// sort.js
// called from every page requiring sorting

var image_path = "";
var image_up = "arrow-up.gif";
var image_down = "arrow-down.gif";
var image_none = "arrow-none.gif";

addEvent(window, "load", sortables_init);

var SORT_COLUMN_INDEX;

function sortables_init() {
	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)) {
			ts_makeSortable(thisTbl);
		}
	}
}

function ts_makeSortable(table) {
	if (table.rows && table.rows.length > 0) {
		var firstRow = table.rows[0];
	}
	if (!firstRow) return;
	for (var i=0; i<firstRow.cells.length; i++) {
		var cell = firstRow.cells[i];
		var txt = ts_getInnerText(cell);
		if (cell.className != "unsortable" && cell.className.indexOf("unsortable") == -1) {
			cell.innerHTML = '<a href="javascript:void(0);" class="sortheader" onclick="ts_resortTable(this);return false;">' + txt + '<span class="sortarrow"></span></a>';//&nbsp;&#8595;&#8593;
		}
	}
	alternate(table);
}

function ts_getInnerText(el) {
	if (typeof el == "string") return el;
	if (typeof el == "undefined") { return el };
	if (el.innerText) return el.innerText;
	var str = "";
	var cs = el.childNodes;
	var l = cs.length;
	for (var i = 0; i < l; i++) {
		switch (cs[i].nodeType) {
			case 1:
				str += ts_getInnerText(cs[i]);
				break;
			case 3:
				str += cs[i].nodeValue;
				break;
		}
	}
  return str;
}

function ts_resortTable(lnk) {
	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');

	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$/)) sortfn = ts_sort_date;
	if (itm.match(/^\d\d[\/-]\d\d[\/-]\d\d$/)) 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;&#8593;&nbsp;
		newRows.reverse();
		span.setAttribute('sortdir','up');
	} else {
		ARROW = '';//&nbsp;&#8595;&nbsp;
		span.setAttribute('sortdir','down');
	}

	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]);
		}
	}

	for (i=0; i<newRows.length; i++) {
		if (newRows[i].className && (newRows[i].className.indexOf('sortbottom') != -1))
		table.tBodies[0].appendChild(newRows[i]);
	}

	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")) {
				allspans[ci].innerHTML = '';//&nbsp;&nbsp;&nbsp; // &nbsp;&Xi
			}
		}
	}
	span.innerHTML = ARROW;
	alternate(table);
}

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]);
	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) {
	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");
	}
}

function replace(s, t, u) {
	i = s.indexOf(t);
	r = "";
	if (i == -1) return s;
	r += s.substring(0,i) + u;
	if ( i + t.length < s.length)
		r += replace(s.substring(i + t.length, s.length), t, u);
	return r;
}

function alternate(table) {
	var tableBodies = table.getElementsByTagName("tbody");
	for (var i = 0; i < tableBodies.length; i++) {
		var tableRows = tableBodies[i].getElementsByTagName("tr");
		for (var j = 1; j < tableRows.length; j++) {
			if ( (j % 2) == 0  ) {
				if (tableRows[j].className == 'odd' || !(tableRows[j].className.indexOf('odd') == -1) ) {
					tableRows[j].className = replace(tableRows[j].className, 'odd', 'even');
				} else {
					tableRows[j].className += " even";
				}
			} else {
				if (tableRows[j].className == 'even' || !(tableRows[j].className.indexOf('even') == -1) ) {
					tableRows[j].className = replace(tableRows[j].className, 'even', 'odd');
				}
				tableRows[j].className += " odd";
			}
		}
	}
}