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);
    }
  }
}


function ts_makeSortable(table)
{
  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, '+i+');return false;">' + 
    txt+'<span class="sortarrow">&nbsp;&nbsp;&nbsp;</span></a>';
  }
}


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,clid)
{
  // 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 = clid || 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');
  } else {
      ARROW = '&nbsp;&nbsp;&darr;';
      span.setAttribute('sortdir','down');
  }
  
  // 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;
}


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");
  }
}