//alert('sorttable loaded')
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];
//	alert(thisTbl.id)
        if (((' '+thisTbl.className+' ').indexOf("sortable") != -1) && (thisTbl.id)) {
            //initTable(thisTbl.id);
            ts_makeSortable(thisTbl);
        }
    }
//alert('checking for presortable table ...')
  presort=xGetElementById('presort');
//alert('presort ? '+presort.value)
 if (presort != null) { if (presort.value == 'true') {
    tblid=xGetElementById('sorttableid');
    columno=xGetElementById('sortcolumno');
    sortdir=xGetElementById('presortdir');
//      alert(presort.id+' = '+presort.value+' for '+tblid.value+' '+columno.name+' '+columno.value)
    ts_resortSpecified(tblid.value,columno.value,sortdir.value)}}
}

function ts_makeSortable(table) {
    if (table.rows && table.rows.length > 0) {
      var firstRow = table.rows[0];
//alert(firstRow.cells.length+' columns')
    }
    if (!firstRow)  { return;}
//        headers=firstRow.getElementsByTagName("th"); 
	headers=xGetElementsByTagName("th",firstRow)  //if TH tags used in first row, make only those columns sortable
//alert(headers.length+' th headers');
if (headers.length == 0) {headers = firstRow.cells;}   // otherwise, assume all columns are sortable
//alert(headers.length+' header cells')
     for (var i=0;i<headers.length;i++) {
        var cell = headers[i];
        var txt = ts_getInnerText(cell);
//  alert(xInnerHtml(cell)+' '+cell.attributes.length+' '+cell.TagName)
        cell.innerHTML = '<a href="#" class="sortheader" onclick="ts_resortTable(this);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_resortSpecified(tblid,columnno,sortdir) {
   mytable=xGetElementById(tblid);
   firstRow=mytable.rows[0];
//alert('Called ts_resortSpecified \n'+tblid+' '+columnno+' '+xInnerHtml(firstRow.cells[columnno]))
   lnks=xGetElementsByTagName("a",firstRow.cells[columnno])
   mylnk = lnks[0];
//   alert('Presorting table '+tblid+' Column '+columnno+' '+sortdir+' link name '+mylnk+' ')

   ts_resortTable(mylnk,sortdir)
}
function ts_resortTable(lnk,sortdir) {
    // 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);  // alert('lnk = '+lnk+' span = '+span+' : '+spantext)
    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]);
var sortspans = new Array()
sortspans=xGetElementsByClassName('sorthidden',table.rows[1].cells[column],'span')
//alert(xInnerHtml(sortspans[0]))
if (sortspans.length == 1) {itm = xInnerHtml(sortspans[0]) }  
sortspans=xGetElementsByClassName('sortspan',table.rows[1].cells[column],'span')
if (sortspans.length == 1) {itm = xInnerHtml(sortspans[0]) }
if (((td.className+' ').indexOf("date") != -1) && (table.id)) {
    sortfn = ts_sort_date;
    sorttype='Date';
}
else { 
    sortfn = ts_sort_caseinsensitive;
    var sorttype = "Case sensitive Text";
      if (itm.match(/^\d\d[\/-]\d\d[\/-]\d\d\d\d$/)) {sortfn = ts_sort_date; sorttype = 'Date';}
      if (itm.match(/^\d+[\/-]\d+[\/-](\d\d)+$/)) { sortfn = ts_sort_date; sorttype='Date';}
      if (itm.match(/^\d\d[\/-]\d\d[\/-]\d\d$/)) { sortfn = ts_sort_date; sorttype='Date';}
      if (itm.match(/^[£$]/)) { sortfn = ts_sort_currency; sorttype='Currency';}
      if (itm.match(/^[\d\.]+$/)) { sortfn = ts_sort_numeric; sorttype='Numeric';}
}


////        if (sortspans.length)
//    alert('Sort Type: '+sorttype+' column-index: '+column+' Content: |'+itm+'|+sortspan: '+sortspans.length);
    SORT_COLUMN_INDEX = column;
    var firstRow = new Array();
    var newRows = new Array(); 
    lastrownum=table.rows.length-1;
    endheaders=xGetElementsByTagName("th",table.rows[lastrownum])    //check weather last row is header 
    if (endheaders.length > 0){
       var lastRow = new Array();
       lastcount=1; 
//       alert('Row numer '+lastrownum+' contains '+endheaders.length+' headers '+table.rows.length)
       lastRow[0] = table.rows[lastrownum];
    }
    else {lastcount=0}
//    alert('lastcount:'+lastcount+' '+lastRow[0]+' '+xInnerHtml(lastRow[0]))
    for (i=0;i<table.rows[0].length;i++) { firstRow[i] = table.rows[0][i]; }
    for (j=1;j<table.rows.length-lastcount;j++) { newRows[j-1] = table.rows[j]; }

    newRows.sort(sortfn);
   
    if (sortdir) {span.setAttribute('sortdir',sortdir)} 
    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]);}

if (lastRow) {table.tBodies[0].appendChild(lastRow[0])}
    
    // 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(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_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 ts_sort_hidden(a,b) {
    aa = parseFloat(ts_getInnerText(a.cells[SORT_COLUMN_INDEX]))
}


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");
  }
}