/* Modification of sorttable.js
 * http://www.kryogenix.org/code/browser/sorttable/
 * Original code by Stuart Langridge, November 2003
 * Modified by Andy Edmonds, December 2003
 *  Added alternateRowColors to color alternating rows
 * Modified by caspar.dk, November 2004
 *  Added cookie-memory to remember most recent sorting
 *  Released at http://netfactory.dk/technology/markup/javascript/
 */
 
addEvent(window, "load", sortables_init);

var SORT_COLUMN_INDEX;

function sortables_init() {
    // Find all tables with class sortable and make them sortable
    if (!document.getElementsByTagName) return;
    tbls = document.getElementsByTagName("table");
    for (ti=0;ti<tbls.length;ti++)
    {
        thisTbl = tbls[ti];
        if (((' '+thisTbl.className+' ').indexOf("sortable") != -1) && (thisTbl.id)) {
            //initTable(thisTbl.id);
            ts_makeSortable(thisTbl);
        }
    }
		alternateRowColors();
}

function ts_makeSortable(table) {
    
    var sort_elm;
    var cookie_index = ts_get_cookie_index(table.id);
    var cookie_direction = ts_get_cookie_direction(table.id);
    
    if (table.rows && table.rows.length > 0) {
        var firstRow = table.rows[0];
    }
    if (!firstRow) return;
    
    // We have a first row: assume it's the header, and make its contents clickable links
    for (var i=0;i<firstRow.cells.length;i++)
    {
        var cell = firstRow.cells[i];
        var txt = ts_getInnerText(cell);
        cell.innerHTML = '<a href="#" class="sortheader" onclick="ts_resortTable(this);return false;">'+txt+'<span class="sortarrow">&nbsp;&nbsp;&nbsp;</span></a>';
        if(cookie_index==i)
        {
          sort_elm = cell.getElementsByTagName("A")[0];
        }
    }
    if(sort_elm)
    {
      if(cookie_direction==1)
      {
        ts_resortTable(sort_elm);
        ts_resortTable(sort_elm);
      }
      else
      {
        ts_resortTable(sort_elm);
      }
    }
}

function ts_getInnerText(el) {
	if (typeof el == "string") return el;
	if (typeof el == "undefined") { return el };
	if (el.innerText) return el.innerText;	//Not needed but it is faster
	var str = "";
	
	var cs = el.childNodes;
	var l = cs.length;
	for (var i = 0; i < l; i++) {
		switch (cs[i].nodeType) {
			case 1: //ELEMENT_NODE
				str += ts_getInnerText(cs[i]);
				break;
			case 3:	//TEXT_NODE
				str += cs[i].nodeValue;
				break;
		}
	}
	return str;
}

function ts_resortTable(lnk) {
    // get the span
    var span;
    for (var ci=0;ci<lnk.childNodes.length;ci++) {
        if (lnk.childNodes[ci].tagName && lnk.childNodes[ci].tagName.toLowerCase() == 'span') span = lnk.childNodes[ci];
    }
    var spantext = ts_getInnerText(span);
    var td = lnk.parentNode;
    var column = td.cellIndex;
    var table = getParent(td,'TABLE');
       
    // Work out a type for the column
    if (table.rows.length <= 1) return;
    var itm = ts_getInnerText(table.rows[1].cells[column]);
    sortfn = ts_sort_caseinsensitive;
    if (itm.match(/^\d\d[\/-]\d\d[\/-]\d\d\d\d$/)) sortfn = ts_sort_date;
    if (itm.match(/^\d\d[\/-]\d\d[\/-]\d\d$/)) sortfn = ts_sort_date;
    if (itm.match(/^[£$]/)) sortfn = ts_sort_currency;
    if (itm.match(/^[\d\.]+$/)) sortfn = ts_sort_numeric;
    SORT_COLUMN_INDEX = column;
    var firstRow = new Array();
    var newRows = new Array();
    for (i=0;i<table.rows[0].length;i++) { firstRow[i] = table.rows[0][i]; }
    for (j=1;j<table.rows.length;j++) { newRows[j-1] = table.rows[j]; }

    newRows.sort(sortfn);

    if (span.getAttribute("sortdir") == 'down') {
        ARROW = '&nbsp;&nbsp;&uarr;';
        newRows.reverse();
        span.setAttribute('sortdir','up');
        ts_set_cookie(table.id, SORT_COLUMN_INDEX + ",1");
    } else {
        ARROW = '&nbsp;&nbsp;&darr;';
        span.setAttribute('sortdir','down');
        ts_set_cookie(table.id, SORT_COLUMN_INDEX + ",0");
    }
    
    // We appendChild rows that already exist to the tbody, so it moves them rather than creating new ones
    // don't do sortbottom rows
    for (i=0;i<newRows.length;i++) { if (!newRows[i].className || (newRows[i].className && (newRows[i].className.indexOf('sortbottom') == -1))) table.tBodies[0].appendChild(newRows[i]);}
    // do sortbottom rows only
    for (i=0;i<newRows.length;i++) { if (newRows[i].className && (newRows[i].className.indexOf('sortbottom') != -1)) table.tBodies[0].appendChild(newRows[i]);}
    
