// **************************************************
// Global
// **************************************************
var oTextbox;
function startAutoSuggest(path){
    oTextbox = new AutoSuggestControl(document.getElementById(GetClientId("txtSuchtext")), new SearchSuggestion(path));
}

// **************************************************
// AutoSuggest Control
// **************************************************
/**
 * An autosuggest textbox control.
 * @class
 * @scope public
 */
function AutoSuggestControl(oTextbox /*:HTMLInputElement*/, 
                            oProvider /*:SuggestionProvider*/) {
    
       
    /**
     * The currently selected suggestions.
     * @scope private
     */   
    this.cur /*:int*/ = 0;

    /**
     * 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;
    
    if (this.textbox == null || this.textbox == 'undefined')
        return;
    
    //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*/,
													 suchtext) {
    
    //make sure there's at least one suggestion
    this.cur = 0;
    if (aSuggestions != null && aSuggestions != 'undefined'){
		if (aSuggestions.length > 0 && aSuggestions[0].length >= 3) {
			if (bTypeAhead) {
			this.typeAhead(aSuggestions[0]);
			}
	        
			this.showSuggestions(aSuggestions, suchtext);
		} 
		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 - 60;
    this.layer.style.zIndex = 100;
    
    //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 (oTarget.id.indexOf("_strong") >= 0)
				oTarget = oTarget.parentNode;
				
		if (oEvent.type == "mousedown") {
            //oThis.textbox.value = oTarget.id;
            //oThis.hideSuggestions();
            window.location.href = oTarget.getAttribute('link');
        } else if (oEvent.type == "mouseover") {
			if (oTarget.id != ''){
				oThis.highlightSuggestion(oTarget);
				oThis.textbox.value = oTarget.id;
			}
        } 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;
	var oTarget = oEvent.target || oEvent.srcElement;
    //for backspace (8) and delete (46), shows suggestions without typeahead
    if (iKeyCode == 8 || iKeyCode == 46) {
		if (oTarget.value == '' || oTarget.value == ' '){
			this.hideSuggestions();
		}
		else {
			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";
    this.cur = 0;
};

/**
 * 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;
    
    //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.id; 
    }
};

/**
 * 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.id;   
    }
};

/**
 * 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*/, suchtext) {
    
    var oDiv = null;
    var oSpan = null;
    this.layer.innerHTML = "";  //clear contents of the layer
     
     oSpan = document.createElement("div");
     oSpan.className = 'header';
     oSpan.innerHTML = "Suchvorschl&auml;ge"
     /*oSpan.style.background = '#339900';
     oSpan.style.fontWeight = 'bold';
     oSpan.foreColor = 'white';
     oSpan.style.borderBottom = 'solid black 1px';*/
     
        
     this.layer.appendChild(oSpan);
     oSpan = null; 
    
    for (var i=0; i < aSuggestions.length; i++) {
        
        oSpan = document.createElement("div");
        oSpan.id = aSuggestions[i];
        oSpan.setAttribute('link', this.provider.path + '/eshop/bildungsbausteine.aspx?ST=' + oSpan.id, 0); 
        oSpan.innerHTML = aSuggestions[i].replace(suchtext.toUpperCase(), '<strong id="' + oSpan.id + '_strong">'+ suchtext.toUpperCase() + '</strong>');
        oSpan.style.width = '162px';
                
        this.layer.appendChild(oSpan);
        
    }
      
    
    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);
    }
};

// **************************************************
// Suggestion Provider
// **************************************************
/**
 * Provides suggestions for state names (USA).
 * @class
 * @scope public
 */
function SearchSuggestion(path) {
    this.searchterms = [];
    this.path = path;
}

/**
 * Request suggestions for the given autosuggest control. 
 * @scope protected
 * @param oAutoSuggestControl The autosuggest control to provide suggestions for.
 */
SearchSuggestion.prototype.requestSuggestions = function (oAutoSuggestControl /*:AutoSuggestControl*/,
                                                          bTypeAhead /*:boolean*/) {
    var aSuggestions;
    var sTextboxValue = oAutoSuggestControl.textbox.value;
    
    if (sTextboxValue.length >= 2){
       this.getSuggestions(sTextboxValue, oAutoSuggestControl, bTypeAhead);
     }

    //provide suggestions to the control
};



SearchSuggestion.prototype.getSuggestions = function (suchtext, oAutoSuggestControl, bTypeAhead){
	var xml = false;
	var url;
	
	url = this.path + "/includes/provider.aspx?ST=" + Url.encode(suchtext) /*+ '*'*/;
	
	try {
			xml = new ActiveXObject("Msxml2.XMLHTTP");
	} 
	catch (e) {
			try {
				xml = new ActiveXObject("Microsoft.XMLHTTP");
			} 
			catch (e) {
				xml = false;
			}
	}

	if (!xml && typeof XMLHttpRequest != 'undefined'){
		xml = new XMLHttpRequest();
	}
		
	if( oAutoSuggestControl != null && oAutoSuggestControl != 'undefined' ){
		xml.open("GET", url);
	
		xml.onreadystatechange = function() {
			if (xml.readyState == 4 && xml.status == 200) {
				oAutoSuggestControl.autosuggest(xml.responseText.split(","), bTypeAhead, suchtext);
			}
		}
	
		xml.send(null);
	}
}

/**
*
*  URL encode / decode
*  http://www.webtoolkit.info/
*
**/
 
var Url = {
 
	// public method for url encoding
	encode : function (string) {
		return escape(this._utf8_encode(string));
	},
 
	// public method for url decoding
	decode : function (string) {
		return this._utf8_decode(unescape(string));
	},
 
	// private method for UTF-8 encoding
	_utf8_encode : function (string) {
		string = string.replace(/\r\n/g,"\n");
		var utftext = "";
 
		for (var n = 0; n < string.length; n++) {
 
			var c = string.charCodeAt(n);
 
			if (c < 128) {
				utftext += String.fromCharCode(c);
			}
			else if((c > 127) && (c < 2048)) {
				utftext += String.fromCharCode((c >> 6) | 192);
				utftext += String.fromCharCode((c & 63) | 128);
			}
			else {
				utftext += String.fromCharCode((c >> 12) | 224);
				utftext += String.fromCharCode(((c >> 6) & 63) | 128);
				utftext += String.fromCharCode((c & 63) | 128);
			}
 
		}
 
		return utftext;
	},
 
	// private method for UTF-8 decoding
	_utf8_decode : function (utftext) {
		var string = "";
		var i = 0;
		var c = c1 = c2 = 0;
 
		while ( i < utftext.length ) {
 
			c = utftext.charCodeAt(i);
 
			if (c < 128) {
				string += String.fromCharCode(c);
				i++;
			}
			else if((c > 191) && (c < 224)) {
				c2 = utftext.charCodeAt(i+1);
				string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
				i += 2;
			}
			else {
				c2 = utftext.charCodeAt(i+1);
				c3 = utftext.charCodeAt(i+2);
				string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
				i += 3;
			}
 
		}
 
		return string;
	}
 
}