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);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) {
    // 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 = 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$/)) sortfn = ts_sort_date;
    else if (itm.match(/^\d\d[\/-]\d\d[\/-]\d\d$/)) sortfn = ts_sort_date;
    else if (itm.match(/^[£$]/)) { sortfn = ts_sort_currency; }
    else if (itm.match(/^\d+\.\d+\.\d+\.\d+$/)) sortfn = ts_sort_ip;
    else if (itm.match(/^[\d\.]+$/)) sortfn = ts_sort_numeric;
    else if (itm.match(/^\d+\/\d+\/\d\d\d\d \d+:\d\d [AP]M$/)) sortfn = ts_sort_date_time;
    else if (itm.match(/^\d+\/\d+\/\d\d\d\d \d+:\d\d:\d\d [AP]M$/)) sortfn = ts_sort_date_time;
    else if (itm.match(/^([\d\.]+[dhms](, )?)+$/)) sortfn = ts_sort_uptime;
    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_ip(a,b) {
	// [xx]x.[xx]x.[xx]x.[xx]x
    aa = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]);
    bb = ts_getInnerText(b.cells[SORT_COLUMN_INDEX]);
    aaipv = aa.split(".");
    bbipv = bb.split(".");
    aaip = (aaipv[0]*1000000000)+(aaipv[1]*1000000)+(aaipv[2]*1000)+(aaipv[3]*1);
    bbip = (bbipv[0]*1000000000)+(bbipv[1]*1000000)+(bbipv[2]*1000)+(bbipv[3]*1);
    if(aaip>bbip) return 1;
    if(aaip<bbip) return -1;
    return 0;
}

function ts_sort_uptime(a,b) {
    // [[xd, ]xh, ]xm, ]xx.xxxs
    aa = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]);
    bb = ts_getInnerText(b.cells[SORT_COLUMN_INDEX]);
    aauv = aa.split(",");
    bbuv = bb.split(",");
    if(aauv.length > bbuv.length) return 1;
    if(aauv.length < bbuv.length) return -1;
    for(i=0;i<aauv.length;i++) {
      // strip off trailing time marker
      if((aauv[i].substring(0,aauv[i].length-1)*1) >
	 (bbuv[i].substring(0,bbuv[i].length-1)*1)) return 1;
      if((aauv[i].substring(0,aauv[i].length-1)*1) <
	 (bbuv[i].substring(0,bbuv[i].length-1)*1)) return -1;
    }
    return 0;
}

function ts_sort_date_time(a,b) {
    // (m)m/(d)d/yyyy (h)h:mm TM
    aa = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]);
    bb = ts_getInnerText(b.cells[SORT_COLUMN_INDEX]);
    if(aa==bb) return 0;
    aadttv = aa.split(" ");
    aadts = aadttv[0];
    aatts = aadttv[1];
    aattv = aatts.split(":");
    if(aattv.length>2) {
      aatt = (aattv[0]*100*100) + (aattv[1]*100) + (aattv[2]*1);
      if(aadttv[2]=="PM") aatt += 12 * 100 * 100;
    } else {
      aatt = (aattv[0]*100) + (aattv[1]*1);
      if(aadttv[2]=="PM") aatt += 12 * 100;
    }
    aadtv = aadts.split("/");
    aadt = (aadtv[2]*10000) + (aadtv[0]*100) + (aadtv[1]*1);
    bbdttv = bb.split(" ");
    bbdts = bbdttv[0];
    bbtts = bbdttv[1];
    bbttv = bbtts.split(":");
    if(bbttv.length>2) {
      bbtt = (bbttv[0]*100*100) + (bbttv[1]*100) + (bbttv[2]*1);
      if(bbdttv[2]=="PM") bbtt += 12 * 100 * 100;
    } else {
      bbtt = (bbttv[0]*100) + (bbttv[1]*1);
      if(bbdttv[2]=="PM") bbtt += 12 * 100;
    }
    bbdtv = bbdts.split("/");
    bbdt = (bbdtv[2]*10000) + (bbdtv[0]*100) + (bbdtv[1]*1);
    if(aadt==bbdt) {
      if(aatt==bbdt) return 0;
      if(aatt>bbdt) return 1;
      return -1;
    } else if (aadt>bbdt)
    { return 1; }
    else // if (aadt<bbdt)
    { return -1; }
}

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");
  }
}