttp(){
  var xmlhttp;
  try {
    xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
  } catch (e) {
    try {
      xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    } catch (E) {
      xmlhttp = false;
    }
  }
  if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
    xmlhttp = new XMLHttpRequest();
  }
  return xmlhttp;
}