/*
*	This script was created by Stuart Langridge
* 	http://www.kryogenix.org/code/browser/sorttable/
*		tweaked by Shawn Hill - 11/21/2003
*/

// variables

// Set this varible to true if dates appear mm dd yyyy 
var monthBeforeDay = true;
// Every two digit year before this number will evaluated to this century, all after to last century
// e.g. if twoDigitCutoffYear = 50 49 will become 2049 and 51 will become 1951
var twoDigitCutoffYear = 50;

// css class names -- correspond to classes in sort.css
var tableClass = 'sortable'
var headerOver = 'cellover'
var headerDesc = 'sortdesc'
var headerAsc = 'sortasc'
var bottomRow = 'sortbottom'

// preload background images if you like:
p1 = new Image()
p1.src = 'asc.gif'
p2 = new Image()
p2.src = 'desc.gif'

window.onload = sortables_init

var SORT_COLUMN_INDEX = -1;

function sortables_init() {
    // Find all tables with class tableClass and make them sortable
    if (!document.getElementsByTagName) return;
    tbls = document.getElementsByTagName('table');
    for (ti=0;ti<tbls.length;ti++) {
        if (tbls[ti].className==tableClass) ts_makeSortable(tbls[ti])
    }
}

function ts_makeSortable(table) {
    if (table.rows && table.rows.length > 0) {
        var firstRow = table.rows[0];
    }
    if (!firstRow) return;
    table.sortColumn = -1
    // 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];
				cell.table = table
				cell.onclick=function(){			
					ts_resortTable(this)
				}
				cell.onmouseover=function(){
					if(this.cellIndex!=this.table.sortColumn)
						this.className=headerOver
				}
				cell.onmouseout=function(){
					if(this.cellIndex!=this.table.sortColumn)
						this.className=''
				}		
	}
}

function ts_resortTable(td) {
    var column = td.cellIndex;
    var table = getParent(td,'TABLE');
    if (table.rows.length <= 1) return;
	
	// if this is the same column, switch sort direction
	if(!td.sortfn) td.sortdesc = true
	if(table.sortColumn == column) td.sortdesc = !td.sortdesc  
	
    // set the selected sort th class of the otherld headers to ''
	if( table.sortColumn >=0 ) table.rows[0].cells[table.sortColumn].className = '';
	
		table.sortColumn = 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]; }
		
		if(!td.sortfn){
			var itm = ts_getInnerText(table.rows[1].cells[column]); 
			td.sortfn = ts_sort_caseinsensitive;
			if (itm.match(/\d{1,2}[\/-]\d{1,2}[\/-]\d{2,4}/)) td.sortfn = ts_sort_date;
			else if (itm.match(/[£$]/)) td.sortfn = ts_sort_currency;
			else if (!(isNaN(itm))) td.sortfn = ts_sort_numeric;
		}
		SORT_COLUMN_INDEX = table.sortColumn
    newRows.sort(td.sortfn);

    if (td.sortdesc) {
        td.className=headerDesc
    } else {
        td.className=headerAsc
        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
    for (i=0;i<newRows.length;i++) { if (!newRows[i].className || (newRows[i].className && (newRows[i].className.indexOf(bottomRow) == -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(bottomRow) != -1)) table.tBodies[0].appendChild(newRows[i]);}
}

function ts_getInnerText(el) {
	if (typeof el == 'string') return el;
	if (typeof el == 'undefined') { return '' };
	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 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) {
    aa = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]);
    bb = ts_getInnerText(b.cells[SORT_COLUMN_INDEX]);
		del = ((aa.indexOf('/')!=-1)?'/':'-');
		dA = aa.split(del)
		dB = bb.split(del)
		dA[2]=convertYear(dA[2], twoDigitCutoffYear)
		dB[2]=convertYear(dB[2], twoDigitCutoffYear)
		
		if(monthBeforeDay){
			dt1 = new Date(dA[2],dA[0],dA[1]);
			dt2 = new Date(dB[2],dB[0],dB[1]);
		}
		else{
			dt1 = new Date(dA[2],dA[1],dA[0]);
			dt2 = new Date(dB[2],dB[1],dB[0]);
		}	
		if (dt1==dt2) return 0;
    if (dt1<dt2) return -1;
    return 1;
}

function convertYear(yr, cutOffYear){
	yr = parseInt(yr);
	thisCentury = (new Date()).getFullYear()/100;
	
	if(yr < cutOffYear)	return thisCentury*100+yr;
	else if( yr < 100 ) return (thisCentury - 1)*100+yr;
	if( yr == 100 )return thisCentury*100;
	return yr;
}

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;
}