    // Delete any other arrows there may be showing
    var allspans = document.getElementsByTagName("span");
    for (var ci=0;ci<allspans.length;ci++) {
        if (allspans[ci].className == 'sortarrow') {
            if (getParent(allspans[ci],"table") == getParent(lnk,"table")) { // in the same table as us?
                allspans[ci].innerHTML = '&nbsp;&nbsp;&nbsp;';
            }
        }
    }
        
    span.innerHTML = ARROW;
		alternateRowColors();
}

function getParent(el, pTagName) {
	if (el == null) return null;
	else if (el.nodeType == 1 && el.tagName.toLowerCase() == pTagName.toLowerCase())	// Gecko bug, supposed to be uppercase
		return el;
	else
		return getParent(el.parentNode, pTagName);
}
function ts_sort_date(a,b) {
    // y2k notes: two digit years less than 50 are treated as 20XX, greater than 50 are treated as 19XX
    aa = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]);
    bb = ts_getInnerText(b.cells[SORT_COLUMN_INDEX]);
    if (aa.length == 10) {
        dt1 = aa.substr(6,4)+aa.substr(3,2)+aa.substr(0,2);
    } else {
        yr = aa.substr(6,2);
        if (parseInt(yr) < 50) { yr = '20'+yr; } else { yr = '19'+yr; }
        dt1 = yr+aa.substr(3,2)+aa.substr(0,2);
    }
    if (bb.length == 10) {
        dt2 = bb.substr(6,4)+bb.substr(3,2)+bb.substr(0,2);
    } else {
        yr = bb.substr(6,2);
        if (parseInt(yr) < 50) { yr = '20'+yr; } else { yr = '19'+yr; }
        dt2 = yr+bb.substr(3,2)+bb.substr(0,2);
    }
    if (dt1==dt2) return 0;
    if (dt1<dt2) return -1;
    return 1;
}

function ts_sort_currency(a,b) { 
    aa = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]).replace(/[^0-9.]/g,'');
    bb = ts_getInnerText(b.cells[SORT_COLUMN_INDEX]).replace(/[^0-9.]/g,'');
    return parseFloat(aa) - parseFloat(bb);
}

function ts_sort_numeric(a,b) { 
    aa = parseFloat(ts_getInnerText(a.cells[SORT_COLUMN_INDEX]));
    if (isNaN(aa)) aa = 0;
    bb = parseFloat(ts_getInnerText(b.cells[SORT_COLUMN_INDEX])); 
    if (isNaN(bb)) bb = 0;
    return aa-bb;
}

function ts_sort_caseinsensitive(a,b) {
    aa = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]).toLowerCase();
    bb = ts_getInnerText(b.cells[SORT_COLUMN_INDEX]).toLowerCase();
    if (aa==bb) return 0;
    if (aa<bb) return -1;
    return 1;
}

function ts_sort_default(a,b) {
    aa = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]);
    bb = ts_getInnerText(b.cells[SORT_COLUMN_INDEX]);
    if (aa==bb) return 0;
    if (aa<bb) return -1;
    return 1;
}


function addEvent(elm, evType, fn, useCapture)
// addEvent and removeEvent
// cross-browser event handling for IE5+,  NS6 and Mozilla
// By Scott Andrew
{
  if (elm.addEventListener){
    elm.addEventListener(evType, fn, useCapture);
    return true;
  } else if (elm.attachEvent){
    var r = elm.attachEvent("on"+evType, fn);
    return r;
  } else {
    alert("Handler could not be removed");
  }
} 

function alternateRowColors() {
	var className = 'sortable';
	var rowcolor = '#dddddd';
	var defaultrowcolor = '#ffffff';
	var rows, arow;
	var tables = document.getElementsByTagName("table");
	var rowCount = 0;
	for(var i=0;i<tables.length;i++) {
		//dump(tables.item(i).className + " " + tables.item(i).nodeName + "\n");
		if(tables.item(i).className == className) {
			atable = tables.item(i);
			rows = atable.getElementsByTagName("tr");
			for(var j=0;j<rows.length;j++) {
				arow = rows.item(j);
				if(arow.nodeName == "TR") {
					if(rowCount % 2) {
						arow.style.backgroundColor = rowcolor;
					} else {
						// default case
						arow.style.backgroundColor = defaultrowcolor;
					}
					rowCount++;
				}
			}
			rowCount = 0;
		}
	}
}

function ts_get_cookie(table_id)
{
  var cookie="; "+document.cookie.toString()+"; "
	var searchString = "; ts_" + table_id + "=";
	var start=cookie.indexOf(searchString);
	var slut;
	var cookieArray = cookie.split(";");

	if(start>-1)
	{
		slut = cookie.indexOf("; ",start+searchString.length);
		tsCookie = cookie.substring(start+searchString.length,slut);
		
		return tsCookie;
		/*
		tsCookie = tsCookie.split("%2C");

		if(tsCookie.length > 0)
		{
			return tsCookie[0];
		}
		*/
	}
}


function ts_get_cookie_index(table_id)
{
  var cvalue = ts_get_cookie(table_id);
  if(cvalue)
  {
    cvalue = cvalue.split("%2C");
    if(cvalue.length > 0)
  	{
  	  return cvalue[0];
    }
  }
}

function ts_get_cookie_direction(table_id)
{
  var cvalue = ts_get_cookie(table_id);
  if(cvalue)
  {
    cvalue = cvalue.split("%2C");
    if(cvalue.length > 0)
  	{
  	  return cvalue[1];
    }
  }
}

function ts_set_cookie(table_id, cvalue)
{
  var d = new Date();
  d.setDate(d.getDate() + 365);
  var cookie_string = "ts_" + table_id + "=" + escape(cvalue);
  cookie_string += "; expires=" + d.toGMTString();
 	document.cookie = cookie_string;
}