/**

 * Extending jQuery with autocomplete

 * Version: 1.4.2

 * Author: Yanik Gleyzer (clonyara)

 */

(function($) {



// some key codes

 var RETURN = 13;

 var TAB = 9;

 var ESC = 27;

 var ARRLEFT = 37;

 var ARRUP = 38;

 var ARRRIGHT = 39;

 var ARRDOWN = 40;

 var BACKSPACE = 8;

 var DELETE = 46;



 var DEFAULT_SEARCH_URL;

 var DEFAULT_PROSPECTUS_PAGE = "/courses/index.cfm";

 var URL_PREFIX = "http://" + document.location.host;



if (document.URL.indexOf("author") != -1) {

	DEFAULT_SEARCH_URL = URL_PREFIX + "/author" + DEFAULT_PROSPECTUS_PAGE;

} else {

	DEFAULT_SEARCH_URL = URL_PREFIX + DEFAULT_PROSPECTUS_PAGE;

}


function debug(s){

  $('#info').append(htmlspecialchars(s)+'<br>');

}

// getting caret position obj: {start,end}

function getCaretPosition(obj){

  var start = -1;

  var end = -1;

  if(typeof obj.selectionStart != "undefined"){

    start = obj.selectionStart;

    end = obj.selectionEnd;

  }

  else if(document.selection&&document.selection.createRange){

    var M=document.selection.createRange();

    var Lp;

    try{

      Lp = M.duplicate();

      Lp.moveToElementText(obj);

    }catch(e){

      Lp=obj.createTextRange();

    }

    Lp.setEndPoint("EndToStart",M);

    start=Lp.text.length;

    if(start>obj.value.length)

      start = -1;

    

    Lp.setEndPoint("EndToStart",M);

    end=Lp.text.length;

    if(end>obj.value.length)

      end = -1;

  }

  return {'start':start,'end':end};

}

// set caret to

function setCaret(obj,l){

  obj.focus();

  if (obj.setSelectionRange){

    obj.setSelectionRange(l,l);

  }

  else if(obj.createTextRange){

    m = obj.createTextRange();      

    m.moveStart('character',l);

    m.collapse();

    m.select();

  }

}

// prepare array with velued objects

// required properties are id and value

// rest of properties remaines

function prepareArray(jsondata){

  var new_arr = [];

  for(var i=0;i<jsondata.length;i++){

    if(jsondata[i].id != undefined && jsondata[i].value != undefined){

      jsondata[i].id = jsondata[i].id+"";

      jsondata[i].value = jsondata[i].value+"";

      if(jsondata[i].info != undefined)

        jsondata[i].info = jsondata[i].info+"";

      new_arr.push(jsondata[i]);

    }

  }

  return new_arr;

}

// php analogs

function escapearg(s){

  if(s == undefined || !s) return '';

  return s.replace('\\','\\\\').

           replace('*','\\*').

           replace('.','\\.').

           replace('/','\\/');

}

function htmlspecialchars(s){

  if(s == undefined || !s) return '';

  return s.replace('&','&amp;').

           replace('<','&lt;').

           replace('>','&gt;');

}

function ltrim(s){

  if(s == undefined || !s) return '';

  return s.replace(/^\s+/g,'');

}



// extending jQuery

$.fn.autocomplete = function(options){ return this.each(function(){

  // take me

  var me = $(this);

  var me_this = $(this).get(0);



  // test for supported text elements

  if(!me.is('input:text,input:password,textarea'))

  return;



  // get or ajax_get required!

  if(!options && (!$.isFunction(options.get) || !options.ajax_get)){

  return;

  }  

  // check plugin enabled

  if(me.attr('jqac') == 'on') return;



  // plugin on!

  me.attr('jqac','on');



  // no browser's autocomplete!

  me.attr('autocomplete','off');



  // default options

  options = $.extend({ 

                      delay     : 500 ,

                      timeout   : 5000 ,

                      minchars  : 3 ,

                      multi     : false ,

                      cache     : false , 

                      height    : 150 ,

                      autowidth : false ,

                      noresults : 'No results'

                      },

                      options);

  // bind key events

  // handle special keys here

  me.keydown(function(ev){

    switch(ev.which){

      // return choose highlighted item or default propogate

      case RETURN:

		return true

        //if(!suggestions_menu) return true;

        //else setHighlightedValue();

        // setHighlightedValue();

		// return false;

      // escape clears menu

      case ESC:

        clearSuggestions();

        return false;

