/**
 * JavaScript file that, when included on your page, gives you sorting of tables
 * for free.
 *
 * This is open-source code from kryogenix.org http://www.kryogenix.org/code/browser/sorttable/
 *
 *
 * Changes by Nick:
 *  ??/??/?? Added check for 'not-sortable' class. If set, then that particular
 *           column won't have sorting applied.
 *  12/19/05 Modified various functions to use DOM events instead of innerHTML,
 *           allowing this script to still work when delivered with the
 *           application/xhtml+xml mime type. Also removed html entities and
 *           replaced them with unicode numeric references.
 */

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
    var iCnt = 0;
    for (var i=0;i<firstRow.cells.length;i++) {
        var cell = firstRow.cells[i];
        var txt = ts_getInnerText(cell);
				if ((' ' + cell.className + ' ').indexOf('not-sortable') == -1)
				{
					//var oLink = document.createElement( 'a' );
					//oLink.setAttribute( 'href', '#' );
					//oLink.setAttribute( 'class', 'sortheader' );
					//oLink.onclick = function()
					//{
					//	ts_resortTable( this );
					//	return false;
					//};
					//oLink.appendChild( document.createTextNode( txt ) );
					//var oArrowSpan = document.createElement( 'span' );
					//oArrowSpan.setAttribute( 'class', 'sortarrow' );
					//oArrowSpan.appendChild( document.createTextNode( '\u00a0\u00a0\u00a0' ) );
					//oLink.appendChild( oArrowSpan );
					//cell.replaceChild( oLink, cell.firstChild );
					sHTML = '<div>';
					sHTML = sHTML + '<div>';
					sHTML = sHTML + '<span>' + aMisc[iCnt] + '</span>';
					sHTML = sHTML + '<a href="#" class="up-btn" onclick="ts_resortTable(this, \'up\');return false;"><img src="../media/images/arrow-up.gif" border="0" /></a>';
					sHTML = sHTML + '<a href="#" class="down-btn" onclick="ts_resortTable(this, \'down\');return false;"><img src="../media/images/arrow-down.gif" border="0" /></a>';
					sHTML = sHTML + '</div>';
					sHTML = sHTML + '</div>';
					cell.innerHTML = sHTML;
					++iCnt;

					//sHTML = sHTML + '<a href="#" class="sortheader" onclick="ts_resortTable(this);return false;">'+txt+'<span class="sortarrow">&#160;&#160;&#160;</span></a>';
					//cell.innerHTML = sHTML;
				}
    }
}

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, sDirection) {
    var div1 = lnk.parentNode;
    var div2 = div1.parentNode;
    var td = div2.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]);
    itm = itm.replace(/^\s*|\s*$/g,"");
    sortfn = ts_sort_caseinsensitive;
    if (itm.match(/^\d\d[\/-]\d\d[\/-]\d\d\d\d$/)) 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 (sDirection == 'down') {
        newRows = newRows.reverse();
    }
    
    // We appendChild rows that already exist to the tbody, so it moves them rather than creating new ones
    // don't do sortbottom rows
    var sClassName = '';
    for (i=0;i<newRows.length;i++) 
    {
    	if (!newRows[i].className || (newRows[i].className && (newRows[i].className.indexOf('sortbottom') == -1)))
    	{
    		if (sClassName == '')
    		{
    			sClassName = 'alt';
    		}
    		else
    		{
    			sClassName = '';
    		}
    		newRows[i].className = sClassName;
    		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))
    	{
    		if (sClassName == '')
    		{
    			sClassName = 'alt';
    		}
    		else
    		{
    			sClassName = '';
    		}
    		newRows[i].className = 'sortbottom ' + sClassName;
    		table.tBodies[0].appendChild(newRows[i]);
    	}
    }
}

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 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");
  }
}