var field_display = 0;
var field_value = 1;
var field_set = 2;

/**
 * An autosuggest textbox control.
 * @class
 * @scope public
 */
function AutoSuggestControl(oTextbox /*:HTMLInputElement*/,
                            oProvider /*:SuggestionProvider*/,
                            oSearch,
                            oFilename,
                            oWidth,
                            oExtras) {
    /**
     * The currently selected suggestions.
     * @scope private
     */

    this.cur /*:int*/ = -1;

    /**
     * The dropdown list layer.
     * @scope private
     */
    this.layer = null;
    this.commment = null;
    this.inactive = true;
    this.callFile = oFilename;

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

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

    // save original value when we entered the textbox
    this.original_value = oTextbox.value;

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

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

    this.search /*:String*/ = oSearch;

    this.width = oWidth;

    this.extras = oExtras;

    //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*/)
{
  // first half of array is labels, 2nd half is record numbers
  var l = aSuggestions.length;
  var SaveText;

  // save the array
  this.suggestions=aSuggestions;

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

  //make sure there's at least one suggestion
  if (l > 0) {
    if (bTypeAhead) {
      SaveText=this.textbox.value;
      eval(aSuggestions[0][field_set]);
      this.textbox.value=SaveText;
      this.typeAhead(aSuggestions[0][field_value]);
      //running this twice breaks the typeAhead
      //eval(aSuggestions[0][field_set]);
    }
    this.showSuggestions(aSuggestions,l);
  } else {
    this.hideSuggestions();
  }
};

//var test_array = [
//[ "element 1,1" , "element 1,2" ],
//[ "element 2,1" , "element 2,2" ],
//];
/**
 * Creates the dropdown layer to display multiple suggestions.
 * @scope private
 */
AutoSuggestControl.prototype.createDropDown = function () {
    //create the layer and assign styles
    //this.comment = document.createElement("span");
    //this.comment.className = "suggestions";
    //this.comment.innerHTML="TEST";
    //document.body.appendChild(this.comment);
    this.layer = document.createElement("div");
    this.layer.className = "suggestions";
    this.layer.style.display = "none";
    if (this.width.length) {
      this.layer.style.width = this.width;
    } else {
      this.layer.style.width = this.textbox.offsetWidth;
    }
    document.body.appendChild(this.layer);

    //alert(JSON.stringify(test_array));

    //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;
            var i=oTarget.element_number;
            eval(oThis.suggestions[i][field_set]);
            oThis.cur=i;
            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.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;
};

/**
 * 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) {
            // node is selected
            this.highlightSuggestion(oNode);
            this.textbox.value = oNode.firstChild.nodeValue;
            //alert('Node element='+oNode.element_number);
            var i=oNode.element_number;
            eval(this.suggestions[i][field_set]);
            //if (document.sciform && document.sciform.Dbuffer__blur_request) {
            //  document.sciform.Dbuffer__blur_request.value=i + ' ' + this.suggestions[i][field_set] + ' ';
            //}
        }
    }
};

/**
 * 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);
            kill_event(oEvent);
            break;
        case 40: //down arrow
            this.goToSuggestion(1);
            kill_event(oEvent);
            break;
        case 27: //esc
            this.textbox.value = this.userText;
            this.selectRange(this.userText.length, 0);
            /* falls through */
        case 13: //enter
            this.hideSuggestions();
            kill_event(oEvent);
            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);
    oThis.inactive=false;

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

        this.timeoutId = setTimeout( function () {
            if (!oThis.inactive)
              oThis.provider.requestSuggestions(oThis, false);
        }, 250);

    //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 () {
            if (!oThis.inactive)
              oThis.provider.requestSuggestions(oThis, false);
              //oThis.provider.requestSuggestions(oThis, true);
        }, 250);
    }
};

/**
 * Hides the suggestion dropdown.
 * @scope private
 */
AutoSuggestControl.prototype.hideSuggestions = function ()
{
  this.layer.style.display = "none";
  enable_select();
};

