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 class="sortheader" onclick="ts_resortTable(this);return false;">'+txt+'<div class="sortarrow"></div></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) {

  // get the span
  var span;
  for (var ci=0;ci<lnk.childNodes.length;ci++) {

    if (lnk.childNodes[ci].tagName && lnk.childNodes[ci].tagName.toLowerCase() == 'div') 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 = '&#9650;';
    newRows.reverse();
    span.setAttribute('sortdir','up');
  }

  else {

    ARROW = '&#9660;';
    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("div");
  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 = '';

      }

    }

  }

  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");
  }
}