    }

    return true;

  });

  me.keypress(function(ev){

    // ev.which doesn't work here - it always returns 0

    switch(ev.keyCode){

      case RETURN: case ESC:

        return false;

      // up changes highlight

//PW      case ARRUP:

//PW        changeHighlight(ev.keyCode);

//PW        return false;

      // down changes highlight or open new menu

//PW      case ARRDOWN:

//PW        if(!suggestions_menu) getSuggestions(getUserInput());

//PW        else changeHighlight(ev.keyCode);

//PW        return false;

     }

     return true;

  });

  // handle normal characters here

  me.keyup(function(ev) {

      switch(ev.which) {

      case ARRUP: //PW

        changeHighlight(ev.keyCode); //PW

        return false; //PW

      // down changes highlight or open new menu //PW

      case ARRDOWN: //PW

        if(!suggestions_menu) getSuggestions(getUserInput()); //PW

        else changeHighlight(ev.keyCode); //PW

        return false; //PW

      case RETURN:

//alert("suggestions_menu = " + suggestions_menu + "       current_highlight = " + current_highlight);

			if(current_highlight == 0) 
	  {
		  	clearSuggestions();			
			document.forms["course-finder-form"].submit();
	  		
	  }else{
		  		if (suggestions_menu) setHighlightedValue();   // {window.location = suggestions[current_highlight-1].url; //PW
				else window.location = DEFAULT_SEARCH_URL;  
				
		   }
//PW case ESC: case ARRLEFT: case ARRRIGHT: //PW

//PW        case RETURN: case ESC: case ARRLEFT: case ARRRIGHT: case ARRUP: case ARRDOWN:

          return false;

        default:

          getSuggestions(getUserInput());

      }

      return true;

  });



  // init variables

  var user_input = "";

  var input_chars_size  = 0;

  var suggestions = [];

  var current_highlight = 0;

  var suggestions_menu = false;

  var suggestions_list = false;

  var loading_indicator = false;

  var clearSuggestionsTimer = false;

  var getSuggestionsTimer = false;

  var showLoadingTimer = false;

  var zIndex = me.css('z-index');



  // get user input

  function getUserInput(){

    var val = me.val();

    if(options.multi){

      var pos = getCaretPosition(me_this);

      var start = pos.start;

      for(;start>0 && val.charAt(start-1) != ',';start--){}

      var end = pos.start;

      for(;end<val.length && val.charAt(end) != ',';end++){}

      var val = val.substr(start,end-start);

    }

    return ltrim(val);

  }

  // set suggestion

  function setSuggestion(val){

    user_input = val;

    if(options.multi){

      var orig = me.val();

      var pos = getCaretPosition(me_this);

      var start = pos.start;

      for(;start>0 && orig.charAt(start-1) != ',';start--){}

      var end = pos.start;

      for(;end<orig.length && orig.charAt(end) != ',';end++){}

      var new_val = orig.substr(0,start) + (start>0?' ':'') + val + orig.substr(end);

      me.val(new_val);

      setCaret(me_this,start + val.length + (start>0?1:0));

    }

    else{

      me_this.focus();

      me.val("");  //PW Blank out the search term to avoid the user having to do so themselves

    }

  }

  // get suggestions

  function getSuggestions(val){

    // input length is less than the min required to trigger a request

    // reset input string

    // do nothing

    if (val.length < options.minchars){

      clearSuggestions();

      return false;

    }

    // if caching enabled, and user is typing (ie. length of input is increasing)

    // filter results out of suggestions from last request

    if (options.cache && val.length > input_chars_size && suggestions.length){

      var arr = [];

      for (var i=0;i<suggestions.length;i++){

        var re = new RegExp("\b"+escapearg(val),'ig');

        if(re.exec(suggestions[i].value))

          arr.push( suggestions[i] );

      }

      user_input = val;

      input_chars_size = val.length;

      suggestions = arr;

      createList(suggestions);

      return false;

    }

    else{// do new request

      clearTimeout(getSuggestionsTimer);

      user_input = val;

      input_chars_size = val.length;

      getSuggestionsTimer = setTimeout( 

        function(){ 

          suggestions = [];

          // call pre callback, if exists

          if($.isFunction(options.pre_callback))

            options.pre_callback();

          // call get

          if($.isFunction(options.get)){

            suggestions = prepareArray(options.get(val));

            createList(suggestions);

