//
// Call sortables_init() on load
//
addEvent(window, "load", sortables_init);

var SORT_COLUMN_INDEX;
if (true) {
    var props = ' border=0 hspace=0 width=9 height=9'
    var ARROW_NONE = '<img' + props + ' src="/img/new/sort_none.gif">';
    var ARROW_UP   = '<img' + props + ' src="/img/new/sort_desc.gif">';
    var ARROW_DOWN = '<img' + props + ' src="/img/new/sort_asc.gif">';
}
var direction = 1;

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)) {
            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">'
                       + ARROW_NONE
                       + '</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]);
    var sortfn = ts_sort_caseinsensitive;
    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]; }

    if (span.getAttribute("sortdir") == 'down') {
        ARROW = ARROW_UP;
        // newRows.reverse();
        span.setAttribute('sortdir','up');
        direction = +1;
    } else {
        ARROW = ARROW_DOWN;
        span.setAttribute('sortdir','down');
        direction = -1;
    }

    //
    // Sort the table rows
    //
    newRows.sort(sortfn);

    // 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 = ARROW_NONE;
            }
        }
    }

    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_numeric(a,b)
{ 
    var aa = parseFloat(ts_getInnerText(a.cells[SORT_COLUMN_INDEX]));
    if (isNaN(aa)) aa = 0;
    var bb = parseFloat(ts_getInnerText(b.cells[SORT_COLUMN_INDEX])); 
    if (isNaN(bb)) bb = 0;
    if (aa < bb) return -1 * direction;
    if (aa > bb) return +1 * direction;
    return 0;
}

function ts_sort_caseinsensitive(a,b)
{
    var aa = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]).toLowerCase();
    var bb = ts_getInnerText(b.cells[SORT_COLUMN_INDEX]).toLowerCase();
    if (aa < bb) return -1 * direction;
    if (aa > bb) return +1 * direction;
    return 0;
}

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 {
        //
        // Happens on Mac systems
        //
        // alert("Handler could not be removed");
    }
}