/***********************************************

 * Global variables

 ***********************************************/

var maxResults = 10;	// max # of results to display

var ignoreKeys = "";



/***********************************************

 * Prototype for populating data

 ***********************************************/

function get_data() {}



/***********************************************

 * Find search keys in data set

 ***********************************************/

function suggest(keywords,key)

{

	var results = document.getElementById("results");



	if(keywords != "")

	{

		var terms = get_data(); // sort? -- data should be alphabetical for best results



		var ul = document.createElement("ul");

		var li;

		var a;



		if ((key.keyCode == '40' || key.keyCode == '38' || key.keyCode == '13'))

		{

			navigate(key.keyCode);

		}

		else

		{

			var kIndex = -1;



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

			{

				kIndex = terms[i].activity.toLowerCase().indexOf(keywords.toLowerCase());



				if(kIndex >= 0)

				{

					li = document.createElement("li");



					// setup the link to populate the search box

					a = document.createElement("a");

					a.href = "javascript://";



					a.setAttribute("rel",terms[i].val);

					a.setAttribute("rev", getRank(terms[i].activity.toLowerCase(), keywords.toLowerCase()));



					if(!document.all) a.setAttribute("onclick","populate(this);");

					else a.onclick = function() { populate(this); }



					a.appendChild(document.createTextNode(""));



					if(keywords.length == 1)

					{

						var kws = terms[i].activity.toLowerCase().split(" ");

						var firstWord = 0;



						for(var j = 0; j < kws.length; j++)

						{

							if(kws[j].toLowerCase().charAt(0) == keywords.toLowerCase()) {



								ul.appendChild(li);



								if(j != 0) {

									kIndex = terms[i].activity.toLowerCase().indexOf(" " + keywords.toLowerCase());

									kIndex++;

								}



								break;

							}

						}

					}

					else if(keywords.length > 1) {

						ul.appendChild(li);

					}

					else continue;





					var before = terms[i].activity.substring(0,kIndex);

					var after = terms[i].activity.substring(keywords.length + kIndex, terms[i].activity.length);



					a.innerHTML = before + "<strong>" + keywords.toLowerCase() + "</strong>" + after;



					li.appendChild(a);



				}

			}



			if(results.hasChildNodes()) results.removeChild(results.firstChild);



			// position the list of suggestions

			var s = document.getElementById("s");

			var xy = findPos(s);



			results.style.left = xy[0] + "px";

			results.style.top = xy[1] + s.offsetHeight + "px";

			results.style.width = s.offsetWidth + "px";



			// if there are some results, show them

			if(ul.hasChildNodes()) {

				results.appendChild(filterResults(ul));



				if(results.firstChild.childNodes.length == 1) results.firstChild.firstChild.getElementsByTagName("a")[0].className = "hover";



			}



		}

	}

	else

	{

		if(results.hasChildNodes()) results.removeChild(results.firstChild);

	}

}



/***********************************************

 * Rank results - used for sorting result sets

 * 0 if entire row starts with kw

 * 0 < i < 1 if any word in row starts with kw (1k char max)

 * i > 1 if row contains kw anywhere else

 ***********************************************/

function getRank(activity, keywords)

{

	var ret = -1;

	var kIndex = activity.indexOf(keywords);



	ret = (activity.charAt(kIndex - 1) == " ") ? kIndex : (200*kIndex);



	return ret;

}



/***********************************************

 * Sort the result suggestion sets

 ***********************************************/

function filterResults(s)

{

	var sorted = new Array();



	for(var i = 0; i < s.childNodes.length; i++)

	{

		sorted.push(s.childNodes[i]);

	}



	var ul = document.createElement("ul");

	var lis = sorted.sort(sortIndex);



	for(var j = 0; j < lis.length; j++)

	{

		if(j < maxResults) ul.appendChild(lis[j]);

		else break;

	}



	return ul;



}



function sortIndex(a,b)

{

	// wow thats ugly -- need logic around grouped items getting out of order

	return (a.getElementsByTagName("a")[0].rev - b.getElementsByTagName("a")[0].rev);

}





/***********************************************

 * Navigate using up/down and submit with 'Enter'

 ***********************************************/

function navigate(key)

{

	var results = document.getElementById("results");

	var keyIndex = document.getElementById("keyIndex");



	var i = keyIndex.value;



	if(i == "" || !i) i = -1;

	else i = parseFloat(i);



	var ul = results.childNodes[0];



	if(ul)

	{

		if(key == '40') // DOWN

		{

			i++;

			if(i > ul.childNodes.length-1) i = ul.childNodes.length-1;



			keyIndex.value = i;



			try {

				ul.childNodes[i].getElementsByTagName("a")[0].className = "hover";

				ul.childNodes[i-1].getElementsByTagName("a")[0].className = "";

			}

			catch(e) {}

		}

		else if(key == '38') // UP

		{

			i--;

			if(i <= 0) i = 0;



			keyIndex.value = i;



			try {

				ul.childNodes[i].getElementsByTagName("a")[0].className = "hover";

				ul.childNodes[i+1].getElementsByTagName("a")[0].className = "";

			}

			catch(e) {}

		}

		else if(key == '13' || key == '9') // ENTER/TAB -- POPULATE

		{

			if(i == -1) i = 0;

			populate(ul.childNodes[i].getElementsByTagName("a")[0]);

		}

		else return;

	}

}



/***********************************************

 * Allow for using tab onkeydown

 ***********************************************/

function tabfix(keywords, key)

{

	if(key.keyCode == '9') {

		navigate(key.keyCode);

		return false;

	}

	else return true;

}



/***********************************************

 * Populate hidden fields via onclick on 'Enter'

 ***********************************************/

function populate(a)

{

	var ul = document.getElementById("results").childNodes[0];



	try {

		var pick = a.innerHTML.replace("<strong>","").replace("</strong>","");



		// IE6 converts HTML elements to uppercase -- could be done with RegExp

		if(document.all) pick = a.innerHTML.replace("<STRONG>","").replace("</STRONG>","");



		document.getElementById("s").value = pick;

	}

	catch(e) {}



	clearSuggest();

}



/***********************************************

 * Find an elements position on the screen

 ***********************************************/

function findPos(obj)

{

	var curleft = curtop = 0;

	if (obj.offsetParent) {

		curleft = obj.offsetLeft

		curtop = obj.offsetTop

		while (obj = obj.offsetParent) {

			curleft += obj.offsetLeft

			curtop += obj.offsetTop

		}

	}

	return [curleft,curtop];

}



/***********************************************

 * Helper to preserve onclick on suggestions

 ***********************************************/

function clearSuggest()

{

	// need a timeout so the onclick event is captured before results are hidden

	setTimeout("hideSuggest()",450);

}



/***********************************************

 * Hide the suggestions list and remove from DOM

 ***********************************************/

function hideSuggest()

{

	var results = document.getElementById("results");

	if(results.hasChildNodes()) results.removeChild(results.firstChild);



	document.getElementById("keyIndex").value = "-1"; // reset the suggestions index

}