          }

          // call AJAX get

          else if($.isFunction(options.ajax_get)){

            clearSuggestions();

            showLoadingTimer = setTimeout(show_loading,options.delay);

            options.ajax_get(val,ajax_continuation);

          }

        },

        options.delay );

    }

    return false;

  };

  // AJAX continuation

  function ajax_continuation(jsondata){

    hide_loading();

    suggestions = prepareArray(jsondata);

    createList(suggestions);

  }

  // shows loading indicator

  function show_loading(){

    if(!loading_indicator){

      loading_indicator = $('<div class="jqac-menu"><p>Loading...</p></div>').get(0);

      $(loading_indicator).css('position','absolute');

      var pos = me.offset();

      $(loading_indicator).css('left', pos.left + "px");

      $(loading_indicator).css('top', ( pos.top + me.height() + 2 ) + "px");

      if(!options.autowidth)

        $(loading_indicator).width(me.width());

      $('body').append(loading_indicator);

    }

    $(loading_indicator).show();

    setTimeout(hide_loading,10000);

  }

  // hides loading indicator 

  function hide_loading(){

    if(loading_indicator)

      $(loading_indicator).hide();

    clearTimeout(showLoadingTimer);

  }

  // create suggestions list

  function createList(arr){

    if(suggestions_menu)

      $(suggestions_menu).remove();

    hide_loading();

    killTimeout();



    // create holding div

    suggestions_menu = $('<div class="jqac-menu"></div>').get(0);



    // ovveride some necessary CSS properties 

    $(suggestions_menu).css({'position':'absolute',

                             'z-index':zIndex,

                             'max-height':options.height+'px',

                             'overflow-y':'auto'});



    // create and populate ul

    suggestions_list = $('<ul></ul>').get(0);

    // set some CSS's

    $(suggestions_list).

      css('list-style','none').

      css('margin','0px').

      css('padding','0px').

      css('overflow','hidden');

    // regexp for replace 

//PW var re = new RegExp("("+escapearg(htmlspecialchars(user_input))+")",'ig');

     var re = new RegExp("\\b("+escapearg(htmlspecialchars(user_input))+")",'i'); //PW

    // loop throught arr of suggestions creating an LI element for each suggestion

    for (var i=0;i<arr.length;i++){

      var val = new String(arr[i].value);

	  var info = new String(arr[i].info);

      // using RE

      var output = htmlspecialchars(val).replace(re,'<span class="searchmatch">$1</span>');

	  var span = $('<span class="jqac-link">'+output+'</span>').get(0);

//PW	if (arr[i].info != undefined && arr[i].info != ""){

//PW		$(span).append($('<div class="jqac-info">'+arr[i].info+'</div>'));

//PW	}



      $(span).attr('name',i+1);

      $(span).click(function () { setHighlightedValue(); });

      $(span).mouseover(function () { setHighlight($(this).attr('name'),true); });



      var li = $('<li></li>').get(0);



	if (arr[i].id == -1) //PW

		li.className = "jqac-header-" + info; //PW

	else //PW

		li.className = "jqac-link-" + info;   //PW Set the style of the pg/ug li to differentiate between the two course levels

	li.id = info;   //PW pick this up later to restore the colour after the li has been highlighted and another row has been moved on to



      $(li).append(span);



      $(suggestions_list).append(li);

    }



    // no results

    if (arr.length == 0){

      $(suggestions_list).append('<li class="jqac-warning">'+options.noresults+'</li>');

    }

    $(suggestions_menu).append(suggestions_list);



    // get position of target textfield

    // position holding div below it

    // set width of holding div to width of field

    var pos = me.offset();



    $(suggestions_menu).css('left', pos.left + "px");

    $(suggestions_menu).css('top', ( pos.top + me.height() + 2 ) + "px");

    if(!options.autowidth)

      $(suggestions_menu).width(me.width());



    // set mouseover functions for div

    // when mouse pointer leaves div, set a timeout to remove the list after an interval

    // when mouse enters div, kill the timeout so the list won't be removed

    $(suggestions_menu).mouseover(function(){ killTimeout() });

    $(suggestions_menu).mouseout(function(){ resetTimeout() });



    // add DIV to document

    $('body').append(suggestions_menu);



    // bgIFRAME support

    if($.fn.bgiframe)

      $(suggestions_menu).bgiframe({height: suggestions_menu.scrollHeight});



    // adjust height: add +20 for scrollbar

    if(suggestions_menu.scrollHeight > options.height){

      $(suggestions_menu).height(options.height);

