//see documentation for license information
addEvent(window, "load", sortables_init);

var SORT_COLUMN_INDEX;

function sortables_init() {
 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)) {
   ts_makeSortable(thisTbl);
  }
 }
}

function ts_makeSortable(table) {
 if (table.rows && table.rows.length > 0) {
  var firstRow = table.rows[0];
 }
 if (!firstRow) return;
 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"></span></a>';
 }
}

function ts_getInnerText(el) {
 if (typeof el == "string") return el;
 if (typeof el == "undefined") { return el };
 if (el.innerText) return el.innerText;
 var str = "";
 var cs = el.childNodes;
 var l = cs.length;
 for (var i = 0; i < l; i++) {
  switch (cs[i].nodeType) {
   case 1:
    str += ts_getInnerText(cs[i]);
    break;
   case 3:
    str += cs[i].nodeValue;
	 break;
  }
 }
 return str;
}
function ts_resortTable(lnk,clid) {
 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');

 if (table.rows.length <= 1) return;
 var itm = ts_getInnerText(table.rows[1].cells[column]);
 sortfn = ts_sort_caseinsensitive;
 if (itm.match(/^[A-Z]\d/)) sortfn = ts_sort_carno;
 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') {
 newRows.reverse();
 span.setAttribute('sortdir','up');
} else {
span.setAttribute('sortdir','down');
};
 ARROW = '';
 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]);}
 for (i=0;i<newRows.length;i++) { if (newRows[i].className && (newRows[i].className.indexOf('sortbottom') != -1)) table.tBodies[0].appendChild(newRows[i]);}
 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")) {
    allspans[ci].innerHTML = '';
   }
  }
 }
 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(0,2)+aa.substr(3,2);
 } else {
  yr = aa.substr(6,2);
  if (parseInt(yr) < 50) { yr = '20'+yr; } else { yr = '19'+yr; }
  dt1 = yr+aa.substr(0,2)+aa.substr(3,2);
 }
 if (bb.length == 10) {
  dt2 = bb.substr(6,4)+bb.substr(0,2)+bb.substr(3,2);
 } else {
  yr = bb.substr(6,2);
  if (parseInt(yr) < 50) { yr = '20'+yr; } else { yr = '19'+yr; }
  dt2 = yr+bb.substr(0,2)+bb.substr(3,2);
 }
 if (dt1==dt2) return 0;
 if (dt1<dt2) return -1;
 return 1;
}

function ts_sort_carno(a,b) {
temp = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]);
aa = temp.substring(0,1);
aaa = temp.substring(1, temp.length);
if (isNaN(aaa)) aaa = 0; 
temp = ts_getInnerText(b.cells[SORT_COLUMN_INDEX]);
bb = temp.substring(0,1);
bbb = temp.substring(1, temp.length);
if (isNaN(bbb)) bbb = 0;
if (aa==bb) return aaa-bbb;
if (aa<bb) 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){
 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");
 }
}