/**
 * 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);
    };

    this.textbox.onfocus = function () {
      disable_submit=1;
    }

    //assign onblur event handler (hides suggestions)
    this.textbox.onblur = function () {
      if (oThis.original_value == oThis.textbox.value) {
        // turn submit back on
        check_submit();
      } else {
        // do the lookup
        var found_match;
        found_match=false;
        oThis.inactive=true;
        // find the record number
        if (oThis.suggestions!=null) {
          if (oThis.cur >= 0 && oThis.cur<oThis.suggestions.length && oThis.textbox.value==oThis.suggestions[oThis.cur][field_value]) {
            //if (document.sciform && document.sciform.Dbuffer__blur_request) {
            //  document.sciform.Dbuffer__blur_request.value=oThis.cur + ' ' + oThis.suggestions[oThis.cur][field_set];
            //}
            eval(oThis.suggestions[oThis.cur][field_set]);
            found_match=true;
          }
        }
        if (!found_match) {
          var extras = '';
          if (oThis.extras.length) {
            extras='&'+eval(oThis.extras);
          }
          call('/cgi-bin/call?Ftext='+oThis.textbox.value+'&Faction=SET&Fwebspec='+document.sciform.Fwebspec.value+'&Fsearch='+oThis.search+'&Fcallfile='+oThis.callFile+extras,null,eval);
          //if (document.sciform && document.sciform.Dbuffer__blur_request) {
          // document.sciform.Dbuffer__blur_request.value='/cgi-bin/call?Ftext='+oThis.textbox.value+'&Faction=SET&Fwebspec='+document.sciform.Fwebspec.value+'&Fsearch='+oThis.search+'&Fcallfile='+oThis.callFile;
          //}
        }
        oThis.hideSuggestions();
        if (found_match) {
          check_submit();
        }
      }
    }

    //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*/,
                                                         iSize) {

    var oDiv = null;
    var SuggestItem = null;
    this.layer.innerHTML = "";  //clear contents of the layer

    disable_select();

    for (var i=0; i < iSize; i++) {
        oDiv = document.createElement("div");
        oDiv.innerHTML=aSuggestions[i][field_display];
        oDiv.element_number=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.display = "";
    if (!this.width.length && !parseInt(this.layer.style.width)) {
      this.layer.style.width = this.textbox.offsetWidth;
    }
};

/**
 * 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;
        //alert('Select Range iLen '+iLen+' Length '+sSuggestion.length);
        this.selectRange(iLen, sSuggestion.length);
    } else {
      alert("Text range is not supported");
    }
};

/**
 * Provides suggestions for state/province names.
 * @class
 * @scope public
 */
function SuggestionProvider()
{
  // this.http = zXmlHttp.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 oText = oAutoSuggestControl.userText;
    var extras = '';
    if (oAutoSuggestControl.extras.length) {
      extras='&'+eval(oAutoSuggestControl.extras);
    }
    call("/cgi-bin/call?Fwebspec="+document.sciform.Fwebspec.value+"&Fsearch="+oAutoSuggestControl.search+"&Ftext="+oAutoSuggestControl.userText+"&Fcallfile="+oAutoSuggestControl.callFile+extras,
          null,
          function (responseText) {
            // evaluate the returned text JavaScript (an array)
              if (responseText.length && oText == oAutoSuggestControl.userText) {
                var aSuggestions = JSON.parse(responseText);
                if (!oAutoSuggestControl.inactive && aSuggestions!=null && aSuggestions.length)
                  oAutoSuggestControl.autosuggest(aSuggestions,bTypeAhead);
                else
                  oAutoSuggestControl.hideSuggestions();
            }
          });
    //if (document.sciform && document.sciform.Dbuffer__suggest_request) {
    //  document.sciform.Dbuffer__suggest_request.value="Fwebspec="+document.sciform.Fwebspec.value+"&Fsearch="+oAutoSuggestControl.search+"&Ftext="+oAutoSuggestControl.userText+"&Fcallfile="+oAutoSuggestControl.callFile;
    //}
};