/**
 * 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;
    
    /**
     * 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.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 () {


    //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;
    //document.getElementById("suggest").appendChild(this.layer);
    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;
    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();
        }
    };
    
};

/**
 * 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.offsetParent) {
        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.offsetParent) {
        iTop += oNode.offsetTop;
        oNode = oNode.offsetParent;
    }
    
    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);
            this.textbox.value = oNode.firstChild.nodeValue;
        }
    }
};

/**
 * 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.goToSuggestion(-1);
            break;
        case 40: //down arrow 
            this.goToSuggestion(1);
            break;
        case 27: //esc
            this.textbox.value = this.userText;
            this.selectRange(this.userText.length, 0);
            /* falls through */
        case 13: //enter
            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 () {
            oThis.provider.requestSuggestions(oThis, false);
        }, 150);
        
    //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 () {
            oThis.provider.requestSuggestions(oThis, true);
        }, 150);
    }
};

/**
 * 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;
    
    //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();
};

/**
 * 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;
    this.layer.innerHTML = "";  //clear contents of the layer
    
    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.position="absolute";
    //this.layer.style.width=this.textbox.offsetWidth + "px";
    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);
    }
};



function SuggestionProvider() {
    this.http = createRequest();
}

/**
 * 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();
    }                 
    
    //define the data
    var oData = { 
        text: oAutoSuggestControl.userText,
        limit: 5 
    };
    
    //open connection to server
    oHttp.open("post", "http://www.retis.igeo.ufrj.br/wp-content/plugins/ajax-tag-suggest/php/suggestions.php", true);
    oHttp.onreadystatechange = function () {
        if (oHttp.readyState == 4) {
            //evaluate the returned text JavaScript (an array)
            var aSuggestions = JSON.parse(oHttp.responseText);

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

    //send the request
    oHttp.send(JSON.stringify(oData));

};


function createRequest(){
	if(typeof XMLHttpRequest != undefined){
		return new XMLHttpRequest();
	}else if(window.ActiveXObject){
	var aVersions=["MSXML2.XMLHttp.6.0","MSXML2.XMLHttp.3.0"];
		for(var i=0;i<aVersions.length;++i){
			try{
			var oHXR=new ActiveXObject(aVersions[i]);
			return oHXR;
			}catch(e){

			}
		}
	}
}