/*
  The original code (before I improved it) for this wonderful table sorting utility came from:
  http://www.kryogenix.org/code/browser/sorttable/
*/

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);
        // If the cell is marked to be initially sorted, then mark it with the appropriate arrow.
	    var initSortDirUp = cell.className.indexOf("sortDirUp") >= 0;
	    var initSortDirDown = cell.className.indexOf("sortDirDown") >= 0;
	    
		if(initSortDirUp || initSortDirDown) {
		    var theSortDir;
		    var theSortArrow;
			if(initSortDirUp) {
			    theSortDir = 'up';
			    theSortArrow = '&uarr;';
			} else {
			    theSortDir = 'down';
			    theSortArrow = '&darr;';
			}
	        cell.innerHTML = '<a href="#" class="sortheader" onclick="ts_resortTable(this);return false;">'+txt+'<span class="sortarrow" sortdir='+ theSortDir +'>&nbsp;&nbsp;'+ theSortArrow +'</span></a>';
	    } else {
	        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 = "";

	if (el.childNodes[0]) {
		if(el.childNodes[0].value) {return el.childNodes[0].value;}
	}
	
	var cs = el.childNodes;
	var l = cs.length;
	for (var i = 0; i < l; i++) {
		// INPUT text field (ignore hidden fields)
		if(cs[i].value && cs[i].type!='hidden') {
			return cs[i].value;
		}
		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
    var tRows = table.rows;
    if (tRows.length <= 1) return;
    var itm;
	// Check all cells in the column, starting with the 2nd row (row=1 so we skip header)
	// It goes until it hits a non-null cell and then uses the value in that cell to determine the column type.
    for(var rowIx=1; rowIx<tRows.length; ++rowIx) {
    	var rCells = tRows[rowIx].cells;
    	if(rCells!=null && rCells[column]) {
		    itm = ts_getInnerText(rCells[column]);
		    if(itm!=null && itm!='')
		    	break;
    	}
    }
    // This is for columns with nothing in them.
//    if(itm==null)
//    	item = '';
    
    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 = '&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 markWithArrow(span,sortdir) {

	var ARROW;
    if (sortdir == 'up') {
        ARROW = '&nbsp;&nbsp;&uarr;';
        span.setAttribute('sortdir','up');
    } else {
        ARROW = '&nbsp;&nbsp;&darr;';
        span.setAttribute('sortdir','down');
    }
    
/*
    // 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(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);
}

// This sorts numeric data and case insensitive string data all together such that numerical data is sorted
// numerically even when mixed into a list of non-numeric strings.
function ts_sort_caseinsensitive(a,b) {
	if(!a.cells) {
		if(!b.cells)
			return 0;
		return 1;
	} else {
		if(!b.cells)
			return -1;
	}
	
    var aa = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]);
    var bb = ts_getInnerText(b.cells[SORT_COLUMN_INDEX]);

	if(!aa) {
		if(!bb)
			return 0;
		return 1;
	} else {
		if(!bb)
			return -1;
	}

	if(ts_isNumeric(aa)) {
		if(ts_isNumeric(bb)) {
			// both are numeric
		    aa = parseFloat(aa);
		    bb = parseFloat(bb); 
		    return aa-bb;
		} else {
			return -1;
		}
	} else {
		if(ts_isNumeric(bb)) {
			return 1;
		} else {
			// neither is numeric
			aa = aa.toLowerCase();
			bb = bb.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_isNumeric(itm) {
    return itm.match(/^[\d\.]+$/);
}

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");
  }
}