      $(suggestions_menu).width($(suggestions_menu).width()+27);

    }



    // currently no item is highlighted

    current_highlight = 0;



    // remove list after an interval

    clearSuggestionsTimer = setTimeout(function () { clearSuggestions() }, options.timeout);

  };

  // set highlighted value

  function setHighlightedValue(){

    if(current_highlight && suggestions[current_highlight-1]){

      var sugg = suggestions[ current_highlight-1 ];

	  //if (sugg.id == -1) return; //PW Don't do anything if the user clicks on a 'Undergraduate/Postgraduate' heading

      if(sugg.affected_value != undefined && sugg.affected_value != '')

        setSuggestion(sugg.affected_value);

      else

      {

         // They've either clicked on the 'Undergraduate courses' or 'Postgraduate

         // courses' headings so send them to the course search page.

         window.location = DEFAULT_SEARCH_URL;   // + "&q=" + document.getElementById("q").value;

      }



      // pass selected object to callback function, if exists

      if ($.isFunction(options.callback))

        options.callback( suggestions[current_highlight-1] );

      //PWclearSuggestions();

      //PW: Code to automatically redirect to the selected prospectus page when clicked

		if (sugg.id != -1) window.location = sugg.url; //PW Don't redirect if they're on a 'Undergraduate/Postgraduate' heading

    }

  };

  // change highlight according to key

  function changeHighlight(key){

    if(!suggestions_list || suggestions.length == 0) return false;

    var n;

    if (key == ARRDOWN)

      n = current_highlight + 1;

    else if (key == ARRUP)

      n = current_highlight - 1;



    if (n > $(suggestions_list).children().size())

      n = 1;

    if (n < 1)

      n = $(suggestions_list).children().size();

    setHighlight(n);

  };



  // change highlight

  function setHighlight(n,mouse_mode){

    if (!suggestions_list) return false;

    if (current_highlight > 0) clearHighlight();

    current_highlight = Number(n);

    var li = $(suggestions_list).children().get(current_highlight-1);

//PW    li.className = 'jqac-highlight';

	var cRow = $(suggestions_list).children().get(current_highlight-1).className; //PW

	if (cRow.indexOf("header") > -1) //PW

		li.className = cRow.replace(/header/,"header-highlight"); //PW

	else //PW

		li.className = cRow.replace(/link/, "highlight"); //PW

	// for mouse mode don't adjust scroll! prevent scrolling jumps

    if(!mouse_mode) adjustScroll(li);

    killTimeout();

  };

  // clear highlight

  function clearHighlight(){

    if (!suggestions_list)return false;

    if (current_highlight > 0){

    // User is moving to a different li so restore the colour of the row that WAS being highlighted

	var cRow = $(suggestions_list).children().get(current_highlight-1).className;

	if (cRow.indexOf("header") > -1) //PW

		$(suggestions_list).children().get(current_highlight-1).className = cRow.replace(/highlight-/,""); //PW

	else //PW

	    $(suggestions_list).children().get(current_highlight-1).className = cRow.replace(/highlight/, "link"); //PW

//	  $(suggestions_list).children().get(current_highlight-1).className = 'jqac-link-' + $(suggestions_list).children().get(current_highlight-1).id; //PW

      current_highlight = 0; //PW

    }

  };

  // clear suggestions list

  function clearSuggestions(){

    killTimeout();

    if(suggestions_menu){

      $(suggestions_menu).remove();

      suggestions_menu = false;

      suggestions_list = false;

      current_highlight = 0;

    }

  };

  // set scroll

  function adjustScroll(el){

    if(!suggestions_menu) return false;

    var viewportHeight = suggestions_menu.clientHeight;        

    var wholeHeight = suggestions_menu.scrollHeight;

    var scrolled = suggestions_menu.scrollTop;

    var elTop = el.offsetTop;

    var elBottom = elTop + el.offsetHeight;

    if(elBottom > scrolled + viewportHeight){

      suggestions_menu.scrollTop = elBottom - viewportHeight;

    }

    else if(elTop < scrolled){

      suggestions_menu.scrollTop = elTop;

    }

    return true; 

  }

  // timeout funcs

  function killTimeout(){

    clearTimeout(clearSuggestionsTimer);

  };

  function resetTimeout(){

    clearTimeout(clearSuggestionsTimer);

    clearSuggestionsTimer = setTimeout(function () { clearSuggestions() }, 1000);

  };



})};



})($);