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)
    {
      if(!thisTbl.id)
      {
        thisTbl.id = "TS" + ti;
      }

      ts_makeSortable(thisTbl);
    }
  }
}

function ts_makeSortable(table)
{
  if (table.rows && table.rows.length > 0) {
      var firstRow = table.rows[0];
  }
  if (!firstRow) return;
  var sortBy = false;
  
  // 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);
    if((' '+cell.className+' ').indexOf(' nosort ')==-1 && txt!="")
    {
      cell.innerHTML = '<a href="#" class="sortheader" onclick="ts_resortTable(this,'+i+');return false;" id="sortheader'+i+'">'+txt+'<span class="sortarrow">&nbsp;&nbsp;&nbsp;</span></a>';
      if((' '+cell.className+' ').indexOf(' sortby ')!=-1)
      {
        var lnk = document.getElementById('sortheader'+i);
        var clid = i;
        sortBy = true;
      }
    }
  }
  
  if(sortBy)
  {
    ts_resortTable(lnk,clid);
  }
}

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 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;
    
    sortfn = ts_sort_caseinsensitive;

    if((' '+table.rows[0].cells[column].className+' ').indexOf(' sortnumeric ')!=-1)
      sortfn = ts_sort_numeric;
    else if((' '+table.rows[0].cells[column].className+' ').indexOf(' sortdate ')!=-1)
      sortfn = ts_sort_date;
    else if((' '+table.rows[0].cells[column].className+' ').indexOf(' sortcurrency ')!=-1)
      sortfn = ts_sort_currency;
    else if((' '+table.rows[0].cells[column].className+' ').indexOf(' sortalphabetical ')!=-1)
      sortfn = ts_sort_caseinsensitive;
    else
    {
      var itm = ts_getInnerText(table.rows[1].cells[column]); 
      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(/^[£$€]/)) sortfn = ts_sort_currency;
      if (itm.replace(/:/g,'.').replace(/%/g,'').match(/^[\d\.]+$/)) 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]; }

    if(sortfn==ts_sort_numeric)
      newRows.sort(ts_sort_caseinsensitive);

    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)))
      {
        if((' '+newRows[i].className+' ').indexOf(' odd ')!=-1 || (' '+newRows[i].className+' ').indexOf(' even ')!=-1)
        {
          newRows[i].className = newRows[i].className.replace("odd","");
          newRows[i].className = newRows[i].className.replace("even","");
        }
        
        newRows[i].className += ((i%2==0) ? "odd" : "even");
        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)
{
  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,'');

  if (!aa) aa = 0;
  if (!bb) bb = 0;
  return parseFloat(aa) - parseFloat(bb);
}

function ts_parseFloat(number)
{
 
  var num = parseFloat(number.replace(/:/g,'.'));
  if(!isNaN(num))
  {
    return num;
  }
  return number;
}

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